Ring network communication topology structure of power electronic equipment and ring network communication synchronization method

Abstract

The present invention discloses a ring network communication topology structure of a power electronic device and a ring network communication synchronization method, wherein each pair of communication interfaces in a first control and protection host is connected to a first valve group control unit group in a corresponding valve group control unit concentration by a ring network communication, and each pair of communication interfaces in a second control and protection host is connected to a second valve group control unit group in a corresponding valve group control unit concentration by a ring network communication, each pair of communication interfaces in the first valve group control unit in each valve group control unit concentration is connected to at least one power module by a ring network communication connection, and each pair of communication interfaces in the second valve group control unit in each valve group control unit concentration is connected to the at least one power module by a ring network communication connection, or, after selecting one of the two, the two valve group control units in each valve group control unit pair are connected to at least one power module by a ring network communication connection through each pair of communication interfaces.

Description

Technical Field

[0001] The present invention relates to a network-based real-time control system, and in particular to a ring network communication topology structure of a power electronic device and a ring network communication synchronization method. Background Art

[0002] In power electronic equipment control systems based on cascaded multilevel topologies, a three-layer system architecture is typically adopted, consisting of a control and protection host, a valve control sub-machine, and a power sub-module. Therefore, establishing a reliable and efficient communication network is one of the core issues of this system.

[0003] Traditional solutions typically use point-to-point communication to establish communication between the control and protection host and the valve control slaves, and between the valve control slaves and the power modules. For example, if a control and protection host needs to communicate with 16 valve control slaves in a system, the host typically establishes an independent communication link with each slave, ultimately forming 16 independent communication links. The advantage of this approach is that the network structure is simple, and because the host's messages can reach all slaves almost simultaneously, synchronization between the slave systems is easily maintained.

[0004] However, under the traditional point-to-point communication architecture, a large number of independent communication links must be established between the valve control sub-unit and the power module. When the valve control sub-units are stacked in one location and the power module is located in another, a large number of long optical and electrical cables are required for connection, which takes up a lot of space and has been found to have a high failure rate during actual project operation. Moreover, because the valve control sub-unit communicates with the power module through a single communication link, if the optical or electrical cable of this link fails and disconnects, the valve control sub-unit loses connection with the power module, causing the entire system to malfunction, resulting in poor reliability. Summary of the Invention

[0005] Based on the above situation, the main purpose of the present invention is to provide a ring network communication topology structure and a ring network communication synchronization method for power electronic equipment. The host device can connect to more slave devices, or use redundant network ports to reduce the number of slave devices in each ring network, thereby reducing the number of devices affected by network failures. Slave devices can communicate using shorter connecting lines, which greatly reduces the burden of wiring construction and facilitates subsequent maintenance.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A power electronic device ring network communication topology structure includes a first control and protection host, a second control and protection host, multiple valve group control unit sets, and multiple power modules. Each of the valve group control unit sets includes a first valve group control unit group and a second valve group control unit group. Each of the first valve group control unit groups includes multiple first valve group control units, and each of the second valve group control unit groups includes multiple second valve group control units. The number of first valve group control units and second valve group control units in each valve group control unit set is the same, and each of the first valve group control unit and the second valve group control unit in each valve group control unit set forms a valve group control unit pair.

[0008] Each pair of communication interfaces in the first control and protection host corresponds one-to-one to each of the valve group control unit sets, and a pair of communication interfaces and a plurality of first valve group control units in the first valve group control unit group in the corresponding valve group control unit set are connected by ring network communication. Each pair of communication interfaces in the second control and protection host corresponds one-to-one to each of the valve group control unit sets, and a pair of communication interfaces and a plurality of second valve group control units in the second valve group control unit group in the corresponding valve group control unit set are connected by ring network communication.

[0009] Each pair of communication interfaces in the first valve group control unit in each pair of valve group control units is connected to at least one of the power modules using a ring network communication connection, and each pair of communication interfaces in the second valve group control unit in each pair of valve group control units is connected to at least one of the power modules using a ring network communication connection, or,

[0010] The output signals of the first valve group control unit and the second valve group control unit in the valve group control unit pair are selected and then connected to at least one power module through each pair of communication interfaces in a ring network communication connection manner.

[0011] Preferably, the multiple valve group control unit sets are set according to the A phase, B phase and C phase of the alternating current, including a first valve group control unit set, a second valve group control unit set and a third valve group control unit set. The first valve group control unit set controls the A phase power module in the alternating current, the second valve group control unit set controls the B phase power module in the alternating current, and the third valve group control unit set controls the C phase power module in the alternating current.

[0012] Preferably, the first control and protection host and the second control and protection host include multiple pairs of communication interfaces, each pair of communication interfaces includes a first communication interface and a second communication interface, and each first valve group control unit and each second valve group control unit in the plurality of valve group control units include a pair of input end communication interfaces, and the pair of input end communication interfaces includes a first communication interface and a second communication interface;

[0013] Among them, the first control protection host and the multiple first valve group control units in the first valve group control unit group in each valve group control unit set adopt a ring network communication connection: the first communication interface in a pair of communication interfaces of the first control protection host is connected to the first communication interface of the input end of the first first valve group control unit of the first valve group control unit group in the corresponding valve group control unit set, the second communication interface of the input end of the first first valve group control unit is connected to the first communication interface of the input end of the second first valve group control unit, the second communication interface of the input end of the second first valve group control unit is connected to the first communication interface of the input end of the third first valve group control unit, and so on until the last first valve group control unit of the first valve group control unit group in the corresponding valve group control unit set, the second communication interface of the input end of the last first valve group control unit is connected to the second communication interface in a pair of communication interfaces of the first control protection host;

[0014] The second control protection host and the multiple second valve group control units in the second valve group control unit group in each valve group control unit concentration adopt a ring network communication connection: the first communication interface in a pair of communication interfaces of the second control protection host is connected to the first communication interface of the input end of the first second valve group control unit of the second valve group control unit group in the corresponding valve group control unit concentration, the second communication interface at the input end of the first second valve group control unit is connected to the first communication interface at the input end of the second second valve group control unit, the second communication interface at the input end of the second second valve group control unit is connected to the first communication interface at the input end of the third second valve group control unit, and so on until the last second valve group control unit of the second valve group control unit group in the corresponding valve group control unit concentration, the second communication interface at the input end of the last second valve group control unit is connected to the second communication interface in a pair of communication interfaces of the second control protection host.

[0015] Preferably, each of the power modules includes a first pair of communication interfaces and a second pair of communication interfaces, the first pair of communication interfaces includes a first communication interface and a second communication interface, the second pair of communication interfaces includes a third communication interface and a fourth communication interface, each of the first valve group control units in the valve group control unit set includes multiple pairs of output end communication interfaces, and each of the second valve group control units in the valve group control unit set includes multiple pairs of output end communication interfaces;

[0016] Each pair of communication interfaces in the first valve group control unit in the valve group control unit pair is connected to at least one of the power modules in a ring network communication connection manner: the first communication interface at the output end of the first valve group control unit is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, the second communication interface of the second power module is connected to the first communication interface of the third power module, and so on until the last power module, and the second communication interface of the last power module is connected to the second communication interface of the output end of the first valve group control unit;

[0017] Each pair of communication interfaces in the second valve group control unit in the valve group control unit pair is connected to the at least one power module in a ring network communication connection manner: the first communication interface at the output end of the second valve group control unit is connected to the third communication interface of the first power module, the fourth communication interface of the first power module is connected to the third communication interface of the second power module, and the fourth communication interface of the second power module is connected to the third communication interface of the third power module, and so on until the last power module, and the fourth communication interface of the last power module is connected to the second communication interface at the output end of the second valve group control unit.

[0018] Preferably, the output signals of the first valve group control unit and the second valve group control unit in the valve group control unit are selected and connected to at least one of the power modules through each pair of communication interfaces in a ring network communication connection manner:

[0019] The first communication interface in each pair of communication interfaces is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, the second communication interface of the second power module is connected to the first communication interface of the third power module, and so on until the last power module, and the second communication interface of the last power module is connected to the second communication interface of the communication interfaces.

[0020] Preferably, when each pair of communication interfaces in the first valve group control unit in the valve group control unit pair is connected to at least one of the power modules by a ring network communication connection, and each pair of communication interfaces in the second valve group control unit in the valve group control unit pair is connected to at least one of the power modules by a ring network communication connection,

[0021] The valve group control unit simultaneously receives message commands from the first valve group control unit and the second valve group control unit in the valve group control unit pair to the connected power module, and executes the message command from the duty unit;

[0022] The duty unit is: when the message from the first control protection host received by the first valve group control unit contains a system duty command, the first valve group control unit is the duty unit; when the message from the second control protection host received by the second valve group control unit contains a system duty command, the second valve group control unit is the duty unit.

[0023] Preferably, when the output signals of the first valve group control unit and the second valve group control unit in the valve group control unit pair are selected and connected to at least one of the power modules through each pair of communication interfaces in a ring network communication connection mode,

[0024] The power module receives a message command of the duty unit output by the first valve group control unit and the second valve group control unit in the valve group control unit after selecting one of the two;

[0025] The duty unit is: when the message from the first control protection host received by the first valve group control unit contains a system duty command, the first valve group control unit is the duty unit; when the message from the second control protection host received by the second valve group control unit contains a system duty command, the second valve group control unit is the duty unit.

[0026] Preferably, the number of first valve group control units, the number of second valve group control units in each valve group control unit group, and the number of power modules connected to each valve group control unit are set according to the voltage level.

[0027] The present invention also discloses a ring network communication topology structure of a power electronic device, comprising a first control and protection host, a second control and protection host, a plurality of valve group control unit sets and a plurality of power modules, wherein each of the valve group control unit sets comprises a first valve group control unit and a second valve group control unit;

[0028] The first control and protection host is connected to the first valve group control unit in each valve group control unit cluster by a ring network communication connection, and the second control and protection host is connected to the second valve group control unit in each valve group control unit cluster by a ring network communication connection, or the first control and protection host is connected to the first valve group control unit in each valve group control unit cluster by a point-to-point communication connection, and the second control and protection host is connected to the second valve group control unit in each valve group control unit cluster by a point-to-point communication connection;

[0029] Each of the first valve group control unit and the second valve group control unit in the valve group control unit cluster includes at least one pair of output end communication interfaces, each of the first valve group control unit is connected to at least one of the power modules via the output end communication interfaces in a ring network communication connection manner, and each of the second valve group control unit is connected to at least one of the power modules via the output end communication interfaces in a ring network communication connection manner, or,

[0030] The output signals of the first valve group control unit and the second valve group control unit in each valve group control unit set are selected and then connected to at least one power module through each pair of communication interfaces in a ring network communication connection manner.

[0031] Preferably, when the first control and protection host is connected to the first valve group control unit in each valve group control unit cluster by a ring network communication, and the second control and protection host is connected to the second valve group control unit in each valve group control unit cluster by a ring network communication,

[0032] The first control and protection host and the second control and protection host each include a first communication interface and a second communication interface, and the first valve group control unit and the second valve group control unit in the plurality of valve group control units each include a pair of input end communication interfaces, and the input end communication interfaces include a first communication interface and a second communication interface;

[0033] Wherein, the first control protection host and the first valve group control unit in each valve group control unit set adopt a ring network communication connection as follows: the first communication interface of the first control protection host is connected to the first communication interface of the input end of the first valve group control unit in the first valve group control unit set, the second communication interface of the input end of the first valve group control unit in the first valve group control unit set is connected to the first communication interface of the input end of the first valve group control unit in the second valve group control unit set, the second communication interface of the input end of the first valve group control unit in the second valve group control unit set is connected to the first communication interface of the input end of the first valve group control unit in the third valve group control unit set, and so on until the first valve group control unit in the last valve group control unit set, the second communication interface of the input end of the first valve group control unit in the last valve group control unit set is connected to the second communication interface of the first control protection host;

[0034] The second control protection host and the second valve group control unit in each valve group control unit set adopt a ring network communication connection as follows: the first communication interface of the second control protection host is connected to the first communication interface of the input end of the second valve group control unit in the first valve group control unit set, the second communication interface of the input end of the second valve group control unit in the first valve group control unit set is connected to the first communication interface of the input end of the second valve group control unit in the second valve group control unit set, the second communication interface of the input end of the second valve group control unit in the second valve group control unit set is connected to the first communication interface of the input end of the second valve group control unit in the third valve group control unit set, and so on until the second valve group control unit in the last valve group control unit set, the second communication interface of the input end of the second valve group control unit in the last valve group control unit set is connected to the second communication interface of the second control protection host.

[0035] Preferably, when the first control and protection host is connected to the first valve group control unit in each valve group control unit set by point-to-point communication, and the second control and protection host is connected to the second valve group control unit in each valve group control unit set by point-to-point communication,

[0036] The first control and protection host and the second control and protection host each include multiple pairs of communication interfaces, each pair of the communication interfaces corresponds to one of the valve group control units, each pair of the communication interfaces includes a first communication interface and a second communication interface, the first valve group control unit and the second valve group control unit in the multiple valve group control units each include an input end communication interface, and the input end communication interface includes a first communication interface and a second communication interface;

[0037] Wherein, the first control and protection host and the first valve group control unit in each valve group control unit set adopt point-to-point communication connection as follows: the first communication interface in each pair of communication interfaces of the first control and protection host is connected to the first communication interface of the first valve group control unit in the corresponding valve group control unit set, and the second communication interface of the first valve group control unit in the corresponding valve group control unit set is connected to the second communication interface in the corresponding communication interface of the first control and protection host;

[0038] The second control and protection host and the second valve group control unit in each valve group control unit concentration adopt a point-to-point communication connection: the first communication interface in each pair of communication interfaces of the second control and protection host is connected to the first communication interface of the second valve group control unit in the corresponding valve group control unit concentration, and the second communication interface of the second valve group control unit in the corresponding valve group control unit concentration is connected to the second communication interface in the corresponding communication interface of the first control and protection host.

[0039] Preferably, each pair of output end communication interfaces of each first valve group control unit and the second valve group control unit includes a first communication interface and a second communication interface, each power module includes a first pair of communication interfaces and a second pair of communication interfaces, the first pair of communication interfaces includes a first communication interface and a second communication interface, and the second pair of communication interfaces includes a third communication interface and a fourth communication interface.

[0040] Each of the first valve group control units is connected to at least one power module via the output end communication interface in a ring network communication connection manner: the first communication interface at the output end of the first valve group control unit is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, the second communication interface of the second power module is connected to the first communication interface of the third power module, and so on until the last power module, and the second communication interface of the last power module is connected to the second communication interface of the output end of the first valve group control unit;

[0041] Each second valve group control unit is connected to the at least one power module via the output end communication interface using a ring network communication connection: the first communication interface of the output end of the second valve group control unit is connected to the third communication interface of the first power module, the fourth communication interface of the first power module is connected to the third communication interface of the second power module, and the fourth communication interface of the second power module is connected to the third communication interface of the third power module, and so on until the last power module, and the fourth communication interface of the last power module is connected to the second communication interface of the output end of the second valve group control unit.

[0042] Preferably, the valve group control unit centrally selects the output signals of the first valve group control unit and the second valve group control unit, and then connects at least one of the power modules through each pair of communication interfaces in a ring network communication connection manner:

[0043] The first communication interface in each pair of communication interfaces is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, the second communication interface of the second power module is connected to the first communication interface of the third power module, and so on until the last power module, and the second communication interface of the last power module is connected to the second communication interface of the communication interfaces.

[0044] Preferably, when each of the first valve group control units is connected to at least one of the power modules via the output end communication interface in a ring network communication connection manner, and each of the second valve group control units is connected to at least one of the power modules via the output end communication interface in a ring network communication connection manner,

[0045] The power module connected to each valve group control unit simultaneously receives the message commands of the first valve group control unit and the second valve group control unit in the valve group control unit center, and executes the message commands of the duty unit;

[0046] The duty unit is: when the message from the first control protection host received by the first valve group control unit contains a system duty command, the first valve group control unit is the duty unit; when the message from the second control protection host received by the second valve group control unit contains a system duty command, the second valve group control unit is the duty unit.

[0047] Preferably, when the output signals of the first valve group control unit and the second valve group control unit in each valve group control unit are selected and connected to at least one power module through each pair of communication interfaces in a ring network communication connection mode,

[0048] The power module receives a message command of the duty unit output by the first valve group control unit and the second valve group control unit in the valve group control unit after selecting one of the two;

[0049] The duty unit is: when the message from the first control protection host received by the first valve group control unit contains a system duty command, the first valve group control unit is the duty unit; when the message from the second control protection host received by the second valve group control unit contains a system duty command, the second valve group control unit is the duty unit.

[0050] Preferably, the number of power modules connected to each valve group control unit is set according to the voltage level.

[0051] The present invention also discloses a power electronic equipment ring network communication topology structure, comprising a control and protection host, a plurality of valve group control unit groups and a plurality of power modules, each of the valve group control unit groups comprising a plurality of valve group control units,

[0052] The control and protection host includes multiple pairs of communication interfaces, each pair of communication interfaces corresponds to each valve group control unit group one by one, and the control and protection host is connected to the valve group control unit in each corresponding valve group control unit group through each pair of communication interfaces using a ring network communication;

[0053] Each of the valve group control units includes multiple pairs of output end communication interfaces, and each pair of the output end communication interfaces is connected to at least one of the power modules in a ring network communication connection manner.

[0054] Preferably, each pair of communication interfaces of the control and protection host includes a first communication interface and a second communication interface, and each of the valve group control units includes a pair of input end communication interfaces, and the input end communication interfaces include a first communication interface and a second communication interface;

[0055] The control and protection host is connected to the valve group control unit in each corresponding valve group control unit group through each pair of communication interfaces using a ring network communication connection: the first communication interface in a pair of communication interfaces of the control and protection host is connected to the first communication interface of the input end of the first valve group control unit in the corresponding valve group control unit group, the second communication interface at the input end of the first valve group control unit is connected to the first communication interface at the input end of the second valve group control unit, the second communication interface at the input end of the second valve group control unit is connected to the first communication interface at the input end of the third valve group control unit, and so on until the last valve group control unit in the corresponding valve group control unit group, and the second communication interface at the input end of the last valve group control unit is connected to the second communication interface of the control and protection host.

[0056] Preferably, each of the power modules includes a first communication interface and a second communication interface.

[0057] Each pair of output end communication interfaces of each valve group control unit is connected to at least one of the power modules in a ring network communication connection manner: the first communication interface of a pair of communication interfaces at the output end of the valve group control unit is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, and the second communication interface of the second power module is connected to the first communication interface of the third power module, and so on until the last power module, and the second communication interface of the last power module is connected to the second communication interface of a pair of communication interfaces at the output end of the valve group control unit.

[0058] Preferably, the multiple valve group control unit groups are set according to the A phase, B phase and C phase of the alternating current, including a first valve group control unit group, a second valve group control unit group and a third valve group control unit group. The first valve group control unit group controls the A phase power module in the alternating current, the second valve group control unit group controls the B phase power module in the alternating current, and the third valve group control unit group controls the C phase power module in the alternating current.

[0059] The present invention also discloses a power electronic equipment ring network communication topology structure, including a control and protection host, multiple valve group control units and multiple power modules,

[0060] The control and protection host is connected to the multiple valve group control units using a ring network communication connection, or the control and protection host is connected to the multiple valve group control units using a point-to-point communication connection;

[0061] Each of the valve group control units includes multiple pairs of output end communication interfaces, and each pair of the output end communication interfaces is connected to at least one power module in a ring network communication connection manner.

[0062] Preferably, when the control and protection host is connected to the multiple valve group control units using a ring network communication, the control and protection host includes a pair of communication interfaces, the pair of communication interfaces includes a first communication interface and a second communication interface, and each of the valve group control units includes a pair of input-end communication interfaces, the input-end communication interfaces includes a first communication interface and a second communication interface;

[0063] The control and protection host and the multiple valve group control units are connected using a ring network communication connection: the first communication interface of the control and protection host is connected to the first communication interface of the input end of the first valve group control unit, the second communication interface of the input end of the first valve group control unit is connected to the first communication interface of the input end of the second valve group control unit, the second communication interface of the input end of the second valve group control unit is connected to the first communication interface of the input end of the third valve group control unit, and so on until the last valve group control unit among the multiple valve group control units, and the second communication interface of the input end of the last valve group control unit is connected to the second communication interface of the control and protection host.

[0064] Preferably, when the control and protection host is connected to the multiple valve group control units using point-to-point communication, the control and protection host includes multiple pairs of communication interfaces, each pair of communication interfaces includes a first communication interface and a second communication interface, each pair of communication interfaces is point-to-point connected to one valve group control unit, and each valve group control unit includes a pair of input-end communication interfaces, and the pair of input-end communication interfaces includes a first communication interface and a second communication interface.

[0065] The control and protection host and the multiple valve group control units adopt a point-to-point communication connection: the first communication interface in each pair of communication interfaces of the control and protection host is connected to the first communication interface of the corresponding valve group control unit, and the second communication interface of the corresponding valve group control unit is connected to the second communication interface in the corresponding communication interface of the control and protection host.

[0066] Preferably, each of the power modules includes a first communication interface and a second communication interface, and each pair of the output end communication interfaces of each valve group control unit is connected to at least one power module in a ring network communication connection manner: the first communication interface of the output end of the valve group control unit is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, and the second communication interface of the second power module is connected to the first communication interface of the third power module, and so on until the last power module among the multiple power modules, and the second communication interface of the last power module is connected to the second communication interface of the output end of the valve group control unit.

[0067] The present invention also discloses a ring network communication synchronization method, wherein the ring network includes a host and N slaves, where N is at least 1, and the host and the N slaves each include a first communication interface and a second communication interface. The host and the N slaves are sequentially connected through their respective communication interfaces to form a ring network. A message is sent by the first communication interface of the host and transmitted to the second communication interface of the host through the N slaves, thereby forming a first ring network. A message is sent by the second communication interface of the host and transmitted to the first communication interface of the host through the N slaves, thereby forming a second ring network. The method is applied to a ring network communication network in a ring network communication topology structure of a power electronic device according to any one of the present inventions, and the method comprises the steps of:

[0068] S100, calculating the delay compensation value of the slave in the first ring network according to the total delay of the first ring network and the specific delay of each slave receiving the host message through the first ring network, and calculating the delay compensation value of the slave in the second ring network according to the total delay of the second ring network and the specific delay of each slave receiving the host message through the second ring network, wherein the total delay of the first ring network is the delay of the Nth slave receiving the message sent by the host, and the delay of the Nth slave receiving the message sent by the host is equal to the sum of the forwarding delays from the first slave to the N-1th slave, and the total delay of the second ring network is the delay of the first slave receiving the message sent by the host, and the delay of the first slave receiving the message sent by the host is equal to the sum of the forwarding delays from the Nth slave to the second slave;

[0069] S200, when each slave uses the received master message to perform task synchronization, when the master message is transmitted through the first ring network, the synchronization time of the current slave is the time when the current slave receives the master message plus the delay compensation value of the current slave in the first ring network; when the master message is transmitted through the second ring network, the synchronization time of the current slave is the time when the current slave receives the master message plus the delay compensation value of the current slave in the second ring network.

[0070] Preferably, the forwarding delay of the message sent by each slave to the master is the same.

[0071] Preferably, the total delay of the first ring network is T 1 and the total delay of the second ring network T 2 are equal, both are (N-1)*t , t For each slave's forwarding delay, N is the number of slave nodes in the ring network; the delay compensation value of the slave in the first ring network is Δ t 1, the delay compensation value of the slave in the second ring network is Δt 2, Δt 1 =T- ( n -1) *t, Δt 2 =T-(Nn)*t , n For the n The number of the slave.

[0072] Preferably, the total delay of the first ring network is the same as the total delay of the second ring network.

[0073] The present invention further discloses a ring network communication system, which includes the power electronic equipment ring network communication topology structure described in any one of the items of the present invention.

[0074] Preferably, any ring network in the communication system adopts any ring network communication synchronization method described in the present invention.

[0075] The power electronic equipment ring network communication topology of the present invention employs a ring network structure for both the control and valve control network and the valve control and power module network. Each ring network only requires the master device (control and valve control) to provide paired communication interfaces to achieve networking communication with multiple slave devices (valve control or power modules). This allows each master device to connect to more slave devices. More communication interfaces reduce the number of slave devices in each ring network, increasing the number of ring networks and reducing the number of devices affected by network failures. Furthermore, when slave devices are stored in one location and the master device in another, the number of optical fibers or cables extending from the slave devices remains constant at two, regardless of the number of slave devices in the ring network. Slave devices can communicate using shorter connecting cables, significantly reducing the burden of wiring construction and facilitating subsequent maintenance.

[0076] The ring network communication synchronization method of the present invention calculates the total communication delay of each ring network and the delay compensation value of each slave device, and then synchronizes the ring network based on the delay compensation value of each slave device. All slave devices in the entire ring network synchronize their tasks to the synchronization time obtained by adding the total delay to the master device's message transmission time, achieving the same master and slave task synchronization effect as in a point-to-point network structure. Furthermore, the master can automatically diagnose the integrity of the two ring networks in the current network by checking the number of messages received by its own port. By monitoring the number of messages sent by each slave device through the first and second ring networks, it is also possible to determine the location of communication link disconnection in the event of a network failure.

[0077] Other beneficial effects of the present invention will be explained through the introduction of specific technical features and technical solutions in the specific implementation methods. Those skilled in the art should be able to understand the beneficial technical effects brought about by the introduction of these technical features and technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] The preferred embodiment of the ring network communication topology structure of the ring network communication synchronization method according to the present invention will be described below with reference to the accompanying drawings.

[0079] Figure 1 This is a schematic diagram of the point-to-point network structure of the control and protection host, valve group control unit network and power module network in the prior art;

[0080] Figure 2 A schematic diagram of a ring network communication topology structure of a power electronic device according to a preferred embodiment of the present invention;

[0081] Figure 3 A schematic diagram of a ring network communication topology structure of a power electronic device according to another preferred embodiment of the present invention;

[0082] Figure 4 A schematic diagram of a ring network communication topology structure of a power electronic device according to another preferred embodiment of the present invention;

[0083] Figure 5 A schematic diagram of a ring network communication topology structure of a power electronic device according to another preferred embodiment of the present invention;

[0084] Figure 6 A schematic diagram of a ring network communication topology structure of a power electronic device according to another preferred embodiment of the present invention;

[0085] Figure 7 A schematic diagram of a ring network communication according to a preferred embodiment of the present invention;

[0086] Figure 8A schematic diagram of a ring network communication topology structure of a power electronic device according to another preferred embodiment of the present invention;

[0087] Figure 9 A schematic diagram of a ring network communication topology structure of a power electronic device according to another preferred embodiment of the present invention;

[0088] Figure 10 A schematic diagram of a ring network communication topology structure of a power electronic device according to another preferred embodiment of the present invention;

[0089] Figure 11 A schematic diagram of a ring network communication topology structure of a power electronic device according to another preferred embodiment of the present invention;

[0090] Figure 12 A schematic diagram of a ring network communication topology structure of a power electronic device according to another preferred embodiment of the present invention;

[0091] Figure 13 A diagram illustrating a ring network communication topology structure of a power electronic device according to another preferred embodiment of the present invention;

[0092] Figure 14 A schematic diagram of a ring network communication topology structure of a power electronic device according to another preferred embodiment of the present invention;

[0093] Figure 15 A flow chart of a ring network communication synchronization method according to a preferred embodiment of the present invention;

[0094] Figure 16 A schematic diagram of a ring network communication network implemented by a ring network communication synchronization method according to a preferred embodiment of the present invention;

[0095] Figure 17 for Figure 16 Timing diagram of task synchronization in the Zhonghuan Network communication network. DETAILED DESCRIPTION

[0096] In order to provide a more detailed description of the technical solution of the present application and to facilitate a further understanding of the present application, the specific implementation methods of the present application are described below in conjunction with the accompanying drawings. However, it should be understood that all illustrative embodiments and their descriptions are used to explain the present application and do not constitute the sole limitation of the present application.

[0097] In this application, “first”, “second”, “third”, “fourth”, etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0098] For large-scale cascaded multilevel power electronic equipment, the entire system typically consists of three layers of equipment: power modules (SMCs), valve block control units (VBCs), and control and protection hosts (PCSs). High-voltage cascaded multilevel converters often contain hundreds or even thousands of power modules. To manage this large number of power modules, the upper-level control equipment is divided into two levels: the control and protection host and the valve block control unit. The valve block control unit establishes network communication with hundreds of power modules, collecting, monitoring, and summarizing the status of each power module and reporting it to the control and protection host. It also sends corresponding control information to the power modules for control. The control and protection host collects analog quantities from the electrical circuits, collects the power module status summary reported by the valve block control unit, and ultimately makes control decisions for the entire system. The technical solution of the present invention is applicable to the network communication structure between the control and protection host, the valve block control unit, and the power modules. These three levels of equipment include two networks: the communication network between the control and protection host and the valve block control unit, and the communication network between the valve block control unit and the power modules. These networks can also be referred to as the control and protection network and the valve control network.

[0099] In traditional solutions, the control and valve control network and the valve control and power module network usually adopt a point-to-point network structure, such as Figure 1 As shown in the figure, a control and protection host is connected to six valve manifold control units, each of which is connected to six power modules. All communication links are connected via fiber optic cables. Because of the point-to-point network architecture, if any fiber in the valve control and power module network fails, the corresponding power module immediately loses connection with its upstream valve manifold control unit. If the system does not have redundant power modules, the entire system will cease to function. If any fiber in the control and protection network fails, the corresponding valve manifold control unit, including all six of its power modules, will lose control of the control and protection host, rendering the entire system inoperable. Therefore, the point-to-point network architecture places extremely high demands on the stability of each communication link. Without additional redundant design, the system cannot withstand the failure of any single fiber. Typically, power modules are installed in high-rise valve towers, while the control and protection devices and valve control units are typically housed in a control room. This results in a large number of fiber optic cables and long distances, complicating construction and subsequent maintenance.

[0100] Figure 2 This is a schematic diagram of a ring network communication topology structure of a power electronic equipment according to a preferred embodiment of the present invention. Figure 3The diagram is a schematic diagram of a power electronic device ring network communication topology according to another preferred embodiment of the present invention. Both devices include a first control and protection host (control and protection host (set A)), a second control and protection host (control and protection host (set B)), multiple valve group control unit sets (valve group control unit set 1, valve group control unit set 2, ..., valve group control unit set n), and multiple power modules. Each valve group control unit set includes a first valve group control unit group (set A valve group control unit) and a second valve group control unit group (set B valve group control unit). Each valve group control unit group includes multiple first valve group control units (the remaining valve groups in set A in valve group control unit set 1, the remaining valve groups in set A in valve group control unit set 2, and the remaining valve groups in set A in valve group control unit set n). Each second valve group control unit group includes multiple second valve group control units (the remaining valve groups in set B in valve group control unit set 1, the remaining valve groups in set B in valve group control unit set 2, and the remaining valve groups in set B in valve group control unit set n). The number of first and second valve group control units in each valve group control unit set is the same, and each first and second valve group control units in each valve group control unit set form a valve group control unit pair. For example, Figure 2 The number of first valve group control units in the first valve group control unit group (set A) in the valve group control unit set 1 is the same as the number of second valve group control units in the second valve group control unit group (set B), and the first valve group control units and the second valve group control units form a valve group control unit pair in pairs.

[0101] Among them, each pair of communication interfaces in the first control and protection host corresponds to each valve group control unit set one by one, and a pair of communication interfaces and a plurality of first valve group control units in the first valve group control unit set in the corresponding valve group control unit set are connected by ring network communication. Each pair of communication interfaces in the second control and protection host corresponds to each valve group control unit set one by one, and a pair of communication interfaces and a plurality of second valve group control units in the second valve group control unit set in the corresponding valve group control unit set are connected by ring network communication. For example Figure 2 In the figure, the first control and protection host (Control and Protection Host (Set A)) includes multiple pairs of communication interfaces (multiple pairs of communication interfaces A and B). The pair of communication interfaces (A and B) on the left side of the figure corresponds to valve group control unit set 1. This pair of communication interfaces is connected to the first valve group control unit (Valve Group Control Unit Set (Set A)) in valve group control unit set 1 via a ring network communication connection. The second control and protection host (Control and Protection Host (Set B)) also has a pair of communication interfaces (A and B) on the left side of the figure corresponding to valve group control unit set 1. This pair of communication interfaces is connected to the second valve group control unit (Valve Group Control Unit Set (Set B)) in valve group control unit set 1 via a ring network communication connection. The rest of the figure is similar and will not be repeated here.

[0102] Each pair of communication interfaces in the first valve group control unit in each valve group control unit pair is connected to at least one power module using a ring network communication connection, and each pair of communication interfaces in the second valve group control unit in each valve group control unit pair is connected to the at least one power module using a ring network communication connection. Figure 2 In the embodiment, each pair of communication interfaces (A1B1, A2B2, ..., AnBn) in the first valve group control unit in the valve group control unit set 1 is connected to multiple power modules using a ring network communication connection. At the same time, each pair of communication interfaces (A1B1, A2B2, ..., AnBn) in the second valve group control unit in the valve group control unit set 1 is also connected to the multiple power modules using a ring network communication connection. The rest is similar and will not be described here. Another embodiment is as follows: Figure 3 As shown, the output signals of the first valve group control unit and the second valve group control unit in each valve group control unit pair are selected and then connected to at least one power module through each pair of communication interfaces in a ring network communication connection. For example, Figure 3 The first and second valve group control units in the middle valve group control unit set 1 are connected to multiple power modules using a ring network communication connection through each pair of communication interfaces (A1B1, A2B2, ..., AnBn). The rest is similar and will not be repeated here.

[0103] In the above-described technical solution of the present invention, both the control and valve control network and the valve control and power module network adopt a ring network communication structure. Each ring network only requires the master device (control and valve control) to provide paired communication interfaces to achieve networking communication with multiple slave devices (valve control or power modules). This allows each master device to connect to more slave devices. More communication interfaces reduce the number of slave devices in each ring network, increasing the number of ring networks and reducing the number of devices affected by network failures. Furthermore, when slave devices are stored in one location and the master device in another, the number of optical fibers or cables leading from the slave devices remains constant at two, regardless of the number of slave devices in the ring network. Slave devices can communicate using shorter connecting cables, significantly reducing the burden of wiring construction and facilitating subsequent maintenance.

[0104] In a preferred embodiment, multiple valve group control unit sets can be grouped according to the characteristics of industrial alternating current. Alternating current includes phase A, phase B, and phase C. The multiple valve group control unit sets can be set according to phase A, phase B, and phase C of the alternating current. They can be set to a first valve group control unit set, a second valve group control unit set, and a third valve group control unit set, such as Figure 4 and 5As shown, the first valve group control unit set (A-phase valve group control unit set) controls the A-phase power module in the AC power, the second valve group control unit set (B-phase valve group control unit set) controls the B-phase power module in the AC power, and the third valve group control unit set (C-phase valve group control unit set) controls the C-phase power module in the AC power.

[0105] In a preferred embodiment, the first control and protection host and the second control and protection host may include multiple pairs of communication interfaces, each pair of communication interfaces including a first communication interface and a second communication interface, and each first valve group control unit and each second valve group control unit in the plurality of valve group control unit sets include a pair of input communication interfaces, the pair of input communication interfaces also including a first communication interface and a second communication interface. The first control and protection host and the plurality of first valve group control units in the first valve group control unit group in each valve group control unit set may be connected using a ring network communication connection as follows: the first communication interface of the pair of communication interfaces of the first control and protection host is connected to the first communication interface of the input end of the first first valve group control unit in the first valve group control unit set in the corresponding valve group control unit set, the second communication interface of the input end of the first first valve group control unit is connected to the first communication interface of the input end of the second first valve group control unit, the second communication interface of the input end of the second first valve group control unit is connected to the first communication interface of the input end of the third first valve group control unit, and so on until the last first valve group control unit in the first valve group control unit set in the corresponding valve group control unit set, whereupon the second communication interface of the input end of the last first valve group control unit in the first valve group control unit set in the corresponding valve group control unit set is connected to the second communication interface of the pair of communication interfaces of the first control and protection host.

[0106] The communication interface of the valve group control unit input mentioned in the present invention refers to a pair of communication interfaces that connect the valve group control unit to the control and protection host. For a valve group control unit, it usually has multiple pairs of communication interfaces. When one pair of communication interfaces is selected to connect to the control and protection host, the present invention refers to the pair of communication interfaces as the communication interface of the valve group control unit input. For example Figure 4 and 5 In the embodiment, each valve group control unit in the set A valve group control unit group of the A phase valve group control unit concentration has a pair of communication interfaces that are connected to the control and protection host (set A) to form a ring network. These communication interfaces are the communication interfaces of the input end of the valve group control unit in the present invention.

[0107] For example, Figure 4As shown in FIG, the first pair of communication interfaces on the left side of the control and protection host (set A) includes a first communication interface A and a second communication interface B. The first communication interface A is connected to the first communication interface (B) of the input end of the first first valve group control unit in the set A valve group control unit group in the phase A valve group control unit set in the figure. The second communication interface (A) of the input end of the first first valve group control unit is connected to the first communication interface (B) of the input end of the second first valve group control unit. The second communication interface (A) of the input end of the second first valve group control unit is connected to the first communication interface (B) of the input end of the third first valve group control unit. The connections are connected in sequence until all the first valve group control units in the set A valve group control unit group in the phase A valve group control unit set are connected. The second communication interface (A) of the input end of the last first valve group control unit in the set A valve group control unit group in the phase A valve group control unit set is connected to the second communication interface B in the first pair of communication interfaces on the left side of the control and protection host (set A), thereby forming a ring network. The rest is similar and will not be repeated here.

[0108] The second control protection host and the multiple second valve group control units in the second valve group control unit group in each valve group control unit concentration adopt a ring network communication connection as follows: the first communication interface in a pair of communication interfaces of the second control protection host is connected to the first communication interface of the first second valve group control unit input end of the second valve group control unit group in the corresponding valve group control unit concentration, the second communication interface at the input end of the first second valve group control unit is connected to the first communication interface at the input end of the second second valve group control unit, the second communication interface at the input end of the second second valve group control unit is connected to the first communication interface at the input end of the third second valve group control unit, and so on until the multiple second valve group control units of the second valve group control unit group in the corresponding valve group control unit concentration are connected, and the second communication interface at the input end of the last second valve group control unit of the second valve group control unit group in the corresponding valve group control unit concentration is connected to the second communication interface in a pair of communication interfaces of the second control protection host.

[0109] For example, Figure 4As shown in the figure, the first pair of communication interfaces on the left side of the control and protection host (set B) includes a first communication interface A and a second communication interface B. The first communication interface A is connected to the first communication interface (B) of the input end of the first second valve group control unit in the set B valve group control unit group in the A phase valve group control unit set in the figure. The second communication interface (A) of the input end of the first second valve group control unit is connected to the first communication interface (B) of the input end of the second second valve group control unit. The second communication interface (A) of the input end of the second second valve group control unit is connected to the first communication interface (B) of the input end of the third second valve group control unit. The connections are connected in sequence until all the second valve group control units in the set B valve group control unit group in the A phase valve group control unit set are connected. The second communication interface (A) of the input end of the last second valve group control unit in the set B valve group control unit group in the A phase valve group control unit set is connected to the second communication interface B in the first pair of communication interfaces on the left side of the control and protection host (set B), thereby forming a ring network. The rest is similar and will not be repeated here.

[0110] For the above description Figure 4 The ring network formed by the central control protection host (set B) and the set B valve group control unit group of the A phase valve group control unit is used as an example for explanation. The ring network diagram is as follows Figure 7 As shown, the master device corresponds to the control and protection master (set B) in the ring network, and slave devices 1 through N correspond to multiple second valve group control units in the set B of valve group control units within the A-phase valve group control unit cluster. All devices provide at least two communication interfaces, port A and port B, for data transmission and reception, forming two communication network rings in opposite directions: Ring A and Ring B. Furthermore, all slave devices forward received messages. For Ring A, a message from the master device is sent from its port A and received by port B of slave device 1. Slave device 1 then forwards this message from its port A, where it is received by port B of slave device 2. Finally, this message is forwarded back from port A of slave device N to port B of the master device. At this point, the master device's message is received by all slave devices. For Ring B, a message from the master device is sent from its port B and received by port A of slave device N. Slave device N then forwards this message from its port B, where it is received by port A of slave device N-1. The message is then forwarded from port B of slave device 1 back to port A of the master device. At this point, the master device's message is received by all slave devices. If a slave device needs to send a message to the master device, it can either send it from port A, which is then forwarded by other slave devices along ring A and ultimately reaches port B of the master device. Alternatively, it can send it from port B, which is then forwarded by other slave devices along ring B and ultimately reaches port A of the master device.

[0111] It can be seen that since the ring network includes two directions, Ring A and Ring B, if any communication link in the ring network in the technical solution of the present invention fails, the broadcast message of the master device can always reach any slave device along one of the rings A or Ring B, and the message of the slave device can still reach the master device along one of the rings, and the network communication is completely unaffected.

[0112] In a preferred embodiment, each power module includes a first pair of communication interfaces and a second pair of communication interfaces, the first pair of communication interfaces includes a first communication interface and a second communication interface, the second pair of communication interfaces includes a third communication interface and a fourth communication interface, the first valve group control unit in each valve group control unit concentration includes multiple pairs of output end communication interfaces, the second valve group control unit in each valve group control unit concentration includes multiple pairs of output end communication interfaces, and each pair of communication interfaces in the first valve group control unit in each valve group control unit pair is connected to at least one power module in a ring network communication connection manner: the first communication interface at the output end of the first valve group control unit is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, and the second communication interface of the second power module is connected to The first communication interface of the third power module is connected in sequence until the last power module, and the second communication interface of the last power module is connected to the second communication interface of the output end of the first valve group control unit; each pair of communication interfaces in the second valve group control unit in each valve group control unit pair is connected to the at least one power module in a ring network communication connection manner: the first communication interface of the output end of the second valve group control unit is connected to the third communication interface of the first power module, the fourth communication interface of the first power module is connected to the third communication interface of the second power module, and the fourth communication interface of the second power module is connected to the third communication interface of the third power module, and so on until the last power module, and the fourth communication interface of the last power module is connected to the second communication interface of the output end of the second valve group control unit.

[0113] The communication interface at the output end of the valve group control unit mentioned in the present invention refers to a pair of communication interfaces that connect the valve group control unit to the power module. For a valve group control unit, it usually has multiple pairs of communication interfaces. When one pair of communication interfaces is selected to connect to the power module, the pair of communication interfaces is referred to as the communication interface at the output end of the valve group control unit in the present invention. For example Figure 4 and 5 In the embodiment, each valve group control unit in the set A valve group control unit group of the A phase valve group control unit concentration has multiple pairs of communication interfaces connected to the power module to form a ring network. These communication interfaces are the communication interfaces at the output end of the valve group control unit in the present invention.

[0114] For example Figure 2 and4 As shown in , each power module includes a first pair of communication interfaces (B1A1) and a second pair of communication interfaces (B2A2). The first pair of communication interfaces (B1A1) includes a first communication interface B1 and a second communication interface A1, and the second pair of communication interfaces (B2A2) includes a third communication interface B2 and a fourth communication interface A2. Figure 4 For example, the first valve group control unit in the first valve group control unit group (set A) of the phase A valve group control unit set includes multiple pairs of communication interfaces (A1B1, A2B2, ..., AnBn), and the second valve group control unit in the second valve group control unit group (set B) of the phase A valve group control unit set includes multiple pairs of communication interfaces (A1B1, A2B2, ..., AnBn). Each pair of communication interfaces is connected to multiple power modules using a ring network communication. Taking the A1B1 communication interface of the first valve group control unit and the A1B1 communication interface of the second valve group control unit as an example, the first communication interface A1 of the first valve group control unit is connected to the first communication interface B1 of the first power module, the second communication interface A1 of the first power module is connected to the first communication interface B1 of the second power module, and the second communication interface A1 of the second power module is connected to the first communication interface B1 of the third power module. This connection sequence continues until the last power module, where the second communication interface A1 of the last power module is connected to the second communication interface B1 at the output end of the first valve group control unit, thus forming a ring network. The first communication interface A1 of the second valve group control unit is connected to the third communication interface B2 of the first power module, the fourth communication interface A2 of the first power module is connected to the third communication interface B2 of the second power module, and the fourth communication interface A2 of the second power module is connected to the third communication interface B2 of the third power module, and so on until the last power module, where the fourth communication interface A2 of the last power module is connected to the second communication interface B1 at the output end of the second valve group control unit, thereby forming a ring network. In other words, the first valve group control unit and the second valve group control unit in the valve group control unit pair within the same valve group control unit set are connected to the same group of power modules, and both the first valve group control unit and the second valve group control unit in the valve group control unit pair can control the same group of power modules.

[0115] In a preferred embodiment, the output signals of the first valve group control unit and the second valve group control unit in each valve group control unit pair are output through multiple pairs of output end communication interfaces after being selected from two options, and each pair of the output end communication interfaces includes a first communication interface and a second communication interface. The output signals of the first valve group control unit and the second valve group control unit in each valve group control unit pair can be connected to at least one power module through each pair of communication interfaces using a ring network communication connection after being selected from two options. Specifically, it can be: the first communication interface in a pair of communication interfaces in each pair of communication interfaces is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, and the second communication interface of the second power module is connected to the first communication interface of the third power module, and so on until the last power module, and the second communication interface of the last power module is connected to the first communication interface in the communication interface.

[0116] like Figure 3 and 5 As shown in FIG, the output ends of the first valve group control unit and the second valve group control unit in a valve group control unit pair in the valve group control unit set are connected to multiple power modules through multiple communication interfaces (A1B1, A2B2...AnBn) at the output ends after selecting one of the two. Figure 5 Taking the A1B1 communication interface at the output end as an example, after the two-choice selection, the first communication interface A1 of the output end is connected to the first communication interface B of the first power module, the second communication interface A of the first power module is connected to the first communication interface B of the second power module, the second communication interface A of the second power module is connected to the first communication interface B of the third power module, and so on until the last power module, and the second communication interface A of the last power module is connected to the second communication interface B1 of the output end, thereby forming a ring network. In a specific embodiment, the method for selecting the output signal of a first valve group control unit in the first valve group control unit group (set A) and a second valve group control unit in the second valve group control unit group (set B) in the above-mentioned A-phase valve group control unit set can be to judge by a software method based on the message information output by the first valve group control unit and the second valve group control unit, thereby achieving the two-choice selection. For example, when the message from the first control protection host received by the first valve group control unit contains a system duty command, the two-choice logic in the software algorithm will choose to output the message of the first valve group control unit. When the message from the second control protection host received by the second valve group control unit contains a system duty command, the two-choice logic in the software algorithm will choose to output the message of the second valve group control unit.

[0117] In another embodiment, for example Figure 6As shown in , the output ends of the first valve group control unit and the second valve group control unit in a valve group control unit pair in the valve group control unit concentration are output through a two-to-one selector. The output end of the two-to-one selector has multiple communication interfaces (A1B1, A2B2...AnBn), which output signals of the first valve group control unit or the second valve group control unit. Taking the A1B1 communication interface at the output end of the two-to-one selector as an example, the first communication interface A1 at the output end of the two-to-one selector is connected to the first communication interface B of the first power module, the second communication interface A of the first power module is connected to the first communication interface B of the second power module, and the second communication interface A of the second power module is connected to the first communication interface B of the third power module. The connections are made in this order until the last power module, and the second communication interface A of the last power module is connected to the second communication interface B1 at the output end of the two-to-one selector, thereby forming a ring network.

[0118] In a preferred embodiment, when each pair of communication interfaces in the first valve group control unit in the valve group control unit pair is connected to at least one power module using a ring network communication connection, and each pair of communication interfaces in the second valve group control unit in the valve group control unit pair is connected to the at least one power module using a ring network communication connection, the valve group control unit pair simultaneously receives the message commands from the valve group control unit to the first valve group control unit and the second valve group control unit, and executes the message commands of the duty unit. The duty unit is: when the message from the first control protection host received by the first valve group control unit contains a system duty command (ACTIVE state), the first valve group control unit is the duty unit, that is, the power module executes the message command of the first valve group control unit; when the message from the second control protection host received by the second valve group control unit contains a system duty command, the second valve group control unit is the duty unit, that is, the power module executes the message command of the second valve group control unit. That is, if the message received by the valve group control unit contains a system duty command (ACTIVE state), then this valve group control unit is the duty unit. For example Figure 4 In the example, the control and protection host (set A) sends a message to the valve group control unit (set A) in the A-phase valve group control unit set. The message does not contain the system duty command. The control and protection host (set B) sends a message to the valve group control unit (set B) in the A-phase valve group control unit set. The message contains the system duty command. Then the valve group control unit (set B) in the A-phase valve group control unit set is the duty unit. Then the power module connected to the A-phase valve group control unit set executes the message command sent by the valve group control unit (set B).

[0119] In a preferred embodiment, when the output signals of the first valve group control unit and the second valve group control unit in the valve group control unit pair are connected to at least one power module through each pair of communication interfaces by adopting a ring network communication connection after being selected from two alternatives, the power module receives the message command of the duty unit output by the first valve group control unit and the second valve group control unit in the valve group control unit pair after being selected from two alternatives, and executes the message command of the duty unit. The duty unit is: when the message from the first control protection host received by the first valve group control unit contains a system duty command, the first valve group control unit is the duty unit; when the message from the second control protection host received by the second valve group control unit contains a system duty command, the second valve group control unit is the duty unit. For example Figure 5 In the example, the control and protection host (set A) sends a message to the valve group control unit (set A) in the A-phase valve group control unit concentration. The message does not contain the system duty command. The control and protection host (set B) sends a message to the valve group control unit (set B) in the A-phase valve group control unit concentration. The message contains the system duty command. Then the valve group control unit (set B) in the A-phase valve group control unit concentration is the duty unit. Then the A-phase valve group control unit set will output the message command of the valve group control unit (set B) to the power module connected to it after selecting one of the two.

[0120] In a preferred embodiment, the first control and protection host and the second control and protection host are capable of inter-system communication. In a specific embodiment, through inter-system communication, the two control and protection hosts can transmit real-time operating status information, fault alarm information, and the like to each other. When a fault occurs in either control and protection host, the other control and protection host can be promptly notified through inter-system communication, thereby controlling the other control and protection host to take over and control the system, ensuring the reliability and stability of system operation. Inter-system communication between the two control and protection hosts can be achieved through methods such as fieldbus communication, industrial Ethernet, fiber optic communication, and time-sensitive networking (TSN). For example, fiber optic communication transmits data via optical fiber and supports Ethernet or dedicated protocols (such as IEC 61850 GOOSE / SV messages). Time-sensitive networking (TSN) is based on enhanced technology of standard Ethernet and achieves deterministic real-time communication through time synchronization and traffic scheduling.

[0121] In a preferred embodiment, the number of first valve group control units, the number of second valve group control units, and the number of power modules connected to each valve group control unit can be set according to the voltage level. The higher the voltage level, the more power modules there are, and the more valve group control units there are. China's voltage level classification standards are generally as follows: low voltage (LV): 0.4 kV (380V / 220V), medium voltage (MV): 10 kV, 20 kV, 35 kV, high voltage (HV): 66 kV, 110 kV, 220 kV, extra high voltage (EHV): 330 kV, 500 kV, 750 kV, and ultra-high voltage (UHV): AC 1000 kV, DC ±800 kV, ±1100 kV. Voltage levels can also be categorized by application scenario. For example, the generation-side voltage levels can be divided into: high voltage (110-220 kV): the grid-connected voltage for traditional thermal power plants and large hydropower stations; and ultra-high voltage / ultra-high voltage (500 kV and above): for long-distance transmission of large renewable energy bases (such as wind power and photovoltaic power). Specifically, the number of first and second valve group control units in each valve group control unit group, as well as the number of power modules connected to each valve group control unit, can be set based on the voltage level required by the user.

[0122] In a preferred embodiment, the first and second valve group control units in each valve group control unit pair can be deployed within a single device chassis. Specifically, the left and right halves of the chassis house the first and second valve group control units, respectively. Alternatively, the first and second valve group control units in each valve group control unit pair can be deployed independently. Specifically, the first and second valve group control units can be independent devices. Users can configure this configuration based on actual needs.

[0123] Figure 2-6 The connection relationship between one valve group control unit pair in each valve group control unit set and the power module is given as an example. It can be understood that the remaining valve group control unit pairs in each valve group control unit set in the above technical solution of the present invention are also connected to at least one power module in the same way.

[0124] The present invention also discloses another power electronic equipment ring network communication topology structure, such as Figure 8 、 9As shown in Figure 10, it includes a first control and protection host (control and protection host (set A)), a second control and protection host (control and protection host (set B)), a plurality of valve group control unit sets (valve group control unit set 1, valve group control unit set 2...valve group control unit set n) and a plurality of power modules, each valve group control unit set includes a first valve group control unit (valve group control unit (set A)) and a second valve group control unit (valve group control unit (set B)); wherein, as Figure 8 As shown, the first control protection host is connected to the first valve group control unit in each valve group control unit using a ring network communication, and the second control protection host is connected to the second valve group control unit in each valve group control unit using a ring network communication, or, as shown Figure 9 As shown, the first control protection host is connected to the first valve group control unit in each valve group control unit using point-to-point communication, and the second control protection host is connected to the second valve group control unit in each valve group control unit using point-to-point communication. The first valve group control unit and the second valve group control unit in each valve group control unit include at least one pair of output end communication interfaces ( Figure 8 and 9 The communication interface A1B1, A2B2...AnBn at the output end of each valve group control unit in the valve group is connected to at least one power module through the output end communication interface by adopting a ring network communication connection, and each second valve group control unit is connected to at least one power module through the output end communication interface by adopting a ring network communication connection, or, the output signals of the first valve group control unit and the second valve group control unit in each valve group control unit are selected from the two and then connected to at least one power module through each pair of communication interfaces by adopting a ring network communication connection.

[0125] Compared with the attached Figure 2-6 The power electronic equipment ring network communication topology shown, Figure 8 、 9 The power electronic equipment ring network communication topology shown in Figure 10 is suitable for the case where the number of valve group control units is small. The control and protection host and the valve group control unit in each system form a ring network or adopt a point-to-point communication connection.

[0126] In the present invention, if the devices are connected by a ring network, then the communication interface of the corresponding host device has both sending and receiving functions. If the devices are connected by a point-to-point communication, then one of the communication interfaces of the corresponding host device is used for sending and the other is used for receiving. Figure 9 and 10In the process, multiple pairs of communication interfaces of the two control and protection hosts are connected to the valve group control unit centralized in the valve group control unit in a point-to-point communication connection mode, wherein one of the communication interfaces is used for sending (TX) and the other is used for receiving (RX).

[0127] In a preferred embodiment, when the first control protection host is connected to the first valve group control unit in each valve group control unit concentration by a ring network communication, and the second control protection host is connected to the second valve group control unit in each valve group control unit concentration by a ring network communication, the first control protection host and the second control protection host both include a first communication interface and a second communication interface, and the first valve group control unit and the second valve group control unit in multiple valve group control units both include a pair of input end communication interfaces, and the input end communication interfaces include a first communication interface and a second communication interface; wherein the first control protection host and the first valve group control unit in each valve group control unit concentration are connected by a ring network communication as follows: the first communication interface of the first control protection host is connected to the first communication interface of the input end of the first valve group control unit in the first valve group control unit concentration, the second communication interface of the input end of the first valve group control unit in the first valve group control unit concentration is connected to the first communication interface of the input end of the first valve group control unit in the second valve group control unit concentration, and the second communication interface of the input end of the first valve group control unit in the second valve group control unit concentration is connected to the input end of the first valve group control unit in the third valve group control unit concentration. The first communication interface of the end, and so on are connected in sequence until the first valve group control unit in the last valve group control unit concentration, the second communication interface of the first valve group control unit input end in the last valve group control unit concentration is connected to the second communication interface of the first control protection host; the second control protection host and the second valve group control unit in each valve group control unit concentration adopt a ring network communication connection as follows: the first communication interface of the second control protection host is connected to the first communication interface of the second valve group control unit input end in the first valve group control unit concentration, the second communication interface of the second valve group control unit input end in the first valve group control unit concentration is connected to the first communication interface of the second valve group control unit input end in the second valve group control unit concentration, the second communication interface of the second valve group control unit input end in the second valve group control unit concentration is connected to the first communication interface of the second valve group control unit input end in the third valve group control unit concentration, and so on are connected in sequence until the second valve group control unit in the last valve group control unit concentration, the second communication interface of the second valve group control unit input end in the last valve group control unit concentration is connected to the second communication interface of the second control protection host.

[0128] like Figure 8As shown, the first communication interface A of the control and protection host (set A) is connected to the first communication interface B of the valve group control unit (set A) in the valve group control unit set 1, the second communication interface A of the valve group control unit (set A) in the valve group control unit set 1 is connected to the first communication interface B of the valve group control unit (set A) in the valve group control unit set 2, the second communication interface A of the valve group control unit (set A) in the valve group control unit set 2 is connected to the first communication interface B of the valve group control unit (set A) in the next valve group control unit set, and so on until the valve group control unit (set A) in the last valve group control unit set n, the second communication interface A of the valve group control unit (set A) in the last valve group control unit set n is connected to the second communication interface B of the control and protection host (set A), thereby forming a ring network. The first communication interface A of the control and protection host (set B) is connected to the first communication interface B of the valve group control unit (set B) in the valve group control unit set 1, the second communication interface A of the valve group control unit (set B) in the valve group control unit set 1 is connected to the first communication interface B of the valve group control unit (set B) in the valve group control unit set 2, the second communication interface A of the valve group control unit (set B) in the valve group control unit set 2 is connected to the first communication interface B of the valve group control unit (set B) in the next valve group control unit set, and so on until the valve group control unit (set B) in the last valve group control unit set n, the second communication interface A of the valve group control unit (set B) in the last valve group control unit set n is connected to the second communication interface B of the control and protection host (set B), thereby forming a ring network.

[0129] In a preferred embodiment, when the first control protection host and the first valve group control unit in each valve group control unit set adopt a point-to-point communication connection, and the second control protection host and the second valve group control unit in each valve group control unit set adopt a point-to-point communication connection, the first control protection host and the second control protection host both include multiple pairs of communication interfaces, each pair of communication interfaces corresponds to one of the valve group control unit sets, each pair of communication interfaces includes a first communication interface and a second communication interface, and the first valve group control unit and the second valve group control unit in the multiple valve group control unit sets both include an input end communication interface, and the input end communication interface includes a first communication interface and a second communication interface; wherein, the first control protection host and the first valve group control unit in each valve group control unit set adopt a point-to-point communication connection. The point-to-point communication connection is as follows: the first communication interface in each pair of communication interfaces of the first control and protection host is connected to the first communication interface of the first valve group control unit in the corresponding valve group control unit concentration, and the second communication interface of the first valve group control unit in the corresponding valve group control unit concentration is connected to the second communication interface in the corresponding communication interface of the first control and protection host; the second control and protection host and the second valve group control unit in each valve group control unit concentration are connected to the point-to-point communication connection: the first communication interface in each pair of communication interfaces of the second control and protection host is connected to the first communication interface of the second valve group control unit in the corresponding valve group control unit concentration, and the second communication interface of the second valve group control unit in the corresponding valve group control unit concentration is connected to the second communication interface in the corresponding communication interface of the first control and protection host.

[0130] like Figure 9 and 10 As shown in the figure, taking the control and protection host (set A) as an example, the control and protection host (set A) includes multiple pairs of communication interfaces (multiple pairs of communication interfaces A and B). Each pair of communication interfaces A and B corresponds to a valve group control unit set. The leftmost communication interfaces A and B in the control and protection host (set A) correspond to Figure 9 and 10 The second pair of communication interfaces A and B in the control unit set 1 of the middle valve group control protection host (set A) correspond to Figure 9 and 10 The communication interfaces A and B on the right of the control unit set 2 of the middle valve group control protection host (set A) correspond to Figure 9 and 10 In the valve group control unit set n, the first valve group control unit and the second valve group control unit in each valve group control unit set include input end communication interfaces (A and B), wherein the leftmost communication interfaces A and B in the control protection host (set A) correspond to the input end communication interfaces (A and B). Figure 9 and 10The valve group control unit set 1 uses a point-to-point communication connection. That is, the leftmost communication interface A of the control and protection host (set A) is connected to the first communication interface B of the valve group control unit (set A) in valve group control unit set 1, and the second communication interface of the valve group control unit (set A) in valve group control unit set 1 is connected to the leftmost communication interface B of the control and protection host (set A), thus forming a ring network. The rest of the network is similar and will not be repeated here.

[0131] In a preferred embodiment, each pair of the output end communication interfaces of each first valve group control unit and the second valve group control unit includes a first communication interface and a second communication interface, each of the power modules includes a first pair of communication interfaces and a second pair of communication interfaces, the first pair of communication interfaces includes a first communication interface and a second communication interface, and the second pair of communication interfaces includes a third communication interface and a fourth communication interface, wherein each of the first valve group control units is connected to at least one power module via the output end communication interface using a ring network communication connection: the first communication interface at the output end of the first valve group control unit is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, and the second communication interface of the second power module is connected to the third power module. The first communication interface is connected in sequence until the last power module, and the second communication interface of the last power module is connected to the second communication interface of the output end of the first valve group control unit; each second valve group control unit is connected to the at least one power module through the output end communication interface using a ring network communication connection: the first communication interface of the output end of the second valve group control unit is connected to the third communication interface of the first power module, the fourth communication interface of the first power module is connected to the third communication interface of the second power module, and the fourth communication interface of the second power module is connected to the third communication interface of the third power module, and so on until the last power module, and the fourth communication interface of the last power module is connected to the second communication interface of the output end of the second valve group control unit.

[0132] like Figure 8 and 9 As shown, the first valve group control unit (valve group control unit (set A)) and the second valve group control unit (valve group control unit (set B)) each include multiple pairs of output end communication interfaces, each pair of output end communication interfaces includes a first communication interface and a second communication interface (A1 and B1, A2 and B2...An and Bn), each power module includes a first pair of communication interfaces (B1A1) and a second pair of communication interfaces (B2A2), the first pair of communication interfaces includes a first communication interface B1 and a second communication interface A1, and the second pair of communication interfaces includes a first communication interface B2 and a second communication interface A2. Figure 8Taking the valve group control unit (set A) in valve group control unit set 1 as an example, the first communication interface A1 at the output of the valve group control unit (set A) is connected to the first communication interface B1 of the first power module, the second communication interface A1 of the first power module is connected to the first communication interface B1 of the second power module, the second communication interface A1 of the second power module is connected to the first communication interface B1 of the third power module, and so on until the last power module, at which point the second communication interface A1 of the last power module is connected to the second communication interface B at the output of the valve group control unit (set A), thereby forming a ring network. The first communication interface A1 at the output of the valve group control unit (set B) is connected to the third communication interface B2 of the first power module, the fourth communication interface A2 of the first power module is connected to the third communication interface B2 of the second power module, and the fourth communication interface A2 of the second power module is connected to the third communication interface B2 of the third power module, and so on until the last power module, at which point the fourth communication interface A2 of the last power module is connected to the second communication interface B at the output of the valve group control unit (set B), thereby forming a ring network. The rest of the connections are similar and will not be repeated here.

[0133] In a preferred embodiment, the valve group control unit concentrates the output signals of the first valve group control unit and the second valve group control unit, and after selecting one of the two, connects at least one of the power modules through each pair of communication interfaces using a ring network communication connection. It can be: the first communication interface in each pair of communication interfaces is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, and the second communication interface of the second power module is connected to the first communication interface of the third power module, and so on until the last power module, and the second communication interface of the last power module is connected to the second communication interface of the communication interfaces.

[0134] like Figure 10 As shown, taking the valve group control unit set 1 as an example, the output signals of the first valve group control unit and the second valve group control unit are connected to the first communication interface B of the first power module through the first communication interface A1 of the output end after one of the two is selected, the second communication interface A of the first power module is connected to the first communication interface B of the second power module, the second communication interface A of the second power module is connected to the first communication interface B of the third power module, and so on until the last power module, the second communication interface A of the last power module is connected to the second communication interface B1 of the output end, thereby forming a ring network.

[0135] In a preferred embodiment, when each of the first valve group control units is connected to at least one of the power modules via the output end communication interface using a ring network communication connection, and each of the second valve group control units is connected to at least one of the power modules via the output end communication interface using a ring network communication connection, the power module connected to each of the valve group control units simultaneously receives message commands from the first valve group control unit group and the second valve group control unit group in the valve group control unit, and executes message commands from the duty unit. The duty unit is: when the message from the first control protection host received by the first valve group control unit group contains a system duty command, the first valve group control unit group is the duty unit; when the message from the second control protection host received by the second valve group control unit group contains a system duty command, the second valve group control unit group is the duty unit. For example Figure 8 and 9 As shown in the figure, the control and protection host (set A) sends a message to the valve group control unit in the valve group control unit set 1. The message does not contain the system duty command. The control and protection host (set B) sends a message to the valve group control unit (set B) in the valve group control unit set 1. The message contains the system duty command. Then the valve group control unit (set B) in the valve group control unit set 1 is the duty unit, and the power module connected to the valve group control unit set 1 executes the message command sent by the valve group control unit (set B).

[0136] In a preferred embodiment, when the output signals of the first valve group control unit and the second valve group control unit in each valve group control unit are connected to at least one power module through each pair of communication interfaces by adopting a ring network communication connection after being selected from two alternatives, the power module receives the message command of the duty unit output by the first valve group control unit and the second valve group control unit in the valve group control unit pair after being selected from two alternatives; the duty unit is: when the message from the first control protection host received by the first valve group control unit contains a system duty command, the first valve group control unit is the duty unit, and when the message from the second control protection host received by the second valve group control unit contains a system duty command, the second valve group control unit is the duty unit. For example Figure 10 In the example, the control and protection host (set A) sends a message to the valve group control unit (set A) in the valve group control unit set 1. The message does not contain the system duty command. The control and protection host (set B) sends a message to the valve group control unit (set B) in the valve group control unit set 1. The message contains the system duty command. Then the valve group control unit (set B) in the valve group control unit set 1 is the duty unit. Then the valve group control unit set 1 will output the message command of the valve group control unit (set B) to the power module connected to it after selecting one of the two.

[0137] In a preferred embodiment, the number of power modules connected to each valve group control unit can be set according to the voltage level. The higher the voltage level, the greater the number of power modules. Specifically, the number of power modules connected to each valve group control unit can be set according to the voltage level required by the user.

[0138] In a preferred embodiment, the first and second control and protection hosts are capable of inter-system communication. In a specific embodiment, inter-system communication allows the two control and protection hosts to transmit real-time operating status information, fault warning information, and other information to each other. If a fault occurs in either control and protection host, inter-system communication allows the other host to be promptly notified, allowing the other control and protection host to take control of the system, ensuring reliable and stable system operation.

[0139] In a preferred embodiment, the first valve group control unit and the second valve group control unit in each valve group control unit can be deployed in a device chassis. Of course, they can also be independent. Users can set them according to actual needs.

[0140] In the above technical solution, two sets of control and protection systems are used for redundant operation, one of which is in active state and the other is in hot standby operation. When one of the systems fails, it will switch to the other system to continue operation, thereby ensuring reliability.

[0141] The present invention also discloses another power electronic equipment ring network communication topology structure, such as Figure 11 As shown, the system includes a control and protection host, multiple valve group control unit groups (valve group control unit group 1, valve group control unit group 2, ..., valve group control unit group n), and multiple power modules. Each valve group control unit group includes multiple valve group control units. The control and protection host includes multiple pairs of communication interfaces (multiple pairs of communication interfaces A and B), each pair of which corresponds to each valve group control unit group. The control and protection host is connected to the valve group control units in each corresponding valve group control unit group via each pair of communication interfaces using a ring network communication connection. Each valve group control unit includes multiple pairs of output communication interfaces (A1 and B1, A2 and B2, ..., An and Bn), each of which is connected to at least one of the power modules using a ring network communication connection.

[0142] In a preferred embodiment, each pair of communication interfaces of the control and protection host includes a first communication interface and a second communication interface, and each valve group control unit includes a pair of input end communication interfaces, and the input end communication interface includes a first communication interface and a second communication interface, wherein the control and protection host adopts a ring network communication connection with the valve group control units in each corresponding valve group control unit group through each pair of communication interfaces: the first communication interface of the pair of communication interfaces of the control and protection host is connected to the first communication interface of the input end of the first valve group control unit in the corresponding valve group control unit group, the second communication interface of the input end of the first valve group control unit is connected to the first communication interface of the input end of the second valve group control unit, and the second communication interface of the input end of the second valve group control unit is connected to the first communication interface of the input end of the third valve group control unit, and so on until the last valve group control unit in the corresponding valve group control unit group, and the second communication interface of the input end of the last valve group control unit is connected to the second communication interface of the control and protection host.

[0143] For example Figure 11 In the figure, the first communication interface A of the pair of communication interfaces A and B on the far left of the control protection host is connected to the first communication interface B of the first valve group control unit in the valve group control unit group 1, the second communication interface A of the first valve group control unit is connected to the first communication interface B of the second valve group control unit, the second communication interface A of the second valve group control unit is connected to the first communication interface B of the third valve group control unit, until the first communication interface B of the last valve group control unit in the valve group control unit group 1, the second communication interface A of the last valve group control unit in the valve group control unit group 1 is connected to the second communication interface B of the pair of communication interfaces on the far left of the control protection host, thereby forming a ring network.

[0144] In a preferred embodiment, each of the power modules includes a first communication interface and a second communication interface, and each pair of output end communication interfaces of each valve group control unit is connected to at least one of the power modules in a ring network communication connection manner: the first communication interface of a pair of communication interfaces at the output end of the valve group control unit is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, and the second communication interface of the second power module is connected to the first communication interface of the third power module, and so on until the last power module, and the second communication interface of the last power module is connected to the second communication interface of a pair of communication interfaces at the output end of the valve group control unit.

[0145] For example Figure 11In the figure, a pair of communication interfaces A1 and B1 in the first valve group control unit in the valve group control unit group 1 are taken as an example to illustrate. The first communication interface A1 is connected to the first communication interface B of the first power module, the second communication interface A of the first power module is connected to the first communication interface B of the second power module, and the second communication interface A of the second power module is connected to the first communication interface B of the third power module. The connections are made in this way until the last power module, and the second communication interface A of the last power module is connected to the second communication interface B1 of the valve group control unit, thereby forming a ring network.

[0146] In a preferred embodiment, Figure 12 As shown, multiple valve group control unit groups can be set up according to the A phase, B phase, and C phase of the AC power, including a first valve group control unit group, a second valve group control unit group, and a third valve group control unit group. The first valve group control unit group (the A phase valve group control unit group) controls the A phase power module of the AC power, the second valve group control unit group (the B phase valve group control unit group) controls the B phase power module of the AC power, and the third valve group control unit group (the C phase valve group control unit group) controls the C phase power module of the AC power. In other words, the topology includes three valve group control unit groups: the A phase valve group control unit group, the B phase valve group control unit group, and the C phase valve group control unit group.

[0147] The present invention also discloses another power electronic equipment ring network communication topology structure, such as Figure 13 and 14 As shown, the topology structure includes a control and protection host, multiple valve group control units and multiple power modules. The control and protection host and the multiple valve group control units are connected by ring network communication, or the control and protection host and the multiple valve group control units are connected by point-to-point communication; each valve group control unit includes multiple pairs of output end communication interfaces, and each pair of output end communication interfaces is connected to at least one power module by ring network communication connection.

[0148] When the number of valve group control units is small, the control and protection host and the valve group control units can form a ring network, such as Figure 13 The control and protection host and multiple valve group control units are connected by ring network communication. More generally, point-to-point communication is used between the control and protection host and the valve group control units, such as Figure 14 The central control protection host and multiple valve group control units are connected using point-to-point communication.

[0149] In a preferred embodiment, when the control and protection host is connected to multiple valve group control units using a ring network communication, the control and protection host includes a pair of communication interfaces, the pair of communication interfaces includes a first communication interface and a second communication interface, and each of the valve group control units includes a pair of input end communication interfaces, the input end communication interfaces include a first communication interface and a second communication interface; wherein, the control and protection host is connected to multiple valve group control units using a ring network communication as follows: the first communication interface of the control and protection host is connected to the first communication interface of the input end of the first valve group control unit, the second communication interface of the input end of the first valve group control unit is connected to the first communication interface of the input end of the second valve group control unit, the second communication interface of the input end of the second valve group control unit is connected to the first communication interface of the input end of the third valve group control unit, and so on until the last valve group control unit among the multiple valve group control units, the second communication interface of the input end of the last valve group control unit is connected to the second communication interface of the control and protection host.

[0150] like Figure 13 In the embodiment, the control and protection host includes a pair of communication interfaces (A and B), which include a first communication interface A and a second communication interface B. Each valve group control unit includes a pair of input end communication interfaces (A and B), which include a first communication interface B and a second communication interface A. The control and protection host and multiple valve group control units adopt a ring network communication connection as follows: the first communication interface A of the control and protection host is connected to the first communication interface B of the input end of the first valve group control unit, the second communication interface A of the input end of the first valve group control unit is connected to the first communication interface B of the input end of the second valve group control unit, the second communication interface A of the input end of the second valve group control unit is connected to the first communication interface B of the input end of the third valve group control unit, and so on until the last valve group control unit among the multiple valve group control units, the second communication interface A of the input end of the last valve group control unit is connected to the second communication interface B of the control and protection host, thereby forming a ring network.

[0151] In a preferred embodiment, when the control and protection host is connected to multiple valve group control units using point-to-point communication, the control and protection host includes multiple pairs of communication interfaces, each pair of communication interfaces includes a first communication interface and a second communication interface, each pair of the communication interfaces is point-to-point connected to one of the valve group control units, and each of the valve group control units includes a pair of input end communication interfaces, and the pair of input end communication interfaces includes a first communication interface and a second communication interface, wherein the control and protection host is connected to multiple valve group control units using point-to-point communication as follows: the first communication interface in each pair of communication interfaces of the control and protection host is connected to the first communication interface of the corresponding valve group control unit, and the second communication interface of the corresponding valve group control unit is connected to the second communication interface in the communication interface corresponding to the control and protection host.

[0152] like Figure 14 In the embodiment, the control and protection host includes multiple pairs of communication interfaces (three pairs of communication interfaces A and B are schematically shown in the figure), each pair of communication interfaces includes a first communication interface A and a second communication interface B, and each pair of communication interfaces is point-to-point connected to a valve group control unit, such as Figure 14 In the figure, the first pair of communication interfaces on the left side of the control and protection host corresponds to the first valve group control unit on the left side of the figure, the second pair of communication interfaces on the left side of the control and protection host corresponds to the second valve group control unit on the left side of the figure, and the third pair of communication interfaces on the left side of the control and protection host corresponds to the third valve group control unit on the left side of the figure. Each valve group control unit includes an input communication interface (A and B), and the input communication interface includes a first communication interface B and a second communication interface A. The control and protection host and multiple valve group control units adopt a point-to-point communication connection as follows: the first communication interface A in each pair of communication interfaces of the control and protection host is connected to the first communication interface B of the corresponding valve group control unit, and the second communication interface A of the corresponding valve group control unit is connected to the second communication interface B in the communication interface corresponding to the control and protection host, thereby forming a point-to-point connection between the control and protection host and each valve group control unit.

[0153] In a preferred embodiment, each power module includes a first communication interface and a second communication interface, and each pair of output end communication interfaces of each valve group control unit is connected to at least one power module in a ring network communication connection manner: the first communication interface of the output end of the valve group control unit is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, and the second communication interface of the second power module is connected to the first communication interface of the third power module, and so on until the last power module among the multiple power modules, and the second communication interface of the last power module is connected to the second communication interface of the output end of the valve group control unit.

[0154] like Figure 13 and14 As shown in the figure, each power module includes a first communication interface B and a second communication interface A, and each pair of output end communication interfaces (A1 and B1, A2 and B2...An and Bn) of each valve group control unit is connected to multiple power modules in a ring network communication connection manner. For example, the first communication interface A1 at the output end of the first valve group control unit on the left side of the figure is connected to the first communication interface B of the first power module, the second communication interface A of the first power module is connected to the first communication interface B of the second power module, and the second communication interface A of the second power module is connected to the first communication interface B of the third power module, and so on until the last power module among the multiple power modules, and the second communication interface A of the last power module is connected to the second communication interface B of the output end of the valve group control unit, thereby forming a ring network connection.

[0155] Figure 15 The flowchart of the ring network communication synchronization method according to a preferred embodiment of the present invention is shown in FIG. Figure 7 As shown, a host device and N slave devices are included, where N is at least 1. The host device and the N slave devices each include a first communication interface A and a second communication interface B. The host device and the N slave devices are sequentially connected through their respective communication interfaces to form a ring network. A message is sent by the first communication interface A of the host device and transmitted through the N slave devices to the second communication interface B of the host device, thereby forming a first ring network. A message is sent by the second communication interface B of the host device and transmitted through the N slave devices to the first communication interface A of the host device, thereby forming a second ring network. The ring network communication synchronization method of the present invention is applied to a ring network communication network in a ring network communication topology structure of a power electronic device as described in any one of the present inventions, and comprises the steps of:

[0156] S100, calculating the delay compensation value of the slave in the first ring network according to the total delay of the first ring network and the specific delay of each slave receiving the host message through the first ring network, and calculating the delay compensation value of the slave in the second ring network according to the total delay of the second ring network and the specific delay of each slave receiving the host message through the second ring network, wherein the total delay of the first ring network is the delay of the Nth slave receiving the message sent by the host, and the delay of the Nth slave receiving the message sent by the host is equal to the sum of the forwarding delays from the first slave to the N-1th slave, and the total delay of the second ring network is the delay of the first slave receiving the message sent by the host, and the delay of the first slave receiving the message sent by the host is equal to the sum of the forwarding delays from the Nth slave to the second slave;

[0157] S200, when each slave uses the received master message to perform task synchronization, when the master message is transmitted through the first ring network, the synchronization time of the current slave is the time when the current slave receives the master message plus the delay compensation value of the current slave in the first ring network; when the master message is transmitted through the second ring network, the synchronization time of the current slave is the time when the current slave receives the master message plus the delay compensation value of the current slave in the second ring network.

[0158] For example, in the first ring network, the total delay of the first ring network is T, and the n The specific delay for a slave to receive the master message is t 1. Specific delay t 1 is the first to n-1 The sum of the forwarding delays of the slaves, then n The delay compensation value of each slave is Δt 1 for Tt 1. When n When a slave uses the received master message to synchronize tasks, the n The time it takes for a slave to receive a message from the master is t 2, no. n A slave will not receive the message at the time t 2 to perform task synchronization, but in t 2 +Δt The task synchronization is performed at time 1, thereby achieving the task synchronization execution of all slaves in the first ring network. The synchronization principle of the second ring network is the same and will not be repeated here.

[0159] by Figure 4The ring network between the control protection host (set A) and the first valve group control unit group in the A-phase valve group control unit concentration is used as an example for explanation, wherein the control protection host (set A) is the host in the ring network communication synchronization method, and each valve group control unit (set A) in the first valve group control unit group in the A-phase valve group control unit concentration is a plurality of slaves in the ring network communication synchronization method. Each pair of communication interfaces in the control protection host (set A) includes a first communication interface A and a second communication interface B, and each valve group control unit (set A) in the first valve group control unit group in the A-phase valve group control unit concentration also includes The control and protection host (set A) and each valve group control unit (set A) are sequentially connected via their respective communication interfaces to form a ring network. Messages are sent from the first communication interface A of the control and protection host (set A) and transmitted through each valve group control unit (set A) to the second communication interface B of the control and protection host (set A), thereby forming a first ring network. Messages are sent from the second communication interface B of the control and protection host (set A) and transmitted through each valve group control unit (set A) to the first communication interface A of the control and protection host (set A), thereby forming a second ring network. When the valve group control units in this ring network perform task synchronization, they can perform task synchronization according to the ring network communication synchronization method of the present invention.

[0160] The ring network communication synchronization method of the present invention calculates the total communication delay of each ring network and the delay compensation value of each slave device, and then synchronizes the ring network based on the delay compensation value of each slave device. All slave devices in the entire ring network synchronize their tasks to the synchronization time obtained by adding the total delay to the master device's message transmission time, achieving the same master and slave task synchronization effect as in a point-to-point network structure. Furthermore, the master can automatically diagnose the integrity of the two ring networks in the current network by checking the number of messages received by its own port. By monitoring the number of messages sent by each slave device through the first and second ring networks, it is also possible to determine the location of communication link disconnection in the event of a network failure.

[0161] In a preferred embodiment, each slave device has the same forwarding delay for messages sent to the master. In a specific embodiment, the forwarding delay can also be known and fixed. In this case, each slave device can delay processing received messages from the master device to achieve task synchronization between slave devices.

[0162] In a preferred embodiment, the total delay of the first ring network T 1 and the total delay of the second ring network T 2 are equal, both are (N-1)*t , t For each slave's forwarding delay, N is the number of slave nodes in the ring network; the delay compensation value of the slave in the first ring network is Δt1. The delay compensation value of the slave in the second ring network is Δt 2, Δt 1 =T- ( n -1) *t, Δt 2 =T-(Nn)*t , n For the n The number of the slave.

[0163] In a preferred embodiment, the maximum delay of the first ring network is the same as the maximum delay of the second ring network.

[0164] In a specific implementation, the specific delay of each slave can be determined according to the clock frequency of the ring network, so that the total delay of the first ring network and the second ring network can also be determined.

[0165] In the specific implementation of the ring network communication mentioned in the present invention, two adjacent devices in the ring network can use two optical fibers for transmission and reception, or use one optical fiber based on wavelength multiplexing or other multiplexing methods to achieve full-duplex data transmission and reception.

[0166] The present invention further discloses a computer storage medium, wherein the storage medium stores a program, wherein the program is used to be executed to implement any ring network communication synchronization method according to the present invention.

[0167] Below is Figure 16 and 17 The ring network communication synchronization method of the present invention is described by taking an example. Figure 16 As shown in the figure, the ring network has one master device and five slave devices, numbered 1 through 5. Each time a master message is forwarded by a slave device, a 100ns delay is incurred. The maximum delay in Ring A (the total delay for the first ring network) is the sum of the forwarding delays from slave 1 to slave 4, or 400ns. The maximum delay in Ring B (the total delay for the second ring network) is the sum of the forwarding delays from slave 5 to slave 2, or 400ns. Therefore, 400ns is taken as the total delay for the entire bidirectional ring network.

[0168] The delay compensation value for each slave device is as follows: For slave device 1, the forwarding delay of the master message received from Ring A is 0ns, so the compensation value in this direction is 400ns; the forwarding delay of the master message received from Ring B is 400ns, so the compensation value in this direction is 0ns. For slave device 2, the forwarding delay of the master message received from Ring A is 100ns, so the compensation value in this direction is 300ns; the forwarding delay of the master message received from Ring B is 300ns, so the compensation value in this direction is 100ns. This is analogous to the compensation values ​​for all slave devices in both directions.

[0169] At this time, each slave device can use the compensation value to obtain the task synchronization time of the bidirectional ring network. Figure 17 As shown in the figure, for slave device 1, when receiving a master message from Ring A, the synchronization time is 400ns from the current time; when receiving a master message from Ring B, the synchronization time is 0ns from the current time. For slave device 2, when receiving a master message from Ring A, the synchronization time is 300ns from the current time; when receiving a master message from Ring B, the synchronization time is 100ns from the current time. Similarly, all slave devices can obtain the task synchronization time of this bidirectional ring network when receiving a master message from either direction. This means that all slaves' tasks execute at the same time.

[0170] The present invention further discloses a ring network communication system, which includes the power electronic equipment ring network communication topology structure described in any one of the items of the present invention.

[0171] In a preferred embodiment, any ring network in the ring network communication system can adopt any ring network communication synchronization method described in the present invention.

[0172] It should be noted that the use of step numbers (letters or numbers) to refer to certain specific method steps in the present invention is solely for the purpose of descriptive convenience and brevity, and is in no way intended to limit the order of these method steps. Those skilled in the art will appreciate that the order of the relevant method steps is determined by the technology itself and should not be unduly limited by the use of step numbers.

[0173] Those skilled in the art will appreciate that, provided there is no conflict, the above preferred solutions can be freely combined and superimposed.

[0174] It should be understood that the above-mentioned embodiments are merely illustrative and non-restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that can be made by those skilled in the art to the above-mentioned details will be included in the scope of the claims of the present invention.

Claims

1. A power electronic equipment ring network communication topology structure, characterized in that: It includes a first control and protection host, a second control and protection host, multiple valve group control unit sets and multiple power modules, each of the valve group control unit sets includes a first valve group control unit group and a second valve group control unit group, each of the first valve group control unit groups includes multiple first valve group control units, each of the second valve group control unit groups includes multiple second valve group control units, the number of first valve group control units and second valve group control units in each valve group control unit set is the same, and the first valve group control unit and the second valve group control unit in each valve group control unit set form a valve group control unit pair. Each pair of communication interfaces in the first control and protection host corresponds one-to-one to each of the valve group control unit sets, and a pair of communication interfaces and a plurality of first valve group control units in the first valve group control unit group in the corresponding valve group control unit set are connected by ring network communication. Each pair of communication interfaces in the second control and protection host corresponds one-to-one to each of the valve group control unit sets, and a pair of communication interfaces and a plurality of second valve group control units in the second valve group control unit group in the corresponding valve group control unit set are connected by ring network communication. Each pair of communication interfaces in the first valve group control unit in each pair of valve group control units is connected to at least one of the power modules using a ring network communication connection, and each pair of communication interfaces in the second valve group control unit in each pair of valve group control units is connected to at least one of the power modules using a ring network communication connection, or, The output signals of the first valve group control unit and the second valve group control unit in the valve group control unit pair are selected and then connected to at least one power module through each pair of communication interfaces in a ring network communication connection manner.

2. The power electronic equipment ring network communication topology structure according to claim 1, characterized in that: The multiple valve group control unit sets are set according to the A phase, B phase and C phase of the alternating current, including a first valve group control unit set, a second valve group control unit set and a third valve group control unit set. The first valve group control unit set controls the A phase power module in the alternating current, the second valve group control unit set controls the B phase power module in the alternating current, and the third valve group control unit set controls the C phase power module in the alternating current.

3. The power electronic equipment ring network communication topology structure according to claim 1, characterized in that: The first control and protection host and the second control and protection host include multiple pairs of communication interfaces, each pair of communication interfaces includes a first communication interface and a second communication interface, and each first valve group control unit and each second valve group control unit in the plurality of valve group control units include a pair of input end communication interfaces, and the pair of input end communication interfaces includes a first communication interface and a second communication interface; Among them, the first control protection host and the multiple first valve group control units in the first valve group control unit group in each valve group control unit set adopt a ring network communication connection: the first communication interface in a pair of communication interfaces of the first control protection host is connected to the first communication interface of the input end of the first first valve group control unit of the first valve group control unit group in the corresponding valve group control unit set, the second communication interface of the input end of the first first valve group control unit is connected to the first communication interface of the input end of the second first valve group control unit, the second communication interface of the input end of the second first valve group control unit is connected to the first communication interface of the input end of the third first valve group control unit, and so on until the last first valve group control unit of the first valve group control unit group in the corresponding valve group control unit set, the second communication interface of the input end of the last first valve group control unit is connected to the second communication interface in a pair of communication interfaces of the first control protection host; The second control protection host and the multiple second valve group control units in the second valve group control unit group in each valve group control unit concentration adopt a ring network communication connection: the first communication interface in a pair of communication interfaces of the second control protection host is connected to the first communication interface of the input end of the first second valve group control unit of the second valve group control unit group in the corresponding valve group control unit concentration, the second communication interface at the input end of the first second valve group control unit is connected to the first communication interface at the input end of the second second valve group control unit, the second communication interface at the input end of the second second valve group control unit is connected to the first communication interface at the input end of the third second valve group control unit, and so on until the last second valve group control unit of the second valve group control unit group in the corresponding valve group control unit concentration, the second communication interface at the input end of the last second valve group control unit is connected to the second communication interface in a pair of communication interfaces of the second control protection host.

4. The power electronic equipment ring network communication topology structure according to claim 1, characterized in that: Each of the power modules includes a first pair of communication interfaces and a second pair of communication interfaces, the first pair of communication interfaces includes a first communication interface and a second communication interface, the second pair of communication interfaces includes a third communication interface and a fourth communication interface, each of the first valve group control units in the valve group control unit set includes multiple pairs of output end communication interfaces, and each of the second valve group control units in the valve group control unit set includes multiple pairs of output end communication interfaces; Each pair of communication interfaces in the first valve group control unit in the valve group control unit pair is connected to at least one of the power modules in a ring network communication connection manner: the first communication interface at the output end of the first valve group control unit is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, the second communication interface of the second power module is connected to the first communication interface of the third power module, and so on until the last power module, and the second communication interface of the last power module is connected to the second communication interface of the output end of the first valve group control unit; Each pair of communication interfaces in the second valve group control unit in the valve group control unit pair is connected to the at least one power module in a ring network communication connection manner: the first communication interface at the output end of the second valve group control unit is connected to the third communication interface of the first power module, the fourth communication interface of the first power module is connected to the third communication interface of the second power module, and the fourth communication interface of the second power module is connected to the third communication interface of the third power module, and so on until the last power module, and the fourth communication interface of the last power module is connected to the second communication interface at the output end of the second valve group control unit.

5. The power electronic equipment ring network communication topology structure according to claim 1, characterized in that: The output signals of the first valve group control unit and the second valve group control unit in the valve group control unit are selected and connected to at least one of the power modules through each pair of communication interfaces in a ring network communication connection manner: The first communication interface in each pair of communication interfaces is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, the second communication interface of the second power module is connected to the first communication interface of the third power module, and so on until the last power module, and the second communication interface of the last power module is connected to the second communication interface of the communication interfaces.

6. The power electronic equipment ring network communication topology structure according to claim 1, characterized in that: When each pair of communication interfaces in the first valve group control unit in the valve group control unit pair is connected to at least one of the power modules using a ring network communication connection, and each pair of communication interfaces in the second valve group control unit in the valve group control unit pair is connected to at least one of the power modules using a ring network communication connection, The valve group control unit simultaneously receives message commands from the first valve group control unit and the second valve group control unit in the valve group control unit pair to the connected power module, and executes the message command from the duty unit; The duty unit is: when the message from the first control protection host received by the first valve group control unit contains a system duty command, the first valve group control unit is the duty unit; when the message from the second control protection host received by the second valve group control unit contains a system duty command, the second valve group control unit is the duty unit.

7. The power electronic equipment ring network communication topology structure according to claim 1, characterized in that: When the output signals of the first valve group control unit and the second valve group control unit in the valve group control unit pair are selected and connected to at least one of the power modules through each pair of communication interfaces in a ring network communication connection mode, The power module receives a message command of the duty unit output by the first valve group control unit and the second valve group control unit in the valve group control unit after selecting one of the two; The duty unit is: when the message from the first control protection host received by the first valve group control unit contains a system duty command, the first valve group control unit is the duty unit; when the message from the second control protection host received by the second valve group control unit contains a system duty command, the second valve group control unit is the duty unit.

8. The power electronic equipment ring network communication topology structure according to any one of claims 1 to 7, characterized in that: The number of first valve group control units, the number of second valve group control units in each valve group control unit group, and the number of power modules connected to each valve group control unit are set according to the voltage level.

9. A power electronic equipment ring network communication topology structure, characterized in that: It includes a first control and protection host, a second control and protection host, a plurality of valve group control unit sets and a plurality of power modules, each of the valve group control unit sets includes a first valve group control unit and a second valve group control unit; The first control and protection host is connected to the first valve group control unit in each valve group control unit cluster by a ring network communication connection, and the second control and protection host is connected to the second valve group control unit in each valve group control unit cluster by a ring network communication connection, or the first control and protection host is connected to the first valve group control unit in each valve group control unit cluster by a point-to-point communication connection, and the second control and protection host is connected to the second valve group control unit in each valve group control unit cluster by a point-to-point communication connection; Each of the first valve group control unit and the second valve group control unit in the valve group control unit cluster includes at least one pair of output end communication interfaces, each of the first valve group control unit is connected to at least one of the power modules via the output end communication interfaces in a ring network communication connection manner, and each of the second valve group control unit is connected to at least one of the power modules via the output end communication interfaces in a ring network communication connection manner, or, The output signals of the first valve group control unit and the second valve group control unit in each valve group control unit set are selected and then connected to at least one power module through each pair of communication interfaces in a ring network communication connection manner.

10. The power electronic equipment ring network communication topology structure according to claim 9, characterized in that: When the first control and protection host is connected to the first valve group control unit in each valve group control unit using a ring network communication, and the second control and protection host is connected to the second valve group control unit in each valve group control unit using a ring network communication, The first control and protection host and the second control and protection host each include a first communication interface and a second communication interface, and the first valve group control unit and the second valve group control unit in the plurality of valve group control units each include a pair of input end communication interfaces, and the input end communication interfaces include a first communication interface and a second communication interface; Wherein, the first control protection host and the first valve group control unit in each valve group control unit set adopt a ring network communication connection as follows: the first communication interface of the first control protection host is connected to the first communication interface of the input end of the first valve group control unit in the first valve group control unit set, the second communication interface of the input end of the first valve group control unit in the first valve group control unit set is connected to the first communication interface of the input end of the first valve group control unit in the second valve group control unit set, the second communication interface of the input end of the first valve group control unit in the second valve group control unit set is connected to the first communication interface of the input end of the first valve group control unit in the third valve group control unit set, and so on until the first valve group control unit in the last valve group control unit set, the second communication interface of the input end of the first valve group control unit in the last valve group control unit set is connected to the second communication interface of the first control protection host; The second control protection host and the second valve group control unit in each valve group control unit set adopt a ring network communication connection as follows: the first communication interface of the second control protection host is connected to the first communication interface of the input end of the second valve group control unit in the first valve group control unit set, the second communication interface of the input end of the second valve group control unit in the first valve group control unit set is connected to the first communication interface of the input end of the second valve group control unit in the second valve group control unit set, the second communication interface of the input end of the second valve group control unit in the second valve group control unit set is connected to the first communication interface of the input end of the second valve group control unit in the third valve group control unit set, and so on until the second valve group control unit in the last valve group control unit set, the second communication interface of the input end of the second valve group control unit in the last valve group control unit set is connected to the second communication interface of the second control protection host.

11. The power electronic equipment ring network communication topology structure according to claim 9, characterized in that: When the first control and protection host is connected to the first valve group control unit in each valve group control unit cluster by point-to-point communication, and the second control and protection host is connected to the second valve group control unit in each valve group control unit cluster by point-to-point communication, The first control and protection host and the second control and protection host each include multiple pairs of communication interfaces, each pair of the communication interfaces corresponds to one of the valve group control units, each pair of the communication interfaces includes a first communication interface and a second communication interface, the first valve group control unit and the second valve group control unit in the multiple valve group control units each include an input end communication interface, and the input end communication interface includes a first communication interface and a second communication interface; Wherein, the first control and protection host and the first valve group control unit in each valve group control unit set adopt point-to-point communication connection as follows: the first communication interface in each pair of communication interfaces of the first control and protection host is connected to the first communication interface of the first valve group control unit in the corresponding valve group control unit set, and the second communication interface of the first valve group control unit in the corresponding valve group control unit set is connected to the second communication interface in the corresponding communication interface of the first control and protection host; The second control and protection host and the second valve group control unit in each valve group control unit concentration adopt a point-to-point communication connection: the first communication interface in each pair of communication interfaces of the second control and protection host is connected to the first communication interface of the second valve group control unit in the corresponding valve group control unit concentration, and the second communication interface of the second valve group control unit in the corresponding valve group control unit concentration is connected to the second communication interface in the corresponding communication interface of the first control and protection host.

12. The power electronic equipment ring network communication topology structure according to claim 9, characterized in that: Each pair of output end communication interfaces of each first valve group control unit and the second valve group control unit includes a first communication interface and a second communication interface, each power module includes a first pair of communication interfaces and a second pair of communication interfaces, the first pair of communication interfaces includes a first communication interface and a second communication interface, and the second pair of communication interfaces includes a third communication interface and a fourth communication interface. Each of the first valve group control units is connected to at least one power module via the output end communication interface in a ring network communication connection manner: the first communication interface at the output end of the first valve group control unit is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, the second communication interface of the second power module is connected to the first communication interface of the third power module, and so on until the last power module, and the second communication interface of the last power module is connected to the second communication interface of the output end of the first valve group control unit; Each second valve group control unit is connected to the at least one power module via the output end communication interface using a ring network communication connection: the first communication interface of the output end of the second valve group control unit is connected to the third communication interface of the first power module, the fourth communication interface of the first power module is connected to the third communication interface of the second power module, and the fourth communication interface of the second power module is connected to the third communication interface of the third power module, and so on until the last power module, and the fourth communication interface of the last power module is connected to the second communication interface of the output end of the second valve group control unit.

13. The power electronic equipment ring network communication topology structure according to claim 9, characterized in that: The valve group control unit centrally selects the output signals of the first valve group control unit and the second valve group control unit, and then connects at least one of the power modules through each pair of communication interfaces in a ring network communication connection manner: The first communication interface in each pair of communication interfaces is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, the second communication interface of the second power module is connected to the first communication interface of the third power module, and so on until the last power module, and the second communication interface of the last power module is connected to the second communication interface of the communication interfaces.

14. The power electronic equipment ring network communication topology structure according to claim 9, characterized in that: When each of the first valve group control units is connected to at least one of the power modules via the output end communication interface in a ring network communication connection manner, and each of the second valve group control units is connected to at least one of the power modules via the output end communication interface in a ring network communication connection manner, The power module connected to each valve group control unit simultaneously receives the message commands of the first valve group control unit and the second valve group control unit in the valve group control unit center, and executes the message commands of the duty unit; The duty unit is: when the message from the first control protection host received by the first valve group control unit contains a system duty command, the first valve group control unit is the duty unit; when the message from the second control protection host received by the second valve group control unit contains a system duty command, the second valve group control unit is the duty unit.

15. The power electronic equipment ring network communication topology structure according to claim 9, characterized in that: When the output signals of the first valve group control unit and the second valve group control unit in each valve group control unit are selected and connected to at least one power module through each pair of communication interfaces in a ring network communication connection mode, The power module receives a message command of the duty unit output by the first valve group control unit and the second valve group control unit in the valve group control unit after selecting one of the two; The duty unit is: when the message from the first control protection host received by the first valve group control unit contains a system duty command, the first valve group control unit is the duty unit; when the message from the second control protection host received by the second valve group control unit contains a system duty command, the second valve group control unit is the duty unit.

16. The power electronic equipment ring network communication topology structure according to any one of claims 9 to 15, characterized in that: Set the number of power modules connected to each valve group control unit according to the voltage level.

17. A power electronic equipment ring network communication topology structure, characterized in that: It includes a control and protection host, multiple valve group control unit groups and multiple power modules, each of the valve group control unit groups includes multiple valve group control units, The control and protection host includes multiple pairs of communication interfaces, each pair of communication interfaces corresponds to each valve group control unit group one by one, and the control and protection host is connected to the valve group control unit in each corresponding valve group control unit group through each pair of communication interfaces using a ring network communication; Each of the valve group control units includes multiple pairs of output end communication interfaces, and each pair of the output end communication interfaces is connected to at least one of the power modules in a ring network communication connection manner; Each pair of communication interfaces of the control and protection host includes a first communication interface and a second communication interface, and each of the valve group control units includes a pair of input end communication interfaces, and the input end communication interfaces include a first communication interface and a second communication interface; The control and protection host is connected to the valve group control unit in each corresponding valve group control unit group through each pair of communication interfaces using a ring network communication connection: the first communication interface in a pair of communication interfaces of the control and protection host is connected to the first communication interface of the input end of the first valve group control unit in the corresponding valve group control unit group, the second communication interface at the input end of the first valve group control unit is connected to the first communication interface at the input end of the second valve group control unit, the second communication interface at the input end of the second valve group control unit is connected to the first communication interface at the input end of the third valve group control unit, and so on until the last valve group control unit in the corresponding valve group control unit group, the second communication interface at the input end of the last valve group control unit is connected to the second communication interface of the control and protection host; The message is sent by the first communication interface in each pair of communication interfaces of the control and protection host, and is transmitted to the second communication interface in each pair of communication interfaces of the control and protection host through the N valve group control units in the corresponding valve group control unit group, thereby forming a first ring network; Based on the total delay of the first ring network and the specific delay of each valve group control unit in receiving the message from the control protection host through the first ring network, the delay compensation value of the valve group control unit in the first ring network is calculated. The total delay of the first ring network is the delay of the Nth valve group control unit in receiving the message sent by the control protection host. The delay of the Nth valve group control unit in receiving the message sent by the control protection host is equal to the sum of the forwarding delays from the first valve group control unit to the N-1th valve group control unit.

18. The power electronic equipment ring network communication topology structure according to claim 17, characterized in that: Each of the power modules includes a first communication interface and a second communication interface, Each pair of output end communication interfaces of each valve group control unit is connected to at least one of the power modules in a ring network communication connection manner: the first communication interface of a pair of communication interfaces at the output end of the valve group control unit is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, and the second communication interface of the second power module is connected to the first communication interface of the third power module, and so on until the last power module, and the second communication interface of the last power module is connected to the second communication interface of a pair of communication interfaces at the output end of the valve group control unit.

19. The power electronic equipment ring network communication topology structure according to claim 17, characterized in that: The multiple valve group control unit groups are set according to the A phase, B phase and C phase of the alternating current, including a first valve group control unit group, a second valve group control unit group and a third valve group control unit group. The first valve group control unit group controls the A phase power module in the alternating current, the second valve group control unit group controls the B phase power module in the alternating current, and the third valve group control unit group controls the C phase power module in the alternating current.

20. A power electronic equipment ring network communication topology structure, characterized in that: It includes a control and protection host, multiple valve group control units and multiple power modules. The control and protection host is connected to the multiple valve group control units using a ring network communication connection, or the control and protection host is connected to the multiple valve group control units using a point-to-point communication connection; Each of the valve group control units includes multiple pairs of output end communication interfaces, and each pair of the output end communication interfaces is connected to at least one power module in a ring network communication connection manner; Each of the power modules includes a first communication interface and a second communication interface, Each pair of the output end communication interfaces of each valve group control unit is connected to at least one power module in a ring network communication connection manner: the first communication interface of the output end of the valve group control unit is connected to the first communication interface of the first power module, the second communication interface of the first power module is connected to the first communication interface of the second power module, the second communication interface of the second power module is connected to the first communication interface of the third power module, and so on until the last power module among the multiple power modules, and the second communication interface of the last power module is connected to the second communication interface of the output end of the valve group control unit; The message is sent by the first communication interface of the valve group control unit and is transmitted to the second communication interface of the valve group control unit through the corresponding N power modules, thereby forming a first ring network; Based on the total delay of the first ring network and the specific delay of each power module receiving the message from the valve group control unit through the first ring network, the delay compensation value of the power module in the first ring network is calculated. The total delay of the first ring network is the delay of the Nth power module receiving the message sent by the valve group control unit. The delay of the Nth power module receiving the message sent by the valve group control unit is equal to the sum of the forwarding delays from the first power module to the N-1th power module.

21. The power electronic equipment ring network communication topology structure according to claim 20, characterized in that: When the control and protection host is connected to the multiple valve group control units using a ring network communication, the control and protection host includes a pair of communication interfaces, the pair of communication interfaces includes a first communication interface and a second communication interface, and each of the valve group control units includes a pair of input end communication interfaces, the input end communication interfaces includes a first communication interface and a second communication interface; The control and protection host and the multiple valve group control units are connected using a ring network communication connection: the first communication interface of the control and protection host is connected to the first communication interface of the input end of the first valve group control unit, the second communication interface of the input end of the first valve group control unit is connected to the first communication interface of the input end of the second valve group control unit, the second communication interface of the input end of the second valve group control unit is connected to the first communication interface of the input end of the third valve group control unit, and so on until the last valve group control unit among the multiple valve group control units, and the second communication interface of the input end of the last valve group control unit is connected to the second communication interface of the control and protection host.

22. The power electronic equipment ring network communication topology structure according to claim 20, characterized in that: When the control protection host is connected to the multiple valve group control units using point-to-point communication, the control protection host includes multiple pairs of communication interfaces, each pair of communication interfaces includes a first communication interface and a second communication interface, each pair of communication interfaces is point-to-point connected to one valve group control unit, and each valve group control unit includes a pair of input end communication interfaces, and the pair of input end communication interfaces includes a first communication interface and a second communication interface. The control and protection host and the multiple valve group control units adopt a point-to-point communication connection: the first communication interface in each pair of communication interfaces of the control and protection host is connected to the first communication interface of the corresponding valve group control unit, and the second communication interface of the corresponding valve group control unit is connected to the second communication interface in the corresponding communication interface of the control and protection host.

23. A ring network communication synchronization method, the ring network comprising a host and N slaves, wherein N is at least 1, the host and the N slaves each comprising a first communication interface and a second communication interface, the host and the N slaves being sequentially connected via their respective communication interfaces to form a ring network, a message being sent from the first communication interface of the host and transmitted through the N slaves to the second communication interface of the host, thereby forming a first ring network, and a message being sent from the second communication interface of the host and transmitted through the N slaves to the first communication interface of the host, thereby forming a second ring network, characterized in that: The method is applied to a ring network communication network in a ring network communication topology structure of a power electronic device according to any one of claims 1 to 22, and the method comprises the steps of: S100, calculating the delay compensation value of the slave in the first ring network according to the total delay of the first ring network and the specific delay of each slave receiving the host message through the first ring network, and calculating the delay compensation value of the slave in the second ring network according to the total delay of the second ring network and the specific delay of each slave receiving the host message through the second ring network, wherein the total delay of the first ring network is the delay of the Nth slave receiving the message sent by the host, and the delay of the Nth slave receiving the message sent by the host is equal to the sum of the forwarding delays from the first slave to the N-1th slave, and the total delay of the second ring network is the delay of the first slave receiving the message sent by the host, and the delay of the first slave receiving the message sent by the host is equal to the sum of the forwarding delays from the Nth slave to the second slave; S200, when each slave uses the received master message to perform task synchronization, when the master message is transmitted through the first ring network, the synchronization time of the current slave is the time when the current slave receives the master message plus the delay compensation value of the current slave in the first ring network; when the master message is transmitted through the second ring network, the synchronization time of the current slave is the time when the current slave receives the master message plus the delay compensation value of the current slave in the second ring network.

24. The ring network communication synchronization method according to claim 23, characterized in that: The forwarding delay of each slave to the message sent by the master is the same.

25. The ring network communication synchronization method according to claim 24, characterized in that: The total delay of the first ring network T 1 and the total delay of the second ring network T 2 are equal, both are (N-1)*t , t For each slave's forwarding delay, N is the number of slave nodes in the ring network; The delay compensation value of the slave in the first ring network is Δt 1, the delay compensation value of the slave in the second ring network is Δt 2, Δt 1 =T- ( n -1) *t, Δt 2 =T-(Nn)*t , n For the n The number of the slave.

26. The ring network communication synchronization method according to claim 24, characterized in that: The total delay of the first ring network is the same as the total delay of the second ring network.

27. A ring network communication system, characterized in that: The communication system includes the power electronic equipment ring network communication topology structure according to any one of claims 1 to 22.

28. The ring network communication system according to claim 27, characterized in that: Any ring network in the communication system adopts the ring network communication synchronization method as described in any one of claims 23-26.

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