Intelligent converter station secondary system

Abstract

The invention discloses an intelligent converter station secondary system, and the scheme achieves the digitization and networking of a secondary circuit through the access of a merging unit and an intelligent terminal and the transmission of signals through SV and GOOSE networks, reduces the cable wiring of the secondary circuit, greatly saves the cable work amount of a converter station, and reduces the design cost. Besides, the secondary loop is visualized and can be monitored in real time through the merging unit and the intelligent terminal, so that the maintenance efficiency of the secondary system of the converter station is greatly improved, and the intelligent degree of the secondary system of the converter station is improved.

Description

Technical Field

[0001] The present application relates to the field of smart grid technology, and in particular to a secondary system of a smart converter station. Background Art

[0002] With the construction and operation of UHV transmission channels and converter stations, the electrical connections within the power grid have become closer, and the difficulty of operation and management technology has also increased significantly. The DC control and protection system is an important device to ensure the safe and stable operation of the power grid. Any problem in its secondary circuit may cause abnormalities in the high-voltage DC system. Therefore, the design of the secondary system of the converter station is very important.

[0003] At present, the secondary system design of the converter station still follows the practice of conventional substations, that is, the control and protection devices and primary equipment are connected by cables, and signals are transmitted through cables.

[0004] However, this makes the cable engineering volume large and is not conducive to cable path planning, and it is also impossible to monitor the secondary circuit. Therefore, the existing converter station secondary system design scheme has the problems of high design cost and low intelligence. Summary of the invention

[0005] The present application aims to at least solve the technical problems existing in the prior art. To this end, the first aspect of the present application proposes an intelligent converter station secondary system, characterized in that the system includes a measurement system secondary circuit module of the converter station and a switch quantity secondary circuit module of the primary equipment, wherein:

[0006] The secondary circuit module of the measurement system includes at least one set of merging units, wherein the set of merging units includes a set of AC merging units and a set of DC merging units;

[0007] The switch quantity secondary circuit module includes a switch quantity input submodule and a switch quantity output submodule. The switch quantity input submodule and the switch quantity output submodule correspond to at least one set of intelligent terminals. The intelligent terminal and the control and protection device are connected through the process layer GOOSE network communication. The intelligent terminal corresponding to the switch quantity input submodule respectively connects the signal of the target measurement position of the primary equipment to the corresponding control and protection device through the GOOSE network; the switch quantity output submodule sends the control command of the control and protection device to the corresponding intelligent terminal, so that the intelligent terminal controls the primary equipment based on the control command.

[0008] In a possible implementation, the AC merging unit adopts the IEC 61850SV protocol and is connected to the AC protection device through a point-to-point communication method, and the maximum sampling frequency is 4ksps.

[0009] In a possible implementation, the DC merging unit adopts the IEC 60044-8FT3 protocol and is connected to the DC control protection device through a point-to-point communication method, and the sampling frequency is 50ksps.

[0010] In a possible implementation, if there are two sets of smart terminals, including a first smart terminal and a second smart terminal, the control and protection device includes a first control and protection device and a second control and protection device, and the GOOSE network includes a first GOOSE network and a second GOOSE network, wherein:

[0011] The first intelligent terminal corresponding to the switch input submodule connects the signal of the target measurement position of the primary equipment to the first control protection device via the first GOOSE network, and the second intelligent terminal connects the signal of the target measurement position of the primary equipment to the second control protection device via the second GOOSE network.

[0012] In a possible implementation, the switch output submodule includes an AC circuit breaker tripping circuit, wherein:

[0013] The switch output submodule sends the tripping command of the first control protection device to the first intelligent terminal through the first GOOSE network, so that the first intelligent terminal performs a tripping coil operation of the first group of switches in the tripping circuit of the AC circuit breaker based on the tripping command;

[0014] The switch output submodule sends the tripping command of the second control protection device to the second intelligent terminal through the second GOOSE network, so that the second intelligent terminal performs a tripping coil operation of the second group of switches in the tripping circuit of the AC circuit breaker based on the tripping command.

[0015] In a possible implementation, the switch output submodule includes a DC fast switch opening and closing control circuit, wherein:

[0016] The switch output submodule sends the trip command or closing command of the first control protection device to the first intelligent terminal through the first GOOSE network, so that the first intelligent terminal performs the tripping or closing coil operation of the first group of switches in the opening and closing control loop of the DC fast switch based on the trip command or closing command;

[0017] The switch quantity output submodule sends the tripping command or closing command of the second control protection device to the second intelligent terminal through the second GOOSE network, so that the second intelligent terminal performs the tripping or closing coil operation of the second group of switches in the opening and closing control loop of the DC fast switch based on the tripping command or closing command.

[0018] In a possible implementation, the switch output submodule further includes an AC circuit breaker closing circuit, and the second intelligent terminal is connected to the first intelligent terminal through hard wiring, wherein:

[0019] The switch output submodule sends the closing command of the first control protection device to the first intelligent terminal through the first GOOSE network, and sends the closing command of the second control protection device to the second intelligent terminal through the second GOOSE network, so that the first intelligent terminal and the second intelligent terminal close the switch single combination switching coil in the closing circuit of the AC circuit breaker based on the closing command.

[0020] In a possible implementation, the switch output submodule further includes a switch opening and closing control circuit, and the second intelligent terminal is connected to the first intelligent terminal through hard wiring, wherein:

[0021] The switch output submodule sends the tripping command or closing command of the first control protection device to the first intelligent terminal through the first GOOSE network, and sends the tripping command or closing command of the second control protection device to the second intelligent terminal through the second GOOSE network, so that the first intelligent terminal and the second intelligent terminal can trip or close the single group closing coil of the knife switch in the opening and closing control circuit of the knife switch based on the tripping command or closing command.

[0022] In a possible implementation, if there are three sets of intelligent terminals, including a first intelligent terminal, a second intelligent terminal and a third intelligent terminal, the control protection device includes a first control protection device, a second control protection device and a third control protection device, the GOOSE network includes a first GOOSE network, a second GOOSE network and a third GOOSE network, the switch output submodule corresponds to a first logic judgment device and a second logic judgment device, and the first logic judgment device and the second logic judgment device are used to output a control command according to a preset three-out-of-two judgment logic, wherein,

[0023] The first intelligent terminal corresponding to the switch quantity input submodule connects the signal of the target measurement position of the primary equipment to the first control and protection device via the first GOOSE network, the second intelligent terminal connects the signal of the target measurement position of the primary equipment to the second control and protection device via the second GOOSE network, and the third intelligent terminal connects the signal of the standby measurement position of the primary equipment to the third control and protection device via the third GOOSE network.

[0024] In a possible implementation, the switch output submodule includes an AC circuit breaker tripping circuit and a DC fast switch opening control circuit, wherein:

[0025] The first control protection device, the second control protection device and the third control protection device send the trip command to the first logic judgment device and the second logic judgment device respectively, and the first logic judgment device and the second logic judgment device output the trip command according to the preset three-out-of-two judgment logic; wherein the preset three-out-of-two judgment logic is that the trip command can only be issued when receiving commands from any two control protection devices among the first control protection device, the second control protection device and the third control protection device;

[0026] The switch output submodule sends the tripping command of the first logic judgment device to the first intelligent terminal through the first GOOSE network, so that the first intelligent terminal performs the operation of the first group of tripping coils of the switch in the tripping circuit of the AC circuit breaker or the operation of the first group of tripping coils of the switch in the opening control circuit of the DC fast switch based on the tripping command;

[0027] The switch output submodule sends the tripping command of the second logic judgment device to the second intelligent terminal through the second GOOSE network, so that the second intelligent terminal operates the second group of tripping coils of the switch in the tripping circuit of the AC circuit breaker based on the tripping command, or operates the second group of tripping coils of the switch in the opening control circuit of the DC fast switch.

[0028] The embodiments of the present application have the following beneficial effects:

[0029] The intelligent converter station secondary system provided by the embodiment of the present application includes: the measurement system secondary circuit module of the converter station and the switch quantity secondary circuit module of the primary equipment, the measurement system secondary circuit module includes at least one set of merging units, and a set of merging units includes a group of AC merging units and a group of DC merging units. The switch quantity secondary circuit module includes a switch quantity input submodule and a switch quantity output submodule, the switch quantity input submodule and the switch quantity output submodule correspond to at least one set of intelligent terminals, the intelligent terminal and the control and protection device are connected through the process layer GOOSE network communication, the intelligent terminal corresponding to the switch quantity input submodule respectively connects the signal of the target measurement position of the primary equipment to the corresponding control and protection device through the GOOSE network; the switch quantity output submodule sends the control command of the control and protection device to the corresponding intelligent terminal, so that the intelligent terminal controls the primary equipment based on the control command. This solution realizes the digitization and networking of the secondary circuit by connecting to intelligent terminals, merging units and transmitting signals through GOOSE and SV networks, reducing the cable wiring of the secondary circuit, greatly saving the cable engineering workload of the converter station and reducing the design cost; in addition, the secondary circuit is visualized and can be monitored in real time through intelligent terminals and merging units, which greatly improves the efficiency of the inspection and maintenance of the secondary system of the converter station, thereby improving the intelligence level of the secondary system of the converter station. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A framework diagram of a secondary system of an intelligent converter station provided in an embodiment of the present application;

[0031] Figure 2 A schematic diagram of a merging unit provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram of two sets of intelligent terminals provided in an embodiment of the present application;

[0033] Figure 4 A schematic diagram of three sets of intelligent terminals provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] The terms used in this application are only for the purpose of describing specific embodiments, and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The singular forms of "a", "said" and "the" used in this application specification and the attached claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items. In the description of the embodiments of the present application, it is necessary to understand that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present application.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the embodiments of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the embodiments of the present application are for illustrative purposes only and are not intended to be the only implementation method.

[0040] At present, the secondary system design of the converter station still follows the practice of conventional substations. Conventional electromagnetic transformers use analog sampling and are connected to the control and protection device through cables. Only some electronic transformers in the DC field convert the collected analog quantities into digital quantities and send them to the control and protection device through the IEC60044-8 bus. The switch quantity signal acquisition and the opening and closing control circuits of primary equipment such as switches and knife switches are connected to the control and protection device through cables. However, the existing secondary system design scheme of the converter station uses a large amount of cables, has a high cable investment, and is not conducive to the path planning of cable trenches and cable shafts in the station; in addition, a large number of secondary circuits are connected through cables and electrical signals, which cannot realize the intelligence of the secondary circuits, establish virtual circuit models, and realize real-time monitoring and visualization of the secondary circuits. Therefore, the existing secondary system design scheme of the converter station has the problems of high design cost and low intelligence.

[0041] Based on this, the present application provides an intelligent converter station secondary system, which realizes the digitization and networking of the secondary circuit by connecting to the intelligent terminal, merging unit and transmitting the signal through GOOSE and SV networks, reduces the cable wiring of the secondary circuit, greatly saves the cable engineering amount of the converter station and reduces the design cost; in addition, the secondary circuit is visualized and can be monitored in real time through the intelligent terminal and merging unit, so that the efficiency of the inspection and maintenance of the secondary system of the converter station is greatly improved, thereby improving the intelligence level of the secondary system of the converter station.

[0042] Figure 1 A framework diagram of a secondary system of an intelligent converter station provided in an embodiment of the present application, the system includes a measurement system secondary circuit module of the converter station and a switch quantity secondary circuit module of a primary device, wherein the measurement system secondary circuit module includes at least one set of merging units, and a set of merging units includes a set of AC merging units and a set of DC merging units.

[0043] Among them, Figure 2 As shown, Figure 2 A schematic diagram of a merging unit provided in an embodiment of the present application, wherein the AC merging unit may be a merging unit for AC protection, and the merging unit is a physical unit for performing time-dependent combination of current or voltage data from a secondary converter, that is, Figure 2 The AC merging unit MU-AC in.

[0044] In some optional embodiments, the AC merging unit adopts the IEC 61850SV protocol and is connected to the AC protection device through a point-to-point communication method, and the maximum sampling frequency is 4ksps. Among them, the IEC 61850 protocol is a global standard in the field of power system automation, which realizes the standardization of engineering operations of smart substations. The IEC 61850 protocol includes a sampled value (SV) protocol. The SV protocol is based on multicast Ethernet and is used to transmit various collected data. Optionally, a single AC merging unit can collect 6 current and 6 voltage signals.

[0045] The DC merging unit can be a merging unit for DC control protection, that is, Figure 2 In some optional embodiments, the DC merging unit adopts the IEC 60044-8 FT3 protocol and is connected to the DC control protection device through a point-to-point communication method, and the sampling frequency is 50ksps. Among them, the IEC 60044-8 protocol is a standard for electronic transformers formulated by the International Electrotechnical Commission, and FT3 is a link layer transmission frame format specified by the IEC60044-8 protocol. The FT3 frame format includes 3 data blocks. Optionally, a single DC merging unit can collect 3 current and 3 voltage signals.

[0046] The switch quantity secondary circuit module includes a switch quantity input submodule and a switch quantity output submodule. The switch quantity input submodule and the switch quantity output submodule correspond to at least one set of intelligent terminals. The intelligent terminal and the control and protection device are connected through the process layer GOOSE network communication. The intelligent terminal corresponding to the switch quantity input submodule respectively connects the signal of the target measurement position of the primary equipment to the corresponding control and protection device through the GOOSE network; the switch quantity output submodule sends the control command of the control and protection device to the corresponding intelligent terminal, so that the intelligent terminal controls the primary equipment based on the control command.

[0047] Among them, GOOSE network refers to the general object-oriented substation event, which is a fast message transmission mechanism used to transmit important real-time signals between receiving intelligent terminals in the substation. GOOSE uses network signals to replace the hard-wired communication method between conventional substation devices, greatly simplifying the secondary cable wiring of the substation.

[0048] Optionally, if there are two sets of smart terminals, including a first smart terminal and a second smart terminal, the control and protection device includes a first control and protection device and a second control and protection device, and the GOOSE network includes a first GOOSE network and a second GOOSE network, wherein the first smart terminal corresponding to the switch input submodule connects the signal of the target measurement position of the primary equipment to the first control and protection device via the first GOOSE network, and the second smart terminal connects the signal of the target measurement position of the primary equipment to the second control and protection device via the second GOOSE network.

[0049] Among them, when designing the switch quantity secondary circuit module of the primary equipment, the primary equipment such as switches and knife switches are equipped with intelligent terminals at intervals, and the process layer GOOSE network is used to connect the intelligent terminals to the control and protection equipment. The networking method of the process layer network is that the process layer network should configure dual networks for each set of protection and control redundancy, and independently network according to the equipment area, independent network of converter transformers, independent network of DC fields, independent network of station power systems, and independent network of AC fields according to voltage levels.

[0050] like Figure 3 As shown, Figure 3 A schematic diagram of two sets of intelligent terminals provided in an embodiment of the present application. When the DC protection adopts a dual configuration, the process layer GOOSE network needs to adopt an A1 / A2 and B1 / B2 dual configuration, and the corresponding interval intelligent terminal adopts a dual configuration. Figure 3 The first GOOSE network includes the GOOSE A1 network and the GOOSE A2 network, the first control and protection device includes the DC control A and the DC protection A, and the first intelligent terminal is the intelligent terminal A. The second GOOSE network includes the GOOSE B1 network and the GOOSE B2 network, the second control and protection device includes the DC control B and the DC protection B, and the second intelligent terminal is the intelligent terminal B.

[0051] In some optional embodiments, the switch output submodule includes an AC circuit breaker tripping circuit, wherein the switch output submodule sends a tripping command of the first control protection device to the first intelligent terminal through the first GOOSE network, so that the first intelligent terminal performs a tripping operation of the first group of tripping coils of the switch in the AC circuit breaker tripping circuit based on the tripping command. The switch output submodule sends a tripping command of the second control protection device to the second intelligent terminal through the second GOOSE network, so that the second intelligent terminal performs a tripping operation of the second group of tripping coils of the switch in the AC circuit breaker tripping circuit based on the tripping command.

[0052] Among them, for the AC circuit breaker tripping circuit, the tripping command of the first control protection device is sent to the intelligent terminal A through the GOOSE A1 network and the GOOSE A2 network, so that the intelligent terminal A can perform the first set of tripping coil operations of the switch in the AC circuit breaker tripping circuit based on the tripping command. The tripping command of the second control protection device is sent to the intelligent terminal B through the GOOSE B1 network and the GOOSE B2 network, so that the intelligent terminal B can perform the second set of tripping coil operations of the switch in the AC circuit breaker tripping circuit based on the tripping command.

[0053] In some other optional embodiments, the switch output submodule includes a switch opening and closing control circuit of a DC fast switch, wherein the switch output submodule sends a trip command or a closing command of a first control protection device to a first intelligent terminal through a first GOOSE network, so that the first intelligent terminal performs a first group of tripping or closing coil operations of switches in the switch opening and closing control circuit of the DC fast switch based on the trip command or the closing command. The switch output submodule sends a trip command or a closing command of a second control protection device to a second intelligent terminal through a second GOOSE network, so that the second intelligent terminal performs a second group of tripping or closing coil operations of switches in the switch opening and closing control circuit of the DC fast switch based on the trip command or the closing command.

[0054] Please continue to refer to Figure 3 , for the opening and closing control circuit of the DC fast switch, since the DC field fast switch generally has two groups of closing coils, the control method of the opening and closing control circuit of the DC fast switch is consistent with that of the tripping circuit of the AC circuit breaker. Specifically, the switch output submodule sends the trip command or closing command of the first control protection device to the intelligent terminal A through the GOOSE A1 network and the GOOSE A2 network, so that the intelligent terminal A can perform the first group of tripping or closing coil operations of the switch in the opening and closing control circuit of the DC fast switch based on the trip command or closing command. The switch output submodule sends the trip command or closing command of the second control protection device to the intelligent terminal B through the GOOSE B1 network and the GOOSE B2 network, so that the intelligent terminal B can perform the second group of tripping or closing coil operations of the switch in the opening and closing control circuit of the DC fast switch based on the trip command or closing command.

[0055] In some other optional embodiments, the switch output submodule also includes an AC circuit breaker closing circuit, and the second intelligent terminal is connected to the first intelligent terminal through hard wiring, wherein the switch output submodule sends the closing command of the first control protection device to the first intelligent terminal through the first GOOSE network, and sends the closing command of the second control protection device to the second intelligent terminal through the second GOOSE network, so that the first intelligent terminal and the second intelligent terminal close the switch single combination switching coil in the AC circuit breaker closing circuit based on the closing command.

[0056] Please continue to refer to Figure 3 For the AC circuit breaker closing circuit, the closing command of the first control protection device is sent to the intelligent terminal A through the GOOSE A1 network and the GOOSE A2 network, and the closing command of the second control protection device is sent to the intelligent terminal B through the GOOSE B1 network and the GOOSE B2 network. The intelligent terminal B is connected to the intelligent terminal A through hard wiring, thereby forming a complete AC circuit breaker closing circuit, so that the intelligent terminal A and the intelligent terminal B close the switch single combination brake coil in the AC circuit breaker closing circuit based on the closing command.

[0057] In other optional embodiments, the switch output submodule also includes a switch opening and closing control circuit, and the second intelligent terminal is connected to the first intelligent terminal through hard wiring, wherein the switch output submodule sends the tripping command or closing command of the first control protection device to the first intelligent terminal through the first GOOSE network, and sends the tripping command or closing command of the second control protection device to the second intelligent terminal through the second GOOSE network, so that the first intelligent terminal and the second intelligent terminal can trip or close the single group of closing coils of the knife switch in the switch opening and closing control circuit based on the tripping command or closing command.

[0058] Please continue to refer to Figure 3 , for the opening and closing control circuit of the knife switch, since the knife switch generally has only a single group of closing coils, the control method of the opening and closing control circuit of the knife switch is consistent with the control method of the closing circuit of the AC circuit breaker. The switch output submodule sends the tripping command or closing command of the first control protection device to the intelligent terminal A through the GOOSE A1 network and the GOOSE A2 network, and sends the tripping command or closing command of the second control protection device to the intelligent terminal B through the GOOSE B1 network and the GOOSE B2 network. The intelligent terminal B is connected to the intelligent terminal A through hard wiring, thereby forming a complete opening and closing circuit of the knife switch, so that the intelligent terminal A and the intelligent terminal B can trip or close the single group of closing coils of the knife switch in the opening and closing control circuit of the knife switch based on the tripping command or the closing command.

[0059] In some other optional embodiments, if there are three sets of intelligent terminals, including the first intelligent terminal, the second intelligent terminal and the third intelligent terminal, the control protection device includes the first control protection device, the second control protection device and the third control protection device, the GOOSE network includes the first GOOSE network, the second GOOSE network and the third GOOSE network, the switch output submodule corresponds to the first logic judgment device and the second logic judgment device, and the first logic judgment device and the second logic judgment device are used to output control commands according to the preset three-out-of-two judgment logic. Among them, the first intelligent terminal corresponding to the switch input submodule connects the signal of the target measurement position of the primary equipment to the first control protection device via the first GOOSE network, the second intelligent terminal connects the signal of the target measurement position of the primary equipment to the second control protection device via the second GOOSE network, and the third intelligent terminal connects the signal of the standby measurement position of the primary equipment to the third control protection device via the third GOOSE network.

[0060] Among them, when the DC protection adopts triple configuration, the process layer GOOSE network needs to adopt A1 / A2, B1 / B2, C1 / C2 triple configuration, and the corresponding interval intelligent terminal adopts triple configuration. In order to meet the needs of triple DC protection switch input, mainly the closing / opening signal of the circuit breaker / knife switch, the GOOSE C1 / C2 network is added on the basis of the GOOSE A1 / A2 and B1 / B2 networks, and the signal of the standby measurement position of the circuit breaker / knife switch of the primary equipment is connected to the intelligent terminal C, and connected to the third control protection device through the GOOSE C1 / C2 network. The switch input circuit of the first control protection device and the second control protection device is consistent with the design scheme of the dual configuration.

[0061] like Figure 4 As shown, Figure 4 A schematic diagram of three sets of intelligent terminals provided for an embodiment of the present application. Among them, when the DC protection is independently configured in a tripling manner, the tripping mode of the DC protection adopts a preset three-out-of-two judgment logic to output a control command, and the control command includes a tripping command. That is, a "three-out-of-two" logic output is adopted, two sets of "three-out-of-two" devices are configured, and three sets of DC protection are connected to two sets of "three-out-of-two" devices at the same time. When two sets of the same type of protection actions among the three sets of protection are judged to be correct actions, the "three-out-of-two" device will output a control command for locking or tripping. The tripping command of the "three-out-of-two" device is sent to the corresponding intelligent terminal via the GOOSE network, and the device is controlled to be tripped through the intelligent terminal.

[0062] like Figure 4, the first logic judgment device is a three-out-of-two device A, and the second logic judgment device is a three-out-of-two device B. The first GOOSE network includes the GOOSE A1 network and the GOOSE A2 network, the first control and protection device includes DC control A and DC protection A, and the first intelligent terminal is intelligent terminal A. The second GOOSE network includes the GOOSE B1 network and the GOOSE B2 network, the second control and protection device includes DC control B and DC protection B, and the second intelligent terminal is intelligent terminal B. The third GOOSE network includes the GOOSE C1 network and the GOOSE C2 network, the third control and protection device includes DC protection C, and the third intelligent terminal is intelligent terminal C.

[0063] Thus, the intelligent terminal A corresponding to the switch input submodule connects the signal of the target measurement position of the primary equipment to the first control and protection device via the GOOSE A1 network and the GOOSE A2 network, the intelligent terminal B connects the signal of the target measurement position of the primary equipment to the second control and protection device via the GOOSE B1 network and the GOOSE B2 network, and the intelligent terminal C connects the signal of the standby measurement position of the primary equipment to the third control and protection device via the GOOSE C1 network and the GOOSE C2 network.

[0064] In some other optional embodiments, the switch output submodule includes an AC circuit breaker tripping circuit and a DC fast switch opening control circuit, wherein the switch output submodule sends the tripping command of the first logic judgment device to the first intelligent terminal through the first GOOSE network, so that the first intelligent terminal performs a tripping operation of the first group of tripping coils of the switch in the AC circuit breaker tripping circuit based on the tripping command, or a tripping operation of the first group of tripping coils of the switch in the opening control circuit of the DC fast switch. The switch output submodule sends the tripping command of the second logic judgment device to the second intelligent terminal through the second GOOSE network, so that the second intelligent terminal performs a tripping operation of the second group of tripping coils of the switch in the AC circuit breaker tripping circuit based on the tripping command, or a tripping operation of the second group of tripping coils of the switch in the opening control circuit of the DC fast switch.

[0065] Among them, for the AC circuit breaker tripping circuit, the switch output submodule sends the tripping command of the three-out-of-two device A to the intelligent terminal A through the GOOSE A1 network and the GOOSE A2 network, so that the intelligent terminal A can trip the first set of tripping coils of the switch in the AC circuit breaker tripping circuit based on the tripping command. The switch output submodule sends the tripping command of the three-out-of-two device B to the intelligent terminal B through the GOOSE B1 network and the GOOSE B2 network, so that the intelligent terminal B can trip the second set of tripping coils of the switch in the AC circuit breaker tripping circuit based on the tripping command. For the opening control circuit of the DC fast switch, since the DC field fast switch generally has two sets of tripping coils, the opening control circuit of the DC fast switch is consistent with the control method of the AC circuit breaker tripping circuit.

[0066] The secondary system of the intelligent converter station provided in this embodiment includes: the secondary circuit module of the measurement system of the converter station and the switch quantity secondary circuit module of the primary equipment. The secondary circuit module of the measurement system includes at least one set of merging units, and a set of merging units includes a group of AC merging units and a group of DC merging units. The switch quantity secondary circuit module includes a switch quantity input submodule and a switch quantity output submodule. The switch quantity input submodule and the switch quantity output submodule correspond to at least one set of intelligent terminals. The intelligent terminal and the control and protection device are connected through the process layer GOOSE network communication. The intelligent terminal corresponding to the switch quantity input submodule connects the signal of the target measurement position of the primary equipment to the corresponding control and protection device through the GOOSE network; the switch quantity output submodule sends the control command of the control and protection device to the corresponding intelligent terminal, so that the intelligent terminal controls the primary equipment based on the control command. This solution realizes the digitization and networking of the secondary circuit by connecting to the intelligent terminal, merging unit and transmitting signals through GOOSE and SV networks, reducing the cable wiring of the secondary circuit, greatly saving the cable engineering workload of the converter station and reducing the design cost; in addition, the secondary circuit can be visualized and monitored in real time through the intelligent terminal, which greatly improves the efficiency of the inspection and operation of the secondary system of the converter station, thereby improving the intelligence level of the secondary system of the converter station.

[0067] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on the several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0068] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. An intelligent converter station secondary system, characterized in that: The system includes a secondary circuit module of a measurement system of a converter station and a switch quantity secondary circuit module of a primary device, wherein: The secondary loop module of the measurement system includes at least one set of merging units, and the set of merging units includes a set of AC merging units and a set of DC merging units; The switch quantity secondary circuit module includes a switch quantity input submodule and a switch quantity output submodule. The switch quantity input submodule and the switch quantity output submodule correspond to at least one set of intelligent terminals. The intelligent terminal is connected to the control and protection device through the process layer GOOSE network communication. The intelligent terminal corresponding to the switch quantity input submodule connects the signal of the target measurement position of the primary equipment to the corresponding control and protection device through the GOOSE network; the switch quantity output submodule sends the control command of the control and protection device to the corresponding intelligent terminal, so that the intelligent terminal controls the primary equipment based on the control command.

2. The system according to claim 1, characterized in that The AC merging unit adopts the IEC 61850SV protocol and is connected to the AC protection device through a point-to-point communication method, and the maximum sampling frequency is 4ksps.

3. The system according to claim 1 or 2, characterized in that: The DC merging unit adopts the IEC 60044-8FT3 protocol and is connected to the DC control protection device through a point-to-point communication method, and the sampling frequency is 50ksps.

4. The system according to claim 1 or 2, characterized in that: If there are two sets of smart terminals, including a first smart terminal and a second smart terminal, the control and protection device includes a first control and protection device and a second control and protection device, and the GOOSE network includes a first GOOSE network and a second GOOSE network, wherein: The first intelligent terminal corresponding to the switch input submodule connects the signal of the target measurement position of the primary equipment to the first control and protection device via the first GOOSE network, and the second intelligent terminal connects the signal of the target measurement position of the primary equipment to the second control and protection device via the second GOOSE network.

5. The system according to claim 4, characterized in that The switch output submodule includes an AC circuit breaker tripping circuit, wherein: The switch output submodule sends the tripping command of the first control protection device to the first intelligent terminal through the first GOOSE network, so that the first intelligent terminal performs an operation of tripping the first group of tripping coils of the switch in the tripping circuit of the AC circuit breaker based on the tripping command; The switch output submodule sends the tripping command of the second control protection device to the second intelligent terminal through the second GOOSE network, so that the second intelligent terminal performs an operation of tripping the second group of tripping coils of the switch in the tripping circuit of the AC circuit breaker based on the tripping command.

6. The system according to claim 4, characterized in that The switch output submodule includes a DC fast switch opening and closing control circuit, wherein: The switch output submodule sends the trip command or closing command of the first control protection device to the first intelligent terminal through the first GOOSE network, so that the first intelligent terminal performs a tripping or opening coil operation of the first group of switches in the opening and closing control circuit of the DC fast switch based on the trip command or closing command; The switch output submodule sends the tripping command or closing command of the second control protection device to the second intelligent terminal through the second GOOSE network, so that the second intelligent terminal performs tripping or opening coil operation of the second group of switches in the opening and closing control circuit of the DC fast switch based on the tripping command or closing command.

7. The system according to claim 4, characterized in that The switch output submodule further includes an AC circuit breaker closing circuit, and the second intelligent terminal is connected to the first intelligent terminal through hard wiring, wherein: The switch output submodule sends the closing command of the first control and protection device to the first intelligent terminal through the first GOOSE network, and sends the closing command of the second control and protection device to the second intelligent terminal through the second GOOSE network, so that the first intelligent terminal and the second intelligent terminal close the switch single combination switching coil in the AC circuit breaker closing circuit based on the closing command.

8. The system according to claim 4, characterized in that The switch output submodule also includes a switch opening and closing control circuit, and the second intelligent terminal is connected to the first intelligent terminal through hard wiring, wherein: The switch output submodule sends the tripping command or closing command of the first control protection device to the first intelligent terminal through the first GOOSE network, and sends the tripping command or closing command of the second control protection device to the second intelligent terminal through the second GOOSE network, so that the first intelligent terminal and the second intelligent terminal trip or close the single-group closing coil of the knife switch in the opening and closing control circuit of the knife switch based on the tripping command or closing command.

9. The system according to claim 1 or 2, characterized in that: If there are three sets of intelligent terminals, including a first intelligent terminal, a second intelligent terminal and a third intelligent terminal, the control protection device includes a first control protection device, a second control protection device and a third control protection device, the GOOSE network includes a first GOOSE network, a second GOOSE network and a third GOOSE network, the switch output submodule corresponds to a first logic judgment device and a second logic judgment device, the first logic judgment device and the second logic judgment device are used to output a control command according to a preset three-out-of-two judgment logic, wherein, The first intelligent terminal corresponding to the switch input submodule connects the signal of the target measurement position of the primary equipment to the first control and protection device via the first GOOSE network, the second intelligent terminal connects the signal of the target measurement position of the primary equipment to the second control and protection device via the second GOOSE network, and the third intelligent terminal connects the signal of the standby measurement position of the primary equipment to the third control and protection device via the third GOOSE network.

10. The system according to claim 9, characterized in that The switch output submodule includes an AC circuit breaker tripping circuit and a DC fast switch opening control circuit, wherein: The first control protection device, the second control protection device and the third control protection device send the trip command to the first logic judgment device and the second logic judgment device respectively, and the first logic judgment device and the second logic judgment device output the trip command according to the preset three-out-of-two judgment logic; wherein the preset three-out-of-two judgment logic is that the trip command can only be issued when the command of any two control protection devices among the first control protection device, the second control protection device and the third control protection device is received; The switch output submodule sends the tripping command of the first logic judgment device to the first intelligent terminal through the first GOOSE network, so that the first intelligent terminal performs the operation of tripping the first group of tripping coils of the switches in the tripping circuit of the AC circuit breaker or the operation of tripping the first group of tripping coils of the switches in the opening control circuit of the DC fast switch based on the tripping command; The switch output submodule sends the tripping command of the second logic judgment device to the second intelligent terminal through the second GOOSE network, so that the second intelligent terminal performs an operation on the second group of tripping coils of switches in the tripping circuit of the AC circuit breaker based on the tripping command, or performs an operation on the second group of tripping coils of switches in the opening control circuit of the DC fast switch.

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