Redundant device for new energy power control and control method thereof

Abstract

The invention discloses a redundancy device for new energy power control and a control method thereof. The redundancy device is composed of a real-time library unit, a main and standby data acquisition unit, a main and standby data forwarding unit, a data mapping unit, a logic control unit, a communication unit and other modules. As the new energy station requires that the power control device has a main-standby redundancy function, by judging the states of the main and standby machines and control information in real time, when the main controller is in an abnormal state, if the state of the standby machine is normal, the main and standby machines are automatically switched, and the control effects before and after switching are consistent; and the new energy station power control system is more stable and reliable. The device redundancy control method for new energy power control is suitable for grid-connected control scenes of various scales and various types of power plants.

Description

Technical Field

[0001] The present invention belongs to the technical field of power system control, and in particular relates to a redundant device for new energy power control and a control method thereof. Background Art

[0002] The power control device is the control center that ensures the stable operation, safe production, and efficient power generation of new energy power stations. It is connected to the dispatching main station, receives power generation instructions, and controls the power generation equipment to make the station power reach the instructions set by the dispatching. When the station equipment fails, it is necessary to adjust the control strategy in time to avoid impact on the power grid. Therefore, the stability and reliability of its operation are particularly important in the entire system. At present, most of the power control configurations of new energy stations are single-device operation. When the device fails, the power control of the entire station becomes unstable, which may cause abnormal power regulation of the station or failure to generate electricity. Therefore, the configuration of active and standby redundancy of the power control device can effectively improve the stability of the operation of new energy stations. Summary of the invention

[0003] In order to solve the deficiencies in the prior art, the present invention provides a redundant device for new energy power control and a control method thereof, so as to improve the stability and safety of the operation of new energy stations.

[0004] The present invention adopts the following technical solutions. A first aspect of the present invention provides a power control redundancy device for power control master-slave redundancy control of a new energy station, including a machine A and a machine B;

[0005] One of A and B is the master, and the other is the backup. A and B can switch between master and backup.

[0006] Machine A and machine B have the same structure, both of which include: real-time library unit, data acquisition unit, data forwarding unit, data mapping unit, logic control unit and communication unit;

[0007] The data acquisition unit is used to collect the information of the local machine and the counterpart machine through the communication unit, send it to the real-time library unit of the local machine, and pass it to the logic control unit;

[0008] The data forwarding unit is used to forward the local information read from the real-time library unit to the opposite machine through the communication unit, and receive it through the data acquisition unit of the opposite machine;

[0009] The logic control unit is used for active / standby switching, running the power control algorithm and generating control results;

[0010] The data mapping unit is arranged between the real-time library unit and the logic control unit, and is used to transmit the local state to the logic control unit through the mapping unit, so that the logic control unit can monitor whether the local state is normal.

[0011] Preferably, the logic control unit of the host is used to monitor that the host state is running normally, operate the control logic normally and send the control instructions to the control device normally, and at the same time, the host forwards the control instructions, function activation and deactivation commands, and host state to the standby machine through the communication unit;

[0012] The logic control unit of the standby machine is used to determine that the machine is a standby machine based on its status after receiving the synchronization data from the host machine, synchronize the host machine's control instructions and function activation and deactivation instructions to the machine, and send the locking instructions to the control device.

[0013] Preferably, the logic control unit determines whether the master-slave switching conditions are met and whether the master-slave switching can be performed based on the key data verification code, the master-slave key process, and the master-slave key status information, and runs the power control algorithm and generates a control result.

[0014] A second aspect of the present invention provides a control method for a power control redundant device, which is used to control the power control redundant device, comprising the following steps:

[0015] Step 1: Initialize the status of machine A and machine B, and set either of them as the host;

[0016] Step 2: The logic control units of the master and the backup machine determine the master and backup status, wherein the master transmits its status to the logic control unit through the mapping unit, and the logic control unit monitors the status of the master. If the master is operating normally, step 3 is executed; if the master is operating abnormally, step 4 is executed;

[0017] Step 3: The host normally sends the control command to the control device, and at the same time, the host forwards the control command, function launch and shutdown command, and host status to the standby machine through the communication unit; after the standby machine receives the synchronization data from the host, the logic control unit combines the state of the local machine, determines that the local machine is the standby machine, synchronizes the control command and function launch and shutdown command of the host to the local machine, and sends the locking command to the control device;

[0018] Step 4: Determine whether the versions of the master and standby machines are consistent and whether the standby machine is running normally; if the versions of the master and standby machines are consistent and the standby machine is running normally, the master and standby machines are switched.

[0019] Preferably, the power control redundancy device prohibits switching between the primary and standby machines when detecting a frequency modulation action signal.

[0020] Preferably, in step 1, the master-slave switching mode is set by a soft pressure plate to switch whether the master and standby machines are manually designated or compete freely.

[0021] Preferably, in step 2, the logic control unit has five levels when judging the active / standby status:

[0022] The first level is primary frequency modulation, during which no primary and standby calculations are performed;

[0023] The second level is to use the soft pressure plate to determine whether the current master and backup are manually designated or in free competition;

[0024] The third level is whether the host is powered off in the free competition mode. If the host is powered off, the standby machine will be promoted to the master immediately;

[0025] The fourth level is to determine whether the versions of the peer machine and the local machine are consistent in the free competition mode. If they are not consistent, the master-slave calculation is not performed.

[0026] The fifth level is the free competition mode, in which the status of the local machine and the opposite machine are evaluated to determine the primary and standby status of the local machine.

[0027] Preferably, in step 2, the host operation abnormality includes: abnormality of the host key task, abnormality of the device board or abnormality of the primary and standby forwarding units.

[0028] Preferably, in step 4, whether the versions of the host and standby machines are consistent is determined by the consistency of key task verification codes, as well as the consistency of programs, firmware, and configurations.

[0029] Preferably, in the free competition mode, when the host process is abnormal, the data forwarding unit of the host sends the host abnormal status to the standby machine. After the standby machine receives the host abnormal status and the local status is normal, the standby machine logic control unit upgrades the standby machine to the master; after the host receives the standby machine host status through the master-standby data acquisition unit, the local host status is downgraded to the standby machine.

[0030] The beneficial effects of the present invention also include:

[0031] In new energy stations, power control improves the stability and safety of new energy station operation by configuring master-slave redundant devices. While autonomously diagnosing and switching the master-slave status, the invention can manually specify the master-slave machine, increasing the flexibility of on-site debugging and operation. At the same time, in the invention, the control structure and configuration of machine A and machine B are consistent, which improves the convenience of the station deployment program and the fault tolerance during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of a power control redundancy device disclosed in the present application;

[0033] Figure 2 It is a schematic diagram of the operation flow of a host of a power control redundancy device disclosed in the present application;

[0034] Figure 3 The present application discloses a schematic diagram of a standby operation flow of a power control redundant device. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0036] like Figure 1 As shown, embodiment 1 of the present invention provides a power control redundancy device for active-standby redundant control of power control in a new energy station, including machine A and machine B, one of which is a master machine and the other is a standby machine; machine A and machine B can perform active-standby switching.

[0037] Machine A and machine B have the same structure, both including: a real-time library unit, a data acquisition unit, a data forwarding unit, a data mapping unit, a logic control unit and a communication unit.

[0038] The real-time library unit is a device database management unit, including real-time data of operation, access to external data, time stamp of the data, and displacement information.

[0039] In a preferred but non-limiting embodiment, the data acquisition unit of the local machine is used to collect the local machine and the paired machine information to the local machine through the communication unit, send it to the real-time library unit of the local machine, and pass it to the logic control unit. More specifically, the master / slave machine information is collected by the master / slave machine data acquisition unit to the local machine through the communication unit, and passed to the logic control unit.

[0040] The data forwarding units of machine A and machine B are used to forward the local information read from the real-time library unit to the opposite machine through the communication unit, and receive it through the data acquisition unit of the opposite machine. More specifically, the master / slave data forwarding unit forwards the master / slave information to the opposite machine through the communication unit, and the opposite machine receives it through the master / slave data acquisition unit.

[0041] The logic control units of machine A and machine B are used for master-slave switching, and run the power control algorithm and generate control results. More specifically, the logic control unit determines whether the master and standby machines are abnormal, whether the master-slave switching conditions are met, and whether the master-slave switching can be performed through the master-slave key process check code, the master-slave key process status, and the master-slave key status information, and runs the power control algorithm and generates control results.

[0042] In a further preferred but non-limiting embodiment, the host's logic control unit is used to monitor that when the host status is operating normally, it operates the control logic normally and sends the control instructions to the control device normally. At the same time, the host forwards the control instructions, function activation and deactivation commands, and host status to the standby machine through the communication unit.

[0043] The logic control unit of the standby machine is used to determine that the machine is a standby machine based on its status after receiving the synchronization data from the host machine, synchronize the host machine's control instructions and function activation and deactivation instructions to the machine, and send the locking instructions to the control device.

[0044] Control instructions include but are not limited to active power, reactive power and voltage control instructions issued by the dispatching master station; function switching instructions include but are not limited to active power control, reactive power control switching commands and commands on whether the control unit participates in control, etc.

[0045] The logic control unit of the host is also used to detect abnormal operation of the host. If the versions of the main and standby machines are consistent and the standby machine is running normally, the main and standby machine operations are switched.

[0046] In a further preferred but non-limiting embodiment, host operation abnormalities include: host critical task abnormalities, device board abnormalities or master-slave forwarding unit abnormalities; master-slave machine version consistency includes: critical task check code consistency, and program, firmware and configuration consistency.

[0047] The data mapping unit of machine A and machine B is set between the real-time library unit and the logic control unit, and is used to transmit the state of the machine to the logic control unit through the mapping unit, so that the logic control unit can monitor whether the state of the machine is normal. More specifically, the data mapping unit transmits the access data and device information required by the logic control unit, and is a bridge for the control unit to communicate with the outside.

[0048] The communication unit between machine A and machine B is the bridge for the device to interact with external information, and is used for unified management of external data access and data transfer from this device.

[0049] The power control redundant device sets the master-slave mode through a soft pressure plate, which is used to switch whether the master and standby machines are manually designated or freely competed, and can be set through the power control background configured by the power control redundant device. More specifically, manually designating the master and standby machines means that the master or standby machine can be set through the power control background configured by the power control redundant device, and the free competition mode means that the power control redundant device can freely switch the master and standby machines according to the status of the local machine and the opposite machine.

[0050] It is worth noting that the power control redundancy device prohibits the switching of the master and standby machines when detecting a primary frequency modulation action signal. It can be understood that the primary frequency modulation action signal is a primary frequency modulation function of the new energy station, that is, when the frequency fluctuation of the grid connection point is detected, the primary frequency modulation function is used to stabilize the frequency.

[0051] On this basis, in a further preferred but non-limiting embodiment, the logic control unit has five levels when judging the active and standby states:

[0052] The first level is primary frequency modulation, during which no primary and standby calculations are performed;

[0053] The second level is to use the soft pressure plate to determine whether the current master and standby are manually designated or free competition;

[0054] The third level is whether the host is powered off in the free competition mode. If the host is powered off, the standby machine will be promoted to the master immediately;

[0055] The fourth level is to determine whether the versions of the peer machine and the local machine are consistent in the free competition mode. If they are not consistent, the master-slave calculation is not performed.

[0056] The fifth level is the free competition mode, in which the status of the local machine and the opposite machine are evaluated to determine the primary and standby status of the local machine.

[0057] The equipment that performs power control is generally the active / reactive source of the new energy site, including photovoltaic inverters, wind power clusters, reactive compensation equipment, energy storage conversion equipment, energy storage energy management platform, etc.

[0058] Significantly different from the prior art, the power control redundancy device provided by the present invention quickly switches to the backup machine when an abnormality occurs in the main machine, thereby improving the stability of power control operation in the new energy station. It is worth noting that the power control redundancy device allows for a short period of dual hosts or dual backup machines to appear during the main-backup switching process.

[0059] Embodiment 2 of the present invention provides a control method for a power control redundant device, which is used to control the power control redundant device as described in Embodiment 1, and includes the following steps:

[0060] Step 1, initialize the status of machine A and machine B, and set any one of them as the master; in step 1, set the master-slave switching mode through the soft pressure plate to switch whether the master and standby machines are manually designated or freely competed.

[0061] Step 2: The logic control units of the master and the backup machine determine the master and backup status, wherein the master transmits its status to the logic control unit through the mapping unit, and the logic control unit monitors the status of the master. If the master is operating normally, step 3 is executed; if the master is operating abnormally, step 4 is executed;

[0062] It is worth noting that the power control redundancy device prohibits the switching of the master and standby machines when detecting a frequency modulation action signal.

[0063] In a preferred but non-limiting embodiment, when executing step 2, the host operation abnormality includes: abnormality of the host key task, abnormality of the device board, or abnormality of the primary and standby forwarding units.

[0064] In a preferred but non-limiting embodiment, when executing step 2, the logic control unit has five levels when judging the active and standby states:

[0065] The first level is primary frequency modulation, during which no primary and standby calculations are performed;

[0066] The second level is to use the soft pressure plate to determine whether the current master and standby are manually designated or free competition;

[0067] The third level is whether the host is powered off in the free competition mode. If the host is powered off, the standby machine will be promoted to the master immediately;

[0068] The fourth level is to determine whether the versions of the peer machine and the local machine are consistent in the free competition mode. If they are not consistent, the master-slave calculation is not performed.

[0069] The fifth level is the free competition mode, in which the status of the local machine and the opposite machine are evaluated to determine the primary and standby status of the local machine.

[0070] Step 3: The host normally sends the control command to the control device, and at the same time, the host forwards the control command, function launch and shutdown command, and host status to the standby machine through the communication unit; after the standby machine receives the synchronization data from the host, the logic control unit combines the state of the local machine, determines that the local machine is the standby machine, synchronizes the control command and function launch and shutdown command of the host to the local machine, and sends the locking command to the control device;

[0071] Step 4: Determine whether the versions of the master and standby machines are consistent and whether the standby machine is running normally; if the versions of the master and standby machines are consistent and the standby machine is running normally, the master and standby machines are switched.

[0072] In a preferred but non-limiting implementation, when executing step 4, the consistency of the key task verification code, as well as the consistency of the program, firmware, and configuration is used to determine whether the versions of the host and standby machines are consistent.

[0073] In the free competition mode, when the host process is abnormal, the data forwarding unit of the host sends the host abnormal status to the standby machine. After the standby machine receives the host abnormal status and the local status is normal, the standby machine logic control unit upgrades the standby machine to the master; after the host receives the standby machine host status through the master-standby data acquisition unit, the local host status is downgraded to the standby machine.

[0074] If in the initial state, machine A is the master and machine B is the standby, when the process of master A is abnormal, the master-standby forwarding unit of machine A sends the abnormal state of machine A to machine B. After machine B receives the abnormal state of the master and its own state is normal, the logic control unit of machine B upgrades machine B to the master; after machine A receives the master state of machine B through the master-standby data acquisition unit, it downgrades its own master state to the standby;

[0075] If in the initial state, machine B is the host and machine A is the backup machine, when the process of host B is abnormal, the master-slave forwarding unit of machine B sends the abnormal status of machine B to machine A. After machine A receives the abnormal status of the host and its own status is normal, the logic control unit of machine A upgrades machine A to the host; after machine B receives the host status of machine A through the master-slave data acquisition unit, it downgrades its own host status to the backup machine.

[0076] In order to more clearly introduce the technical solution of the present invention, the operation processes of the main machine and the standby machine are respectively introduced below. Figure 2 The figure shows the process flow diagram of the main engine operation of the power control redundant device. It includes the following steps:

[0077] Step ZJ1: the main unit of the power control device runs;

[0078] Step ZJ2: Determine whether the primary frequency modulation is activated. If the primary frequency modulation is not activated, return to step ZJ1; otherwise, proceed to step ZJ3.

[0079] Step ZJ3: Determine the main and standby operation modes. If it is manually specified, go to step ZJ4; if it is free competition mode, go to step ZJ5;

[0080] Step ZJ4: When it is manually designated as the master machine, return to step ZJ1; otherwise, it is manually designated as the backup machine, switch to the backup machine operation, and jump to step ZJ9;

[0081] Step ZJ5: Free competition mode, determine whether the other machine is powered off, if the other machine is powered off, return to step ZJ1, otherwise go to step ZJ6;

[0082] Step ZJ6: Compare the versions of the control machine and the backup machine to see if they are consistent. If they are consistent, proceed to step ZJ7. If they are inconsistent, return to step ZJ1.

[0083] Step ZJ7: Determine whether the machine has an abnormality. If no abnormality occurs, return to step ZJ1; otherwise, go to step ZJ8;

[0084] Step ZJ8: Determine whether the other machine is the master machine. If the other machine is the master machine, switch to standby machine operation and enter step ZJ9. Otherwise, return to step ZJ1.

[0085] Step ZJ9: The host machine switches to standby operation.

[0086] Figure 3 The figure shows the flow chart of the power control redundant device standby operation. It includes the following steps:

[0087] Step BJ1: the power control device is in standby operation;

[0088] Step BJ2: Determine whether the primary frequency modulation is activated. If the primary frequency modulation is not activated, return to step BJ1; otherwise, enter step BJ3.

[0089] Step BJ3: Determine the main and standby operation modes. In the manual designated mode, enter step BJ4; in the free competition mode, enter step BJ5;

[0090] Step BJ4: When it is manually designated as the master, switch to the master operation and jump to step BJ9; otherwise, it is manually designated as the standby machine and return to step BJ1;

[0091] Step BJ5: Free competition mode, determine whether the other machine is powered off, if the other machine is powered off, jump to step BJ9, otherwise go to step BJ6;

[0092] Step BJ6: Compare the versions of the control machine and the backup machine to see if they are consistent. If they are consistent, proceed to step BJ7. If they are inconsistent, return to step BJ1.

[0093] Step BJ7: Determine whether there is any abnormality in the machine. If no abnormality occurs, return to step BJ1; otherwise, go to step BJ8;

[0094] Step BJ8: Determine whether the machine is operating normally. If the machine is operating normally, switch to host operation and enter step BJ9. Otherwise, return to step BJ1.

[0095] Step BJ9: The standby machine switches to the main machine for operation.

[0096] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A power control redundancy device, used for power control master-slave redundancy control of a new energy station, including machine A and machine B, characterized in that: One of A and B is the master, and the other is the backup. A and B can switch between master and backup. Machine A and machine B have the same structure, both of which include: real-time library unit, data acquisition unit, data forwarding unit, data mapping unit, logic control unit and communication unit; The data acquisition unit is used to collect the information of the local machine and the counterpart machine through the communication unit, send it to the real-time library unit of the local machine, and pass it to the logic control unit; The data forwarding unit is used to forward the local information read from the real-time library unit to the opposite machine through the communication unit, and receive it through the data acquisition unit of the opposite machine; The logic control unit is used for active / standby switching, running the power control algorithm and generating control results; The data mapping unit is arranged between the real-time library unit and the logic control unit, and is used to transmit the local state to the logic control unit through the mapping unit, so that the logic control unit can monitor whether the local state is normal.

2. A power control redundancy device according to claim 1, characterized in that: The logic control unit of the host is used to monitor that when the host status is running normally, it will run the control logic normally and send the control instructions to the control device normally. At the same time, the host will forward the control instructions, function activation and deactivation commands, and host status to the standby machine through the communication unit; The logic control unit of the standby machine is used to determine that the machine is a standby machine based on its status after receiving the synchronization data from the host machine, synchronize the host machine's control instructions and function activation and deactivation instructions to the machine, and send the locking instructions to the control device.

3. A power control redundancy device according to claim 2, characterized in that: The logic control unit determines whether the master-slave switching conditions are met and whether the master-slave switching can be performed based on the key data verification code, the master-slave key process, and the master-slave key status information, and runs the power control algorithm and generates a control result.

4. A control method for a power control redundant device, used to control a power control redundant device as claimed in claim 1-3, characterized in that: The following steps are involved: Step 1: Initialize the status of machine A and machine B, and set either of them as the host; Step 2: The logic control units of the master and the backup machine determine the master and backup status, wherein the master transmits its status to the logic control unit through the mapping unit, and the logic control unit monitors the status of the master. If the master is operating normally, step 3 is executed; If the host is running abnormally, go to step 4; Step 3: The host normally sends the control command to the control device, and at the same time, the host forwards the control command, function launch and shutdown command, and host status to the standby machine through the communication unit; after the standby machine receives the synchronization data from the host, the logic control unit combines the state of the local machine, determines that the local machine is the standby machine, synchronizes the control command and function launch and shutdown command of the host to the local machine, and sends the locking command to the control device; Step 4: Determine whether the versions of the host and the standby are consistent and whether the standby is running normally; If the versions of the master and slave machines are consistent and the slave machine is running normally, the master and slave machines will switch operation.

5. The control method of a power control redundancy device according to claim 4, characterized in that: The power control redundancy device prohibits the switching of the main and standby machines when detecting a frequency modulation action signal.

6. The control method of a power control redundancy device according to claim 4, characterized in that: In step 1, the master-slave switching mode is set by the soft pressure plate to switch whether the master and standby machines are manually designated or compete freely.

7. The control method of a power control redundancy device according to claim 4, characterized in that: In step 2, the logic control unit has five levels when judging the active and standby status: The first level is primary frequency modulation, during which no primary and standby calculations are performed; The second level is to use the soft pressure plate to determine whether the current master and standby are manually designated or free competition; The third level is whether the host is powered off in the free competition mode. If the host is powered off, the standby machine will be promoted to the master immediately; The fourth level is to determine whether the versions of the peer machine and the local machine are consistent in the free competition mode. If they are not consistent, the master-slave calculation is not performed. The fifth level is the free competition mode, in which the status of the local machine and the opposite machine are evaluated to determine the primary and standby status of the local machine.

8. The control method of a power control redundancy device according to claim 4, characterized in that: In step 2, the host operation abnormality includes: host key task abnormality, device board abnormality or primary and standby forwarding unit abnormality.

9. The control method of a power control redundancy device according to claim 4, characterized in that: In step 4, the consistency of the key task verification code, as well as the consistency of the program, firmware, and configuration is used to determine whether the versions of the master and backup machines are consistent.

10. The control method of a power control redundancy device according to claim 4, characterized in that: In the free competition mode, when the host process is abnormal, the data forwarding unit of the host sends the host abnormal status to the standby machine. After the standby machine receives the host abnormal status and the local status is normal, the standby machine logic control unit upgrades the standby machine to the master; after the host receives the standby machine host status through the master-standby data acquisition unit, the local host status is downgraded to the standby machine.

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