A power control device for an energy storage station based on double-redundant hot standby and an intelligent seamless switching method thereof

Abstract

The application discloses a kind of energy storage station power control device based on double redundancy hot standby and its intelligent seamless switching method, it is related to energy storage station power control field, the device includes: redundancy hot standby double machine, the redundancy hot standby double machine includes main machine and standby machine;The main machine is used to control the power of energy storage station, when the main machine normal operation, the standby machine is normal operation simultaneously, but does not participate in power control;When the main machine appears exception or failure, switch the standby machine controls the power of energy storage station.This application can guarantee the reliability of whole station power control system, also guarantees the continuity of system whole process power control function, there is no whole station power control function long time loss situation.

Description

Technical Field

[0001] This application relates to the field of power control for energy storage stations, and in particular to a power control device for energy storage stations based on dual redundancy hot standby and its intelligent seamless switching method. Background Technology

[0002] Currently, there are two main methods for controlling the frequency, active power, and voltage, and reactive power of large-scale energy storage systems on the grid / power source side: one is to implement unified regulation of energy storage stations through an Energy Management System (EMS). This method is suitable for secondary frequency regulation and steady-state regulation of the grid, and its response time for both active and reactive power regulation is in the order of seconds or more. The other method is to collect and calculate the grid frequency and voltage through a Power Conversion System (PCS) and adjust the active and reactive power output in real time according to the changes in frequency and voltage. This method is suitable for primary frequency regulation and dynamic reactive power and voltage regulation, and its response time is in the order of hundreds of milliseconds or more.

[0003] While the former method can achieve unified regulation of active and reactive power, its response cycle is long and it cannot complete primary frequency regulation and dynamic reactive power and voltage regulation control. While the latter method can complete primary frequency regulation and dynamic voltage control and has improved response time performance, the measurement accuracy will decrease because each PCS works independently, especially during dynamic regulation, when the frequency and voltage are also in a dynamic state. The effects of sampling and calculation will lead to significant differences in the operating characteristics of each energy storage converter in the entire station. Moreover, as the scale of the energy storage station expands and the number of PCS increases, the differences become more obvious, resulting in unsatisfactory primary frequency regulation and dynamic voltage regulation performance of the entire station.

[0004] To fully leverage the active and reactive power dynamic regulation capabilities of large-scale energy storage systems on the grid / power source side, and to improve the consistency and speed of primary frequency regulation and dynamic voltage regulation response, power control systems for large-scale energy storage power stations have emerged. These power control systems modularize the active and reactive power regulation functions of the entire station and deploy power control devices at the energy storage station's bay level to achieve rapid and unified control of the station's active and reactive power. Currently, some energy storage stations adopt a single-set configuration mode for power control devices, working in conjunction with the EMS system to complete the station's power control, enabling transient power regulation functions with high real-time requirements, such as primary frequency regulation and dynamic voltage regulation. However, this has led to new problems: when the energy storage power control device malfunctions or fails, or when the GOOSE control network communication link is abnormal or interrupted, the station's power control function becomes abnormal, or power control capability is completely lost. Summary of the Invention

[0005] The purpose of this application is to provide a power control device for an energy storage station based on dual redundancy hot standby and its intelligent seamless switching method, which can ensure both the reliability of the system and the continuity of the power control function throughout the entire process, and will not result in the loss of the power control function of the entire station for a long time.

[0006] To achieve the above objectives, this application provides the following solution:

[0007] In a first aspect, this application provides a power control device for an energy storage station based on dual redundancy hot standby, comprising: a dual redundant hot standby unit, wherein the dual redundant hot standby unit includes a primary unit and a standby unit; the primary unit is used to control the power of the energy storage station; when the primary unit is operating normally, the standby unit is also operating normally but does not participate in power control; when the primary unit malfunctions or fails, the standby unit is switched to control the power of the energy storage station.

[0008] Secondly, this application provides an intelligent seamless switching method for a power control device of an energy storage station based on dual redundancy hot standby. The method is applied to the aforementioned power control device for an energy storage station based on dual redundancy hot standby, and includes:

[0009] During power-on initialization, the local device's operating state is switched to standby mode, and the local device's operating state signal Sta01 is set to 2.

[0010] Determine whether the local device is under maintenance or in a fault state.

[0011] If so, set the local device operating status signal Sta01 to 3 or 4;

[0012] If not, proceed to the first switching process;

[0013] The first switching process is as follows: If the switch enable setting word SwitchAllow for the local device's working state is 1, and the power-down flag word Opp_DevPwrLoss for the peer device is low, then the local device's prohibition switching flag word is set to 0, and the second switching process is entered; if the switch enable setting word SwitchAllow for the local device's working state is 0, or the power-down flag word Opp_DevPwrLoss for the peer device is high, then the local device's prohibition switching flag word ProhibitSwich is set to 1, and after a T4 delay, the local device's working state signal Sta01 is set to 1, and the local device's working state is switched to the master device state.

[0014] According to the specific embodiments provided in this application, this application has the following technical effects:

[0015] This application provides a power control device for an energy storage station based on dual redundancy hot standby and its intelligent seamless switching method. During normal operation of the energy storage station, both redundant hot standby units operate normally, with the primary unit responsible for overall station power control, while the standby unit operates simultaneously but does not participate in power control. When the primary unit malfunctions or fails, the standby unit can autonomously and seamlessly switch to become the primary unit, ensuring both the reliability of the overall station power control system and the continuity of power control functions throughout the entire process, preventing prolonged loss of overall station power control functionality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the control network topology for a power control device based on a dual-redundant hot standby energy storage station.

[0018] Figure 2 A flowchart illustrating the intelligent seamless switching method for the power control device of an energy storage station based on dual redundancy hot standby.

[0019] Figure 3 for Figure 2 A flowchart of the switching process 1 (i.e., the first switching process) in the process;

[0020] Figure 4 for Figure 3 A flowchart illustrating switching process 2 (i.e., the second switching process);

[0021] Figure 5 for Figure 4 A flowchart of switching process 3 (i.e., the third switching process) in the process.

[0022] Figure 6 for Figure 5 The flowchart of switching process 4 (i.e. the fourth switching process) in the process. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] In an exemplary embodiment, a power control device for an energy storage station based on dual redundancy hot standby (hereinafter referred to as the energy storage station power control device) is provided, comprising: a dual redundant hot standby unit, wherein the dual redundant hot standby unit includes a primary unit and a standby unit; the primary unit is used to control the power of the energy storage station; when the primary unit is operating normally, the standby unit is also operating normally but does not participate in power control; when the primary unit malfunctions or fails, the standby unit is switched to control the power of the energy storage station.

[0026] Figure 1 As shown, the energy storage station power control device provided in this application consists of a power supply module (PWR), a control module (CTL), a communication module (COM), a communication expansion module (EXP), an input module (DI), and an output module (DO). The core of the power control network is the power control device, where power control device 1 and power control device 2 serve as hot backups for each other. The power control device and the station control layer EMS are networked using IEC61850-MMS, and the power control device receives remote control primary / standby switching commands sent from the EMS. The power control device and the PCS are networked using IEC61850-GOOSE fiber optic A and B dual networks.

[0027] In this application, the primary device is the local device and the backup device is the remote device; or the backup device is the local device and the primary device is the remote device.

[0028] The logic resources of the power control device in the energy storage station are described below.

[0029] (1) Acquisition of hard-contact input signals of this device.

[0030] The local device needs to collect hard-contact input signals via shielded cables or wires. These hard-contact input signals include: DI01 (remote device fault input signal), DI02 (set local device as master input signal), DI03 (set local device as standby input signal), and DI04 (local device maintenance status input signal). The hard-contact input signals are shown in Table 1.

[0031] Table 1

[0032]

[0033] (2) Local device GOOSE (GOOSE---Generic Object Oriented Substation Event) signal release.

[0034] The GOOSE signals that this device needs to publish through the fiber optic network port include: local device working status signal Sta01, local device local master / standby switchover command Sta02, and local device serial number DevNum, as shown in Table 2.

[0035] Table 2

[0036]

[0037] Table 2 shows four operating states of the local device, which are determined in real time by the local device based on the current operating mode:

[0038] The primary machine status is set, Sta01 is assigned a value of 1;

[0039] Standby machine status, Sta01 is assigned a value of 2;

[0040] Fault status, Sta01 is assigned a value of 3;

[0041] In maintenance status, Sta01 is assigned a value of 4.

[0042] In Table 2, the local primary / standby switching command Sta02 of this device is generated based on the status of the hard contact input signals DI02 and DI03 obtained from Table 1. The generation logic is as follows:

[0043] When DI02 and DI03 are in the same state, Sta02 is set to 1 to indicate an empty state.

[0044] When DI02 is high and DI03 is low, Sta02 is set to 2, and the local device switches to master mode.

[0045] When DI02 is at a low level and DI03 is at a high level, Sta02 is set to 3, and the local device switches to standby mode.

[0046] The device serial number DevNum is manually set in the device itself, and its value is not equal to the device serial number DevNum of the peer device.

[0047] (3) Subscription of local device GOOSE signal and data.

[0048] The GOOSE signals that this device needs to subscribe to through the fiber optic network port include: the peer device's working status signal Opp_Sta01, the peer device's local primary / standby switchover command Opp_Sta02, and the peer device's serial number Opp_DevNum, as shown in Table 3.

[0049] Table 3

[0050]

[0051] The working status of the peer device is determined in real time by the peer device based on its current operating mode, and the logic and assignment method for determining the working status of the local device are the same.

[0052] The peer device master / standby switchover command Opp_Sta02 is generated by the peer device based on the hard contact input status, and its judgment logic and assignment method are the same as those of the local device's local master / standby switchover command Sta02.

[0053] The remote device serial number Opp_DevNum is manually set in the remote device, and its value is not equal to the local device serial number DevNum.

[0054] (4) Other resources.

[0055] Other resources required for this application are as follows:

[0056] The enable setting for switching the operating state of the local device is SwitchAllow. When SwitchAllow is set to 1, it indicates that the local device is allowed to switch between primary and standby states; when it is set to 0, it indicates that the local device is not allowed to switch between primary and standby states.

[0057] The remote control master / standby switchover command received by this device from the energy management system is Sta03. Sta03 is 1 indicating no command, 2 indicating a remote switch to master mode, and 3 indicating a remote switch to standby mode. Pre_Sta03 indicates the status of the remote control master / standby switchover command after the previous logical judgment.

[0058] The "ProhibitSwich" flag for this device prohibits switching. When ProhibitSwich is 1, switching between the local and remote devices is prohibited, and the local device is set to the master device status. When ProhibitSwich is 0, the local and remote devices can switch their operating statuses according to the current conditions.

[0059] The following explains the discrimination logic of the power control device of the energy storage station. The local device and the remote device are identical, using the same hardware and software.

[0060] (1) Anomaly detection of the optical fiber GOOSE control network of the device.

[0061] When an abnormality is detected in the fiber optic communication link between the local device and the remote device, the link abnormality flag DualDevCom_Err is set to a high level; when an abnormality is detected in the fiber optic communication link with all PCS, the PCS fiber optic communication link abnormality flag PCS_DevCom_Err is set to a high level.

[0062] (2) Device fault diagnosis.

[0063] The device monitors its own CPU plug-in hardware and processes in real time for anomalies, including errors in analog channel AD sampling and CPU interaction, abnormal sampling data, and internal communication bus malfunctions. Any such anomaly is identified as a device fault, and the device fault output signal DevErr is set high, with the signal output to the peer device. For example, when the peer device's fault output signal DevErr is high, the DI02 received by this device will be high, and vice versa.

[0064] (3) Power failure detection of the device at the other end.

[0065] When the local device detects that the DI02 signal is high and the link abnormality flag DualDevCom_Err is also set to high, it determines that the remote device has lost power and sets Opp_DevPwrLoss to high.

[0066] like Figure 2 As shown, in an exemplary embodiment, a smart seamless switching method for a power control device of an energy storage station based on dual redundancy hot standby is provided. The method is applied to the aforementioned power control device for an energy storage station based on dual redundancy hot standby, and includes:

[0067] Determine whether the local device is under maintenance. Input signal DI04 is at a high level.

[0068] If so, the working state of this device will be switched to maintenance state, and Sta01 will be set to 4.

[0069] If not, determine whether the fault signal DevErr of this device is high, or whether the abnormal flag PCS_DevCom_Err of the fiber optic communication link between this device and all PCS is high.

[0070] If so, the working state of this device will be switched to fault state, and Sta01 will be set to 3.

[0071] If not, then determine whether the local device is in a maintenance state or a fault state.

[0072] If so, set the local device operating status signal Sta01 to 3 or 4.

[0073] If not, proceed to the first switching process (i.e., switching process 1).

[0074] like Figure 2As shown, when the local device detects that DI04 is set to a high level, it switches the local device's operating state to maintenance state, and Sta01 is set to 4; when the local device monitors that the local device fault signal DevErr is high, or the fiber optic communication link between the local device and all PCS is abnormal, i.e., the PCS_DevCom_Err signal is high, it switches the local device's operating state to fault state, and Sta01 is set to 3.

[0075] Special attention should be paid to the following: After DI04 and DevErr return to low level, the working state of the local device should be switched to standby mode first, and Sta01 should be set to 2. Considering that the GOOSE heartbeat message interval is usually set to time T1, in order to prevent the local device and the remote device from simultaneously determining the master device state during the heartbeat message interval, the fault signal DevErr return needs to be set to a delayed return, and the delay time T2 should be greater than T1.

[0076] During the power-on initialization of the local device, its operating status must be set to standby mode, i.e., Sta01 is set to 2. After the software enters the main logic, it first determines whether the local device is in maintenance or fault mode. If so, Sta01 is set to 3 or 4. It should be noted that if the local device returns to maintenance or fault mode, its status must first be set to standby mode, i.e., Sta01 is set to 2. If the device is operating normally, i.e., not in maintenance or fault mode, the first handover procedure is initiated.

[0077] like Figure 3 As shown, the first switching process is as follows: If the switch enable setting word SwitchAllow for the local device's working state is 1, and the power-down flag word Opp_DevPwrLoss for the peer device is low (the peer device is not powered down), then the local device's prohibition switching flag word is set to 0, and the second switching process (i.e., switching process 2) is entered; if the switch enable setting word SwitchAllow for the local device's working state is 0 (the state switching function is not enabled), or the power-down flag word Opp_DevPwrLoss for the peer device is high, then the local device's prohibition switching flag word ProhibitSwich is set to 1, prohibiting the local device from performing state switching, and after a delay of T4, the local device's working state signal Sta01 is set to 1, the local device's working state is switched to the master device state, and the subsequent switching logic judgment is exited.

[0078] Figure 4 As shown, the second switching process is as follows:

[0079] Determine the status of the local primary / standby switch command Sta02. If Sta02 is 3, set the local device operating status signal Sta01 to 2, and switch the local device operating status to standby mode. If Sta02 is 2, after a T1 delay, set the local device operating status signal Sta01 to 1, and switch the local device operating status to primary mode, then end the determination logic.

[0080] If Sta02 is set to 1, the working status signal Opp_Sta01 of the peer device is checked. If Opp_Sta01 is 3 or 4, it indicates that the peer device is in a fault or maintenance state. In this case, the working status signal Sta01 of the local device is set to 1, and the working status of the local device is switched to the master device state, ending the judgment logic. If Opp_Sta02 is 2, the working status signal Sta01 of the local device is set to 2, and the working status of the local device is switched to the standby device state, ending the judgment logic. If Opp_Sta02 is set to 1, the third switching procedure (i.e., switching procedure 3) is entered.

[0081] like Figure 5 As shown, the third switching process is as follows:

[0082] The system checks whether the remote control master / standby switchover command Sta03 received by the local device from the energy management system has been updated (i.e., whether the current Sta03 is the same as the previous Pre_Sta03). If there is no update and the previous state was empty, the system proceeds to the fourth switchover process (i.e., switchover process 4). If there is an update and Sta03 is 2, indicating the peer device is not in master / standby mode, the local device's operating status signal Sta01 is set to 1, and the local device switches to master / standby mode, ending the decision logic. If Sta03 is 2 and the peer device is in master / standby mode, after a T2 delay, the local device's operating status signal Sta01 is set to 1, and the local device switches to master / standby mode, ending the decision logic. If Sta03 is 3, the local device's operating status signal Sta01 is set to 2, and the local device switches to standby mode, ending the decision logic.

[0083] like Figure 6 As shown, the fourth switching process is as follows:

[0084] Determine if the operating status of the local device is the same as that of the remote device. If they are different, maintain the status quo and do not perform any processing, thus ending the determination logic. If they are the same, after a T3 delay, set the primary and backup devices according to the serial numbers of the local and remote devices. Set the device with the smaller serial number in the local device set as the primary device, and the device with the larger serial number in the remote device set as the primary device, then end the determination logic.

[0085] In this application, the power control device of the energy storage station adopts a hot standby dual-redundancy configuration. During normal operation of the energy storage station, both the primary and standby units operate normally, with the primary unit responsible for completing the overall power control of the station. The standby unit operates normally simultaneously but does not participate in power control. When the primary unit malfunctions or fails, the standby unit can autonomously and seamlessly switch to operate as the primary unit. Simultaneously, reasonable settings are implemented for local and remote primary / standby unit status switching required for maintenance and operation mode switching. This ensures both the reliability of the overall power control system and the continuity of power control functions throughout the entire process, preventing prolonged loss of overall power control functionality.

[0086] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0087] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0088] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0089] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A power control device for an energy storage station based on dual redundancy hot standby, characterized in that, include: Redundant hot standby dual-machine system, wherein the redundant hot standby dual-machine system includes a primary machine and a standby machine; The primary unit is used to control the power of the energy storage station. When the primary unit is operating normally, the backup unit is also operating normally but does not participate in power control. When the primary unit malfunctions or fails, the backup unit is switched to control the power of the energy storage station. The primary unit, backup unit, and PCS are networked using IEC61850-GOOSE fiber optic A and B dual-network architecture; the primary unit is the local device, and the backup unit is the peer device; or the backup unit is the local device, and the primary unit is the peer device; the hard-contact input signals of the local device include: peer device fault input signal DI01, setting the local device to primary unit input signal DI02, setting the local device to backup unit input signal DI03, and local device maintenance status input signal DI04. The GOOSE signals published by the local device through the fiber optic network port include: local device working status signal Sta01, local device local master / standby switchover command Sta02, and local device serial number DevNum. Sta01 is 1 when the local device is in the primary operating state; Sta01 is 2 when the local device is in the standby operating state; Sta01 is 3 when the local device is in the fault state; Sta01 is 4 when the local device is in the maintenance state. The enable setting for switching the working state of the local device is SwitchAllow. When SwitchAllow is 1, it means that the local device is allowed to switch between primary and standby machine states. When SwitchAllow is 0, it means that the local device is not allowed to switch between primary and standby machine states. The remote control master / standby switch command received by this device from the energy management system is Sta03. When Sta03 is 1, it means there is no command. When Sta03 is 2, it means the remote control switches the working state of this device to master / standby mode. When Sta03 is 3, it means the remote control switches the working state of this device to standby mode. The status of the remote control master / slave switch command after the last logical judgment of the local device is represented as Pre_Sta03; The "ProhibitSwich" flag for this device prohibits switching. When ProhibitSwich is 1, it means that the local device and the remote device are prohibited from switching their working states. When ProhibitSwich is 0, the working states of the local device and the remote device are switched according to the current conditions. A power control device for an energy storage station based on dual redundancy hot standby is used to execute an intelligent seamless switching method for a power control device for an energy storage station based on dual redundancy hot standby, the method comprising: During power-on initialization, the local device's operating state is switched to standby mode, and the local device's operating state signal Sta01 is set to 2. Determine whether the local device is under maintenance or in a fault state; if so, set the local device operating status signal Sta01 to 3 or 4; if not, proceed to the first switching process. The first switching process is as follows: If the switch enable setting word SwitchAllow for the local device's working state is 1, and the power-down flag word Opp_DevPwrLoss for the remote device is low, then the local device's prohibition switching flag word is set to 0, and the second switching process is entered; if the switch enable setting word SwitchAllow for the local device's working state is 0, or the power-down flag word Opp_DevPwrLoss for the remote device is high, then the local device's prohibition switching flag word ProhibitSwich is set to 1, and after a T4 delay, the local device's working state signal Sta01 is set to 1, and the local device's working state is switched to the master device state. The second switching process is as follows: Determine the status of the local primary / standby switchover command Sta02. If Sta02 is 3, set the local device's operating status signal Sta01 to 2, and switch the local device's operating status to standby mode. If Sta02 is 2, after a T1 delay, set the local device's operating status signal Sta01 to 1, and switch the local device's operating status to primary mode. If Sta02 is 1, check the remote device's operating status signal Opp_Sta01. If Opp_Sta01 is 3 or 4, it indicates that the remote device is in a fault or maintenance state. In this case, set the local device's operating status signal Sta01 to 1, and switch the local device's operating status to primary mode. If Opp_Sta02 is 2, set the local device's operating status signal Sta01 to 2, and switch the local device's operating status to standby mode. If Opp_Sta02 is 1, proceed to the third switching process. The third switching process is as follows: Determine if the remote control master / standby switch command Sta03 received by the local device from the energy management system has been updated. If there is no update and the previous state was empty, proceed to the fourth switching process. If there is an update and Sta03 is 2, indicating the peer device is not in master / standby mode, set the local device's operating status signal Sta01 to 1, and switch the local device's operating status to master / standby mode. If Sta03 is 2 and the peer device is in master / standby mode, after a T2 delay, set the local device's operating status signal Sta01 to 1, and switch the local device's operating status to master / standby mode. If Sta03 is 3, set the local device's operating status signal Sta01 to 2, and switch the local device's operating status to standby mode. The fourth switching process is as follows: determine whether the working status of the local device is the same as that of the remote device; if they are different, maintain the status quo and do not perform any processing; if they are the same, after a T3 delay, set the primary and backup devices according to the serial numbers of the local and remote devices.

2. The power control device for an energy storage station based on dual redundancy hot standby as described in claim 1, characterized in that, When DI02 and DI03 are in the same state, Sta02 is set to 1 to indicate an empty state. When DI02 is high and DI03 is low, Sta02 is set to 2, and the local device switches to master mode. When DI02 is at a low level and DI03 is at a high level, Sta02 is set to 3, and the local device switches to standby mode.

3. The power control device for an energy storage station based on dual redundancy hot standby as described in claim 1, characterized in that, The GOOSE signals subscribed by the local device to the peer device through the fiber optic network port include: peer device working status signal Opp_Sta01, peer device local master / slave switchover command Opp_Sta02, and peer device serial number Opp_DevNum.

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