A dual configuration method of an automatic voltage control system of a power plant

Abstract

This invention discloses a dual configuration method for an automatic voltage control system in a power plant, applied to a new energy power plant. The new energy power plant includes two sets of automatic voltage control systems, each of which is communicatively connected to the AVC dispatch master station and reactive power equipment. These systems collect real-time data from the reactive power equipment and issue reactive power commands. A dual-channel Goose communication is established between the two sets of automatic voltage control systems, allowing them to transmit their real-time status data to each other via this dual-channel communication. The advantages of this invention are: the use of dual-channel Goose communication between the two sets of automatic voltage control systems ensures the accuracy, reliability, and integrity of data transmission between the master and backup systems.

Description

Technical Field

[0001] This invention relates to the field of new energy, and more specifically to a dual configuration method for an automatic voltage control system in a power plant. Background Technology

[0002] Automatic Voltage Control (AVC) systems can automatically control the voltage of renewable energy power plants by adjusting the reactive power equipment. AVC ensures the safe, high-quality, and economical operation of renewable energy grid connections, achieving optimized allocation of electrical resources and comprehensive utilization of renewable energy generation. The reliability and stability of AVC operation are extremely important. The crucial role of AVC in renewable energy power plant operation requires its safe and reliable operation, enabling rapid, reliable, and uninterrupted exchange of real-time status and command data between primary and backup units, and achieving seamless switching between them.

[0003] However, currently, most AVC (Automatic Voltage Regulator) systems in new energy power plants operate as single units or in a cold standby mode. If the main unit fails, and the standby unit cannot switch to the main unit in time, the voltage of the new energy power plant will become uncontrollable or even unstable during the switching process, thus affecting the voltage and safety of the power grid. For example, Chinese Patent Publication No. CN107026461A discloses a fast power coordination control method for new energy power plants participating in primary frequency regulation. A fast power coordination control system is established in the new energy power plant. This system receives fast power adjustment commands from the main stabilization control system and AVC / AVC planned adjustment commands from the dispatch center. It can also calculate the target power offline and locally, and then decompose the target power and send it directly to the numerous photovoltaic inverters, wind turbines, and other power generation units in the plant via Ethernet network. However, it operates as a single unit. If this single unit fails, the voltage of the new energy power plant will become uncontrollable or even unstable, thus affecting the voltage and safety of the power grid.

[0004] Chinese Patent Publication No. CN110784007A discloses a redundancy method for a microgrid coordinated control device. The microgrid control system is configured with two microgrid coordinated control devices with identical programs. The devices' operating states are divided into initialization state, main unit operating state, standby unit operating state, main / standby unit switching state, and lockout state. During normal operation, one device is in the main unit operating state, and the other is in the standby unit operating state. The main unit transmits device operating logic variables to the standby unit in real time to achieve data synchronization. The two devices mutually transmit and verify real-time operating status information to realize the main / standby unit switching logic. Existing automatic voltage control systems in power plants often employ similar control devices and strategies to those described in the aforementioned patent application for both the main and standby units.

[0005] However, because it uses a single-channel Goose communication between the primary and backup machines, it does not verify the data in the Goose messages and does not consider the adverse effects of network packet loss on the data synchronization between the primary and backup machines. Unpredictable factors such as power failure of the switch and loose network cable interfaces can easily cause communication interruptions between the primary and backup machines, making it difficult to guarantee the accuracy, reliability, and integrity of data transmission between the primary and backup machines. Summary of the Invention

[0006] The technical problem to be solved by this invention is that in the existing technology of two sets of automatic voltage control systems for power plants, the main unit and the standby unit often use single-channel Goose communication, which makes it difficult to guarantee the accuracy, reliability and integrity of data transmission between the main and standby units.

[0007] This invention solves the above-mentioned technical problems through the following technical means: a dual configuration method for an automatic voltage control system in a power plant, applied to a new energy power plant, wherein the new energy power plant includes two sets of automatic voltage control systems, which are respectively connected to the AVC dispatch master station and reactive power equipment, collect real-time data of the reactive power equipment of the new energy power plant and issue reactive power commands, and establish dual-channel Goose communication between the two sets of automatic voltage control systems.

[0008] The two automatic voltage control systems exchange real-time status data, real-time command data, and corresponding valid bits, and use the valid bits to determine whether to update the command data.

[0009] The two automatic voltage control systems use a change transmission confirmation mechanism for communication. After one system generates change information, it sends change messages at a high frequency. After receiving a confirmation message from the other system, it reduces the sending frequency.

[0010] The two systems are connected to the dual network through different network ports and their respective independent switches. The two networks work simultaneously. When one system sends a goose message to the other system, it sends the same message to both networks. The other system receives the messages from both networks at the same time and determines whether to update the data.

[0011] Beneficial effects: This invention employs dual-channel Goose communication between the two automatic voltage control systems, achieving redundant dual-network communication. This enables rapid, reliable, and uninterrupted exchange of real-time status data and real-time command data between the primary and backup systems, achieving seamless switching between them. The simultaneous operation and transmission of Goose communication across both networks ensures the speed and integrity of data transmission. By using valid bits to determine whether command data needs updating, data transmission errors between the two systems are avoided, improving the accuracy of transmitted data. A variable-bit transmission confirmation mechanism ensures that a message is sent only after receiving confirmation from the other system, preventing data loss or omission and guaranteeing the reliability of Goose message transmission.

[0012] Furthermore, the operating states of the automatic voltage control system include startup state, main unit state, standby state, and abnormal state. After power-on, the automatic voltage control system first enters the startup state. After time T0, the startup state ends. In the startup state, the two automatic voltage control systems establish dual-channel Goose communication. After the communication is established, the two systems transmit their real-time status data to each other.

[0013] Furthermore, the real-time status data includes change message confirmation markers, weight information, heartbeat counts, and abnormal signals.

[0014] Furthermore, the reactive power equipment includes an inverter, a wind turbine energy management system, and an SVG. In the startup state, both systems communicate with the AVC dispatch master station simultaneously, with the same communication point table. The two systems also communicate with the inverter, the wind turbine energy management system, and the SVG respectively, to collect real-time data of the reactive power equipment of the new energy power station and issue reactive power commands. The two systems transmit real-time command data to each other.

[0015] Furthermore, the real-time instruction data includes: change message confirmation flag, AVC voltage target value, AVC voltage reference value, AVC reactive power target value, AVC reactive power reference value, AVC reactive power upper limit value, AVC reactive power lower limit value, AVC voltage increment instruction, AVC reactive power increment instruction, and the corresponding valid bits of each instruction.

[0016] Furthermore, when the host or standby system in both systems receives the instruction issued by the AVC scheduling master station, the corresponding instruction validity bit in the real-time instruction data is set to 1, the instruction is updated to the latest instruction issued by the master station, and the real-time instruction data is immediately packaged into a message and sent to the other system. When the other system parses the message, it updates the instruction when the instruction validity bit is 1, otherwise it does not update.

[0017] Furthermore, the master or standby switchover process in the two systems is as follows:

[0018] A1) Determine if the local system is in the startup state. If yes, switch the local system to standby state; otherwise, proceed to step A2.

[0019] A2) Determine if the local system is abnormal. If so, switch the local system to abnormal state; otherwise, proceed to step A3. Among them, system failure or communication interruption with the main station or reactive power equipment is considered as system abnormality.

[0020] A3) Determine whether the Goose dual-network communication of the other system is disconnected. If so, switch the local system to host mode; otherwise, proceed to step A4.

[0021] A4) Determine if the system on the other side is abnormal. If so, switch the system on this side to host mode; otherwise, proceed to step A5.

[0022] A5) Determine if the heartbeat refresh of the other system is abnormal. If it is, switch the local system to host mode; otherwise, proceed to step A6.

[0023] A6) Determine whether the weight of the primary and backup systems on this side is greater than the weight of the system on the other side. If yes, the system on this side switches to the primary state; if not, the system on this side switches to the backup state.

[0024] Furthermore, when both the main and standby units in the two automatic voltage control systems use the Goose communication method to communicate with the reactive power equipment, both the main and standby units subscribe to the Goose messages sent by the reactive power equipment and collect the equipment's power-on status and reactive power data from the messages. The reactive power equipment only subscribes to the Goose messages sent by the main unit, receives and executes the reactive power remote adjustment commands sent by the main unit, and the standby unit blocks the sending of Goose messages. When the original main unit is switched to the standby unit, the sending of Goose messages is also blocked. The original standby unit, as the new main unit, begins reactive power regulation and enables the Goose message sending function.

[0025] Furthermore, the change transmission acknowledgment mechanism includes: when one system sends a change message, the status sequence number in the message is incremented by 1, and the goose message is retransmitted at a first preset time interval. Upon detecting the status number increment, the receiving system immediately replies with an acknowledgment message. If the receiving system fails to receive the acknowledgment message from the receiving system, it continues to retransmit the goose message at a second preset time interval until it receives the acknowledgment message from the receiving system. After receiving the acknowledgment message, a heartbeat message is sent at a third preset time interval. The first preset time interval is no longer than the second preset time interval, and the second preset time interval is shorter than the third preset time interval.

[0026] Furthermore, the counterpart system simultaneously receives messages from both networks and determines whether to update data, including:

[0027] B1) Determine if the parameters of the currently received message are correct. If yes, proceed to step B2; otherwise, discard the message.

[0028] B2) Determine whether the status sequence number of the currently received message is greater than the status sequence number of the previous frame message. If so, update the data according to the message; otherwise, proceed to step B3.

[0029] B3) Determine whether the current received message status sequence number is equal to the previous frame message status sequence number. If yes, proceed to step B4; otherwise, determine whether the sender has restarted the system. If yes, update the data; otherwise, discard the message.

[0030] B4) Determine whether the sequence number of the currently received message is greater than or equal to the sequence number of the previous frame message. If it is, consider the message to be a duplicate transmission message and discard the message. If not, determine whether the sender has restarted the system. If yes, update the data; otherwise, discard the message.

[0031] The advantages of this invention are:

[0032] (1) The present invention adopts dual-channel Goose communication between the two automatic voltage control systems to realize dual-network redundant communication, realize fast, reliable and uninterrupted interaction of real-time status data and real-time command data between the master and the standby, realize seamless switching between the master and the standby. The simultaneous operation and transmission of the two networks of Goose communication ensures the speed and integrity of data transmission. The use of valid bits to determine whether to update command data avoids the occurrence of data mistransmission between the two systems and improves the accuracy of transmitted data. The use of a variable bit transmission confirmation mechanism ensures that the message is sent only after receiving the confirmation message from the other system, avoids data omission or loss, and ensures the reliability of Goose message transmission.

[0033] (2) The present invention sets up a real-time instruction update mechanism for the main and backup machines. After the main machine or the backup machine receives the instruction issued by the AVC scheduling master station, the valid position of the instruction in the real-time instruction data is set to 1, the instruction is updated to the latest instruction issued by the master station, and the real-time instruction data is immediately forwarded to the other device, which effectively avoids the occurrence of data mistransmission between the two systems and further improves the accuracy of the transmitted data.

[0034] (3) This invention provides a complete master-slave switching strategy to avoid the failure of the master unit to switch the backup unit to the master unit in time when the master unit fails, thereby avoiding the voltage of the new energy power station being out of control or even losing stability during the switching process, and ensuring the safety of the power grid.

[0035] (4) The two automatic voltage control systems of the present invention use a variable transmission confirmation mechanism for communication to ensure that the heartbeat message is sent only after receiving the confirmation message from the other system, so as to avoid data omission or loss, and ensure that the data between the two automatic voltage control systems is quickly and completely synchronized, thereby avoiding system failures caused by data loss, and further ensuring the reliability of goose message transmission.

[0036] (5) The two automatic voltage control systems of this invention communicate using a dual-network redundancy method and update data in real time during communication. This avoids communication interruptions between the two automatic voltage control systems due to unpredictable factors such as power failure of the switch or loose network cable interfaces. The two automatic voltage control systems operate and transmit simultaneously using the dual networks of Goose communication, ensuring the speed and integrity of data transmission. This avoids data transmission interruptions due to single network failures and also avoids the delays of traditional Goose dual-network switching where one channel is disconnected and another channel is switched, thus ensuring uninterrupted communication. Simultaneously, the receiver determines whether communication is interrupted and decides whether to update data. When a duplicate transmission message or an error message transmitted due to a network failure is received, the data will not be updated, thereby ensuring data reliability. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of communication between new energy power plant equipment in a dual configuration method for an automatic voltage control system of a power plant provided in an embodiment of the present invention;

[0038] Figure 2 This is a flowchart illustrating the main / standby switchover process of a dual configuration method for an automatic voltage control system in a power plant, provided in an embodiment of the present invention.

[0039] Figure 3 This is a flowchart illustrating the judgment process for updating goose dual-network redundancy configuration data in a dual configuration method for an automatic voltage control system in a power plant, as provided in an embodiment of the present invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] like Figure 1As shown, a dual configuration method for an automatic voltage control system in a power plant is applied to a new energy power plant. The new energy power plant includes two automatic voltage control systems, an AVC (Automatic Voltage Control) master station, remote control units (RTUs), workstations, inverters, wind turbines, wind turbine energy management systems, and SVG (Static Var Generator) devices. Both automatic voltage control systems are communicatively connected to the AVC master station and the reactive power equipment, respectively, collecting real-time data from the reactive power equipment and issuing reactive power commands. A dual-channel Goose communication is established between the two automatic voltage control systems, allowing them to transmit their real-time status data to each other. Each automatic voltage control system receives commands from the AVC master station via the RTU and obtains manual setting commands via the workstation. Based on the deviation between the target command and the real-time value, each automatic voltage control system predicts the total reactive power that the controlled equipment should generate and distributes the reactive power to each inverter, wind turbine, or SVG, thereby achieving reactive power control for the entire power plant and maintaining the bus voltage at the target value.

[0042] The automatic voltage control system operates in four states: startup, main unit, standby, and abnormal. Upon power-up, the system first enters the startup state, which ends after time T0. During startup, the two systems establish Goose communication. After communication is established, the two systems transmit real-time status data to each other. The real-time status data transmitted between the two systems includes: change message acknowledgment markers, weight information, heartbeat counts, and abnormal signals.

[0043] In the startup state, both systems communicate simultaneously with the AVC dispatch master station, using the same communication point table. Both systems also need to communicate with the inverter, wind turbine energy management system, and SVG to collect real-time data from the reactive power equipment of the new energy power plant and issue reactive power commands.

[0044] The real-time command data transmitted between the two systems includes: change message confirmation flag, AVC voltage target value, AVC voltage reference value, AVC reactive power target value, AVC reactive power reference value, AVC reactive power upper limit value, AVC reactive power lower limit value, AVC voltage increment command, AVC reactive power increment command, and the corresponding valid bits of each command.

[0045] When the master or backup unit in either of the two automatic voltage control systems receives an instruction from the AVC dispatch master station, the valid instruction bit in the real-time instruction data is set to 1, the instruction is updated to the latest instruction issued by the master station, and the real-time instruction data is immediately forwarded to the other system. When sending a goose message, all data is packaged. When the other system parses the message, it updates the instruction if the valid instruction bit is 1; otherwise, it does not update. This effectively avoids data mistransmission between the two systems and further improves the accuracy of transmitted data.

[0046] like Figure 2As shown, the switching process between the primary and backup units of the automatic voltage control system is as follows:

[0047] A1) Determine whether the local system is in the startup state. If yes, switch the local system to standby state; otherwise, proceed to step A2.

[0048] A2) Determine if the local system is abnormal (system failure or communication interruption with the main station or reactive power equipment is considered abnormal). If so, the local system is switched to abnormal state; otherwise, proceed to step A3.

[0049] A3) Determine whether the Goose dual-network communication of the other system is disconnected. If so, switch the local system to host mode; otherwise, proceed to step A4.

[0050] A4) Determine if the system on the other side is abnormal. If so, switch the system on this side to host mode. If not, proceed to step A5.

[0051] A5) Determine if the heartbeat refresh of the other system is abnormal. If it is, switch the local system to host mode; otherwise, proceed to step A6.

[0052] A6) Determine whether the weight of the primary and backup systems on this side is greater than the weight of the system on the other side. If yes, the system on this side switches to the primary state; if not, the system on this side switches to the backup state.

[0053] When both the primary and standby units in two automatic voltage control systems use Goose communication to communicate with reactive power equipment such as inverters, both subscribe to Goose messages sent by the inverters and other reactive power equipment, and collect the equipment's operating status and reactive power data from the messages. The reactive power equipment only subscribes to Goose messages sent by the primary unit, receives and executes the reactive power remote adjustment commands sent by the primary unit, and the standby unit blocks the sending of Goose messages. When the original primary unit switches to standby, the sending of Goose messages is blocked, and the original standby unit becomes the new primary unit, begins reactive power regulation, and enables the sending of Goose messages.

[0054] In practical engineering applications, Goose transmits large amounts of data in complex network environments. To ensure rapid and complete data synchronization between two automatic voltage control systems, especially when the primary system fails, it's crucial to quickly transmit the fault signal to the backup system, allowing the backup to take over as the primary. Therefore, a positional transmission acknowledgment mechanism is used for Goose communication between the primary and backup systems. When one system sends a positional message, the status sequence number in the message is incremented by 1, and the Goose message is retransmitted at time intervals of 2ms-2ms-4ms-8ms. Upon detecting the status sequence number increment, the other system immediately replies with an acknowledgment message. If the primary system fails to receive the acknowledgment message from the other system, it continues to retransmit the Goose message at 8ms intervals until it receives the acknowledgment. After receiving the acknowledgment, the transmission frequency is reduced, and a heartbeat message is sent at 0.5s intervals. In complex network environments, this positional transmission acknowledgment mechanism reduces the impact of network packet loss on primary and backup data synchronization by increasing the transmission frequency of positional messages, further ensuring the reliability of Goose message transmission.

[0055] To prevent communication interruptions between the two automatic voltage control systems due to unpredictable factors such as power failure of the switch or loose network cable connections, a dual-network redundancy approach is used. The two systems connect to the dual networks via separate network ports and independent switches, with both networks operating simultaneously. When one system sends a Goose message to the other system, it sends the same message to both networks. The other system simultaneously receives the messages from both networks and determines whether to update its data. Figure 3 As shown, the judgment process is as follows:

[0056] B1) Determine if the parameters of the currently received message are correct. If they are, proceed to step B2; otherwise, discard the message.

[0057] B2) Determine whether the status sequence number of the currently received message is greater than the status sequence number of the previous frame message. If so, update the data according to the message; otherwise, proceed to step B3.

[0058] B3) Determine whether the current received message status sequence number is equal to the previous frame message status sequence number. If yes, proceed to step B4; otherwise, determine whether the sender has restarted the system. If yes, update the data; otherwise, discard the message.

[0059] B4) Determine whether the sequence number of the currently received message is greater than or equal to the sequence number of the previous frame message. If it is, consider the message to be a duplicate transmission message and discard the message. If not, determine whether the sender has restarted the system. If yes, update the data; otherwise, discard the message.

[0060] The two automatic voltage control systems employ a simultaneous dual-network Goose communication approach, ensuring both speed and integrity of data transmission. This avoids data transmission interruptions due to single-network failures and eliminates the delays associated with traditional Goose dual-network systems that require switching to another channel after detecting a Goose link failure, thus guaranteeing uninterrupted communication. Simultaneously, the receiver determines whether communication is interrupted and decides whether to update data. If duplicate transmissions or erroneous information transmitted due to a network failure are received, data updates are not performed, ensuring data reliability.

[0061] Based on the above technical solution, this invention is applicable to new energy power plants. The two automatic voltage control systems utilize Goose communication, which employs a data valid bit mechanism, a change transmission confirmation mechanism, and a dual-network redundant communication mechanism. This enables rapid, reliable, and uninterrupted exchange of real-time status data and real-time command data between the primary and backup systems, achieving seamless switching between them. This avoids the voltage of the new energy power plant becoming uncontrollable or even unstable due to a single device failure, thereby affecting the voltage and safety of the power grid.

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of dualizing a power plant automatic voltage control system, characterized by, Applied to new energy power plants, the new energy power plants include two automatic voltage control systems. Both automatic voltage control systems are respectively connected to the AVC dispatch master station and the reactive power equipment to collect real-time data of the reactive power equipment of the new energy power plant and issue reactive power commands. A dual-channel Goose communication is established between the two automatic voltage control systems. The two automatic voltage control systems exchange real-time status data, real-time command data, and corresponding valid bits, and use the valid bits to determine whether to update the command data. The two automatic voltage control systems use a change transmission confirmation mechanism for communication. After one system generates change information, it sends change messages at a high frequency. After receiving a confirmation message from the other system, it reduces the sending frequency. The change transmission confirmation mechanism includes: when a system sends a change message, the status sequence number in the message is incremented by 1, and the goose message is retransmitted at a first preset time interval. After the other system detects the status number incremented by 1, it immediately replies with an acknowledgment message. If the local system fails to receive the acknowledgment message from the other system, it continues to retransmit the goose message at a second preset time interval until it receives the acknowledgment message from the other system. After receiving the acknowledgment message, a heartbeat message is sent at a third preset time interval. The first preset time interval sequence is not longer than the second preset time interval, and the second preset time interval is shorter than the third preset time interval. The two systems are connected to the dual network through different network ports and their respective independent switches. The two networks work simultaneously. When one system sends a goose message to the other system, it sends the same message to both networks. The other system receives the messages from both networks at the same time and determines whether to update the data.

2. The method of claim 1, wherein the power plant automatic voltage control system dualization configuration method is characterized by, The automatic voltage control system operates in four states: startup, main unit, standby, and abnormal. Upon power-up, the automatic voltage control system first enters the startup state, after which... After a certain time, the startup state ends. In the startup state, the two automatic voltage control systems establish dual-channel Goose communication. After the communication is established, the two systems transmit real-time status data to each other.

3. The method for dual configuration of an automatic voltage control system in a power plant according to claim 2, characterized in that, The real-time status data includes change message confirmation markers, weight information, heartbeat counts, and abnormal signals.

4. The method of claim 2, wherein the method further comprises: The reactive power equipment includes an inverter, a wind turbine energy management system, and an SVG. In the startup state, both systems communicate with the AVC dispatch master station simultaneously, with the same communication point table. The two systems also communicate with the inverter, the wind turbine energy management system, and the SVG respectively, to collect real-time data of the reactive power equipment of the new energy power station and issue reactive power commands. The two systems transmit real-time command data to each other.

5. The method of claim 4, wherein the method further comprises: The real-time instruction data includes: change message confirmation flag, AVC voltage target value, AVC voltage reference value, AVC reactive power target value, AVC reactive power reference value, AVC reactive power upper limit value, AVC reactive power lower limit value, AVC voltage increment instruction, AVC reactive power increment instruction, and the corresponding valid bits of each instruction.

6. The method of claim 5, wherein the method further comprises: When the master or standby system in both systems receives an instruction from the AVC scheduling master station, the corresponding instruction validity bit in the real-time instruction data is set to 1, the instruction is updated to the latest instruction issued by the master station, and the real-time instruction data is immediately packaged into a message and sent to the other system. When the other system parses the message, it updates the instruction when the instruction validity bit is 1, otherwise it does not update.

7. The method of claim 2, wherein the method further comprises: The master or standby switchover process in the two systems is as follows: A1) Determine if the local system is in the startup state. If yes, switch the local system to standby state; otherwise, proceed to step A2. A2) Determine if the local system is abnormal. If so, switch the local system to abnormal state; otherwise, proceed to step A3. Among them, system failure or communication interruption with the main station or reactive power equipment is considered as system abnormality. A3) Determine whether the Goose dual-network communication of the other system is disconnected. If so, switch the local system to host mode; otherwise, proceed to step A4. A4) Determine if the system on the other side is abnormal. If so, switch the system on this side to host mode; otherwise, proceed to step A5. A5) Determine if the heartbeat refresh of the other system is abnormal. If it is, switch the local system to host mode; otherwise, proceed to step A6. A6) Determine whether the weight of the primary and backup systems on this side is greater than the weight of the system on the other side. If yes, the system on this side switches to the primary state; if not, the system on this side switches to the backup state.

8. The method for dual configuration of an automatic voltage control system in a power plant according to claim 1, characterized in that, When both the master and standby units in two automatic voltage control systems use Goose communication to communicate with the reactive power equipment, both the master and standby units subscribe to the Goose messages sent by the reactive power equipment and collect the equipment's power-on status and reactive power data from the messages. The reactive power equipment only subscribes to the Goose messages sent by the master unit, receives and executes the reactive power remote adjustment commands sent by the master unit, and the standby unit blocks the sending of Goose messages. When the original master unit switches to the standby unit, the sending of Goose messages is also blocked. The original standby unit then becomes the new master unit, starts reactive power regulation, and enables the Goose message sending function.

9. A dual configuration method for an automatic voltage control system in a power plant according to claim 1, characterized in that, The counterpart system simultaneously receives messages from both networks and determines whether to update data, including: B1) Determine if the parameters of the currently received message are correct. If yes, proceed to step B2; otherwise, discard the message. B2) Determine whether the status sequence number of the currently received message is greater than the status sequence number of the previous frame message. If so, update the data according to the message; otherwise, proceed to step B3. B3) Determine whether the current received message status sequence number is equal to the previous frame message status sequence number. If yes, proceed to step B4; otherwise, determine whether the sender has restarted the system. If yes, update the data; otherwise, discard the message. B4) Determine whether the sequence number of the currently received message is greater than or equal to the sequence number of the previous frame message. If it is, consider the message to be a duplicate transmission message and discard the message. If not, determine whether the sender has restarted the system. If yes, update the data; otherwise, discard the message.

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