Method and device for controlling power recovery after fault of grid-connected system of photovoltaic station

Abstract

The invention relates to a power recovery control method and device after a fault of a grid-connected system of a photovoltaic station. The method comprises the following steps: collecting current data, a protection action signal, a reclosing signal and a circuit breaker position signal of a new energy grid-connected section; based on the collected current data, the protection action signal, the reclosing signal and the circuit breaker position signal, current operation state data of the grid-connected section are obtained, and the current operation state data comprise off-grid operation state data and coincidence recovery grid-connected state data; and issuing the current operation state data to a data acquisition module of the new energy station through a special communication network, and forwarding the current operation state data to a corresponding inverter control module by using the data acquisition module of the new energy station so as to trigger a rapid locking process or a power recovery control process. By adopting the method, the problems of mismatch of control and protection time sequences and slow power recovery caused by unsmooth system-level information interaction can be effectively solved.

Description

Technical Field

[0001] This application relates to the field of power system relay protection and control technology, and in particular to a power recovery control method, device, computer equipment, computer-readable storage medium and computer program product after a fault in a photovoltaic power station grid-connected system. Background Technology

[0002] As the construction of new power systems progresses, a large number of centralized photovoltaic inverters are being connected to traditional AC power grids, and the proportion of photovoltaic capacity in regional power grids is gradually increasing. When a grid-connected line trips due to a fault and is then reclosed, the speed at which the photovoltaic inverter recovers and sends power directly affects whether the regional power grid can maintain power balance and stable operation.

[0003] In photovoltaic inverter power transmission systems, the converter control system cannot accurately perceive the current system operating conditions, resulting in disordered grid disconnection and power restoration after reclosing taking minutes or even longer. The inability to quickly exchange system-level information causes timing mismatches between control and protection. When a grid-connected line trips, if the photovoltaic inverter has not disconnected from the grid during line reclosing, it affects the reclosing verification conditions, causing the photovoltaic-side circuit breaker to fail to reclose, thus affecting power restoration. If the renewable energy system side is not equipped with fast main protection, the overall fault isolation time is long, leading to malfunctions of the disconnection device and causing power loss at the renewable energy power station. Furthermore, the reconnection process after the photovoltaic converter is blocked requires waiting for the filter capacitor to discharge and for a complete hardware self-test on both the DC and AC sides before grid connection can begin. This significantly prolongs the power restoration time at the renewable energy power station, resulting in a prolonged power shortage in the grid during the fault period and affecting the reliable operation of the system.

[0004] Therefore, there is an urgent need for a power recovery control method, device, computer equipment, computer-readable storage medium, and computer program product after a grid-connected photovoltaic power station system failure, which can effectively solve the problems of control and protection timing mismatch and slow power recovery caused by poor system-level information interaction. Summary of the Invention

[0005] Based on this, it is necessary to provide a method, device, computer equipment, computer-readable storage medium, and computer program product for power recovery control after a grid-connected photovoltaic power station system failure, which can effectively solve the problems of control and protection timing mismatch and slow power recovery caused by poor system-level information interaction.

[0006] In a first aspect, this application provides a power recovery control method for a photovoltaic power station grid-connected system after a fault, applied to a protection and control coordination device, the method comprising:

[0007] Collect current data, protection action signals, reclosing signals, and circuit breaker position signals from the grid-connected sections of new energy sources;

[0008] Based on the collected current data, protection action signals, reclosing signals, and circuit breaker position signals, the current operating status data of the grid-connected section is obtained. The current operating status data includes off-grid operating status data and reclosing and grid-connected status data.

[0009] The current operating status data is transmitted to the data acquisition module of the new energy power station through a dedicated communication network. The data acquisition module of the new energy power station then forwards the current operating status data to the corresponding inverter control module to trigger a fast lockout process or a power recovery control process.

[0010] In one embodiment, the method for identifying the off-grid operation status includes any one of the following:

[0011] The system detects a line protection trip signal on either side of the grid-connected line; detects that the circuit breaker on either side of the grid-connected line is in the open position with a corresponding current value of zero; receives a protection action signal from the step-up transformer; or detects that the circuit breaker on the high-voltage or low-voltage side of the step-up transformer is in the open position with a corresponding current value of zero.

[0012] In one embodiment, the method for identifying the reconnection and restoration of grid connection status includes:

[0013] Monitor the reclosing command output signal of the protection device on the renewable energy side of the grid-connected line;

[0014] When a reclosing command output signal is detected, the grid connection status is determined to be restored by combining the grid connection point voltage recovery status.

[0015] In one embodiment, the method further includes:

[0016] Using optical fiber as the physical transmission medium, an intra-station ring network communication architecture is constructed based on the GOOSE communication protocol.

[0017] Configure a real-time data exchange mechanism between the protection and control coordination device and the data acquisition modules of multiple new energy power stations.

[0018] In one embodiment, the method further includes:

[0019] Logical operations are performed on the collected circuit breaker position signals to generate a unified cross-section status identifier;

[0020] A time-series correlation analysis is performed on the protection action signal and the current data to verify the accuracy of the current operating status data;

[0021] The current running status data is encapsulated into a standard communication message, and a timestamp and verification information are added.

[0022] In one embodiment, the method further includes:

[0023] When a photovoltaic power station is connected to the grid through multiple main transformers or multiple lines, monitor the operating status of all main transformers and grid-connected lines;

[0024] When all main transformers are out of service or all grid-connected lines are tripped, it is determined to be in an off-grid operation state;

[0025] When the reclosing command output signal of any grid-connected line's renewable energy side protection is detected in the off-grid operation state, it is determined that the reclosing has restored the grid-connected state.

[0026] In one embodiment, the power recovery control process includes an inverter capacitor residual voltage adaptive startup method and DC-side rapid voltage boost and self-test waiting time compression measures.

[0027] Secondly, this application also provides a power recovery control device for a photovoltaic power station grid-connected system after a fault, comprising:

[0028] The data acquisition module is used to collect current data, protection action signals, reclosing signals, and circuit breaker position signals at the grid-connected sections of new energy sources.

[0029] The data processing module acquires the current operating status data of the grid-connected section based on the collected current data, protection action signals, reclosing signals, and circuit breaker position signals. The current operating status data includes off-grid operating status data and reclosing and grid-connected status data.

[0030] The control module is used to send the current operating status data to the data acquisition module of the new energy power station through a dedicated communication network, and use the data acquisition module of the new energy power station to forward the current operating status data to the corresponding inverter control module to trigger a fast lockout process or a power recovery control process.

[0031] Thirdly, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0032] Collect current data, protection action signals, reclosing signals, and circuit breaker position signals from the grid-connected sections of new energy sources;

[0033] Based on the collected current data, protection action signals, reclosing signals, and circuit breaker position signals, the current operating status data of the grid-connected section is obtained. The current operating status data includes off-grid operating status data and reclosing and grid-connected status data.

[0034] The current operating status data is transmitted to the data acquisition module of the new energy power station through a dedicated communication network. The data acquisition module of the new energy power station then forwards the current operating status data to the corresponding inverter control module to trigger a fast lockout process or a power recovery control process.

[0035] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0036] Collect current data, protection action signals, reclosing signals, and circuit breaker position signals from the grid-connected sections of new energy sources;

[0037] Based on the collected current data, protection action signals, reclosing signals, and circuit breaker position signals, the current operating status data of the grid-connected section is obtained. The current operating status data includes off-grid operating status data and reclosing and grid-connected status data.

[0038] The current operating status data is transmitted to the data acquisition module of the new energy power station through a dedicated communication network. The data acquisition module of the new energy power station then forwards the current operating status data to the corresponding inverter control module to trigger a fast lockout process or a power recovery control process.

[0039] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, performs the following steps:

[0040] Collect current data, protection action signals, reclosing signals, and circuit breaker position signals from the grid-connected sections of new energy sources;

[0041] Based on the collected current data, protection action signals, reclosing signals, and circuit breaker position signals, the current operating status data of the grid-connected section is obtained. The current operating status data includes off-grid operating status data and reclosing and grid-connected status data.

[0042] The current operating status data is transmitted to the data acquisition module of the new energy power station through a dedicated communication network. The data acquisition module of the new energy power station then forwards the current operating status data to the corresponding inverter control module to trigger a fast lockout process or a power recovery control process.

[0043] The aforementioned photovoltaic power plant grid-connected system power recovery control method, device, computer equipment, computer-readable storage medium, and computer program product, firstly, by real-time acquisition of multi-dimensional information such as grid-connected line current data, protection action signals, reclosing signals, and circuit breaker position signals, and accurately determining the off-grid operation status and reclosing / reconnection status based on preset logic conditions, achieves precise perception of the system's operating conditions. This overcomes the limitation of traditional converter control systems in accurately perceiving the system's operating status and solves the problem of control and protection timing mismatch caused by information gaps. Secondly, through a dedicated communication network, the precisely determined operating status data is rapidly transmitted to the new energy power plant's data acquisition module and forwarded to each inverter control module, establishing a high-speed information interaction channel between protection control and inverter execution. This effectively solves the technical bottleneck of the inability to quickly exchange system-level information, ensuring the real-time performance and reliability of status information transmission. Ultimately, by triggering a fast-locking process or a fast-power recovery control process, coordinated control of the photovoltaic inverter group was achieved. Timely lockout during off-grid operation prevents disorderly grid disconnection, and rapid response during reconnection shortens the power recovery time, reducing the traditional minute-level power recovery process to the second level. This significantly reduces the power deficit during grid faults, improves the power balance capability and stable operation level of the regional power grid, and effectively solves the problem of slow power recovery after faults in grids with a high proportion of renewable energy. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is an application environment diagram of a power recovery control method for a photovoltaic power station grid-connected system after a fault, as shown in one embodiment.

[0046] Figure 2 This is a flowchart illustrating a power recovery control method for a photovoltaic power station grid-connected system after a fault, as shown in one embodiment.

[0047] Figure 3 This is a schematic diagram of the power fast recovery system device configuration in one embodiment;

[0048] Figure 4 This is a flowchart illustrating a power recovery control method for a photovoltaic power station grid-connected system after a fault, as shown in another embodiment.

[0049] Figure 5 This is a schematic diagram of a power fast recovery system in one embodiment;

[0050] Figure 6 This is a structural block diagram of a power recovery control device for a photovoltaic power station grid-connected system after a fault, as shown in one embodiment.

[0051] Figure 7 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0053] It should be noted that the terms "first," "second," etc., used in this application can be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element. The terms "comprising" and "having," and any variations thereof, used in this application, are intended to cover non-exclusive inclusion. The term "multiple" used in this application refers to two or more. The term "and / or" used in this application refers to one of the embodiments, or any combination of multiple embodiments.

[0054] The power recovery control method for photovoltaic power station grid-connected systems after a fault, provided in this application embodiment, can be applied to, for example... Figure 1 In the application environment shown, terminal 102 communicates with server 104 via a network. A data storage system can store the data that server 104 needs to process. The data storage system can be integrated onto server 104, or it can be located in the cloud or on another network server.

[0055] Server 104 collects current data, protection action signals, reclosing signals, and circuit breaker position signals from the grid-connected section of the new energy source through terminal 102. Based on the collected current data, protection action signals, reclosing signals, and circuit breaker position signals, server 104 obtains the current operating status data of the grid-connected section, which includes off-grid operating status data and reclosing recovery grid-connected status data. The current operating status data is then transmitted to the data acquisition module of the new energy power station through a dedicated communication network. The data acquisition module of the new energy power station forwards the current operating status data to the corresponding inverter control module to trigger a fast blocking process or a power recovery control process.

[0056] The terminal 102 can be, but is not limited to, various personal computers, laptops, smartphones, tablets, IoT devices, and portable wearable devices. IoT devices can include smart speakers, smart TVs, smart air conditioners, smart in-vehicle systems, and projection devices. Portable wearable devices can include smartwatches, smart bracelets, and head-mounted displays. Head-mounted displays can be virtual reality (VR) devices, augmented reality (AR) devices, and smart glasses. The server 104 can be a standalone physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services.

[0057] In one exemplary embodiment, such as Figure 2 As shown, a power recovery control method for a photovoltaic power station grid-connected system after a fault is provided, and this method is applied to a protection and control coordination device (i.e., Figure 1 Taking server 104 as an example, the explanation includes the following steps S202 to S206. Wherein:

[0058] Step S202: Collect current data, protection action signals, reclosing signals, and circuit breaker position signals from the new energy grid-connected section.

[0059] Specifically, firstly, the new energy grid connection section is a logical electrical boundary point, and its physical scope covers the grid connection lines connecting the photovoltaic power station to the public power grid (such as...). Figure 3 Both sides of the L1 line and the step-up transformer (such as Figure 3 The relevant electrical connection points of (T1). Monitoring the status of this section is equivalent to monitoring whether the entire photovoltaic power station is connected to the grid.

[0060] Current data refers to the current data transmitted through the lines installed on both sides of the grid connection (e.g., ... Figure 3 The real-time current value measured by the current transformer (near the QF1 and QF2 circuit breakers). This data is used to determine whether the line is under load or without current, and is a key basis for determining whether the electrical connection is truly broken.

[0061] Protection action signals refer to tripping signals issued by relay protection equipment such as line protection devices and transformer protection devices after detecting a fault (such as a short circuit or overcurrent). This signal is a switching signal and is direct evidence that a system fault has occurred and has been isolated.

[0062] The reclosing signal refers to the protection device (such as...) located on the side of the grid-connected line near the new energy power station. Figure 3 The protection device (close to QF1) automatically issues a circuit breaker reclosing command after a fault trip, provided that preset conditions are met. This signal marks the starting point for the system's attempt to restore grid-connected operation from a fault-isolated state.

[0063] Circuit breaker position signals refer to auxiliary contact signals (closed or open) that directly reflect the actual physical positions of the circuit breakers (QF1, QF2) on both sides of the grid-connected line and the high- and low-voltage side circuit breakers (QF3, QF4) of the step-up transformer. This signal provides the most intuitive and basic status information of the primary wiring structure of the power grid.

[0064] The protection and control coordination device obtains the above-mentioned multi-source, heterogeneous operating parameters synchronously or quasi-synchronously from the corresponding instrument transformers, protection devices and circuit breaker operating mechanisms through the station communication network (such as the IEC 61850 MMS network) and necessary hard-wired interfaces.

[0065] Step S204: Based on the collected current data, protection action signals, reclosing signals, and circuit breaker position signals, obtain the current operating status data of the grid-connected section. The current operating status data includes off-grid operating status data and reclosing and grid-connected status data.

[0066] Specifically, off-grid operation status refers to the state in which the electrical connection between the photovoltaic power station and the main power grid is completely disconnected. The determination of this status is based on an "OR" logical relationship, that is, when a preset condition is met, off-grid operation status data is generated immediately (for example, the status flag is set to 1).

[0067] Reclosing and restoring grid connection refers to the process by which the system has recovered from the fault and is actively restoring grid connection. Determining this state is a combination of timing and conditions: the system must first be in or have just left the aforementioned off-grid operation state. Subsequently, the protection and control coordination device detects the reclosing command output signal from the renewable energy side protection device of the grid-connected line. This signal is an explicit instruction for the system to initiate the recovery procedure.

[0068] In a preferred embodiment, monitoring of the grid connection point voltage can be further incorporated (voltage data also falls under the category of collected electrical quantities). When the voltage recovers to the rated allowable range, the reconnection recovery grid connection status data is finally determined and generated (for example, the status flag is set to 2).

[0069] Step S206: The current operating status data is sent to the data acquisition module of the new energy power station through a dedicated communication network. The data acquisition module of the new energy power station then forwards the current operating status data to the corresponding inverter control module to trigger a fast lockout process or a power recovery control process.

[0070] Specifically, the protection and control coordination device will identify and generate uniformly formatted current operating status data (i.e., off-grid or reconnection recovery status identifiers) and distribute it through the dedicated communication network. This network preferably uses optical fiber as the physical medium and is constructed using communication protocols with high transmission rates and determinism, such as IEC 61850 GOOSE. This ensures that status information can traverse the entire photovoltaic power station at millisecond speeds and reach the data acquisition modules of each photovoltaic subarray, overcoming the bottleneck of large communication delays in traditional control systems.

[0071] The data acquisition module, distributed across each photovoltaic subarray, acts as a local communication hub, responsible for receiving global status commands from the protection and control coordination device. Subsequently, this module performs protocol conversion or data forwarding functions, broadcasting or distributing the aforementioned status data point-to-point to the control module of each inverter within its jurisdiction via the subarray's internal communication network (such as PLC carrier communication or fieldbus). The data acquisition module plays a crucial role in information relay and adaptation, ensuring the effective transmission of commands.

[0072] After receiving authoritative status data forwarded by the data acquisition module, each inverter control module immediately initiates the corresponding preset control logic to complete the final power control action: when receiving off-grid operation status data, it immediately triggers the fast lockout process, that is, unconditionally stops the inverter's trigger pulse, reducing its power output to zero, thereby avoiding risks such as overvoltage caused by the islanded operation of the substation.

[0073] Upon receiving the data indicating that the inverter has reconnected to the grid, the power recovery control process is immediately triggered. This involves using optimized algorithms such as adaptive startup with residual capacitor voltage and skipping lengthy self-tests to control the inverter to quickly synchronize with the grid and increase power output.

[0074] In the aforementioned power recovery control method for photovoltaic power plant grid-connected systems after a fault, firstly, by real-time acquisition of multi-dimensional information such as grid-connected line current data, protection action signals, reclosing signals, and circuit breaker position signals, and based on preset logic conditions, the off-grid operation status and reclosing / reconnection status are accurately determined. This achieves precise perception of the system's operating conditions, overcoming the limitation of traditional converter control systems that cannot accurately perceive the system's operating status, and solving the problem of control and protection timing mismatch caused by information loss. Secondly, the accurately determined operating status data is rapidly transmitted to the new energy power plant's data acquisition module via a dedicated communication network and forwarded to each inverter control module, establishing a high-speed information interaction channel between protection control and inverter execution. This effectively solves the technical bottleneck of the inability to quickly exchange system-level information, ensuring the real-time performance and reliability of status information transmission. Ultimately, by triggering a fast-locking process or a fast-power recovery control process, coordinated control of the photovoltaic inverter group was achieved. Timely lockout during off-grid operation prevents disorderly grid disconnection, and rapid response during reconnection shortens the power recovery time, reducing the traditional minute-level power recovery process to the second level. This significantly reduces the power deficit during grid faults, improves the power balance capability and stable operation level of the regional power grid, and effectively solves the problem of slow power recovery after faults in grids with a high proportion of renewable energy.

[0075] In one exemplary embodiment, the method for identifying off-grid operation status includes any one of the following:

[0076] The system detects a line protection trip signal on either side of the grid-connected line; detects that the circuit breaker on either side of the grid-connected line is in the open position with a corresponding current value of zero; receives a protection action signal from the step-up transformer; or detects that the circuit breaker on the high-voltage or low-voltage side of the step-up transformer is in the open position with a corresponding current value of zero.

[0077] Specifically, the identification of off-grid operation status is based on a multi-condition parallel judgment logic architecture. This status determination satisfies an "OR" logical relationship; that is, as long as any of the following preset conditions are met, the protection control coordination device determines that the grid-connected section is in off-grid operation status and generates a corresponding status identifier:

[0078] Condition 1 (Direct Protection Action Criterion): A line protection trip signal is detected on either side of the grid-connected line (grid side or renewable energy side) and is in a valid state. This signal is the most direct and highest priority evidence that a system fault has occurred and has been confirmed and isolated by the protection device.

[0079] Condition 2 (Combined Criterion of Mechanical Position and Electrical Status): The circuit breaker on either side of the grid-connected line is detected to be in the open position, and the corresponding current value of the line is measured by a high-precision current transformer to be lower than the preset no-current setting (this setting is usually set to a threshold close to zero to distinguish it from normal load current). The combined criteria jointly confirm that the line is not only mechanically disconnected, but also completely electrically isolated, with no power exchange.

[0080] Condition 3 (Main Equipment Fault Criterion): If an action signal is received from the non-electrical quantity protection (such as gas protection) or electrical quantity protection (such as differential protection, overcurrent protection) of the step-up transformer body, this criterion indicates that the core main equipment in the station has failed, and its protection action will inevitably lead to the disconnection of the station from the power grid.

[0081] Condition 4 (Transformer Unit Shutdown Criterion): The circuit breaker on the high-voltage side or low-voltage side of the step-up transformer is detected to be in the open position and the corresponding current value is zero. This criterion covers off-grid scenarios caused by planned shutdown or non-fault shutdown of the transformer unit, ensuring the completeness of status identification.

[0082] In this embodiment, when any of the above conditions are met, the device will immediately set the off-grid operation status flag. This determination process has high reliability and high real-time performance, providing an accurate basis for the activation of subsequent control strategies.

[0083] In one exemplary embodiment, the identification method for reconnection and grid restoration includes:

[0084] Monitor the reclosing command output signal of the protection device on the renewable energy side of the grid-connected line;

[0085] When a reclosing command output signal is detected, the grid connection status is determined to be restored by combining the grid connection point voltage recovery status.

[0086] Specifically, the process of identifying the overlapping and restored grid connection status includes two levels of condition verification:

[0087] Primary condition: Monitoring reclosing commands (action intent). The protection control coordination device continuously monitors the reclosing commands issued by the protection devices on the renewable energy power station side of the grid-connected line. This command typically exists as a specific, transient, or sustained switching signal (level change) or a communication message conforming to a specific protocol. The output of this command indicates that the line protection device has determined, based on its internal logic (such as delay after fault clearance, no-voltage detection, or synchronization condition fulfillment), that the system has the conditions to restore power supply and has formally issued a reclosing instruction. This is the starting marker and direct drive signal for the system's attempt to restore grid connection from an off-grid state.

[0088] Verification conditions: Based on the grid connection point voltage recovery status (action effect), the grid connection status is finally determined to be restored only when a valid reclosing command output signal is detected and the grid connection point voltage is simultaneously monitored to have returned to normal. The grid connection point voltage recovery status refers to the three-phase voltage values ​​at the grid connection point measured in real time by the voltage transformer, which must simultaneously meet the following conditions: a) Voltage amplitude condition: The voltage values ​​of each phase have recovered to the preset threshold range of the rated voltage (e.g., 85% to 110% of the rated voltage). b) Voltage stability condition: The voltage values ​​have maintained a very short period of stability within the above normal range (e.g., 1-3 power frequency cycles) to eliminate transient interference.

[0089] It confirmed that the reclosing command was not an empty instruction and that its execution had produced a practical effect. The grid-side power supply had been successfully delivered to the grid connection point, providing a stable and normal voltage reference source for the reconnection of the photovoltaic inverter. This effectively prevented the inverter from being mistakenly triggered to connect to the grid when reclosing at the fault point under permanent line faults, thus ensuring equipment safety.

[0090] In this embodiment, this dual verification mechanism constitutes a rigorous and secure state transition criterion, providing accurate and reliable triggering conditions for the inverter control module to execute the power fast recovery process.

[0091] In one exemplary embodiment, optical fiber is used as the physical transmission medium, and an intra-station ring network communication architecture is constructed based on the GOOSE communication protocol.

[0092] Configure a real-time data exchange mechanism between the protection and control coordination device and the data acquisition modules of multiple new energy power stations.

[0093] Specifically, a dedicated communication network is established between the protection and control coordination device and the data acquisition module of the new energy power station to achieve data interaction. Optical fiber communication is preferentially used as the physical medium for this dedicated communication network, and the common GOOSE protocol is preferred for network formation.

[0094] like Figure 3 As shown, the data acquisition modules corresponding to each subarray of the photovoltaic power station and the protection and control coordination device of the booster station jointly form an internal ring network communication architecture to realize information interaction between the corresponding equipment of the photovoltaic power station and effectively compress data transmission time through the fiber optic ring network.

[0095] In this embodiment, firstly, the optical fiber medium provides high bandwidth and strong anti-electromagnetic interference capability, ensuring the transmission quality and stability of critical control signals in complex power plant environments; secondly, the active publish / subscribe mechanism and millisecond-level transmission characteristics of the GOOSE protocol, combined with the physical redundancy of the ring network architecture, jointly realize the extremely fast, deterministic, and highly reliable distribution of status information across devices within the station, completely overcoming the bottlenecks of large delays and poor timeliness in traditional polling communication; finally, a dedicated communication network is built between the protection control coordination device and the inverters throughout the field, enabling the macroscopic system status judgment results to be instantly transformed into unified and coordinated control commands for the distributed inverter group, providing fundamental communication guarantees for achieving second-level coordinated control from fault detection to power recovery.

[0096] In an exemplary embodiment, the communication method between the data acquisition module and the inverter control module can be various, such as PLC carrier communication or fiber optic communication. Where site conditions permit, the fastest communication method is preferred. When the inverter sends a signal indicating a shutdown state or the inverter control signal is offline, the inverter is determined to be in an uncontrollable state; when the inverter control signal is online and the inverter is currently in operation, the inverter is determined to be in a controllable state. The protection and control coordination device summarizes the controllable state of each subarray inverter.

[0097] Specifically, the inverter control module is responsible for receiving system operating status information and determining whether the inverter has entered the fast lockout and power fast recovery control process. The inverter entering the fast lockout process means that the inverter control module receives an off-grid operation status signal from the protection control coordination device, indicating that the photovoltaic power station is in off-grid operation mode. This stops the inverter trigger pulse signal and controls the photovoltaic inverter power output to zero.

[0098] like Figure 3 As shown, when the grid-connected photovoltaic side line protection trips the QF1 circuit breaker, the protection control coordination device determines that the section is in off-grid operation mode. It then sends a signal to the inverter control module via the data acquisition module through GOOSE communication. Upon receiving this signal, the inverter control module stops the inverter pulse trigger signal, and the inverter is in a locked state, resulting in zero power output from the photovoltaic inverter. This control adjustment achieved through the above information interaction avoids problems such as overvoltage within the power station caused by disordered control of the photovoltaic inverter during off-grid operation.

[0099] By prioritizing the use of high-speed communication methods such as fiber optics when on-site conditions permit, the real-time transmission of status information and control commands within the subarrays is ensured, providing communication support for subsequent rapid blocking and power recovery control, and effectively reducing the overall system response time. Secondly, by comprehensively judging the inverter operating status and the online status of control signals, the protection and control coordination device can clearly grasp the actual controllable capabilities of each inverter in the entire station, avoiding sending invalid commands to uncontrollable equipment and significantly improving the accuracy and reliability of control strategy execution. Finally, by centrally summarizing the controllable status of each subarray inverter, the protection and control coordination device obtains a panoramic view of the controllable resources of the entire station, providing data support for optimizing control strategies. This enables the system to accurately mobilize all available power generation units during power recovery, maximizing recovery efficiency, while providing accurate controllable capacity information for the power grid dispatch, enhancing the grid's perception and control capabilities over new energy power plants.

[0100] In one exemplary embodiment, the method further includes:

[0101] Logical operations are performed on the collected circuit breaker position signals to generate a unified section status identifier;

[0102] A time-series correlation analysis was performed between the protection action signals and current data to verify the accuracy of the current operating status data;

[0103] The current running status data is encapsulated into a standard communication message, and a timestamp and verification information are added.

[0104] Specifically, multi-source signal fusion processing involves performing logical AND and OR operations on multiple collected circuit breaker position signals to generate a unified identifier that comprehensively characterizes the electrical connection status of the entire grid-connected section. This processing fuses dispersed switching signals into high-level state variables with clear semantics, providing clear logical input for subsequent state determination.

[0105] A time-series correlation analysis is performed on the protection action signal and current data to verify the accuracy of the state determination. When a protection action signal is received, current data within the same time period is retrieved. By analyzing the signal time-series correlation and electrical characteristic matching degree, the authenticity of the protection action is verified, ensuring that the state determination result has high reliability.

[0106] The final determined operating status data is encapsulated according to the standard data model of the preset communication protocol to form standard communication messages. During the encapsulation process, a timestamp accurate to the millisecond level is added to each message to provide a unified timing reference for all devices in the station; at the same time, a cyclic redundancy check code is added so that the receiver can verify the integrity of the message transmission and prevent communication interference from causing control command errors.

[0107] In this embodiment, a series of data processing and security hardening measures jointly constitute a quality assurance system for the generation and transmission of status information, ensuring the accuracy, timeliness and reliability of control commands, and laying a solid foundation for the precise execution of subsequent rapid power recovery control.

[0108] In one exemplary embodiment, such as Figure 4 As shown, when a photovoltaic power station is connected to the grid through multiple main transformers or multiple lines, the operating status of all main transformers and grid-connected lines is monitored.

[0109] Step S402: When all main transformers are out of service or all grid-connected lines are tripped, the system is determined to be in an off-grid operation state.

[0110] Step S404: When the reclosing command output signal of any grid-connected line's new energy side protection is detected in the off-grid operation state, it is determined that the reclosing has restored the grid-connected state.

[0111] Specifically, under the premise that the entire field is determined to be in an off-grid operation state, the device synchronously monitors the reclosing commands of the renewable energy side protection devices of all grid-connected lines. Once a valid reclosing command is detected from any renewable energy side protection device of any grid-connected line, it is considered that the system has started the global recovery procedure, and the entire field status is immediately updated and identified as reclosing and restoring grid connection. This mechanism ensures that any recovery attempt of any grid-connected channel can be captured in a timely manner and triggers all inverters in the field to enter the power fast recovery preparation process, thereby maximizing the efficiency and opportunity of power recovery.

[0112] In this embodiment, the extended discrimination mechanism, through comprehensive processing and logical integration of information from multiple grid connection points, enables this protection and control coordination method to adapt to various complex site wiring configurations, ensuring the adaptability and reliability of status discrimination in various operating scenarios.

[0113] In one embodiment, the inverter power fast recovery control process includes an inverter capacitor residual voltage adaptive startup method and DC-side fast voltage boost and self-test waiting time compression measures.

[0114] The inverter capacitor residual voltage adaptive start-up method specifies the target values ​​for three-phase voltage control at the inverter ports as follows:

[0115] ;

[0116] in, , , These represent the target values ​​for three-phase voltage control at inverter ports A, B, and C, respectively.

[0117] , , These represent the residual voltages of the three phases A, B, and C of the AC side filter capacitors of the inverter, respectively.

[0118] like Figure 5 In this circuit, a single inverter includes a power electronic converter, an LC filter, and an AC relay, and simultaneously possesses the capability to acquire port voltage PT1, capacitor voltage PT2, and grid-side voltage PT3. When the inverter is locked out, the AC relay is simultaneously triggered to trip, at which point the capacitor voltage is in a discharging state. The capacitor residual voltage adaptive start-up method, as shown in the diagram, uses the current residual capacitor voltage as the control target for the port voltage. Through this closed-loop control, the starting current in inductor L can be reduced to a minimum, ensuring the reliability of the converter during restart.

[0119] The DC-side rapid boost and self-test waiting time compression measures are as follows: When the inverter control module receives the off-grid operation status signal, it determines that an external system fault has occurred. The DC-side BOOST control pulse is quickly restored after a short-term lockout. Preferably, the short-term lockout time of the DC-side BOOST control pulse is 200ms. The DC-side bus voltage is always in a boost hot standby state, which enables rapid AC-side connection. When the inverter control module receives the reclosing and grid-connected status signal, it simultaneously determines that the AC grid-side voltage has returned to normal operation. The inverter control module does not need to perform DC-side self-test judgment and directly sends the inverter trigger pulse to control the inverter port voltage output.

[0120] like Figure 5 In this scheme, after the inverter control module receives the off-grid operation status signal, the DC-side BOOST is briefly locked and then restarted. The DC side of the converter is always in a voltage-enabled state, and the BOOST start-up and reclosing wait are completed in parallel. When the inverter control module receives the reclosing and grid-connected status restoration signal, and the three-phase voltage of PT3 is normal, the control module directly sends an inverter trigger pulse to control the voltage output of PT1 at the inverter port. At the same time, the initial output voltage value of PT1 is targeted to be consistent with the capacitor voltage PT2, and then the control voltage gradually rises until it is synchronized with the PT3 voltage. The amplitude and phase of the two are close, reducing the impact caused by closing the AC relay.

[0121] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0122] Based on the same inventive concept, this application also provides a photovoltaic power recovery control device for implementing the above-mentioned photovoltaic power plant grid-connected system power recovery control method after a fault. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more embodiments of the photovoltaic power plant grid-connected system power recovery control device provided below can be found in the limitations of the photovoltaic power plant grid-connected system power recovery control method above, and will not be repeated here.

[0123] In one exemplary embodiment, such as Figure 6 As shown, a power recovery control device for a photovoltaic power station grid-connected system after a fault is provided, comprising:

[0124] The data acquisition module 602 is used to acquire current data, protection action signals, reclosing signals, and circuit breaker position signals of the new energy grid-connected section.

[0125] The data processing module 604 is used to acquire the current operating status data of the grid-connected section based on the collected current data, protection action signals, reclosing signals and circuit breaker position signals. The current operating status data includes off-grid operating status data and reclosing and grid-connected status data.

[0126] The control module 606 is used to send the current operating status data to the data acquisition module of the new energy power station through a dedicated communication network, and to use the data acquisition module of the new energy power station to forward the current operating status data to the corresponding inverter control module to trigger the fast lockout process or power recovery control process.

[0127] In one exemplary embodiment, the method for identifying off-grid operation status includes any one of the following:

[0128] The system detects a line protection trip signal on either side of the grid-connected line; detects that the circuit breaker on either side of the grid-connected line is in the open position with a corresponding current value of zero; receives a protection action signal from the step-up transformer; or detects that the circuit breaker on the high-voltage or low-voltage side of the step-up transformer is in the open position with a corresponding current value of zero.

[0129] In one exemplary embodiment, the identification method for reconnection and grid restoration includes:

[0130] Monitor the reclosing command output signal of the protection device on the renewable energy side of the grid-connected line;

[0131] When a reclosing command output signal is detected, the grid connection status is determined to be restored by combining the grid connection point voltage recovery status.

[0132] In one exemplary embodiment, the device further includes a construction module for constructing an intra-station ring network communication architecture based on the GOOSE communication protocol using optical fiber as the physical transmission medium; and configuring a real-time data exchange mechanism between the protection and control coordination device and the data acquisition modules of multiple new energy power stations.

[0133] In an exemplary embodiment, the data processing module 604 is further configured to perform logical operations on the collected multiple circuit breaker position signals to generate a unified cross-section status identifier; perform time-series correlation analysis on the protection action signals and current data to verify the accuracy of the current operating status data; encapsulate the current operating status data into a standard communication message and add a timestamp and verification information.

[0134] In an exemplary embodiment, the control module 606 is further configured to monitor the operating status of all main transformers and grid-connected lines when the photovoltaic power station is connected to the grid through multiple main transformers or multiple lines; determine the off-grid operation state when all main transformers are out of service or all grid-connected lines are tripped; and determine the reclosing and grid-connected state when a reclosing command output signal is detected on the renewable energy side protection of any grid-connected line in the off-grid operation state.

[0135] The modules in the power recovery control device after a grid-connected photovoltaic power station failure can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0136] In one exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 7As shown, the computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores current data, protection action signals, reclosing signals, and circuit breaker position signals for the renewable energy grid-connected sections. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When executed by the processor, the computer program implements a power recovery control method for a photovoltaic power station grid-connected system after a fault.

[0137] Those skilled in the art will understand that Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0138] In one exemplary embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0139] Collect current data, protection action signals, reclosing signals, and circuit breaker position signals from the grid-connected sections of new energy sources;

[0140] Based on the collected current data, protection action signals, reclosing signals, and circuit breaker position signals, the current operating status data of the grid-connected section is obtained. The current operating status data includes off-grid operating status data and reclosing and grid-connected status data.

[0141] The current operating status data is transmitted to the data acquisition module of the new energy power station through a dedicated communication network. The data acquisition module of the new energy power station then forwards the current operating status data to the corresponding inverter control module to trigger a fast lockout process or a power recovery control process.

[0142] In one embodiment, the method for identifying off-grid operation status includes any one of the following:

[0143] The system detects a line protection trip signal on either side of the grid-connected line; detects that the circuit breaker on either side of the grid-connected line is in the open position with a corresponding current value of zero; receives a protection action signal from the step-up transformer; or detects that the circuit breaker on the high-voltage or low-voltage side of the step-up transformer is in the open position with a corresponding current value of zero.

[0144] In one embodiment, the method for identifying the reconnection and restoration of grid connection status includes:

[0145] Monitor the reclosing command output signal of the protection device on the renewable energy side of the grid-connected line;

[0146] When a reclosing command output signal is detected, the grid connection status is determined to be restored by combining the grid connection point voltage recovery status.

[0147] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0148] Using optical fiber as the physical transmission medium, an intra-station ring network communication architecture is constructed based on the GOOSE communication protocol.

[0149] Configure a real-time data exchange mechanism between the protection and control coordination device and the data acquisition modules of multiple new energy power stations.

[0150] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0151] Logical operations are performed on the collected circuit breaker position signals to generate a unified section status identifier;

[0152] A time-series correlation analysis was performed between the protection action signals and current data to verify the accuracy of the current operating status data;

[0153] The current running status data is encapsulated into a standard communication message, and a timestamp and verification information are added.

[0154] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0155] When a photovoltaic power station is connected to the grid through multiple main transformers or multiple lines, monitor the operating status of all main transformers and grid-connected lines;

[0156] When all main transformers are out of service or all grid-connected lines are tripped, it is determined to be in an off-grid operation state;

[0157] When the reclosing command output signal of any grid-connected line's renewable energy side protection is detected in the off-grid operation state, it is determined that the reclosing has restored the grid-connected state.

[0158] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0159] Collect current data, protection action signals, reclosing signals, and circuit breaker position signals from the grid-connected sections of new energy sources;

[0160] Based on the collected current data, protection action signals, reclosing signals, and circuit breaker position signals, the current operating status data of the grid-connected section is obtained. The current operating status data includes off-grid operating status data and reclosing and grid-connected status data.

[0161] The current operating status data is transmitted to the data acquisition module of the new energy power station through a dedicated communication network. The data acquisition module of the new energy power station then forwards the current operating status data to the corresponding inverter control module to trigger a fast lockout process or a power recovery control process.

[0162] In one embodiment, the method for identifying off-grid operation status includes any one of the following:

[0163] The system detects a line protection trip signal on either side of the grid-connected line; detects that the circuit breaker on either side of the grid-connected line is in the open position with a corresponding current value of zero; receives a protection action signal from the step-up transformer; or detects that the circuit breaker on the high-voltage or low-voltage side of the step-up transformer is in the open position with a corresponding current value of zero.

[0164] In one embodiment, the method for identifying the reconnection and restoration of grid connection status includes:

[0165] Monitor the reclosing command output signal of the protection device on the renewable energy side of the grid-connected line;

[0166] When a reclosing command output signal is detected, the grid connection status is determined to be restored by combining the grid connection point voltage recovery status.

[0167] In one embodiment, when the computer program is executed by a processor, it further performs the following steps:

[0168] Using optical fiber as the physical transmission medium, an intra-station ring network communication architecture is constructed based on the GOOSE communication protocol.

[0169] Configure a real-time data exchange mechanism between the protection and control coordination device and the data acquisition modules of multiple new energy power stations.

[0170] In one embodiment, when the computer program is executed by a processor, it further performs the following steps:

[0171] Logical operations are performed on the collected circuit breaker position signals to generate a unified section status identifier;

[0172] A time-series correlation analysis was performed between the protection action signals and current data to verify the accuracy of the current operating status data;

[0173] The current running status data is encapsulated into a standard communication message, and a timestamp and verification information are added.

[0174] In one embodiment, when the computer program is executed by a processor, it further performs the following steps:

[0175] When a photovoltaic power station is connected to the grid through multiple main transformers or multiple lines, monitor the operating status of all main transformers and grid-connected lines;

[0176] When all main transformers are out of service or all grid-connected lines are tripped, it is determined to be in an off-grid operation state;

[0177] When the reclosing command output signal of any grid-connected line's renewable energy side protection is detected in the off-grid operation state, it is determined that the reclosing has restored the grid-connected state.

[0178] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0179] Collect current data, protection action signals, reclosing signals, and circuit breaker position signals from the grid-connected sections of new energy sources;

[0180] Based on the collected current data, protection action signals, reclosing signals, and circuit breaker position signals, the current operating status data of the grid-connected section is obtained. The current operating status data includes off-grid operating status data and reclosing and grid-connected status data.

[0181] The current operating status data is transmitted to the data acquisition module of the new energy power station through a dedicated communication network. The data acquisition module of the new energy power station then forwards the current operating status data to the corresponding inverter control module to trigger a fast lockout process or a power recovery control process.

[0182] In one embodiment, the method for identifying off-grid operation status includes any one of the following:

[0183] The system detects a line protection trip signal on either side of the grid-connected line; detects that the circuit breaker on either side of the grid-connected line is in the open position with a corresponding current value of zero; receives a protection action signal from the step-up transformer; or detects that the circuit breaker on the high-voltage or low-voltage side of the step-up transformer is in the open position with a corresponding current value of zero.

[0184] In one embodiment, the method for identifying the reconnection and restoration of grid connection status includes:

[0185] Monitor the reclosing command output signal of the protection device on the renewable energy side of the grid-connected line;

[0186] When a reclosing command output signal is detected, the grid connection status is determined to be restored by combining the grid connection point voltage recovery status.

[0187] In one embodiment, when the computer program is executed by a processor, it further performs the following steps:

[0188] Using optical fiber as the physical transmission medium, an intra-station ring network communication architecture is constructed based on the GOOSE communication protocol.

[0189] Configure a real-time data exchange mechanism between the protection and control coordination device and the data acquisition modules of multiple new energy power stations.

[0190] In one embodiment, when the computer program is executed by a processor, it further performs the following steps:

[0191] Logical operations are performed on the collected circuit breaker position signals to generate a unified section status identifier;

[0192] A time-series correlation analysis was performed between the protection action signals and current data to verify the accuracy of the current operating status data;

[0193] The current running status data is encapsulated into a standard communication message, and a timestamp and verification information are added.

[0194] In one embodiment, when the computer program is executed by a processor, it further performs the following steps:

[0195] When a photovoltaic power station is connected to the grid through multiple main transformers or multiple lines, monitor the operating status of all main transformers and grid-connected lines;

[0196] When all main transformers are out of service or all grid-connected lines are tripped, it is determined to be in an off-grid operation state;

[0197] When the reclosing command output signal of any grid-connected line's renewable energy side protection is detected in the off-grid operation state, it is determined that the reclosing has restored the grid-connected state.

[0198] 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.

[0199] 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 memory 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). 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, artificial intelligence (AI) processors, etc., and are not limited to these.

[0200] 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 application.

[0201] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A power recovery control method for a photovoltaic power station grid-connected system after a fault, characterized in that, The method, applied to a protection and control coordination device, includes: Collect current data, protection action signals, reclosing signals, and circuit breaker position signals from the grid-connected sections of new energy sources; Based on the collected current data, protection action signals, reclosing signals, and circuit breaker position signals, the current operating status data of the grid-connected section is obtained. The current operating status data includes off-grid operating status data and reclosing and grid-connected status data. The current operating status data is transmitted to the data acquisition module of the new energy power station through a dedicated communication network. The data acquisition module of the new energy power station then forwards the current operating status data to the corresponding inverter control module to trigger a fast lockout process or a power recovery control process.

2. The method according to claim 1, characterized in that, The method for identifying the off-grid operation status includes any one of the following: The system detects a line protection trip signal on either side of the grid-connected line; detects that the circuit breaker on either side of the grid-connected line is in the open position with a corresponding current value of zero; receives a protection action signal from the step-up transformer; or detects that the circuit breaker on the high-voltage or low-voltage side of the step-up transformer is in the open position with a corresponding current value of zero.

3. The method according to claim 1, characterized in that, The identification methods for the reconnection and restoration of grid connection status include: Monitor the reclosing command output signal of the protection device on the renewable energy side of the grid-connected line; When a reclosing command output signal is detected, the grid connection status is determined to be restored by combining the grid connection point voltage recovery status.

4. The method according to claim 1, characterized in that, The method further includes: Using optical fiber as the physical transmission medium, an intra-station ring network communication architecture is constructed based on the GOOSE communication protocol. Configure a real-time data exchange mechanism between the protection and control coordination device and the data acquisition modules of multiple new energy power stations.

5. The method according to claim 1, characterized in that, The method further includes: Logical operations are performed on the collected circuit breaker position signals to generate a unified cross-section status identifier; A time-series correlation analysis is performed on the protection action signal and the current data to verify the accuracy of the current operating status data; The current running status data is encapsulated into a standard communication message, and a timestamp and verification information are added.

6. The method according to claim 1, characterized in that, The method further includes: When a photovoltaic power station is connected to the grid through multiple main transformers or multiple lines, monitor the operating status of all main transformers and grid-connected lines; When all main transformers are out of service or all grid-connected lines are tripped, it is determined to be in an off-grid operation state; When the reclosing command output signal of any grid-connected line's renewable energy side protection is detected in the off-grid operation state, it is determined that the reclosing has restored the grid-connected state.

7. The method according to claim 1, characterized in that, The power recovery control process includes an inverter capacitor residual voltage adaptive startup method and DC-side rapid voltage boost and self-test waiting time compression measures.

8. A power recovery control device for a photovoltaic power station grid-connected system after a fault, characterized in that, The device includes: The data acquisition module is used to collect current data, protection action signals, reclosing signals, and circuit breaker position signals at the grid-connected sections of new energy sources. The data processing module acquires the current operating status data of the grid-connected section based on the collected current data, protection action signals, reclosing signals, and circuit breaker position signals. The current operating status data includes off-grid operating status data and reclosing and grid-connected status data. The control module is used to send the current operating status data to the data acquisition module of the new energy power station through a dedicated communication network, and use the data acquisition module of the new energy power station to forward the current operating status data to the corresponding inverter control module to trigger a fast lockout process or a power recovery control process.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

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