Grid-connected point switch control and data uploading device and stock power station scheduling method

Abstract

The invention relates to the technical field of power grid switch control, in particular to a grid-connected point switch control and data uploading device and a stock power station scheduling method. The system is composed of an FTU main body module, a power supply adaptation module, a signal conversion module, a communication module and a control execution module, and remote control and data interaction of a scheduling end on a stock power station are realized through modularized cooperation. The device does not need large-scale transformation of existing equipment of a power station, is low in single-station transformation cost, is rapid in installation, can effectively solve the problems that most of existing stock power station grid-connected point switches are conventional switch equipment without a remote control function, and the fault processing time is long, meets the power dispatching safety requirement, is plug-and-play, is suitable for various stock power stations, and is wide in application prospect.

Description

Technical Field

[0001] This invention relates to the field of power grid switch control technology, and in particular to a grid connection point switch control and data uploading device and a method for dispatching existing power plants. Background Technology

[0002] Distributed energy resources are favored due to their advantages such as efficient energy utilization, low loss, low pollution, flexible operation, and good system economy. With the large-scale application of distributed power sources, the proportion of small-scale distributed energy resources with randomness, fluctuation, and intermittency in my country's power grid will increase significantly in the future, and they may even become an indispensable part of the power grid. The connection of a large number of small-scale distributed generation units to the distribution network results in a large number of grid connection point switches that are widely distributed. These grid connection point switches, as key components connecting small-scale distributed power sources to the distribution network, directly affect the efficiency of distributed energy absorption and grid security through their connection, commissioning, and operation and maintenance. When a fault occurs at the dispatching station (such as overvoltage, overcurrent, or islanding effect) or when the dispatching station issues a power outage or maintenance order, the connection between the power station and the grid must be disconnected to prevent the fault from spreading and to ensure the safety of grid operation and maintenance personnel and equipment. In this case, the grid connection point switches should quickly trip. Under normal conditions, the grid connection point switches should close to transmit electrical energy to the public grid.

[0003] However, the grid connection point switches of existing power plants are mostly located in the high-voltage room switchgear, where the internal structure is compact and the reserved installation space is limited. Existing smart switches have fixed dimensions and installation interface requirements, making it difficult to adapt to the limited space and original layout of the switchgear. Therefore, most of the grid connection point switches in existing power plants are conventional switchgear without remote control functions. When a fault occurs, these switches can only be operated manually on-site (such as manually flipping the switch or pressing the control button). The overall fault handling is time-consuming, inefficient, and prone to errors. Configuration errors can also occur due to differences in operation, resulting in the switch being unable to respond normally to dispatch commands after connection, making it difficult to respond to power restoration needs in a timely manner. This adversely affects the reliable operation of the power grid and the user's power experience. Therefore, how to achieve efficient connection and plug-and-play functionality of the grid connection point switches has become an urgent problem to be solved. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of existing power plant grid connection point switches, which are mostly conventional switching equipment without remote control function, resulting in long fault handling time and difficulty in responding to power restoration needs in a timely manner.

[0005] To solve the above-mentioned technical problems, the present invention provides a grid connection point switch control and data uploading device, comprising: The communication module is connected to the dispatch terminal of the existing power station and is used to receive remote control commands issued by the dispatch terminal. The FTU main module is connected to the communication module to receive remote control commands output by the communication module and convert them into opening and closing drive commands. The signal conversion module includes: The intermediate relay is connected to the FTU main module and is used to receive the opening and closing drive commands issued by the FTU main module. It converts the voltage level of the opening and closing drive commands through coil operation so that the voltage level of the converted opening and closing drive commands is consistent with the power supply voltage of the grid connection point switch operating mechanism. The voltage and current transmitters connect to the voltage transformers, current transformers, and FTU main modules of the existing power station. They convert the AC voltage signal received from the voltage transformers into a DC voltage signal within the voltage acquisition range of the FTU main module, and convert the AC current signal received from the current transformers into a DC current signal within the current acquisition range of the FTU main module. The DC voltage and current signals are then sent to the FTU main module, which receives them and transmits them to the dispatch terminal of the existing power station via a communication module. The control execution module is connected to the intermediate relay, the grid connection point switch operating mechanism, and the FTU main module. It is used to receive the converted opening and closing drive commands output by the intermediate relay and drive the grid connection point switch operating mechanism to complete the opening and closing actions. After the opening and closing actions are completed, it collects the open, closed, and remote control position status of the grid connection point switch and sends it to the FTU main module. After receiving it, the FTU main module transmits it to the dispatch terminal of the existing power plant through the communication module. The power adapter module supplies power to the communication module, FTU main module, signal conversion module, and control execution module.

[0006] Preferably, the control execution module, through the status acquisition unit, acquires the open, closed, and remote control position status of the grid connection point switch after the opening and closing actions are completed and sends it to the FTU main module; wherein, the status acquisition unit acquires the switch auxiliary contact signal of the grid connection point switch operating mechanism through an opto-isolation circuit, converts the analog on / off signal of the auxiliary contact into a digital signal, and obtains the open, closed, and remote control position status of the grid connection point switch.

[0007] Preferably, the intermediate relay has a coil rated voltage of DC24V and contact rated parameters of AC220V / 12A.

[0008] Preferably, the contact circuit of the intermediate relay is equipped with an arc-breaking protection structure.

[0009] Preferably, the input range of the voltage and current transmitter includes 100V AC voltage and 5A AC current, and the output range is 0 to 3.25V DC voltage and 0 to 1A DC current.

[0010] Preferably, the FTU main module is connected to the signal conversion module and the control execution module via a 26-pin aviation socket.

[0011] Preferably, the input terminal of the power adapter module is connected to the mains power supply of the secondary compartment of the switchgear at the grid connection point of the existing power station. After the 220V mains power is converted to 24V DC voltage through the AC / DC power adapter, it supplies power to the FTU main module, signal conversion module and control execution module.

[0012] Preferably, the communication module is a 5G communication module.

[0013] Preferably, the communication module further includes: The hardware encryption unit is used to encrypt the remote control commands issued by the dispatch terminal before sending them to the FTU main module; and to encrypt the DC voltage signal, DC current signal, grid connection point switch open / closed position and remote control position status output by the FTU main module before sending them to the dispatch terminal.

[0014] The present invention also provides a method for scheduling existing power plants based on the above-mentioned grid connection point switch control and data upload device, comprising: By using grid connection point switch control and data upload devices, existing power plants are integrated into the dispatching system of the dispatching terminal, thus constructing a unified dispatching and management system for existing power plants. The unified dispatch and management system for the existing power plants includes: The AC voltage signal output by the voltage transformer and the AC current signal output by the current transformer of the existing power station are collected in real time through the grid connection point switch control and data upload device. After being converted into DC voltage signal and DC current signal that conform to the acquisition range of the FTU main module by the voltage and current transmitter, they are uploaded to the dispatch terminal. When the dispatch terminal detects a fault in the existing power station through the collected DC voltage signal and DC current signal, the dispatch terminal sends a tripping remote control command to the grid connection point switch control and data upload device. Based on the tripping remote control command, the grid connection point switch control and data upload device drives the grid connection point switch operating mechanism to complete the tripping action and disconnect the existing power station from the distribution network. When the dispatch terminal detects that the existing power station has returned to normal through the collected DC voltage and DC current signals, the dispatch terminal sends a closing remote control command to the grid connection point switch control and data upload device. Based on the closing remote control command, the grid connection point switch control and data upload device drives the grid connection point switch operating mechanism to complete the closing action, restoring the power transmission from the existing power station to the distribution network.

[0015] Compared with the prior art, the above-described technical solution of the present invention has the following advantages: This invention discloses a grid-connected point switch control and data upload device and a method for dispatching existing power plants. The invention considers that the FTU main module, capable of receiving remote control commands from the dispatching terminal and converting them into opening and closing drive commands, is the core component for realizing switch remote control. However, directly integrating the FTU main module faces technical bottlenecks such as operating power supply mismatch (FTU output DC24V is incompatible with switch operating power supplies DC110V / DC220V) and poor electrical quantity acquisition adaptability (conventional PT / CT output does not match the FTU acquisition range), making it difficult to meet the dispatching terminal's control requirements for safe access and reliable operation of power plants. Therefore, this invention sets up a signal conversion module, using an intermediate relay to complete voltage level conversion to adapt to the switch operating power supply, and uses a voltage and current transmitter to convert the conventional PT / CT output signal into a standard signal within the FTU acquisition range. Simultaneously, with the coordinated work of the communication module, control execution module, and power adaptation module, this invention focuses on the plug-and-play technology of grid-connected point switch control equipment. By integrating the grid-connected point switch control and data upload device proposed in this invention, the plug-and-play function of the equipment is successfully realized. To verify the technical feasibility, this invention established a laboratory testing environment and completed interoperability integration tests between edge devices and end devices, and between end devices. Test results show that conventional switchgear without remote control functionality, by incorporating the grid connection point switch control and data upload device of this invention, can achieve remote dispatching of existing power plants from the dispatching terminal. This effectively solves the problems of limited space in switchgear cabinets of existing power plants and the difficulty in adapting existing intelligent switches, realizing remote control transformation and status monitoring of conventional switches, and ensuring reliable control of the power plant from the dispatching terminal. Attached Figure Description

[0016] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0017] Figure 1 This is a data transmission diagram of a grid connection point switch control and data upload device according to the present invention.

[0018] Figure 2 This is a structural diagram of a grid connection point switch control and data upload device according to the present invention. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0020] Reference Figure 1 , Figure 2 As shown, this embodiment provides a grid connection point switch control and data uploading device, including: The communication module is connected to the dispatch terminal of the existing power station and is used to receive remote control commands issued by the dispatch terminal. In this embodiment, preferably, the communication module is a 5G communication module.

[0021] In this embodiment, preferably, the communication module further includes: The hardware encryption unit is used to encrypt the remote control commands issued by the dispatch terminal before sending them to the FTU main module; and to encrypt the DC voltage signal, DC current signal, grid connection point switch open / closed position and remote control position status output by the FTU main module before sending them to the dispatch terminal.

[0022] The communication module integrates a multi-network 5G communication unit and a hardware encryption unit, supporting access from multiple networks including China Mobile, China Telecom, and China Unicom, thus solving the problem of unstable signals in remote areas. The hardware encryption unit complies with the standards of the State Cryptography Administration and the security requirements of the State Grid power distribution automation, ensuring encrypted protection during data transmission without the need for additional security equipment.

[0023] The FTU main module is connected to the communication module to receive remote control commands output by the communication module and convert them into opening and closing drive commands. The FTU main module serves as the core of the device, undertaking command parsing, data processing, and logic control functions. Utilizing an industrial-grade FTU hardware platform, it supports multi-channel signal input and output, possesses strong anti-interference capabilities and stability, and can adapt to the control needs of different types of distributed photovoltaic power plants.

[0024] In this embodiment, preferably, the FTU main module is connected to the signal conversion module and the control execution module via a 26-pin aviation socket. The 26-pin aviation socket includes a current sampling channel, a voltage sampling channel, a circuit breaker control channel, an energy storage control channel, and a status feedback channel.

[0025] The communication port of the FTU main module is connected to the communication module, which communicates with the dispatch terminal I main station via the 5G network; the status output terminal of the control execution module is connected to the status input terminal of the FTU main module to form a closed-loop control.

[0026] The signal conversion module includes: The intermediate relay is connected to the FTU main module and is used to receive the opening and closing drive commands issued by the FTU main module. It converts the voltage level of the opening and closing drive commands through coil operation so that the voltage level of the converted opening and closing drive commands is consistent with the power supply voltage of the grid connection point switch operating mechanism. In this embodiment, specifically, the rated coil voltage of the intermediate relay is DC24V and the rated contact parameters are AC220V / 12A.

[0027] In this embodiment, preferably, the contact circuit of the intermediate relay is provided with an arc-breaking protection structure.

[0028] The intermediate relay is selected with a coil rated voltage of DC24V and contact parameters of AC220V / 12A to achieve compatibility between the DC24V control signal of the FTU main module and the DC110V / DC220V operating power supply of the switch. At the same time, the arc-breaking design of the contact prevents arc erosion when the switch mechanism is stuck.

[0029] The voltage and current transmitters connect to the voltage transformers, current transformers, and FTU main modules of the existing power station. They convert the AC voltage signal received from the voltage transformers into a DC voltage signal within the voltage acquisition range of the FTU main module, and convert the AC current signal received from the current transformers into a DC current signal within the current acquisition range of the FTU main module. The DC voltage and current signals are then sent to the FTU main module, which receives them and transmits them to the dispatch terminal of the existing power station via a communication module. In this embodiment, specifically, the input range of the voltage and current transmitter includes 100V AC voltage and 5A AC current, and the output range is 0 to 3.25V DC voltage and 0 to 1A DC current.

[0030] The voltage and current transmitter is a customized design that converts the AC100V voltage signal output by the voltage transformer PT and the 5A current signal output by the current transformer CT of the existing power station into DC 0-3.25V voltage signal and 0-1V current signal that can be recognized by the FTU main module. It supports hot-swapping for easy installation and maintenance. The control execution module is connected to the intermediate relay, the grid connection point switch operating mechanism, and the FTU main module. It is used to receive the converted opening and closing drive commands output by the intermediate relay and drive the grid connection point switch operating mechanism to complete the opening and closing actions. After the opening and closing actions are completed, it collects the open, closed, and remote control position status of the grid connection point switch and sends it to the FTU main module. After receiving it, the FTU main module transmits it to the dispatch terminal of the existing power plant through the communication module. In this embodiment, preferably, the control execution module, through the status acquisition unit, acquires the open, closed, and remote control position status of the grid connection point switch after the opening and closing action is completed and sends it to the FTU main module; wherein, the status acquisition unit acquires the switch auxiliary contact signal of the grid connection point switch operating mechanism through the opto-isolation circuit, converts the analog on / off signal of the auxiliary contact into a digital signal, and obtains the open, closed, and remote control position status of the grid connection point switch.

[0031] The control execution module is connected to the grid connection point switch operating mechanism, receives the opening and closing commands from the FTU main module and drives the switch to operate; at the same time, it collects the switch opening, closing and remote control position status signals through the opto-isolation circuit, processes them and feeds them back to the FTU main module, with a collection period of no more than 100ms to ensure the real-time status feedback.

[0032] The power adapter module supplies power to the communication module, FTU main module, signal conversion module, and control execution module.

[0033] In this embodiment, specifically, the input terminal of the power adapter module is connected to the mains power supply of the secondary compartment of the switch cabinet at the grid connection point of the existing power station. After the 220V mains power is converted to 24V DC voltage through the AC / DC power adapter, it supplies power to the communication module, FTU main module, signal conversion module and control execution module.

[0034] The power adapter module's input terminal connects to the existing 220V power supply in the secondary compartment of the switchgear, converting it to a stable DC 24V output via an AC / DC power adapter. The output terminal of the power adapter module connects to the power input terminals of the FTU main module, signal conversion module, control execution module, and communication module, respectively, providing power to these modules. This module features overvoltage, overcurrent, and short-circuit protection, and its input voltage is compatible with AC 220V ± 10% fluctuations, ensuring stable operation of the device in complex power environments.

[0035] When the device of the present invention is in operation, it follows these steps: Device initialization: The power adapter module converts the 220V power supply of the secondary compartment of the switchgear to DC24V working voltage to power each module; after the FTU main module starts up, it establishes a connection with the dispatch terminal I zone master station through the communication module to complete identity authentication and parameter configuration.

[0036] Data acquisition: The voltage and current transmitters acquire the voltage signal output by the PT and the current signal output by the CT in real time, convert them into standard DC signals and transmit them to the FTU main module; the control execution module acquires the opening and closing status and remote control position status of the grid connection point switch through the opto-isolation circuit and feeds it back to the FTU main module.

[0037] Data Upload: The FTU main module filters and calibrates the collected electrical quantity data such as voltage, current, and power, as well as switch status data. After packaging the data according to the dispatcher protocol format, it is encrypted and uploaded to the dispatcher's Zone I main station through the communication module. The upload period is configurable (default 1 second).

[0038] Command reception and execution: The FTU main module receives the opening and closing remote control commands issued by the dispatch terminal, performs command verification (including permission verification and logic verification), and outputs a DC24V control signal to the intermediate relay after the verification is passed. The intermediate relay then activates and drives the switch operating mechanism to complete the opening and closing operation.

[0039] Status feedback: After the switching action is completed, the control execution module collects the updated switching status in real time and feeds it back to the FTU main module. The FTU main module uploads the status change information to the dispatch terminal, completing one control cycle. If the switching action fails, the FTU main module immediately generates an alarm signal and uploads it to prompt the dispatch terminal to troubleshoot the fault.

[0040] In this embodiment, the main FTU module uses the State Grid standard distribution automation FTU equipment, which has 8 analog inputs, 16 digital inputs, and 8 relay outputs; the power adapter module uses an AC220V to DC24V / 5A power adapter, model Mean Well RS-100-24; the voltage and current transmitter is a customized model, with AC100V / 5A input and DC0-3.25V / 0-1V output, supporting hot-swapping; the intermediate relay uses a DC24V coil model with contact parameters of AC220V / 12A; the communication module uses a Huawei ME909s-821 5G module, which supports multi-network access and integrates the SM4 encryption algorithm; the status acquisition unit of the control execution module uses an optocoupler TLP521-4 to achieve isolated acquisition of switch status signals.

[0041] During on-site installation, the FTU main module, power adapter, intermediate relay, and voltage / current transmitter are installed in the secondary compartment of the 10KV incoming cabinet (model SVD-12) of the photovoltaic power station. The FTU main module is fixed to the side of the secondary compartment with two self-tapping screws. The power adapter is connected to the existing 220V power supply in the secondary compartment, and outputs DC24V to power each module. The input terminals of the voltage / current transmitters are connected to the PT (output AC100V) and CT (output 5A), and the output terminals are connected to the analog input channel of the FTU main module through a 26-pin aviation socket. The input terminal of the intermediate relay is connected to the relay output channel of the FTU main module, and the output terminal is connected to the switch operating mechanism coil. The communication module is connected to the FTU main module through an RS485 interface, and a 5G SIM card is inserted to achieve communication with the main station of Zone I of the dispatch terminal. The status acquisition unit of the control execution module is connected to the auxiliary contact of the switch through the terminal block, and the output terminal is connected to the switch input channel of the FTU main module.

[0042] After installation and commissioning, functional tests were conducted: When the dispatch terminal issued a tripping command, the FTU main module received the command and drove the intermediate relay to operate, successfully tripping the switch. The dispatch terminal displayed the switch tripping status in real time, and electrical data (voltage, current, power) were uploaded normally. After issuing a closing command, the switch successfully closed, and the status feedback was accurate with no delay. A continuous 72-hour stability test showed that the device received signals normally, with no disconnections, the remote control operation accuracy was 100%, and the data upload error was less than ±0.5%, meeting the requirements of the power grid dispatch terminal.

[0043] This invention solves the problem of power supply and signal compatibility. It achieves compatibility between the FTU DC24V control signal and the switch DC110V / DC220V operating power supply through an intermediate relay, and solves the incompatibility problem between conventional PT / CT output and FTU acquisition range through a customized transmitter, thus realizing controllable and observable functions.

[0044] This invention employs a multi-network 5G communication module, compatible with China Mobile, China Telecom, and China Unicom networks, to solve the problem of unstable signals in remote areas; it integrates a hardware encryption unit to meet national network security standards and ensure data transmission security.

[0045] This invention has low modification cost and convenient installation, with a single station modification cost of only about RMB 20,000. The device is installed in the secondary compartment of the photovoltaic incoming switch cabinet, without the need for slotting or drilling. Only two self-tapping screws are needed for fixing, and the number of on-site wiring terminals does not exceed 18. Installation and commissioning can be completed in 2 hours.

[0046] This invention is highly adaptable and widely applicable, featuring plug-and-play functionality. It can be adapted to all grid-connected switches equipped with electric operating mechanisms. If the power distribution room is equipped with PT and CT equipment, it can achieve complete measurement, control, and protection functions. It is suitable for the renovation of existing self-consumption photovoltaic power stations with surplus grid connection, and can also be used as a standard configuration for newly built power stations.

[0047] The present invention also provides a method for scheduling existing power plants based on the above-mentioned grid connection point switch control and data upload device, comprising: By using grid connection point switch control and data upload devices, existing power plants are integrated into the dispatching system of the dispatching terminal, thus constructing a unified dispatching and management system for existing power plants. The unified dispatch and management system for the existing power plants includes: The AC voltage signal output by the voltage transformer and the AC current signal output by the current transformer of the existing power station are collected in real time through the grid connection point switch control and data upload device. After being converted into DC voltage signal and DC current signal that conform to the acquisition range of the FTU main module by the voltage and current transmitter, they are uploaded to the dispatch terminal. When the dispatch terminal detects a fault in the existing power station through the collected DC voltage signal and DC current signal, the dispatch terminal sends a tripping remote control command to the grid connection point switch control and data upload device. Based on the tripping remote control command, the grid connection point switch control and data upload device drives the grid connection point switch operating mechanism to complete the tripping action and disconnect the existing power station from the distribution network. When the dispatching terminal detects that the existing power station has returned to normal through the collected DC voltage and DC current signals, the dispatching terminal sends a closing remote control command to the grid connection point switch control and data upload device. Based on the closing remote control command, the grid connection point switch control and data upload device drives the grid connection point switch operating mechanism to complete the closing action, restoring the power transmission from the existing power station to the distribution network. Those skilled in the art should understand that the embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0048] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0049] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0050] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0051] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A grid connection point switch control and data uploading device, characterized in that, include: The communication module is connected to the dispatch terminal of the existing power station and is used to receive remote control commands issued by the dispatch terminal. The FTU main module is connected to the communication module to receive remote control commands output by the communication module and convert them into opening and closing drive commands. The signal conversion module includes: The intermediate relay is connected to the FTU main module and is used to receive the opening and closing drive commands issued by the FTU main module. It converts the voltage level of the opening and closing drive commands through coil operation so that the voltage level of the converted opening and closing drive commands is consistent with the power supply voltage of the grid connection point switch operating mechanism. The voltage and current transmitters connect to the voltage transformers, current transformers, and FTU main modules of the existing power station. They convert the AC voltage signal received from the voltage transformers into a DC voltage signal within the voltage acquisition range of the FTU main module, and convert the AC current signal received from the current transformers into a DC current signal within the current acquisition range of the FTU main module. The DC voltage and current signals are then sent to the FTU main module, which receives them and transmits them to the dispatch terminal of the existing power station via a communication module. The control execution module is connected to the intermediate relay, the grid connection point switch operating mechanism, and the FTU main module. It is used to receive the converted opening and closing drive commands output by the intermediate relay and drive the grid connection point switch operating mechanism to complete the opening and closing actions. After the opening and closing actions are completed, it collects the open, closed, and remote control position status of the grid connection point switch and sends it to the FTU main module. After receiving it, the FTU main module transmits it to the dispatch terminal of the existing power plant through the communication module. The power adapter module supplies power to the communication module, FTU main module, signal conversion module, and control execution module.

2. The grid connection point switch control and data upload device according to claim 1, characterized in that, After the opening and closing actions are completed, the control execution module collects the open, closed, and remote control position status of the grid connection point switch through the status acquisition unit and sends it to the FTU main module. The status acquisition unit collects the switch auxiliary contact signals of the grid connection point switch operating mechanism through an opto-isolation circuit, converts the analog on / off signals of the auxiliary contacts into digital signals, and obtains the open, closed, and remote control position status of the grid connection point switch.

3. The grid connection point switch control and data upload device according to claim 1, characterized in that, The intermediate relay has a coil rated voltage of DC24V and contact rated parameters of AC220V / 12A.

4. The grid connection point switch control and data upload device according to claim 1, characterized in that, The contact circuit of the intermediate relay is equipped with an arc-breaking protection structure.

5. The grid connection point switch control and data upload device according to claim 1, characterized in that, The input range of the voltage and current transmitter includes 100V AC voltage and 5A AC current, and the output range is 0 to 3.25V DC voltage and 0 to 1A DC current.

6. The grid connection point switch control and data upload device according to claim 1, characterized in that, The FTU main module is connected to the signal conversion module and control execution module via a 26-pin aviation socket.

7. The grid connection point switch control and data upload device according to claim 1, characterized in that, The input terminal of the power adapter module is connected to the mains power supply of the secondary compartment of the switchgear at the grid connection point of the existing power station. After converting the 220V mains power to 24V DC voltage through the AC / DC power adapter, it supplies power to the FTU main module, signal conversion module and control execution module.

8. The grid connection point switch control and data upload device according to claim 1, characterized in that, The communication module is a 5G communication module.

9. The grid connection point switch control and data upload device according to claim 1, characterized in that, The communication module also includes: The hardware encryption unit is used to encrypt the remote control commands issued by the dispatch terminal before sending them to the FTU main module; and to encrypt the DC voltage signal, DC current signal, grid connection point switch open / closed position and remote control position status output by the FTU main module before sending them to the dispatch terminal.

10. A method for scheduling existing power plants based on the grid connection point switch control and data upload device according to any one of claims 1-9, characterized in that, include: By using grid connection point switch control and data upload devices, existing power plants are integrated into the dispatching system of the dispatching terminal, thus constructing a unified dispatching and management system for existing power plants. The unified dispatch and management system for the existing power plants includes: The AC voltage signal output by the voltage transformer and the AC current signal output by the current transformer of the existing power station are collected in real time through the grid connection point switch control and data upload device. After being converted into DC voltage signal and DC current signal that conform to the acquisition range of the FTU main module by the voltage and current transmitter, they are uploaded to the dispatch terminal. When the dispatch terminal detects a fault in the existing power station through the collected DC voltage signal and DC current signal, the dispatch terminal sends a tripping remote control command to the grid connection point switch control and data upload device. Based on the tripping remote control command, the grid connection point switch control and data upload device drives the grid connection point switch operating mechanism to complete the tripping action and disconnect the existing power station from the distribution network. When the dispatch terminal detects that the existing power station has returned to normal through the collected DC voltage and DC current signals, the dispatch terminal sends a closing remote control command to the grid connection point switch control and data upload device. Based on the closing remote control command, the grid connection point switch control and data upload device drives the grid connection point switch operating mechanism to complete the closing action, restoring the power transmission from the existing power station to the distribution network.

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