Emergency power supply recovery method based on transformer area intelligent fusion terminal

Abstract

The invention provides an emergency power supply recovery method based on a transformer area intelligent fusion terminal. The method comprises the following steps: establishing a transformer area emergency power supply recovery system; establishing a micro-application framework based on a transformer area intelligent fusion terminal, wherein the micro-application framework comprises a universal source network load storage access APP and a source network load storage collaborative emergency recovery APP; the universal source network load storage access APP is based on a unified communication protocol framework, and adopts a configurable physical model and an extensible communication protocol plug-in technology to realize unified access of various terminal devices; the source network load storage cooperative emergency recovery APP is based on area intelligent fusion terminal edge calculation, adopts an automatic switching control strategy, realizes grid-connected and off-grid rapid switching and cooperation between the source load storage in a power distribution area under different emergency conditions, and guarantees reliable power supply of a key load to the greatest extent. By coordinating the power supply side, the network side, the load side and the energy storage side in the power distribution network, the power supply reliability of the important load is greatly improved, and the power loss recovery time of the superior power supply is shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply of distribution network, and in particular relates to an emergency power supply restoration method. Background Art

[0002] Low-voltage distribution station users are of many types, large in number, and have diverse demands. Once a power outage occurs, it will not only directly affect users' daily life and production, but may also cause more serious power accidents. Since power outages are more harmful and affect a wider range, power supply companies attach great importance to emergency power supply restoration. In the event of a power grid accident or short-term maintenance, fixed substation energy storage power stations or mobile energy storage power supply vehicles can be used to provide emergency power supply to ensure continuous power supply to power users.

[0003] Under the background of dual carbon, the boundaries between source, grid and load in microgrids tend to be blurred, the interactions are more frequent and the characteristics are more complex. However, in the event of natural disasters, accidents, emergencies, etc., when the upper-level power grid fails or power outages occur, emerging source, load and storage elements such as distributed power sources, charging piles, and energy storage can provide emergency support for power supply to the substation. The inventors have found through research that the existing emergency power supply restoration system is supported by a separate emergency vehicle or energy storage system, which is unable to sense power outages in the distribution transformer in time and provide active support in combination with the power load of the substation. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the existing emergency power supply restoration system, which is supported by a single emergency vehicle or energy storage system, cannot timely sense the power outage of the distribution transformer and actively support it in combination with the power load of the substation, and has no unified access system. An emergency power supply restoration method based on the substation intelligent fusion terminal is provided to achieve that when the upper power grid fails or the power outage occurs, the substation energy storage is connected to the grid and turned off the grid. When the distribution transformer resumes power supply, the energy storage is turned off the grid and turned on the grid.

[0005] The technical solution adopted by the present invention is: an emergency power supply restoration method based on an intelligent fusion terminal in an area, characterized in that it includes: Establishment of emergency power supply restoration system in substations; Establish a micro-application framework based on the intelligent fusion terminal in the substation area, including a general source-grid-load-storage access APP and a source-grid-load-storage collaborative emergency recovery APP; The universal source-grid-load-storage access APP is based on a unified communication protocol framework, adopts a configurable object model and scalable communication protocol plug-in technology, and realizes unified access to various terminal devices; The source-grid-load-storage collaborative emergency recovery APP is based on the edge computing of the intelligent fusion terminal in the substation area and adopts an automated switching control strategy to achieve rapid switching and coordination between sources, loads and storage in the distribution station area under different emergency situations, thereby maximizing the reliable power supply of critical loads.

[0006] The emergency power supply restoration system has a three-layer architecture of cloud-edge-end, where the cloud includes the distribution cloud master station and the property management platform, the edge includes the substation intelligent fusion terminal, and the end includes the substation source, grid, load and storage distributed resources (low-voltage switches, grid-type energy storage systems, photovoltaics, charging piles and user loads).

[0007] The emergency power supply restoration system includes a distribution cabinet, an intelligent fusion terminal in the substation area, a grid cabinet, and an energy storage system in the substation area; The power distribution cabinet includes a low-voltage main switch and multiple outgoing line switches. The incoming line end of the low-voltage main switch is connected to the distribution transformer. The low-voltage main switch is connected to multiple outgoing line switches through the low-voltage busbar. The outgoing line side of one of the outgoing line switches is connected to the grid-connected cabinet. The intelligent fusion terminal of the substation is connected to the low voltage main outgoing line side; The grid-connected cabinet comprises a low-voltage power switch and a three-phase meter. The power switch inlet of the grid-connected cabinet is connected to an outlet switch of the power distribution cabinet, and the outlet of the power switch is connected to the energy storage system of the station area. The substation energy storage system includes a PCS, a BMS and a battery system.

[0008] The substation energy storage system uses RS485 to communicate with the substation intelligent fusion terminal, accepts the regulation of the substation intelligent fusion terminal, and realizes the grid-connected and off-grid control of the grid-connected energy storage system based on the micro-application in the substation intelligent fusion terminal; The low-voltage main switch uses RS485 to communicate with the intelligent fusion terminal in the substation area, and accepts the regulation of the intelligent fusion terminal in the substation area, which can realize the rigid control of the grid connection and disconnection of the distribution transformer in the substation area; The substation intelligent fusion terminal communicates with the distribution cloud master station and the property management platform through 4G / 5G communication, and uploads data to the distribution cloud master station; on the distribution cloud master station platform side, the master station can remotely monitor the on-site low-voltage switches and energy storage systems.

[0009] The substation intelligent fusion terminal communicates with the equipment through the serial port or network port, collects the remote signaling, telemetry, and fixed parameter data of the equipment in real time, and can receive the remote control and remote adjustment of the remote control equipment of the distribution cloud master station; the collected terminal devices include low-voltage intelligent switches and energy storage devices, and the supported communication protocols include serial port DLT645 protocol, serial port Modbus protocol, network ModbusTCP protocol and network IEC104 protocol. The protocol is extensible and supports parallel collection of terminal devices with multiple different protocols, so as to realize unified access control of source, grid, load and storage equipment.

[0010] The universal source-grid-load-storage access APP framework is divided into four layers: communication conversion layer, protocol conversion layer, data cache layer, and application layer; the communication conversion layer manages various types of channels of the terminal; the protocol conversion layer realizes the conversion of the acquisition protocols of each end device, and is expanded based on the extensible protocol plug-in library; the data cache layer establishes a classified data cache area according to the physical model requirements of the distribution data center, including telemetry, telesignaling, parameters, remote control, and remote adjustment data, and realizes the two-way data synchronization function of the data center; the application layer triggers the execution of distribution equipment reading at a regular interval according to the acquisition tasks and acquisition plans configured by the acquisition framework, and subscribes to the remote control and remote adjustment commands, converts them into protocol commands, and issues the commands.

[0011] The automatic switching control strategy includes a grid-connected to off-grid strategy and an off-grid to grid-connected strategy; The grid-connected to off-grid strategy has the following process: Step 1: The 10KV high-voltage side of the distribution transformer is out of power, and the intelligent fusion terminal in the substation detects the "power outage" event; Step 2: The intelligent fusion terminal in the substation area determines that the upper level cannot restore power supply and disconnects the low-voltage main switch of the power distribution cabinet; Step 3: The intelligent fusion terminal in the substation calculates whether the load of the substation's low-voltage main switch and outgoing branch lines meets the requirements of the energy storage system's support capacity; Step 4: If the energy storage capacity cannot support the current load in the substation, the load switch that can be removed is determined based on the priority and capacity of the low-voltage outgoing line load and the maximum matching method between the combined load capacity of the outgoing line switch before the power outage and the energy storage capacity, and the low-voltage outgoing line switch is controlled to disconnect; Step 5: Control the energy storage to switch to "off-grid" mode and then start the machine; Step 6: Control the energy storage to switch to the "voltage source" mode, and the black start of the substation is completed.

[0012] The calculation of whether the total open and outgoing branch loads of the substation area meet the energy storage support capacity requirements is specifically: judging whether the energy storage capacity × support coefficient is greater than the current total load capacity of the substation area.

[0013] The off-grid to grid-connected strategy has the following process: Step 1: The power supply of the upper-level low-voltage main switch of the power distribution cabinet is restored, and the fusion terminal senses the "power restoration" event; Step 2: Control the low-voltage main switch of the power distribution cabinet to close and enter the grid-connected mode; Step 3: Control energy storage shutdown; Step 4: Control the load outgoing line switches that have been cut off to close in sequence; Step 5: To reduce load shock, check the load rate of the distribution transformer in the substation. If charging the energy storage will not cause a heavy overload in the substation, control the energy storage to enter the grid-connected mode, control the energy storage to charge steadily and gradually increase the power to reduce the impact on the power grid and energy storage.

[0014] The present invention is based on the promotion and application scenario of intelligent fusion terminal devices in substations. By combining a grid-type energy storage system, an emergency power supply recovery system is constructed. Based on the micro-application APP framework, an emergency power supply and off-grid strategy method is implemented, which is beneficial to improving the resilience of the power supply and power protection system in the substation, and enhancing the distribution network's ability to resist various faults and natural disasters. Based on backup power supplies and distributed resource management, the substation has stronger recovery and self-repair capabilities.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the emergency power supply restoration method based on the intelligent fusion terminal of the substation provided by the present invention greatly improves the power supply reliability of important loads and shortens the power failure recovery time of the upper power supply by coordinating the power side, network side, load side and energy storage side in the distribution network. The energy storage system can be put into use immediately within a short time after the fault occurs to maintain short-term power supply to critical loads. Distributed power sources can be quickly connected to the grid, shortening the power supply restoration time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the overall architecture diagram of the emergency power supply restoration system in the substation area; Figure 2 This is a typical application scenario diagram of emergency power supply restoration in the substation area; Figure 3 This is a micro-application architecture diagram based on the intelligent fusion terminal of the station area; Figure 4 This is the framework diagram of the universal source-grid-load-storage access APP; Figure 5 It is a strategy diagram for switching from grid-connected to off-grid; Figure 6 It is the timing diagram of grid-connected to off-grid; Figure 7 It is the off-grid to grid-connected strategy diagram; Figure 8 This is the timing diagram of off-grid to grid-connected. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without carrying out creative work are within the scope of protection of the present invention.

[0018] Technologies, methods, and apparatus known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and apparatus should be considered part of the authorization specification.

[0019] The emergency power supply restoration method based on the intelligent fusion terminal in the substation area provided by the present invention is based on the edge computing of the intelligent fusion terminal in the substation area, in the form of software APP, to realize the unified access of source-grid-load-storage-end equipment, the energy storage emergency power supply connection and off-grid, and off-grid and grid-connected strategies, and improve the power supply reliability of the substation area. The method includes: 1) Establish an emergency power supply restoration system in the substation area; 2) Establish a micro-application APP framework based on the intelligent fusion terminal of the substation area to achieve unified access to various source, grid, load and storage equipment in the substation area, as well as automatic switching of energy storage on and off the grid.

[0020] The established substation emergency power supply restoration system includes distribution cabinets, substation intelligent fusion terminals, grid cabinets, and substation energy storage systems. The distribution cabinet contains a low-voltage main switch and multiple outgoing line switches. The incoming line of the low-voltage main switch is connected to the distribution transformer. The low-voltage main switch is connected to multiple outgoing line switches through the low-voltage busbar, and the outgoing side of one of the outgoing line switches is connected to the grid cabinet; the substation intelligent fusion terminal is connected to the outgoing side of the low-voltage main switch; the grid cabinet contains a low-voltage power switch and a three-phase meter. The incoming line of the power switch of the grid cabinet is connected to an outgoing line switch of the distribution cabinet, and the outgoing line of the power switch is connected to the substation energy storage system; the substation energy storage system includes PCS, BMS and battery system.

[0021] The emergency power supply restoration system architecture based on the intelligent fusion terminal of the substation area provided by the present invention is as follows: Figure 1 As shown in the figure, the overall architecture is divided into three layers: cloud-edge-end: "cloud" mainly includes the power distribution cloud master station and the property management platform, which realizes the data display, monitoring and flexible adjustment of various devices at the edge and end. "Edge" is mainly based on the intelligent fusion terminal of the substation. The fusion terminal is the core equipment of the "edge" side of the power Internet of Things. It has the functions of equipment management, collection and communication, collaborative computing, intelligent analysis and decision-making control. It can realize flexible functional expansion in a software-defined way, support marketing, power distribution and emerging businesses, and realize the unified access of various types of resources such as source, grid, load and storage, and the rapid on-grid and off-grid conversion fault recovery of the power supply in the distribution area based on the micro-application of the emergency power supply recovery system. "End" mainly includes low-voltage switches, grid-type energy storage, photovoltaics, charging piles and user loads distributed under the substation.

[0022] like Figure 2The figure shows a typical application scenario of emergency power supply restoration in the substation, in which the substation energy storage system uses RS485 to communicate with the substation intelligent fusion terminal, accepts the regulation of the substation intelligent fusion terminal, and realizes the on-grid and off-grid control of the grid-connected energy storage based on micro-applications; the low-voltage intelligent main switch uses RS485 to communicate with the substation intelligent fusion terminal, receives the regulation of the substation intelligent fusion terminal, and can realize the on-grid and off-grid rigid control of the substation distribution transformer; the substation intelligent fusion terminal communicates with the distribution cloud master station and the property management platform through 4G / 5G communication, and uploads the data to the IoT cloud master station; on the distribution cloud master station platform side, the master station can remotely monitor the on-site low-voltage switches and energy storage.

[0023] Micro-application framework based on intelligent fusion terminal in the substation area Figure 3 As shown, it includes a universal source-grid-load-storage access APP and a source-grid-load-storage collaborative emergency recovery APP. The universal source-grid-load-storage access APP is mainly used to solve the data collection, calculation and control problems of various heterogeneous terminal devices such as photovoltaics, energy storage, charging piles and low-voltage intelligent switches. The traditional solution is to run a micro-application for each type of terminal device. This method leads to too many micro-applications collected by the fusion terminal, too many configurations, and inconvenient management. The present invention is based on the universal source-grid-load-storage device access APP solution, based on a unified communication protocol framework, using a configurable object model and extensible communication protocol plug-in technology to achieve unified access to various types of terminal devices.

[0024] The fusion terminal communicates with the equipment through the serial port or network port, collects the equipment's telesignaling, telemetry, set value parameters and other data in real time, and can also receive remote control and remote adjustment of the master station's remote control equipment. The collected terminal devices include low-voltage intelligent switches, energy storage devices, etc. The supported communication protocols include serial port DLT645 protocol, serial port Modbus protocol, network ModbusTCP protocol and network IEC104 protocol, etc. The protocol is extensible and supports parallel collection of multiple terminal devices with different protocols, realizing unified access control of source, grid, load and storage equipment.

[0025] Universal source-grid-load-storage access APP framework Figure 4As shown in the figure, the framework is designed based on the method of "multi-interface conversion, multi-protocol conversion, data classification storage, and task message hierarchical drive"; "multi-interface conversion" refers to supporting multiple communication interface modules to meet the physical interface requirements of the equipment. "Multi-protocol conversion" refers to supporting multiple communication protocol modules to meet the access requirements of different communication protocols of the equipment. "Data classification storage" means that after the communication interface and communication protocol conversion, the data is classified and managed according to telemetry, telesignaling, remote control, remote adjustment, SOE, COS, etc., and mapped with the fusion terminal data center object model to meet the access standard of the distribution Internet of Things model. "Task message hierarchical drive" means that the data collection and transmission of different ports are triggered in the form of tasks, plans, and messages to ensure accurate and rapid data collection and regulation. On the one hand, it ensures the timeliness of distribution collection, and on the other hand, it does not affect the collection of marketing meter reading data.

[0026] The universal source-grid-load-storage access APP framework is divided into four layers: communication conversion layer, protocol conversion layer, data cache layer, and application layer. The functions of each layer are as follows: Communication conversion layer: mainly manages various types of channels of the terminal, including RS485 serial port, CAN port, HPLC, Lora wireless extension, Ethernet, etc. It can configure channel type, channel parameters, channel type (master, slave) and other information, and convert the protocol layer message into physical port communication message for transmission, such as serial port management, carrier management, marketing task management TM transparent message and other messages for sending, and convert the received original message into data message used by the protocol.

[0027] Protocol conversion layer: realizes the conversion of acquisition protocols of each end device, can be expanded based on the extensible protocol plug-in library, and supports DLT645, DL698, MODBUS RTU, MODBUS TCP, IEC104 and other protocols.

[0028] Data cache layer: According to the physical model requirements of the power distribution data center, a classified data cache area is established, including telemetry, telesignaling, parameters, remote control, remote adjustment and other data, and the two-way data synchronization function of the data center is realized.

[0029] Application layer: According to the collection tasks and collection plans configured by the collection framework, the reading of distribution equipment is triggered regularly, and remote control and remote adjustment commands are subscribed, converted into protocol commands, and issued.

[0030] The source-grid-load-storage collaborative emergency recovery APP is based on the edge computing of the intelligent fusion terminal in the substation area. It implements the automatic switching control strategy through the software APP, and realizes the fast switching and coordination between the source-load-storage in the distribution substation area in different emergency situations, so as to maximize the reliable power supply of key loads. The strategy includes two processes: the grid-connected to off-grid strategy and the off-grid to grid-connected strategy.

[0031] like Figure 5As shown in the figure, it is the grid-connected to off-grid strategy, the main process is: Step 1: The 10KV high-voltage side of the distribution transformer is out of power, and the intelligent fusion terminal in the substation detects the "power outage" event; Step 2: The intelligent fusion terminal in the substation area determines that the upper level cannot restore power supply and disconnects the low-voltage main switch of the power distribution cabinet; Step 3: The intelligent fusion terminal in the substation calculates whether the low-voltage main switch and outgoing branch load in the substation meet the support capacity requirements of the energy storage system, that is, determines whether the energy storage capacity × support coefficient is greater than the current total load capacity of the substation; Step 4: If the energy storage capacity cannot support the current load in the substation, the load switch that can be removed is determined based on the priority and capacity of the low-voltage outgoing line load and the maximum matching method between the combined load capacity of the outgoing line switch before the power outage and the energy storage capacity, and the low-voltage outgoing line switch is controlled to disconnect; Step 5: Control the energy storage to switch to "off-grid" mode and then start the machine; Step 6: Control the energy storage to switch to the "voltage source" mode, and the black start of the substation is completed.

[0032] like Figure 6 As shown in the figure, it is the control sequence of the grid-connected to off-grid strategy. When the grid loses power, the fusion terminal monitors the grid voltage and frequency, and controls the PCC circuit breaker QF to disconnect, and sends an off-grid signal (including the island detection judgment time). The energy storage system receives the off-grid signal and switches from the grid-connected state to the off-grid state. The energy storage system switches from a constant power source to a constant voltage source, outputting at AC380V 50Hz voltage and frequency to support the operation of loads and charging piles. If a photovoltaic system is connected to the PCC circuit breaker QF total lower bus, the photovoltaic system can continuously provide power to the PCC circuit breaker QF total lower bus.

[0033] like Figure 7 As shown in the figure, it is the off-grid to grid-connected strategy, the main process is: Step 1: The power supply of the upper-level low-voltage main switch of the power distribution cabinet is restored, and the fusion terminal senses the "power restoration" event; Step 2: Control the low-voltage main switch of the power distribution cabinet to close and enter the grid-connected mode; Step 3: Control energy storage shutdown; Step 4: Control the load outgoing line switches that have been cut off to close in sequence; Step 5: To reduce load shock, check the load rate of the distribution transformer in the substation. If charging the energy storage will not cause a heavy overload in the substation, control the energy storage to enter the grid-connected mode, control the energy storage to charge steadily and gradually increase the power to reduce the impact on the power grid and energy storage.

[0034] like Figure 8As shown in the figure, this is the off-grid to grid-connected control sequence. When the power grid resumes power supply, the fusion terminal monitors the voltage and frequency of the PCC grid-connected point and the voltage and frequency of the energy storage system. When the grid-connected conditions are met, it first sends an off-grid command to the energy storage system, and then sends the PCC circuit breaker QF total closing operation (while the circuit breaker QF is always closed, the energy storage system can also complete the off-grid to grid-connected operation). After receiving the grid-connected signal, the energy storage system switches from the off-grid to the grid-connected state, and the energy storage system is converted from the original constant voltage source to a constant power source for grid-connected operation.

[0035] The above description is only an exemplary embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An emergency power supply restoration method based on an intelligent fusion terminal in an area, characterized in that: include: Establishment of emergency power supply restoration system in substations; Establish a micro-application framework based on the intelligent fusion terminal in the substation area, including a general source-grid-load-storage access APP and a source-grid-load-storage collaborative emergency recovery APP; The universal source-grid-load-storage access APP is based on a unified communication protocol framework, adopts a configurable object model and scalable communication protocol plug-in technology, and realizes unified access to various terminal devices; The source-grid-load-storage collaborative emergency recovery APP is based on the edge computing of the intelligent fusion terminal in the substation area and adopts an automated switching control strategy to achieve rapid switching and coordination between sources, loads and storage in the distribution station area under different emergency situations, thereby maximizing the reliable power supply of critical loads.

2. According to claim 1, the emergency power supply restoration method based on the intelligent fusion terminal of the substation is characterized in that: The emergency power supply restoration system has a three-layer architecture of cloud-edge-end, where the cloud includes the distribution cloud master station and the property management platform, the edge includes the substation intelligent fusion terminal, and the end includes the substation source, network, load and storage distributed resources.

3. The method for emergency power supply restoration based on the intelligent fusion terminal of the substation area according to claim 2 is characterized in that: The emergency power supply restoration system includes a distribution cabinet, an intelligent fusion terminal in the substation area, a grid cabinet, and an energy storage system in the substation area; The power distribution cabinet includes a low-voltage main switch and multiple outgoing line switches. The incoming line end of the low-voltage main switch is connected to the distribution transformer. The low-voltage main switch is connected to multiple outgoing line switches through the low-voltage busbar. The outgoing line side of one of the outgoing line switches is connected to the grid-connected cabinet. The intelligent fusion terminal of the substation is connected to the low voltage main outgoing line side; The grid-connected cabinet comprises a low-voltage power switch and a three-phase meter. The power switch inlet of the grid-connected cabinet is connected to an outlet switch of the power distribution cabinet, and the outlet of the power switch is connected to the energy storage system of the station area. The substation energy storage system includes a PCS, a BMS and a battery system.

4. The emergency power supply restoration method based on the intelligent fusion terminal of the substation according to claim 3 is characterized in that: The substation energy storage system uses RS485 to communicate with the substation intelligent fusion terminal, accepts the regulation of the substation intelligent fusion terminal, and realizes the grid-connected and off-grid control of the grid-connected energy storage system based on the micro-application in the substation intelligent fusion terminal; The low-voltage main switch uses RS485 to communicate with the intelligent fusion terminal in the substation area, and accepts the regulation of the intelligent fusion terminal in the substation area, which can realize the rigid control of the grid connection and disconnection of the distribution transformer in the substation area; The substation intelligent fusion terminal communicates with the distribution cloud master station and the property management platform through 4G / 5G communication, and uploads data to the distribution cloud master station; on the distribution cloud master station platform side, the master station can remotely monitor the on-site low-voltage switches and energy storage systems.

5. The method for emergency power supply restoration based on the intelligent fusion terminal of the substation according to claim 2 is characterized in that: The substation intelligent fusion terminal communicates with the equipment through the serial port or network port, collects the remote signaling, telemetry, and fixed parameter data of the equipment in real time, and can receive the remote control and remote adjustment of the remote control equipment of the distribution cloud master station; the collected terminal devices include low-voltage intelligent switches and energy storage devices, and the supported communication protocols include serial port DLT645 protocol, serial port Modbus protocol, network ModbusTCP protocol and network IEC104 protocol. The protocol is extensible and supports parallel collection of terminal devices with multiple different protocols, so as to realize unified access control of source, grid, load and storage equipment.

6. The method for emergency power supply restoration based on the intelligent fusion terminal of the substation according to claim 1 is characterized in that: The universal source-grid-load-storage access APP framework is divided into four layers: communication conversion layer, protocol conversion layer, data cache layer, and application layer; the communication conversion layer manages various types of channels of the terminal; the protocol conversion layer realizes the conversion of the acquisition protocols of each end device, and is expanded based on the extensible protocol plug-in library; the data cache layer establishes a classified data cache area according to the physical model requirements of the distribution data center, including telemetry, telesignaling, parameters, remote control, and remote adjustment data, and realizes the two-way data synchronization function of the data center; the application layer triggers the execution of distribution equipment reading at a regular interval according to the acquisition tasks and acquisition plans configured by the acquisition framework, and subscribes to the remote control and remote adjustment commands, converts them into protocol commands, and issues the commands.

7. The method for emergency power supply restoration based on the intelligent fusion terminal of the substation according to claim 1 is characterized in that: The automatic switching control strategy includes a grid-connected to off-grid strategy and an off-grid to grid-connected strategy.

8. The method for emergency power supply restoration based on the intelligent fusion terminal of the substation area according to claim 7 is characterized in that: The grid-connected to off-grid strategy has the following process: Step 1: The 10KV high-voltage side of the distribution transformer is out of power, and the intelligent fusion terminal in the substation detects the "power outage" event; Step 2: The intelligent fusion terminal in the substation area determines that the upper level cannot restore power supply and disconnects the low-voltage main switch of the power distribution cabinet; Step 3: The intelligent fusion terminal in the substation calculates whether the load of the substation's low-voltage main switch and outgoing branch lines meets the requirements of the energy storage system's support capacity; Step 4: If the energy storage capacity cannot support the current load in the substation, the load switch that can be removed is determined based on the priority and capacity of the low-voltage outgoing line load and the maximum matching method between the combined load capacity of the outgoing line switch before the power outage and the energy storage capacity, and the low-voltage outgoing line switch is controlled to disconnect; Step 5: Control the energy storage to switch to "off-grid" mode and then start the machine; Step 6: Control the energy storage to switch to "voltage source" mode, and the black start of the substation is completed.

9. The method for emergency power supply restoration based on the intelligent fusion terminal of the substation area according to claim 8 is characterized in that: The calculation of whether the total open and outgoing branch loads of the substation area meet the energy storage support capacity requirements is specifically: judging whether the energy storage capacity × support coefficient is greater than the current total load capacity of the substation area.

10. The method for emergency power supply restoration based on the intelligent fusion terminal of the substation area according to claim 7 is characterized in that: The off-grid to grid-connected strategy has the following process: Step 1: The power supply of the upper level of the low-voltage main switch of the power distribution cabinet is restored, and the fusion terminal senses the "power restoration" event; Step 2: Control the low-voltage main switch of the power distribution cabinet to close and enter the grid-connected mode; Step 3: Control energy storage shutdown; Step 4: Control the load outgoing line switches that have been cut off to close in sequence; Step 5: To reduce load shock, check the load rate of the distribution transformer in the substation. If charging the energy storage will not cause a heavy overload in the substation, control the energy storage to enter the grid-connected mode, control the energy storage to charge steadily and gradually increase the power to reduce the impact on the power grid and energy storage.

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