A precise load shedding system and method with a micro load as a controllable resource

Abstract

The present invention discloses a precise load shedding system and method using micro-loads as controllable resources, which at least includes a control master station layer, a control substation layer, and a terminal user access layer; proposes a method for coordinated control of micro-load resources and power intranet resources, and proposes a centralized and refined shedding method for micro-load resources, so that micro-loads can be involved in power grid emergency control, with strong selectivity and little impact on users, effectively reducing the cost of traditional emergency control and minimizing the social impact of power outages.

Description

Technical Field

[0001] The present invention belongs to the technical field of power systems and automation thereof, and mainly relates to a precise load shedding system and method using micro-loads as controllable resources. Background Art

[0002] When multiple DC feeds into a power grid fail to continuously commutate and a fault causes DC lockout, the receiving grid will experience a significant active power deficit, leading to a sharp drop in grid frequency. To mitigate the significant risks posed by frequency drop to grid operation, a frequency emergency coordination and stability control system is typically deployed near the DC drop point. This system, based on the magnitude of the DC power loss, urgently increases the power delivered by adjacent DC lines and removes the corresponding loads on the pumping units and receiving grid to maintain power balance in the receiving grid and suppress frequency drop. However, traditional stabilization control systems typically remove loads from the 110kV, 35kV, and 10kV outgoing lines of substations. Once the stabilization control system is activated, it can cause power outages in many factories and residential areas, resulting in widespread blackouts in the receiving grid and significant social impact.

[0003] The precise load shedding system usually takes the 10kV and 380V load branch circuits that can be interrupted for a short time within the enterprise as the main control object, centralizing the decentralized interruptible loads for millisecond-level precise control. It has little impact on social electricity consumption and can be used to solve the frequency stability problem of large power grids and meet the objective requirements for large-scale load shedding when multiple DC faults occur simultaneously. Summary of the Invention

[0004] The present invention is aimed at the problem that traditional stabilization and control technologies in the existing technology have a great impact on users and are costly. It provides a precise load shedding system and method using micro-loads as controllable resources, which at least includes a control master station layer, a control substation layer and an end-user access layer; proposes a method for coordinated control of micro-load resources and power intranet resources, and a method for centralized and refined shedding of micro-load resources, so that micro-loads can participate in emergency control of the power grid, with strong selectivity and little impact on users, effectively reducing the cost of traditional emergency control and minimizing the social impact of power outages.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a precise load shedding system with micro-loads as controllable resources, comprising at least a control master station layer, a control substation layer and a terminal user access layer; wherein,

[0006] The control master station layer includes a control master station device and related communication equipment; the control master station device is deployed in each province, and a dual set is used. The control master station device is used to receive load shedding capacity control instructions from the upper-level stability control system, perform load distribution, and issue load shedding capacity control instructions to the control substation devices;

[0007] The control substation layer includes control substation devices and related communication equipment; one control substation device is deployed in each prefecture-level city, with two sets of devices in use. The control substation device aggregates the load shedding capacity in the region, uploads it to the control master device, executes the load shedding capacity control instructions of the control master device, and sends load shedding capacity control instructions or full shedding commands to the load aggregation device according to the predetermined control strategy.

[0008] The terminal access layer includes at least load aggregation equipment, edge computing equipment and smart sockets; among them,

[0009] The load aggregation device is deployed in each park or residential area to achieve load aggregation in the park or residential area, and transmits the total amount of load that can be cut to the control substation device. The control substation device receives the load shedding capacity control instruction or full shedding command from the control substation device, and sends the load shedding instruction to the edge computing device according to the predetermined control strategy;

[0010] The edge computing device is deployed in each building, collects the load shedding information sent by all smart sockets in the building, and sends the total load shedding information to the load aggregation device; receives the load shedding instruction sent by the load aggregation device, and sends the load shedding instruction to all smart sockets under its jurisdiction;

[0011] The smart sockets are deployed in several locations in each office or home to collect and calculate the power of micro-loads in real time and send it to the edge computing device. Upon receiving the load shedding instruction from the edge computing device, the smart sockets automatically cut off the power to shelve the micro-loads.

[0012] To achieve the above objectives, the present invention also adopts a technical solution: a precise load shedding method using micro-loads as controllable resources. In allocating the load shedding method of the control substation device, the control substation device sets different priority values for all its controllable resources and sorts them according to the priority to form a controllable resource shedding sequence table for the integrated internal and external networks. According to the required shedding quantity Q, the controllable resource shedding sequence table for the integrated internal and external networks is gradually compared from top to bottom:

[0013] If Q 外i , then the load shedding capacity allocated to load aggregation device i is Q, and the control substation device sends a command to shelve load capacity Q to load aggregation device i, without cutting off other controllable resources;

[0014] If Q 外i <Q<(Q 外i +Q 外j ), then the load aggregation device i is completely cut off, and the load shedding capacity allocated to the load aggregation device j is QQ 外i , the control substation device sends a full cut command to the load aggregation device i, and sends a load cut capacity QQ to the load aggregation device j. 外i ​The command does not cut off other controllable resources;

[0015] If (Q 外i +Q 外j ) <Q<(Q 外i +Q 外j +Q 外k ), then load aggregation device i and load aggregation device j are completely cut off, and the load shedding capacity allocated to load aggregation device k is QQ 外i -Q 外j , the control substation device sends a full cut command to load aggregation device i and load aggregation device j, and sends a load cut capacity QQ to load aggregation device k 外i -Q 外j The command does not cut off other controllable resources;

[0016] Where Q is the required cutting amount, Q 外i is the cuttable capacity of load aggregation device i, Q 外j is the cuttable capacity of load aggregation device j, Q 外k is the cuttable capacity of load aggregation device k; the priorities of load aggregation devices i, j, and k are i higher than j, j higher than k; and so on, the micro-loads sent by the load aggregation devices are cut off until all the controllable resources of the external network micro-loads are cut off.

[0017] Compared with the existing technology, the present invention has the following beneficial effects: the present invention provides a precise load shedding system and method with micro-loads as controllable resources, and connects small loads such as civil loads and commercial loads to the precise load shedding system as controllable resources, providing more flexible and diversified control resources for the safe and stable control of the power system. It has the advantages of many points and wide coverage, strong selectivity, and little impact on users, effectively reducing the cost of traditional emergency control, which is conducive to promoting the structural reform of the energy supply side and the large-scale development and utilization of clean energy, cultivating and establishing a sound market-oriented demand response mechanism, and improving social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the architecture and networking structure diagram of the system of the present invention;

[0019] Figure 2 Schematic diagram of wireless communication architecture between the control substation device and the load aggregation device in the system of the present invention;

[0020] Figure 3 Schematic diagram of a method for allocating load shedding measures for controlling substation devices in the method of the present invention;

[0021] Figure 4 It is a schematic diagram of a method for distributing load shedding measures of load aggregation equipment in the method of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0023] Example 1

[0024] A precise load shedding system using micro loads as controllable resources, like Figure 1 As shown in the figure, the architecture is generally divided into three layers, namely the control master station layer, the control substation layer, and the terminal user access layer.

[0025] The master control station layer includes the master control station device and related communication equipment. A dual-device master control station is deployed in each province. The master control station receives load shedding and capacity control commands from the upper-level stability control system, distributes the load, and issues load shedding and capacity control commands to the sub-control stations.

[0026] The control substation layer includes control substation devices and related communication equipment. A dual-device configuration is deployed in each prefecture-level city. The control substation aggregates the available load shedding capacity in the region and uploads it to the master control station. The control substation executes the master control station's load shedding capacity control instructions and sends load shedding capacity control instructions or full shedding commands to the load aggregation devices according to predefined control strategies.

[0027] The terminal access layer includes load aggregation devices, edge computing devices, and smart sockets.

[0028] Load aggregation equipment: A load aggregation device is deployed in each park or residential community to achieve load aggregation of the park or residential community, and send the total amount of cuttable load to the control substation device, receive the load cutting capacity control instruction or full cut command sent by the control substation device, and send the load shedding instruction to the edge computing device according to the predetermined control strategy.

[0029] Edge computing devices are deployed in each building to collect the cuttable loads sent by all smart sockets in the building, and send the total cuttable load to the load aggregation device; receive the load shedding instructions sent by the load aggregation device, and send the load shedding instructions to all smart sockets under its jurisdiction.

[0030] Smart sockets: Each office or home is equipped with several smart sockets, which power micro-loads such as air conditioners, water heaters, and washing machines. These sockets collect and calculate the power of these micro-loads in real time and transmit it to edge computing devices. When these devices send load shedding instructions, they automatically shut down the power supply to remove the micro-loads.

[0031] The communication network between the control substation and the load aggregation device uses fiber optic cable when wired connections are available; otherwise, wireless 5G / 4G is used. The load aggregation device transmits the total amount of shelvable load to the control substation, which then sends load shedding capacity control instructions or full shedding commands to the load aggregation device, as shown in the table below.

[0032] Control substation device->load aggregation equipment Load aggregation equipment->control substation device Load shedding capacity control command or full shedding command Total load that can be cut

[0033] When wireless 5G / 4G communication is used between the control substation device and the load aggregation device, for network security considerations, a security measure of vertical encryption + horizontal isolation is proposed to ensure the network communication security between the control substation device and the load aggregation device, such as Figure 2 shown.

[0034] CPE is a customer terminal device used to realize the conversion between wired communication and wireless communication. CPE is deployed at the control substation layer and the terminal access layer respectively. Through the wireless 5G / 4G network, remote wireless 5G / 4G communication between the control substation device and the load aggregation device is realized.

[0035] The vertical encryption device at the control substation layer and the vertical encryption device at the terminal access layer are used in pairs and adopt power-specific cryptographic algorithms to encrypt and protect the transmitted data, ensuring the authenticity, confidentiality and integrity of the data, and ensuring that terminal access is trustworthy and data transmission is reliable.

[0036] At the control substation layer, forward and reverse isolation devices are implemented to ensure the legal access of load aggregation devices and the security of access data, enabling secure information exchange between internal and external networks. In addition to the forward and reverse isolation devices, front-end servers and back-end servers are deployed on both sides of the forward and reverse isolation devices to ensure accurate load shedding and proper communication of service data. The back-end servers communicate with the control substation devices via Ethernet, while the front-end servers communicate with all load aggregation devices under the control substation devices via Ethernet. The back-end servers identify control commands from the control substation devices, convert them into specially formatted data, and send them to the forward isolation devices. The forward isolation devices then forward the data to the front-end servers. The front-end servers analyze the command source and content, determine the target, and ultimately transmit the command to the designated load aggregation devices via the wireless network. The front-end servers identify the load shedding information and abnormality information sent by the load aggregation devices, convert them into specially formatted data, and send them to the reverse isolation devices. The reverse isolation devices then forward the data to the back-end servers. The back-end servers analyze the data, determine the load aggregation device information, and then transmit it to the control substation devices via Ethernet.

[0037] The load aggregation device and edge computing device communicate via fiber optic cable. The edge computing device transmits the total amount of shelvable load to the load aggregation device, which then sends load shedding instructions to the edge computing device, as shown in the following table.

[0038] Load aggregation equipment -> edge computing equipment Edge computing equipment -> load aggregation equipment Load shedding command Total load that can be cut

[0039] The edge computing device and the smart socket use wireless communication methods such as WiFi and LoRa. The smart socket transmits the power of the micro-load to the edge computing device, which then sends the load shedding command to the smart socket, as shown in the following table.

[0040] Edge computing device -> smart socket Smart socket -> edge computing device Load shedding command Micro load power

[0041] A precise load shedding method using a micro-load as a controllable resource implemented by the system of this embodiment, in the method for allocating load shedding measures for controlling the substation device:

[0042] First, the control substation device sets different priority values for all its controllable resources and sorts them by priority, forming a controllable resource removal order table for both the internal and external networks, as shown in the table below. Controllable resources consist of two components: external power resources delivered by all load aggregation devices under its control, and internal power resources such as the station's 10kV, 35kV, and 110kV load lines.

[0043] Priority Controllable resources Cuttable load capacity Priority 1 Load aggregation equipment <![CDATA[Q 外i ]]> Priority 2 Load aggregation equipment <![CDATA[Q 外j ]]> Priority 3 Load aggregation device k <![CDATA[Q 外k ]]> …… …… Priority N Load aggregation equipment <![CDATA[Q 外n ]]> Priority N+1 Station load line i <![CDATA[Q 内i ]]> Priority N+2 Station load line j <![CDATA[Q 内j ]]> Priority N+3 Station load line k <![CDATA[Q 内k ]]> …… …… Priority N+M Station load line m <![CDATA[Q 内m ]]>

[0044] The priority value of the load aggregation device is lower than the priority value of the power network resources, so that when it is necessary to control the substation device to cut the load, the micro load can be cut off first, avoiding the cutting of the power network resources as much as possible, reducing the social impact of the power outage. Then, according to the required cutting quantity Q, the controllable resource cutting sequence table of the internal and external networks is gradually compared from top to bottom, such as Figure 3 shown.

[0045] If Q 外i , then the load shedding capacity allocated to the load aggregation device i is Q. The control substation device sends a command to shedding the load capacity Q to the load aggregation device i, without shedding other controllable resources.

[0046] If Q 外i <Q<(Q 外i +Q 外j ), then the load aggregation device i is completely cut off, and the load shedding capacity allocated to the load aggregation device j is QQ 外i The control substation sends a full cut command to load aggregation device i and a load shedding capacity QQ to load aggregation device j. 外i The command does not cut off other controllable resources. ​

[0047] If (Q 外i +Q 外j ) <Q<(Q 外i +Q 外j +Q 外k ), then load aggregation device i and load aggregation device j are completely cut off, and the load shedding capacity allocated to load aggregation device k is QQ 外i -Q 外j The control substation device sends a full cut command to load aggregation device i and load aggregation device j, and sends a load cut capacity QQ to load aggregation device k. 外i -Q 外j The command does not cut off other controllable resources.

[0048] Among them, Q is the required cutting amount, Q 外i is the cuttable capacity of load aggregation device i, Q 外j is the cuttable capacity of load aggregation device j, Q 外k is the cuttable capacity of load aggregation device k; further, the priority of load aggregation device i is higher than that of load aggregation device j, and the priority of load aggregation device j is higher than that of load aggregation device k. When the control substation allocates the load external network cut-off capacity, it starts with load aggregation device i, then load aggregation device j, and then load aggregation device k, and so on.

[0049] Similarly, the micro-loads sent from the load aggregation device are cut off until all controllable resources of the external network micro-loads are cut off.

[0050] If Q>∑Q 外 ,∑Q 外 If the total available power is from all load aggregation devices, all load aggregation devices must be disconnected. In addition, the station's 10kV, 35kV, and 110kV load lines and other intranet resources must also be disconnected. Load line disconnection is based on the principle of minimal over-disconnection. The specific disconnection method is as follows.

[0051] If ∑Q 外 <Q<(∑Q 外 +Q 内i ), all load aggregation devices must be fully disconnected, and load line i within the station is disconnected at the same time. The control substation device sends a full disconnect command to all load aggregation devices, and the actuation outlets simultaneously disconnect load line i within the station.

[0052] If (∑Q 外 +Q 内i ) <Q<(∑Q 外 +Q 内i +Q 内j), all load aggregation devices must be fully disconnected, and load lines i and j within the station are disconnected at the same time. The control substation device sends a full disconnect command to all load aggregation devices, and the actuation outlets simultaneously disconnect load lines i and j within the station.

[0053] If (∑Q 外 +Q 内i +Q 内j ) <Q<(∑Q 外 +Q 内i +Q 内j +Q 内k ), all load aggregation devices are fully disconnected, simultaneously disconnecting load lines i, j, and k within the station. The control substation device sends a full disconnect command to all load aggregation devices, and simultaneously activates the outlet to disconnect load lines i, j, and k within the station.

[0054] Among them, ∑Q 外 The total amount of cuttable material sent by all load aggregation devices, Q 内i is the cuttable capacity of load line i within the station, Q 内j is the cuttable capacity of load line j within the station, Q 内k is the cuttable capacity of the intra-station load line k; further, the priority of the intra-station load line i is higher than that of the intra-station load line j, and the priority of the intra-station load line j is higher than that of the intra-station load line k. When the control substation allocates the load network cut-off capacity, it starts with the intra-station load line i, then the intra-station load line j, and then the intra-station load line k, and so on.

[0055] In this way, the substation device is controlled to complete the distribution of load shedding measures.

[0056] A precise load shedding method using micro-loads as controllable resources, in a method for allocating load shedding measures for load aggregation equipment:

[0057] First, the load aggregation device sets different priority values for all the edge computing devices under its jurisdiction and sorts them according to the priority to form a micro-load controllable resource removal sequence table, as shown in the following table.

[0058] Priority Micro-load controllable resources Cuttable load capacity Priority 1 Edge computing devices <![CDATA[W i ]]> Priority 2 Edge computing devices <![CDATA[W j ]]> Priority 3 Edge computing devices <![CDATA[W k ]]> …… …… Priority N Edge computing devices <![CDATA[W n ]]>

[0059] Then, process the command type sent by the control substation device separately, such as Figure 4 shown.

[0060] If a full cut command is received, a load shedding instruction is sent to all edge computing devices under its jurisdiction.

[0061] If a load shedding capacity control instruction is received, the load shedding capacity control system will compare the load shedding order table of micro-load controllable resources from top to bottom based on the required shedding capacity W. The load shedding instruction will be sent to the corresponding edge computing device using the minimum over-scaling principle. The specific method is as follows:

[0062] If W <W i , the load aggregation device sends a load shedding instruction to edge computing device i, without shedding other edge computing devices.

[0063] If W i <W<(W i +W j ), the load aggregation device sends a load shedding instruction to edge computing device i and edge computing device j at the same time, without shedding other edge computing devices.

[0064] If (W i +W j ) <W<(W i +W j +W k ), the load aggregation device sends load shedding instructions to edge computing device i, edge computing device j and edge computing device k at the same time, without shedding other edge computing devices.

[0065] Among them, W i is the scalable capacity of edge computing device i, W j is the scalable capacity of edge computing device j, W k is the cuttable capacity of edge computing device k; further, the priority of edge computing device i is higher than that of edge computing device j, and the priority of edge computing device j is higher than that of edge computing device k. When the load aggregation device distributes the load cutting method, it starts with edge computing device i, then edge computing device j, and then edge computing device k, and so on.

[0066] Similarly, the load aggregation device completes the distribution of load shedding measures.

[0067] In summary, the method presented in this paper utilizes microloads as controllable resources for load shedding, proposes a method for coordinated control of microload resources and intranet resources, and proposes a centralized and refined method for removing microload resources. Microload participation in grid emergency control offers advantages such as widespread access, high selectivity, and minimal impact on users. This effectively reduces the cost of traditional emergency control and minimizes the social impact of power outages.

[0068] It should be noted that the above content merely illustrates the technical idea of the present invention and cannot be used to limit the scope of protection of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications all fall within the scope of protection of the claims of the present invention.

Claims

1. A precise load shedding system using micro-loads as controllable resources, characterized by: It includes at least the control master station layer, the control substation layer and the terminal user access layer; among which, The control master station layer includes a control master station device and related communication equipment; the control master station device is deployed in each province, and a dual set configuration is adopted. The control master station device is used to receive load shedding capacity control instructions from the upper-level stability control system, perform load distribution, and issue load shedding capacity control instructions to the control substation devices; The control substation layer includes control substation devices and related communication equipment. Each prefecture-level city deploys one control substation device, with two sets configured. The control substation devices aggregate the load shedding capacity in the region, upload it to the control master device, and execute the load shedding capacity control instructions from the control master device. Based on the predetermined control strategy, they send load shedding capacity control instructions or full shedding commands to the load aggregation device. In allocating load shedding methods, the control substation devices set different priority values for all controllable resources under their jurisdiction and sort them according to priority, forming a controllable resource shedding sequence table for the integrated internal and external networks. Based on the required shedding capacity, Q, the controllable resources in the integrated internal and external networks are compared from top to bottom: If Q 外i , then the load shedding capacity allocated to load aggregation device i is Q, and the control substation device sends a command to shedding load capacity Q to load aggregation device i, without cutting off other controllable resources;​ If Q 外i <Q<(Q 外i +Q 外j ), then the load aggregation device i is completely cut off, and the load shedding capacity allocated to the load aggregation device j is QQ 外i , the control substation device sends a full cut command to the load aggregation device i, and sends a load cut capacity QQ to the load aggregation device j. 外i The command does not cut off other controllable resources; If (Q 外i +Q 外j ) <Q<(Q 外i +Q 外j +Q 外k ), then load aggregation device i and load aggregation device j are completely cut off, and the load shedding capacity allocated to load aggregation device k is QQ 外i -Q 外j , the control substation device sends a full cut command to load aggregation device i and load aggregation device j, and sends a load cut capacity QQ to load aggregation device k 外i -Q 外j The command does not cut off other controllable resources; Among them, Q is the required cutting amount, Q 外i is the cuttable capacity of load aggregation device i, Q 外j is the cuttable capacity of load aggregation device j, Q 外k is the scalable capacity of load aggregation device k; the priority of load aggregation devices i, j, and k is i higher than j, and j higher than k; Similarly, the micro-loads sent by the load aggregation device are cut off until all controllable resources of the external network micro-loads are cut off; In the allocation of load shedding methods for controlling substation devices, if Q>∑Q 外 ,∑Q 外 If the total amount of cuttable power sent by all load aggregation devices is cut, all load aggregation devices must be cut off. At the same time, the power network resources of the 10kV, 35kV, and 110kV load lines in the station must also be cut off. The principle of minimum overcutting is adopted for the cutoff of load lines. The specific cutting method is as follows: If ∑Q 外 <Q<(∑Q 外 +Q 内i ), all load aggregation devices must be fully cut off, and the load line i in the station is cut off at the same time; the control substation device sends a full cut command to all load aggregation devices, and the action outlet cuts off the load line i in the station at the same time; If (∑Q 外 +Q 内i ) <Q<(∑Q 外 +Q 内i +Q 内j ), all load aggregation devices must be fully cut off, and load lines i and j in the station are cut off at the same time; the control substation device sends a full cut command to all load aggregation devices, and the action outlets cut off load lines i and j in the station at the same time; If (∑Q 外 +Q 内i +Q 内j ) <Q<(∑Q 外 +Q 内i +Q 内j +Q 内k ), all load aggregation devices must be fully cut off, and load lines i, j, and k in the station are cut off at the same time; the control substation device sends a full cut command to all load aggregation devices, and the actuation outlets simultaneously cut off load lines i, j, and k in the station; Among them, ∑Q 外 The total amount of cuttable material sent by all load aggregation devices, Q 内i is the cuttable capacity of load line i within the station, Q 内j is the cuttable capacity of load line j within the station, Q 内k is the cuttable capacity of load line k within the station; the priority of load lines i, j, and k within the station is i higher than j, and j higher than k; By analogy, the substation device is controlled to complete the distribution of load shedding measures; The terminal access layer includes at least load aggregation equipment, edge computing equipment and smart sockets; among them, The load aggregation device is deployed in each park or residential area to achieve load aggregation in the park or residential area, and transmits the total amount of load that can be cut to the control substation device. The control substation device receives the load shedding capacity control instruction or full shedding command from the control substation device, and sends the load shedding instruction to the edge computing device according to the predetermined control strategy; The edge computing device is deployed in each building, collects the load shedding information sent by all smart sockets in the building, and sends the total load shedding information to the load aggregation device; receives the load shedding instruction sent by the load aggregation device, and sends the load shedding instruction to all smart sockets under its jurisdiction; The smart sockets are deployed in several locations in each office or home to collect and calculate the power of micro-loads in real time and send it to the edge computing device. Upon receiving the load shedding instruction from the edge computing device, the smart sockets automatically cut off the power to shelve the micro-loads.

2. A precise load shedding system using micro-loads as controllable resources as claimed in claim 1, characterized in that: The control substation device communicates with the load aggregation device via optical fiber or wireless 5G / 4G; CPE is deployed at the control substation layer and terminal access layer respectively, and remote wireless 5G / 4G communication between the control substation device and the load aggregation device is realized through the wireless 5G / 4G network.

3. A precise load shedding system using micro-loads as controllable resources as claimed in claim 2, characterized in that: The control substation layer is equipped with a forward isolation device and a reverse isolation device, and a front-end server and a back-end server are respectively configured on both sides of the forward and reverse isolation devices; the back-end server communicates with the control substation device via Ethernet, and the front-end server communicates with all load aggregation devices under the control substation device via Ethernet; The back-end server will identify the control command of the substation device, convert it into data in a special format and send it to the forward isolation device, which will then move the data to the front-end server. The front-end server analyzes the command source and content, determines the command target, and sends the command to the designated load aggregation device via the wireless network; The front-end server identifies the information sent by the load aggregation device, converts it into data in a special format and sends it to the reverse isolation device. The reverse isolation device moves the data to the back-end server; the back-end server parses the data content, determines the information of the load aggregation device, and then sends it to the control substation device via Ethernet.

4. The precise load shedding system using micro-loads as controllable resources according to claim 1, characterized in that: The load aggregation device communicates with the edge computing device using optical fiber wired communication; the edge computing device communicates with the smart socket through wireless communication.

5. A precise load shedding system using micro-loads as controllable resources as claimed in claim 4, characterized in that: In the load shedding method allocation of the load aggregation device, the load aggregation device sets different priority values for all the edge computing devices under its jurisdiction and sorts them according to the priority to form a micro-load controllable resource shedding sequence table. Then, it processes them separately according to the command type sent by the control substation device; If a full cut command is received, a load shedding instruction is sent to all edge computing devices under its jurisdiction; If the load shedding capacity control instruction received is based on the required shedding amount W, the load shedding order table of micro-load controllable resources is compared step by step from top to bottom, and the minimum over-cutting principle is adopted to send the load shedding instruction to the corresponding edge computing device.

6. A precise load shedding system using micro-loads as controllable resources as claimed in claim 5, characterized in that: The specific method of sending load shedding instructions to the corresponding edge computing devices by comparing them step by step from top to bottom in the micro-load controllable resource shedding sequence table and using the minimum over-cutting principle is as follows: If W <W i , then the load aggregation device sends a load shedding instruction to edge computing device i, without shedding other edge computing devices; If W i <W<(W i +W j ), the load aggregation device sends a load shedding instruction to edge computing device i and edge computing device j at the same time, without shedding other edge computing devices; If (W i +W j ) <W<(W i +W j +W k ), the load aggregation device sends a load shedding instruction to edge computing device i, edge computing device j, and edge computing device k at the same time, without shedding other edge computing devices; Among them, W i is the scalable capacity of edge computing device i, W j is the scalable capacity of edge computing device j, W k is the scalable capacity of edge computing device k; the priority of edge computing devices i, j, and k is i higher than j, and j higher than k; Similarly, the load aggregation device completes the distribution of load shedding measures.

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