Power distribution network collaborative self-healing control method and terminal

Abstract

The application provides a power distribution network cooperative self-healing control method and a terminal. The method comprises the following steps: setting base stations and self-healing devices in different voltage regions of a power distribution network, and the self-healing devices communicate with the corresponding base stations through CPE terminals, and all the base stations communicate through a core network; the power distribution network cooperative self-healing control method further comprises the following steps: detecting whether all the self-healing devices in the power distribution network are in normal communication; when all the self-healing devices are in normal communication, a first station area self-healing device arranged on a high-voltage side of a fault is started to perform self-healing operation, and a first region self-healing device corresponding to a region where a low-voltage side fault line is located is controlled to be closed; when the self-healing operation of the first station area self-healing device is unsuccessful, the first region self-healing device is controlled to be started to perform self-healing operation. The application can realize effective and high-speed cooperative cooperation between different voltage levels.

Description

Technical Field

[0001] This invention relates to the field of power grid fault self-healing technology, and in particular to a distribution network collaborative self-healing control method and terminal. Background Technology

[0002] The revolution in information technology and the application of new power distribution technologies have propelled the process of intelligent power distribution networks. Intelligent power distribution networks organically integrate and fuse various new power distribution technologies, resulting in revolutionary changes in system performance. Fault self-healing control is one of the key characteristics of smart city power grids. Simply put, fault self-healing refers to the self-repair process of the urban power grid after a fault occurs. The self-healing system monitors the grid's operating status in real time through information systems and auxiliary equipment, promptly predicts equipment defects, and achieves rapid autonomous location, isolation, and restoration of power supply for distribution network faults, ensuring uninterrupted power supply to users.

[0003] The self-healing function of urban power grids relies on corresponding control methods. Traditional urban power grid control methods are mostly local control or centralized control by a master station. These methods have drawbacks such as slow processing speed and inflexible control. However, with the development of distribution terminal devices and communication technology, a distributed control mode has gradually emerged. This mode does not rely on a distribution master station, but instead decentralizes all urban power grid functions to terminal devices installed at various nodes of the urban power grid, relying on information exchange between terminals to achieve the intended functions.

[0004] However, both the centralized control method and the distributed control method are designed to achieve self-healing of faults in distribution networks of the same voltage level. Coordination between different voltage levels is achieved through fixed delays, lacking effective high-speed coordination. Summary of the Invention

[0005] This invention provides a distribution network collaborative self-healing control method and terminal to solve the problems of single voltage level and slow coordination speed in existing power grid self-healing control methods.

[0006] In a first aspect, embodiments of the present invention provide a method for coordinated self-healing control of a power distribution network, comprising:

[0007] Base stations and self-healing devices are respectively set up in different voltage areas of the distribution network, and the self-healing devices communicate with the corresponding base stations through wireless terminal access equipment (Customer PremiseE, CPE) terminals. All base stations communicate through the core network. The distribution network coordinated self-healing control method also includes:

[0008] Check whether all self-healing devices in the power distribution network are communicating normally;

[0009] When all the self-healing devices are communicating normally, the first station domain self-healing device set on the high voltage side of the fault starts to perform self-healing operation, and controls the first area self-healing device corresponding to the area where the faulty line on the low voltage side is located to shut down.

[0010] If the self-healing operation of the first station domain self-healing device fails, control the first area self-healing device to start the self-healing operation.

[0011] In one possible implementation, the first station domain self-healing device located on the high-voltage side of the fault is activated to perform a self-healing operation, including:

[0012] When a fault occurs in the inter-station line on the high-voltage side, the first station area self-healing device installed on the faulty high-voltage side controls the switch installed on the faulty line on the high-voltage side to trip, and controls the switch installed on the bus connecting the faulty line and the normal line on the high-voltage side to close.

[0013] When the low-voltage side busbar loses power due to a fault in the high-voltage side line, the first station area self-healing device installed on the faulty high-voltage side controls the switch installed on the faulty line on the low-voltage side to trip, and controls the switch installed on the busbar connecting the faulty line and the normal line on the low-voltage side to close.

[0014] In one possible implementation, when the self-healing operation of the first station domain self-healing device fails, the first area self-healing device is controlled to initiate a self-healing operation, including:

[0015] When a fault occurs in the inter-station line on the high-voltage side, and the self-healing operation of the first station area self-healing device fails, the first station area self-healing device sends an acceleration action command to the first area self-healing device. After receiving the acceleration action command, the first area self-healing device controls the switch installed on the faulty line connected to the high-voltage line on the low-voltage side to trip, and controls the switch installed on the bus connecting the faulty line connected to the high-voltage line on the low-voltage side and the normal line to close.

[0016] In one possible implementation, when the self-healing operation of the first station domain self-healing device fails, the first area self-healing device is controlled to initiate a self-healing operation, including:

[0017] When the low-voltage side busbar loses power due to a fault on the high-voltage side line, and the self-healing operation of the first station area self-healing device fails, the first station area self-healing device sends an acceleration action command to the first area self-healing device. After receiving the acceleration action command, the first area self-healing device controls the switch installed on the faulty line connected to the low-voltage line on the low-voltage side to trip, and controls the switch installed on the normal line on the low-voltage side to close.

[0018] In one possible implementation, when the self-healing operation of the first station domain self-healing device fails, the first area self-healing device is controlled to initiate a self-healing operation, including:

[0019] When a fault occurs on the inter-station line on the high-voltage side, and the self-healing operation of the first station area self-healing device fails, the first area self-healing device is activated and self-healing operation is performed after a delay according to the first tripping time setting.

[0020] One possible implementation also includes:

[0021] When a switch on a low-voltage line connected to a high-voltage line is detected to have tripped, the station self-healing device on the high-voltage side and the area self-healing device on the low-voltage side are locked.

[0022] In one possible implementation, after detecting whether all self-healing devices in the distribution network are communicating normally, the method further includes:

[0023] When all the self-healing devices are in communication failure, if the high-voltage side inter-station line fails and loses power, the first station area self-healing device set on the high-voltage side and the first area self-healing device corresponding to the area where the low-voltage side fault line is located will be activated simultaneously and perform self-healing operation.

[0024] When the self-healing operation of the first station domain self-healing device is successful, the self-healing device of the first area is turned off.

[0025] If the self-healing operation of the first station domain self-healing device fails, the first area self-healing device continues to perform the self-healing operation.

[0026] In one possible implementation, the first station-area self-healing device located on the high-voltage side of the fault and the first area self-healing device corresponding to the area where the faulty line is located on the low-voltage side are simultaneously activated and perform self-healing operations, including:

[0027] The first substation self-healing device set on the high-voltage side of the fault and the first area self-healing device corresponding to the area where the faulty line is located on the low-voltage side are activated simultaneously. The first substation self-healing device performs self-healing operation after a preset delay, and the first area self-healing device performs self-healing operation after a delay according to the second tripping time setting.

[0028] In one possible implementation, after detecting whether all self-healing devices in the distribution network are communicating normally, the method further includes:

[0029] When all the self-healing devices are in communication failure, if the low-voltage side inter-station line fails and loses power, the first area self-healing device set on the faulty low-voltage side is activated and performs self-healing operation after a delay according to the second tripping time setting value, and the first station area self-healing device corresponding to the area where the faulty line is located is shut down.

[0030] In a second aspect, embodiments of the present invention provide a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method described in the first aspect or any possible implementation thereof.

[0031] This invention provides a distribution network collaborative self-healing control method and terminal. By setting up base stations and self-healing devices in different voltage zones within the distribution network, and having the self-healing devices communicate with corresponding base stations via CPE terminals, and all base stations communicating through the core network, the distribution network collaborative self-healing control method further includes: detecting whether all self-healing devices in the distribution network are communicating normally; when all self-healing devices are communicating normally, if a high-voltage side inter-station line fault causes power loss, a first substation self-healing device set on the faulty high-voltage side is activated to perform a self-healing operation, while controlling the first area self-healing device corresponding to the area where the faulty low-voltage side line is located to shut down; if the self-healing operation of the first substation self-healing device fails, controlling the first area self-healing device to activate to perform a self-healing operation. This invention sets up base stations and self-healing devices in different voltage areas of the distribution network. The self-healing devices communicate with the corresponding base stations through CPE terminals. It adopts a network mode of self-healing devices of different voltage levels. The self-healing devices of the distribution network are configured in the high voltage level substation to realize the optimized coordination of the self-healing time of the distribution network of different voltage levels in the substation. By using the self-healing devices of the substation and the regional self-healing system, the regional self-healing of the low voltage distribution network is realized, thereby realizing the coordinated high-speed self-healing control of the multi-voltage level distribution network. The control method is flexible and easy to operate. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a flowchart illustrating the implementation of a collaborative self-healing control method for power distribution networks provided in an embodiment of the present invention.

[0034] Figure 2 This is a schematic diagram of the collaborative self-healing of a chain-structured power distribution network provided in an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the collaborative self-healing of a ring network structure distribution network provided in an embodiment of the present invention;

[0036] Figure 4 This is a flowchart of the power distribution network collaborative self-healing control method provided in the embodiments of the present invention;

[0037] Figure 5 This is a schematic diagram of the system provided in an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of the terminal provided in an embodiment of the present invention. Detailed Implementation

[0039] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0040] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0041] Figure 1 The flowchart illustrates the implementation of a distribution network collaborative self-healing control method according to an embodiment of the present invention. In this method, base stations and self-healing devices are set up in different voltage zones of the distribution network. The self-healing devices communicate with the corresponding base stations through CPE terminals, and all base stations communicate through the core network.

[0042] The structure of a power distribution network can be a chain structure, a ring network structure, etc.

[0043] Self-healing devices include station-level self-healing devices or regional self-healing devices. These devices are responsible for collecting information such as voltage, current, and switch positions of incoming and outgoing lines at the station, as well as controlling the incoming and outgoing lines and tie switches. Based on the collected information, the self-healing devices can analyze changes in the power grid topology, issue operating commands, and complete the restoration of power supply to the power grid, achieving high-speed self-healing with multi-voltage level coordination.

[0044] The self-healing device connects to the CPE terminal via a network cable. The CPE terminal then interacts with the corresponding base station via a wireless network. All base stations communicate through the core network. These base stations can be 4G or 5G base stations, etc.

[0045] Optionally, a signal receiving module can be added to the self-healing device. The self-healing device and the signal receiving module can be connected via a serial port or a network cable. The signal receiving module can be a 4G or 5G signal receiving module.

[0046] Optionally, at the protocol layer, the electrical quantity sampling calculation data can be transmitted using R-SV, R-Generic Object Oriented Substation Event (R-GOOSE) protocol, or Transmission Control Protocol (TCP) / Internet Protocol (IP) protocol conforming to IEC 61850.

[0047] The method for coordinated self-healing control of power distribution networks is described in detail below.

[0048] Step 101: Check whether all self-healing devices in the power distribution network are communicating normally.

[0049] Optionally, different self-healing control methods can be selected based on the communication status of the self-healing devices, where the communication status can be normal or abnormal. When all self-healing devices in the distribution network are communicating normally, step 102 is executed.

[0050] In one implementation, after detecting whether all self-healing devices in the distribution network are communicating normally, the method may further include:

[0051] When all self-healing devices malfunction, if the high-voltage side inter-station line fails and loses power, the first station area self-healing device set on the high-voltage side and the first area self-healing device corresponding to the area where the low-voltage side fault line is located will be activated simultaneously and perform self-healing operations.

[0052] The first station area self-healing device performs its self-healing operation after a preset delay, which can be set according to requirements. The first area self-healing device performs its self-healing operation after a delay according to a second trip time setting. The second trip time setting is used to coordinate with the self-healing operation time of the first station area self-healing device. Generally, the second trip time setting is set to be greater than the preset time, so that the first station area self-healing device completes its self-healing operation before the first area self-healing device.

[0053] When the self-healing device of the first station area successfully completes its self-healing operation, the self-healing device of the first area is turned off.

[0054] If the self-healing operation of the first station domain self-healing device fails, the self-healing operation of the first area self-healing device will continue.

[0055] See Figure 2The diagram shows a chain-structured distribution network with collaborative self-healing capabilities. The distribution network consists of different voltage levels: 220kV, 110kV, and 35kV. Specifically, the 110kV distribution network is a chain-structured network composed of the 110kV sections of 220kV substation A, 220kV substation B, 110kV substation C, and 110kV substation D. The 35kV distribution network is a daisy-chain structured network composed of the 35kV sections of 110kV substation C, 110kV substation D, 35kV substation E, and 35kV substation F.

[0056] The inter-station lines between substations A and C are equipped with switch 121, switch 181, transformer S1, switch 311, and switch 3812; the inter-station lines between substations B and C are equipped with switch 161, switch 182, transformer S2, switch 312, and switch 3821. Two busbars connect the two inter-station lines between substations A, B, and C. Switch 101 is installed on the high-voltage side busbar, and switch 3012 is installed on the low-voltage side busbar. The output of substation A is connected to the input of switch 121, the output of switch 121 is connected to the input of switch 181, the output of switch 181 is connected to the input of transformer S1, switch 101 is located on the high-voltage side busbar between switch 181 and transformer S1, the output of transformer S1 is connected to the input of switch 311, the output of switch 311 is connected to switch 3812, and switch 3012 is located on the low-voltage side busbar between switch 311 and switch 3812. The output terminal of substation B is connected to the input terminal of switch 161. The output terminal of switch 161 is connected to the input terminal of switch 182. The output terminal of switch 182 is connected to the input terminal of transformer S2. Switch 101 is installed on the high-voltage side bus between switch 182 and transformer S2. The output terminal of transformer S2 is connected to the input terminal of switch 312. The output terminal of switch 312 is connected to switch 3821. Switch 3012 is installed on the low-voltage side bus between switch 312 and switch 3821.

[0057] Switches 3742 and 3741 are installed on the inter-station line between substation C and substation E. The output terminal of switch 3812 is connected to the input terminal of switch 3742, and the output terminal of switch 3821 is connected to the input terminal of switch 3741. Switch 3741 is installed on the inter-station line between substation E and substation F.

[0058] The inter-station lines between substations A and D are equipped with switch 121, switch 131, transformer S3, switch 321, and switch 3321; the inter-station lines between substations B and D are equipped with switch 162, switch 132, transformer S4, switch 322, and switch 3322. Two busbars connect the two inter-station lines between substations A, B, and D. Switch 102 is installed on the high-voltage busbar, and switch 3013 is installed on the low-voltage busbar. The output of substation A is connected to the input of switch 121, the output of switch 121 is connected to the input of switch 131, and the output of switch 131 is connected to the input of transformer S3. Switch 102 is located on the high-voltage busbar between switch 131 and transformer S3. The output of transformer S3 is connected to the input of switch 321, and the output of switch 321 is connected to switch 3321. Switch 3013 is located on the low-voltage busbar between switch 321 and switch 3321. The output terminal of substation B is connected to the input terminal of switch 162. The output terminal of switch 162 is connected to the input terminal of switch 132. The output terminal of switch 132 is connected to the input terminal of transformer S4. Switch 102 is installed on the high-voltage side bus between switch 132 and transformer S4. The output terminal of transformer S4 is connected to the input terminal of switch 322. The output terminal of switch 322 is connected to switch 3322. Switch 3013 is installed on the low-voltage side bus between switch 322 and switch 3322.

[0059] A switch 3811 is installed on the line between substation D and substation F. The output terminal of switch 3322 is connected to the input terminal of switch 3811. Switch 3813 is installed on the line between substation E and substation F.

[0060] Substation C is equipped with a first substation self-healing device 502, substation E is equipped with a first area self-healing device 503, substation D is equipped with a second substation self-healing device 504, and substation F is equipped with a second area self-healing device 505.

[0061] See Figure 2The diagram illustrates a chain-structured distribution network with coordinated self-healing. When a line fault occurs between substation A and substation C, causing a power outage, the first substation self-healing device 502 and the first area self-healing device 503 simultaneously activate to perform self-healing operations. The first substation self-healing device 502 controls switch 181 to open and switch 101 to close. The first area self-healing device 503 controls switch 311 to open and switch 3012 to close according to the second tripping time setting. Since the second tripping time setting is coordinated with the self-healing operation time of the first substation self-healing device, the first substation self-healing device 502 completes its self-healing operation first. If the first substation self-healing device 502's self-healing operation is successful, the first area self-healing device 503 closes. If the first substation self-healing device 502's self-healing operation is unsuccessful, and the faulty line remains in a faulty state, the first area self-healing device 503 continues its self-healing operation, controlling switch 311 to open and switch 3012 to close. At this time, power is restored to both the high-voltage and low-voltage sides.

[0062] In one implementation, after detecting whether all self-healing devices in the distribution network are communicating normally, the method further includes:

[0063] When all self-healing devices are in communication failure, if there is a power failure in the inter-station line on the low-voltage side, the first area self-healing device set on the faulty low-voltage side will be activated and perform self-healing operation after a delay according to the second tripping time setting. The first station area self-healing device corresponding to the area where the faulty line is located will be shut down.

[0064] See Figure 2 The schematic diagram of the chain-structured distribution network shows that when a low-voltage side line fault causes power loss, i.e., a low-voltage side line fault between substation A and substation C, the first area self-healing device 503 is activated to perform self-healing operations. It then controls switch 311 to trip and switch 3012 to close according to the second tripping time setting. At this time, power supply to the low-voltage side is restored.

[0065] Step 102: When all self-healing devices are communicating normally, the first station area self-healing device set on the high voltage side of the fault is activated to perform self-healing operation, and the first area self-healing device corresponding to the area where the faulty line is located on the low voltage side is shut down.

[0066] If the self-healing operation of the first station area self-healing device fails, control the first area self-healing device to start the self-healing operation.

[0067] Optionally, the self-healing device in the first station area on the high-voltage side of the fault is activated to perform a self-healing operation, including:

[0068] When a fault occurs in the inter-station line on the high-voltage side, the self-healing device in the first station area on the faulty high-voltage side controls the switch on the faulty line on the high-voltage side to trip, and controls the switch on the busbar connecting the faulty line and the normal line on the high-voltage side to close.

[0069] See Figure 2 The diagram illustrates a chain-structured distribution network with coordinated self-healing. When a line fault occurs between the high-voltage sides of substations A and C, the first substation self-healing device 502 is activated to perform a self-healing operation. Control switch 181 trips, switch 101 closes, and power supply to the high-voltage side is restored. Furthermore, while performing its self-healing operation, the first substation self-healing device simultaneously sends a pause command to the first regional self-healing device 503 to prevent the first regional self-healing device from bypassing its designated level of operation.

[0070] Specifically, if any of the following occurs: the first station self-healing device fails to trip, the first station self-healing device returns to self-healing operation, or the first station self-healing device issues a closing command, the first station self-healing device will immediately withdraw the suspension command.

[0071] Optionally, if the first area self-healing device does not receive a pause command from the first station area self-healing device, it means that there is no power failure on the high-voltage side line and the fault point is below the high-voltage side main transformer. In this case, the first area self-healing device will perform a routine standby automatic transfer operation.

[0072] When the low-voltage side busbar loses power due to a fault in the high-voltage side line, the self-healing device in the first station area on the faulty high-voltage side controls the switch on the faulty line on the low-voltage side to trip, and controls the switch on the busbar connecting the faulty line and the normal line on the low-voltage side to close.

[0073] See Figure 2 The diagram shows a chain-structured distribution network with coordinated self-healing. When the low-voltage side of substation C loses power due to a line fault on the high-voltage side, the first substation self-healing device 502 is activated to perform self-healing operations. Control switch 311 trips, switch 3012 closes, and power supply to the low-voltage side is restored.

[0074] In one possible implementation, when the self-healing operation of the first station domain self-healing device fails, the first area self-healing device is controlled to start a self-healing operation, including:

[0075] The self-healing device in the first area performs a self-healing operation after a delay according to the first trip time setting.

[0076] The first tripping time setting is used to coordinate with the tripping and reclosing times of the main power supply line protection.

[0077] Optionally, when there is a fault in the inter-station line on the high-voltage side and the self-healing operation of the first station area self-healing device fails, the first station area self-healing device sends an acceleration action command to the first area self-healing device. After receiving the acceleration action command, the first area self-healing device controls the switch installed on the faulty line connected to the high-voltage line on the low-voltage side to trip, and controls the switch installed on the bus connecting the faulty line connected to the high-voltage line on the low-voltage side and the normal line to close.

[0078] See Figure 2 The diagram shows a chain-structured distribution network with coordinated self-healing. When a line fault occurs between the high-voltage side of substation A and substation C, and the self-healing operation of the first substation self-healing device 502 fails, the first area self-healing device 503 is activated and begins self-healing operation. It controls the switch 311 on the low-voltage side to trip, and the switch 3012 to close, restoring power supply to the high-voltage side.

[0079] Optionally, when the low-voltage side busbar loses power due to a high-voltage side line fault, and the self-healing operation of the first station area self-healing device fails, the first station area self-healing device sends an acceleration action command to the first area self-healing device. After receiving the acceleration action command, the first area self-healing device controls the switch installed on the faulty line connected to the low-voltage line on the low-voltage side to trip, and controls the switch installed on the normal line on the low-voltage side to close.

[0080] See Figure 2 The diagram shows a chain-structured distribution network with coordinated self-healing. When the low-voltage side of substation C loses power due to a line fault on the high-voltage side, and the self-healing operation of the first substation self-healing device 502 fails, the first area self-healing device 503 is activated and begins self-healing operation. The control switch 3742 trips, the switch 3741 closes, and the low-voltage side is restored to power supply.

[0081] In one possible implementation, when a switch on a low-voltage line connected to a high-voltage line is detected to have tripped, the station self-healing device on the high-voltage side and the area self-healing device on the low-voltage side are locked.

[0082] Optionally, when the system requires load reduction, the switch on the low-voltage line connected to the high-voltage line can be manually tripped to simultaneously lock the station self-healing device on the high-voltage side and the area self-healing device on the low-voltage side. In this case, both the high-voltage and low-voltage sides lose power.

[0083] In one possible implementation, Figure 3 A schematic diagram of the self-healing cooperative distribution network structure of the present invention is provided. The distribution network consists of different voltage levels of 110kV and 35kV. The 110kV distribution network is composed of 110kV substation G, and the 35kV distribution network is composed of the 35kV section of 110kV substation G, 35kV substation H, 35kV substation M, and 35kV substation N. Substation G adopts a three-incoming-line expanded internal bridge main connection form, and its two outgoing lines from the 35kV section of 110kV substation G form a daisy-chain ring network with 35kV substations H and N.

[0084] Substation G has three incoming lines. On the first incoming line, the output of switch 141 is connected to transformer S5. Switch 401 is located on the high-voltage busbar between switch 141 and transformer S5. The output of transformer S5 is connected to the input of switch 411. The output of switch 411 is connected to the input of switch 342. Switch 301 is located on the low-voltage busbar between switch 411 and switch 342. The output of the first incoming line is connected to the input of switch 511 in substation H and the input of switch 521 in substation N. Switch 522 of N is connected to switch 621 of substation M; on the second incoming line, the output of switch 142 is connected to the input of transformer S6, switch 402 is installed on the high-voltage side bus between switch 142 and transformer S6, the output of transformer S6 is connected to the input of switch 412, the output of switch 412 is connected to the input of switch 343, and the output of the second incoming line is connected to switch 611 of substation M; on the third incoming line, the output of switch 143 is connected to the input of transformer S7, and the output of transformer S7 is connected to switch 513.

[0085] Optionally, base stations and self-healing devices are installed in different voltage zones within the distribution network. The self-healing devices communicate with the corresponding base stations via CPE terminals, and all base stations communicate through the core network. Specifically, a third substation self-healing device 11 is installed in 110kV substation G, a third area self-healing device 21 is installed in 35kV substation H, a fourth area self-healing device 22 is installed in 35kV substation M, and a fifth area self-healing device 23 is installed in 35kV substation N.

[0086] See Figure 3 When a fault occurs in the inter-station line of substation G on the high-voltage side, the third substation self-healing device 11 is activated and performs a self-healing operation. Control switch 141 trips, switch 401 closes, and a pause command is sent to the third area self-healing device 21 and the fifth area self-healing device 23. If the self-healing operation of the second substation self-healing device fails, the pause command to the area self-healing device is revoked, and an acceleration action command is sent to the area self-healing device. Upon receiving the acceleration action command, the second area self-healing device trips control switch 411 and closes switch 301. At this time, power supply is restored to both the high-voltage and low-voltage sides.

[0087] In one possible implementation, when a switch on a low-voltage line connected to a high-voltage line is detected to have tripped, the station self-healing device on the high-voltage side and the area self-healing device on the low-voltage side are locked.

[0088] See Figure 3When the low-voltage side busbar loses power due to a high-voltage side line fault, and the self-healing operation of the third substation self-healing device 11 fails, the third substation self-healing device 11 sends an acceleration action command to the third area self-healing device 21 and the fifth area self-healing device 23. After receiving the acceleration action command, the third area self-healing device 21 and the fifth area self-healing device 23 control switch 621 to open and switch 611 to close, and power supply to substation M and substation N is restored.

[0089] See Figure 3 When a low-voltage side line fault occurs between substation G and substation N, the third zone self-healing device 11 and the fifth zone self-healing device 23 are activated to perform self-healing operations, control switches 521 and 342 are tripped, switch 611 is closed, and power supply to substations M and N is restored.

[0090] Figure 4 A flowchart of the collaborative self-healing control method for power distribution networks is presented. The detailed process can be divided into the following cases:

[0091] (1) When the self-healing device is in normal communication, if the high voltage side fails to power, the station self-healing device will start and perform self-healing operation. If the self-healing operation is successful, the power supply will be restored; if the self-healing operation is unsuccessful, an acceleration action command will be sent to the area self-healing device to start the area self-healing device to perform self-healing operation.

[0092] (2) When the self-healing device is in normal communication, the low voltage side is de-energized. At this time, the area self-healing device is activated and performs self-healing operation according to the first trip time setting.

[0093] (3) When the self-healing device is communicating normally, if the switch on the low-voltage line connected to the high-voltage line trips, the station self-healing device on the high-voltage side and the area self-healing device on the low-voltage side are locked.

[0094] (4) When the self-healing device communication is abnormal, if the high voltage side fails to power, the station self-healing device and the area self-healing device will start at the same time to perform self-healing operation. If the station self-healing device performs self-healing operation successfully, the area self-healing device will return to self-healing operation. If the station self-healing device performs self-healing operation unsuccessfully, the area self-healing device will perform self-healing operation according to the second trip time setting.

[0095] (5) When the self-healing device communication is abnormal, if the low voltage side fails to power, the area self-healing device will perform self-healing operation according to the second trip time setting.

[0096] This invention provides a method for coordinated self-healing control of a distribution network. By setting up base stations and self-healing devices in different voltage zones within the distribution network, and having the self-healing devices communicate with corresponding base stations via CPE terminals, and all base stations communicating through the core network, a network transmission mode is formed: self-healing device—CPE terminal—5G base station—core network—5G base station—CPE terminal—self-healing device. This enables end-to-end and multi-terminal data interaction between the self-healing devices. The method detects whether all self-healing devices in the distribution network are communicating normally. When all self-healing devices are communicating normally, the first substation self-healing device on the high-voltage side of the fault is activated to perform self-healing operations, while the first area self-healing device corresponding to the faulty line on the low-voltage side is shut down. If the self-healing operation of the first substation self-healing device fails, the first area self-healing device is activated to perform self-healing operations. By employing a network configuration of self-healing devices for different voltage levels, and configuring substation self-healing devices in high-voltage substations, the method optimizes the coordination of self-healing times for different voltage levels within the substation, automatically achieving rapid network reconfiguration for power restoration, and realizing high-speed coordinated self-healing control of multi-voltage level distribution networks.

[0097] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0098] The following are system embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0099] Figure 5 This diagram illustrates the structure of a distribution network collaborative self-healing control system according to an embodiment of the present invention. Base stations and self-healing devices are respectively set up in different voltage levels within the distribution network. The self-healing devices communicate with the corresponding base stations via CPE terminals, and all base stations communicate through the core network. For ease of explanation, only the parts relevant to the embodiment of the present invention are shown, and are detailed below:

[0100] like Figure 5 As shown, the power distribution network collaborative self-healing control system 500 includes: a detection device 501, a first station area self-healing device 502, and a first area self-healing device 503.

[0101] The detection device 501 is used to detect whether all self-healing devices in the power distribution network are communicating normally.

[0102] The first station area self-healing device 502 is used to start and perform self-healing operation when all self-healing devices are communicating normally, if it is set on the high voltage side of the fault, and control the first area self-healing device corresponding to the area where the faulty line on the low voltage side is located to shut down.

[0103] The first area self-healing device 503 is used to start a self-healing operation when the self-healing operation of the first station area self-healing device fails.

[0104] In one possible implementation, after the detection device 501 detects whether all self-healing devices in the distribution network are communicating normally, the first substation self-healing device 502, if installed on the high-voltage side of the fault, is activated and performs self-healing operations when all self-healing devices are communicating abnormally and when there is a power outage in the inter-substation line on the high-voltage side. Simultaneously, the first area self-healing device 503 is activated and performs self-healing operations when all self-healing devices are communicating abnormally and when there is a power outage in the inter-substation line on the high-voltage side. When the first substation self-healing device 502 successfully performs its self-healing operation, the first area self-healing device 503 is deactivated; when the first substation self-healing device 502 fails to perform its self-healing operation, the first area self-healing device 503 continues to perform its self-healing operation.

[0105] In one possible implementation, if all self-healing devices malfunction due to communication failure, and a power outage occurs on the high-voltage side inter-station line... ， The first station domain self-healing device 502 and the first area self-healing device 503 are activated simultaneously. The first station domain self-healing device 502 performs self-healing operation after a preset delay, and the first area self-healing device 503 performs self-healing operation after a delay according to the second trip time setting.

[0106] In one possible implementation, after the detection device 501 detects whether all self-healing devices in the distribution network are communicating normally, the first area self-healing device 503, when all self-healing devices are communicating abnormally, if there is a power failure in the low-voltage side inter-station line, starts and performs self-healing operation according to the second tripping time setting.

[0107] In one possible implementation, the first station self-healing device 502 is configured to, if installed on the fault high-voltage side, start when the inter-station line on the high-voltage side is faulty, perform self-healing operation, control the switch installed on the faulty line on the high-voltage side to trip, and control the switch installed on the bus connecting the faulty line and the normal line on the high-voltage side to close.

[0108] The first station domain self-healing device 502 is used to, if installed on the high-voltage side of the fault, when all self-healing devices are communicating normally, activate when the busbar on the low-voltage side loses power due to a fault on the high-voltage side, perform self-healing operation, control the switch installed on the faulty line on the low-voltage side to trip, and control the switch installed on the busbar connecting the faulty line and the normal line on the low-voltage side to close.

[0109] In one possible implementation, the first station area self-healing device 502, if installed on the high-voltage side of the fault, when all self-healing devices are communicating normally, and when the inter-station line on the high-voltage side is faulty and the self-healing operation of the first station area self-healing device 502 fails, sends an acceleration action command to the first area self-healing device 503. After receiving the acceleration action command, the first area self-healing device 503 starts, performs self-healing operation according to the first tripping time setting, and controls the switch installed on the faulty line connected to the high-voltage line on the low-voltage side to trip, and controls the switch installed on the bus connecting the faulty line connected to the high-voltage line on the low-voltage side and the normal line to close.

[0110] In one possible implementation, the first station area self-healing device 502, if installed on the high-voltage side of the fault, when all self-healing devices are communicating normally, and when the busbar on the low-voltage side loses power due to a fault on the high-voltage side line, and the self-healing operation of the first station area self-healing device 502 fails, sends an acceleration action command to the first area self-healing device 503. After receiving the acceleration action command, the first area self-healing device 503 starts, performs self-healing operation according to the first tripping time setting, and controls the switches installed on the faulty lines connected to the low-voltage lines on the low-voltage side to trip, and controls the switches installed on the normal lines on the low-voltage side to close.

[0111] In one possible implementation, when a switch on a low-voltage line connected to a high-voltage line is detected to have tripped, the station self-healing device on the high-voltage side and the area self-healing device on the low-voltage side are locked.

[0112] This invention provides a distribution network collaborative self-healing control system. By setting up base stations and self-healing devices in different voltage zones within the distribution network, with the self-healing devices communicating with corresponding base stations via CPE terminals, and all base stations communicating through the core network, a network transmission mode is formed: self-healing device—CPE terminal—5G base station—core network—5G base station—CPE terminal—self-healing device. This enables end-to-end and multi-terminal data interaction between the self-healing devices. The system detects whether all self-healing devices in the distribution network are communicating normally. When all self-healing devices are communicating normally, the first substation self-healing device on the high-voltage side of the fault is activated to perform self-healing operations, while the first area self-healing device corresponding to the faulty line on the low-voltage side is shut down. If the self-healing operation of the first substation self-healing device fails, the first area self-healing device is activated to perform self-healing operations. By employing a network configuration of self-healing devices for different voltage levels, and configuring substation self-healing devices in high-voltage substations, the system optimizes the coordination of self-healing times for different voltage levels within the substation, automatically achieving rapid network reconfiguration for power restoration, and realizing high-speed collaborative self-healing control of multi-voltage level distribution networks.

[0113] Figure 6This is a schematic diagram of a terminal provided in an embodiment of the present invention. Figure 6 As shown, the terminal 6 in this embodiment includes a processor 60, a memory 61, and a computer program 62 stored in the memory 61 and executable on the processor 60. When the processor 60 executes the computer program 62, it implements the steps described in the various embodiments of the power distribution network collaborative self-healing control method, for example... Figure 1 Steps 101 to 102 are shown. Alternatively, when processor 60 executes computer program 62, it implements the functions of each module / unit in the above-described device embodiments, for example... Figure 5 The functions of modules / units 501 to 503 shown.

[0114] For example, computer program 62 can be divided into one or more modules / units, one or more of which are stored in memory 61 and executed by processor 60 to complete the present invention. One or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of computer program 62 in terminal 6. For example, computer program 62 can be divided into... Figure 5 The modules / units shown are 501 to 503.

[0115] Terminal 6 may include, but is not limited to, a processor 60 and a memory 61. Those skilled in the art will understand that... Figure 6 This is merely an example of terminal 6 and does not constitute a limitation on terminal 6. It may include more or fewer components than shown, or combine certain components, or different components. For example, the terminal may also include input / output devices, network access devices, buses, etc.

[0116] The processor 60 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0117] The memory 61 can be an internal storage unit of the terminal 6, such as the hard disk or RAM of the terminal 6. The memory 61 can also be an external storage device of the terminal 6, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the terminal 6. Furthermore, the memory 61 can include both internal and external storage units of the terminal 6. The memory 61 is used to store computer programs and other programs and data required by the terminal. The memory 61 can also be used to temporarily store data that has been output or will be output.

[0118] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0119] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0120] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0121] In the embodiments provided by this invention, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0122] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0123] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0124] If integrated modules / units are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various power distribution network collaborative self-healing control method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0125] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for coordinated self-healing control of a power distribution network, characterized in that, In the distribution network, base stations and self-healing devices are respectively set up in different voltage areas. The self-healing devices communicate with the corresponding base stations through CPE terminals, and all base stations communicate through the core network. The distribution network coordinated self-healing control method also includes: Check whether all self-healing devices in the power distribution network are communicating normally; When all the self-healing devices are communicating normally, the first station domain self-healing device set on the high voltage side of the fault starts to perform self-healing operation, and controls the first area self-healing device corresponding to the area where the faulty line on the low voltage side is located to shut down. If the self-healing operation of the first station domain self-healing device fails, control the first area self-healing device to start the self-healing operation. When all the self-healing devices are in communication failure, if the high-voltage side inter-station line fails and loses power, the first station area self-healing device set on the high-voltage side and the first area self-healing device corresponding to the area where the low-voltage side fault line is located will be activated simultaneously and perform self-healing operation. When the self-healing operation of the first station domain self-healing device is successful, the self-healing device of the first area is turned off. If the self-healing operation of the first station domain self-healing device fails, the first area self-healing device continues to perform the self-healing operation.

2. The distribution network collaborative self-healing control method according to claim 1, characterized in that, The self-healing device in the first station area, installed on the high-voltage side of the fault, is activated to perform a self-healing operation, including: When a fault occurs in the inter-station line on the high-voltage side, the first station area self-healing device installed on the faulty high-voltage side controls the switch installed on the faulty line on the high-voltage side to trip, and controls the switch installed on the bus connecting the faulty line and the normal line on the high-voltage side to close. When the low-voltage side busbar loses power due to a fault in the high-voltage side line, the first station area self-healing device installed on the faulty high-voltage side controls the switch installed on the faulty line on the low-voltage side to trip, and controls the switch installed on the busbar connecting the faulty line and the normal line on the low-voltage side to close.

3. The distribution network collaborative self-healing control method according to claim 2, characterized in that, When the self-healing operation of the first station area self-healing device fails, the system controls the first area self-healing device to start a self-healing operation, including: When a fault occurs in the inter-station line on the high-voltage side, and the self-healing operation of the first station area self-healing device fails, the first station area self-healing device sends an acceleration action command to the first area self-healing device. After receiving the acceleration action command, the first area self-healing device controls the switch installed on the faulty line connected to the high-voltage line on the low-voltage side to trip, and controls the switch installed on the bus connecting the faulty line connected to the high-voltage line on the low-voltage side and the normal line to close.

4. The distribution network collaborative self-healing control method according to claim 2, characterized in that, When the self-healing operation of the first station area self-healing device fails, control the first area self-healing device to start a self-healing operation, including: When the low-voltage side busbar loses power due to a fault on the high-voltage side line, and the self-healing operation of the first station area self-healing device fails, the first station area self-healing device sends an acceleration action command to the first area self-healing device. After receiving the acceleration action command, the first area self-healing device controls the switch installed on the faulty line connected to the low-voltage line on the low-voltage side to trip, and controls the switch installed on the normal line on the low-voltage side to close.

5. The distribution network collaborative self-healing control method according to claim 1, characterized in that, When the self-healing operation of the first station area self-healing device fails, control the first area self-healing device to start a self-healing operation, including: When a fault occurs on the inter-station line on the high-voltage side, and the self-healing operation of the first station area self-healing device fails, the first area self-healing device is activated and self-healing operation is performed after a delay according to the first tripping time setting.

6. The distribution network cooperative self-healing control method according to any one of claims 1-5, characterized in that, Also includes: When a switch on a low-voltage line connected to a high-voltage line is detected to have tripped, the station self-healing device on the high-voltage side and the area self-healing device on the low-voltage side are locked.

7. The distribution network cooperative self-healing control method according to claim 1, characterized in that, The self-healing device in the first substation area on the high-voltage side and the self-healing device in the first area corresponding to the faulty line on the low-voltage side are activated simultaneously and perform self-healing operations, including: The first substation self-healing device set on the high-voltage side of the fault and the first area self-healing device corresponding to the area where the faulty line is located on the low-voltage side are activated simultaneously. The first substation self-healing device performs self-healing operation after a preset delay, and the first area self-healing device performs self-healing operation after a delay according to the second tripping time setting.

8. The distribution network cooperative self-healing control method according to claim 7, characterized in that, After detecting whether all self-healing devices in the power distribution network are communicating normally, the method further includes: When all the self-healing devices are in communication failure, if the low-voltage side inter-station line fails and loses power, the first area self-healing device set on the faulty low-voltage side is activated and performs self-healing operation after a delay according to the second tripping time setting value, and the first station area self-healing device corresponding to the area where the faulty line is located is shut down.

9. A terminal, comprising a memory and a processor, the memory for storing a computer program, the processor for calling and running the computer program stored in the memory, characterized in that, When the processor executes the computer program, it implements the steps of the method as described in any one of claims 1 to 8.

Images