Power distribution network exception handling method and device considering island operation, computer equipment and readable storage medium

Abstract

The invention relates to a power distribution network exception handling method and device considering island operation, computer equipment, a readable storage medium and a program product. Island division is carried out in the power distribution network through information of each controllable distributed power supply and information of each section switch in the power distribution network to form an island region, and when it is determined that the island region is in an abnormal state according to difference values between output information of each load and a main distributed power supply in the island region and a preset power target value, the power distribution network is in an abnormal state. And carrying out separation processing on the load according to the weight corresponding to the load so as to realize exception recovery. Compared with the traditional abnormal processing without considering the island operation, the scheme carries out the island region division through combining the controllable distributed power supply information and the section switch information, detects the abnormality of the island region based on the load and output information in the island region, and carries out the abnormality recovery of the island region in the power distribution network through a load separation mode. And the exception handling efficiency in the power distribution network is improved.

Description

Technical Field

[0001] The present application relates to the field of power grid technology, and in particular to a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for handling distribution network anomalies taking into account island operation. Background Art

[0002] With the development of power technology, distributed power sources have become an indispensable power source in the distribution network. In order to make the power grid more economical and environmentally friendly, the future active distribution network needs to allow the existence of island operation. When the island is running, there are distributed power sources inside the island. Therefore, timely handling of the fault of the distribution network with island operation is an important measure to ensure the normal operation of the distribution network with island operation. At present, island operation is generally not allowed in the distribution network for the sake of equipment safety operation. There is a lack of abnormal handling methods for the distribution network with island operation, which makes it impossible to handle the abnormalities of the distribution network in the case of island operation. Summary of the invention

[0003] Based on this, it is necessary to provide a distribution network abnormality handling method, device, computer equipment, computer-readable storage medium and computer program product that can take into account island operation in order to address the above technical problems.

[0004] In a first aspect, the present application provides a method for handling abnormalities in a distribution network considering island operation, the method comprising:

[0005] Obtain information about each controllable distributed power source and each segment switch in the distribution network;

[0006] According to the information of each controllable distributed power source and the information of each segment switch, an island division is performed in the distribution network to obtain an island area in the distribution network; the island area includes each distributed power source and each load; each distributed power source includes a main distributed power source;

[0007] If it is determined that the island area is in an abnormal state based on the various loads in the island area and the difference between the output information of the main distributed power source and the preset power target value, the target loads are separated according to the weights corresponding to the various loads to restore the island area from abnormality.

[0008] In one of the embodiments, performing island division in the distribution network according to the information of each controllable distributed power source and the information of each segment switch to obtain the island area in the distribution network includes:

[0009] Determining each active distribution network area in the distribution network according to each of the section switch information;

[0010] Acquire each target active distribution network area including controllable distributed power source information in each of the active distribution networks;

[0011] According to each of the target active distribution network areas, island division is performed in the distribution network to obtain island areas in the distribution network.

[0012] In one embodiment, determining each active distribution network area in the distribution network according to each of the segment switch information includes:

[0013] For each pair of the segmented switch information, obtain each distributed power source information and each load between the two segmented switch information;

[0014] An active power distribution network area is obtained according to each of the distributed power source information and each of the loads between two of the segmented switch information.

[0015] In one embodiment, performing island division in the distribution network according to each of the target active distribution network areas to obtain the island area in the distribution network includes:

[0016] For each target active distribution network area, the target active distribution network area is used as the main distributed power source, and the target segmented switch information corresponding to the outlet of the controllable distributed power source in the target active distribution network area is used as the front end point of the island boundary;

[0017] Determine feasible active distribution network areas among the adjacent active distribution network areas according to the priority and active output information of the adjacent active distribution network areas at the front end point of the isolated island boundary;

[0018] The segmented switch information corresponding to the outlet of the controllable distributed power source in the feasible active distribution network area is used as the new island boundary front end point, and the step of determining the feasible active distribution network areas in each adjacent active distribution network area according to the priority and active output information of each active distribution network area adjacent to the island boundary front end point is returned, until there is no feasible active distribution network area in each adjacent active distribution network area, and the island area is obtained according to the target active distribution network area where the main distributed power source is located and each feasible active distribution network area.

[0019] In one of the embodiments, determining feasible active distribution network areas among adjacent active distribution network areas according to the priorities and active output information of the active distribution network areas adjacent to the front end point of the island boundary includes:

[0020] Acquire each active power of each device in each adjacent active power distribution network area, and each corresponding load type;

[0021] Determining priorities corresponding to adjacent active power distribution network areas according to the active powers and the load types;

[0022] Acquire each first rated output information and each first active output information when the target active distribution network area is respectively combined with each controllable distributed power source information in each adjacent active distribution network area, and each second rated output information and each second active output information when the target active distribution network area is respectively combined with each uncontrollable distributed power source information;

[0023] The feasible active distribution network area is obtained according to the active distribution network area with the highest priority, the first active output information being smaller than the corresponding first rated output information, and the second active output information being smaller than the corresponding second rated output information.

[0024] In one embodiment, if the island area is determined to be in an abnormal state according to the loads in the island area and the difference between the output information of the main distributed power source and the preset power target value, the target loads are separated according to the weights corresponding to the loads, including:

[0025] If it is determined that the island area is in an abnormal state according to each load in the island area and the difference between the output information of the main distributed power source and the preset power target value, then each load type of each load is obtained;

[0026] Determine, according to each of the load types, each weight corresponding to each of the loads;

[0027] The target load with the lowest weight among the weights is separated.

[0028] In one embodiment, the method further comprises:

[0029] If load increase information is detected in the island area, the difference between the output information of the main distributed power source and the preset power target value is greater than the preset power threshold, and the time when the difference is greater than the preset power threshold is greater than the preset time threshold, it is determined that the island area is in an abnormal state.

[0030] In a second aspect, the present application further provides a distribution network abnormality processing device considering island operation, the device comprising:

[0031] An acquisition module is used to obtain information about each controllable distributed power source and each segment switch in the distribution network;

[0032] A partitioning module is used to perform island partitioning in the distribution network according to the information of each controllable distributed power source and the information of each segment switch, so as to obtain an island area in the distribution network; the island area includes each distributed power source and each load; each distributed power source includes a main distributed power source;

[0033] A processing module is used to separate the target loads according to the weights corresponding to the loads, if it is determined that the island area is in an abnormal state based on the loads in the island area and the difference between the output information of the main distributed power source and the preset power target value, so as to perform abnormal recovery on the island area.

[0034] In a third aspect, the present application further provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0035] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of the above method when executed by a processor.

[0036] In a fifth aspect, the present application also provides a computer program product, including a computer program, which implements the steps of the above method when executed by a processor.

[0037] The above-mentioned distribution network abnormality processing method, device, computer equipment, computer-readable storage medium and computer program product considering island operation, divide the distribution network into islands through the information of each controllable distributed power source and each segment switch in the distribution network, form an island area, and determine that the island area is in an abnormal state according to the difference between the output information of each load and the main distributed power source in the island area and the preset power target value, and then separate the load according to the weight corresponding to the load, so as to achieve abnormal recovery. Compared with the traditional abnormal processing that does not consider island operation, this scheme divides the island area by combining the controllable distributed power source information and the segment switch information, and detects the abnormality of the island area based on the load and output information in the island area, and recovers the abnormality of the island area in the distribution network by separating the load, thereby improving the efficiency of abnormal processing in the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a flowchart of a method for handling abnormalities in a distribution network considering island operation in one embodiment;

[0040] Figure 2 A schematic diagram of a step of dividing active power distribution areas in an embodiment;

[0041] Figure 3 A schematic diagram of a process of an island expansion step in one embodiment;

[0042] Figure 4 A schematic diagram of a front end point search step of an isolated island boundary in an embodiment;

[0043] Figure 5 This is a schematic diagram of the structure of an isolated island and off-grid in one embodiment;

[0044] Figure 6 A schematic diagram of a flow chart of an exception handling step in an embodiment;

[0045] Figure 7 is a schematic diagram of power fluctuation response in an isolated island in one embodiment;

[0046] Figure 8 It is a structural block diagram of a distribution network abnormality processing device considering island operation in one embodiment;

[0047] Fig. 9 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0049] In one embodiment, Figure 1 As shown, a method for handling abnormalities in a distribution network considering island operation is provided. This embodiment uses the method applied to a terminal as an example. It can be understood that the method can also be applied to a server, and can also be applied to a system including a terminal and a server, and is implemented through the interaction between the terminal and the server, including the following steps S202 to S206. Wherein:

[0050] Step S202, obtaining information of each controllable distributed power source and each segment switch in the distribution network.

[0051] Among them, the distribution network can be an important part of the power system, which is mainly responsible for distributing electric energy from the transmission network or regional power plant to various users. It consists of overhead lines, cables, towers, distribution transformers, disconnectors, reactive compensators and some ancillary facilities. The terminal can be a device for managing the distribution network. In this embodiment, there may be an island area in the distribution network. Among them, the island area is an independent power supply area formed by local isolation in the distribution network. These areas are usually powered by distributed power sources and isolated from the main power grid to form a self-sufficient power supply system. Among them, the distributed power supply includes controllable distributed power supply information and uncontrollable distributed power supply information. The controllable distributed power supply information indicates that the output power is controlled by the controller, and it independently undertakes frequency and voltage regulation work or provides certain power support in the island; the uncontrollable distributed power supply information is also called intermittent distributed power supply, which means that the output power is affected by natural factors and cannot output stable and continuous power, such as intermittent energy such as photovoltaics and wind turbines.

[0052] The distribution network also includes multiple segment switch information. Among them, the segment switch information refers to the switches set on the lines of the distribution network, which are used to divide the lines into several sections so that the fault area can be quickly located and isolated when a fault occurs. Then the terminal can obtain the information of each controllable distributed power source in the distribution network and the information of each segment switch. Among them, the controllable distributed power source information may include information such as the location and power source attributes of the controllable distributed power source in the distribution network; the segment switch information may include information such as the location and switch attributes of the segment switch in the distribution network.

[0053] Step S204, according to the information of each controllable distributed power source and each segment switch information, island division is performed in the distribution network to obtain an island area in the distribution network; the island area includes each distributed power source and each load; each distributed power source includes a main distributed power source.

[0054] In this embodiment, if an island area is allowed to exist in the distribution network, the terminal can divide the distribution network into islands to form corresponding island areas. There may be one or more island areas in the distribution network. The terminal can divide the islands in the distribution network according to the information of each controllable distributed power source and the information of each segment switch to obtain the island area in the distribution network. For example, the terminal determines each active distribution network area in the distribution network based on the segment switch information, and then the terminal performs island expansion by improving the greedy step-by-step optimization algorithm, and finally forms an island area. An island area may include each distributed power source and each corresponding load, and each distributed power source in an island area includes a main distributed power source. The load represents the equipment that needs electricity, and the main distributed power source represents the distributed power source with the largest active power in the island area.

[0055] Step S206: If the island area is determined to be in an abnormal state based on the loads in the island area and the difference between the output information of the main distributed power source and the preset power target value, the target loads are separated according to the weights corresponding to the loads to recover the island area from abnormality.

[0056] Among them, the terminal can monitor the status of each load in the isolated island area and monitor the output information of the main distributed power source in the isolated island area. The terminal compares the output information of the above-mentioned main distributed power source with the preset power target value. If the terminal determines that the isolated island area is in an abnormal state based on the various loads in the isolated island area and the difference between the output information of the main distributed power source and the preset power target value, for example, the output of the distributed power source in the isolated island area is too large to form an abnormality, then the terminal can perform abnormal recovery processing on the isolated island area. For example, the terminal can separate the target loads according to the weights corresponding to the loads, and prioritize the separation of loads with lower weights to perform abnormal recovery on the isolated island area.

[0057] In the above-mentioned distribution network abnormality handling method considering island operation, the distribution network is divided into islands through the information of each controllable distributed power source and each segment switch in the distribution network to form an island area. When the island area is in an abnormal state, it is determined according to the difference between the output information of each load and the main distributed power source in the island area and the preset power target value, and the load is separated according to the weight corresponding to the load, so as to achieve abnormal recovery. Compared with the traditional abnormality handling that does not consider island operation, this scheme divides the island area by combining the controllable distributed power source information and the segment switch information, and detects the abnormality of the island area based on the load and output information in the island area, and recovers the abnormality of the island area in the distribution network by separating the load, thereby improving the efficiency of abnormality handling in the distribution network.

[0058] In one embodiment, according to the information of each controllable distributed power source and each segmented switch information, island division is performed in the distribution network to obtain the island area in the distribution network, including: determining each active distribution network area in the distribution network according to the information of each segmented switch; obtaining each target active distribution network area including the controllable distributed power source information in each active distribution network; according to each target active distribution network area, island division is performed in the distribution network to obtain the island area in the distribution network.

[0059] In this embodiment, the distribution network may include multiple segment switches, and the terminal may first divide the active distribution network area. For example, the terminal determines each active distribution network area in the distribution network according to the information of each segment switch. Among them, the terminal may use the area between each segment switch corresponding to the information of two adjacent segment switches as each active distribution network area.

[0060] In one embodiment, each active distribution network area in the distribution network is determined based on each segment switch information, including: for every two segment switch information, obtaining each distributed power source information and each load between the two segment switch information; according to each distributed power source information and each load between the two segment switch information, obtaining the active distribution network area.

[0061] In this embodiment, when the terminal divides the active distribution network area, it can divide it by detecting the location of the segment switch and other information. The above-mentioned distribution network may include multiple segment switches. For every two segment switch information, the terminal can obtain the information of each device between the two segment switch information, including each distributed power source information and each load, so that the terminal can obtain the active distribution network area according to each distributed power source information and each load between the two segment switch information.

[0062] Specifically, Figure 2 As shown, Figure 2 The figure is a schematic diagram of the steps of dividing the active power distribution area in an embodiment. To simplify the search for the island area, the terminal can divide the active power distribution network area in advance. Among them, the section switches on the distribution network line can be regarded as one area. And each active power distribution network area has a corresponding priority.

[0063] Among them, the above-mentioned active distribution network area may include different types of distributed power sources, including controllable distributed power sources and uncontrollable distributed power sources, etc. The terminal can obtain each active distribution network area including controllable distributed power source information in each active distribution network as each target active distribution network area. When performing island division, the terminal can perform island division in the distribution network based on each target active distribution network area to obtain the island area in the distribution network. For example, the terminal performs island expansion based on each target active distribution network area to form a corresponding island area. Among them, there can be one or more island areas in the distribution network.

[0064] Through the above embodiments, the terminal can use the segmented switch information to divide the active distribution network area, and use the first active distribution network with controllable distributed power sources to divide the island, so that the terminal can realize distribution network abnormality processing based on the island area, thereby improving the efficiency of abnormal processing in the distribution network.

[0065] In one embodiment, according to each target active distribution network area, an island division is performed in the distribution network to obtain an island area in the distribution network, including: for each target active distribution network area, a controllable distributed power supply in the target active distribution network area is used as a main distributed power supply, and the target segmented switch information corresponding to the outlet of the controllable distributed power supply in the target active distribution network area is used as an island boundary front end point; according to the priority and active output information of each active distribution network area adjacent to the island boundary front end point, a feasible active distribution network area in each adjacent active distribution network area is determined; the segmented switch information corresponding to the outlet of the controllable distributed power supply in the feasible active distribution network area is used as a new island boundary front end point, and the step of determining the feasible active distribution network area in each adjacent active distribution network area according to the priority and active output information of each active distribution network area adjacent to the island boundary front end point is returned, until there is no feasible active distribution network area in each adjacent active distribution network area, and the island area is obtained according to the target active distribution network area where the main distributed power supply is located and each feasible active distribution network area.

[0066] In this embodiment, the terminal can expand and divide the island area based on the target active distribution network area. The target active distribution network area includes controllable distributed power sources, so that when the distribution network fails, the controllable distributed power sources in the target active distribution network area are used as the main distributed power sources, and the equipment operation in the island area can continue to be maintained. The terminal can ensure the power supply of important loads on the basis of maximizing the use of distributed power generation based on the step-by-step optimization strategy of the improved greedy method, reduce the number of unnecessary islands, and facilitate the reconnection of islands.

[0067] For example, for each target active distribution network area, the terminal can use the controllable distributed power source in the target active distribution network area as the main distributed power source, and use the target segmented switch information corresponding to the outlet of the controllable distributed power source in the target active distribution network area as the IBF (Islanding Boundary Frontier). Among them, IBF refers to the physical or logical dividing point between the island area and the main grid in the island operation mode of the distribution network. It marks the outermost boundary of the island area, that is, when a grid failure or power outage occurs, the power supply in the island area can be disconnected from the external grid while maintaining the independent operation of the area.

[0068] The terminal can obtain the priority and active output information of each active distribution network area adjacent to the front end point of the island boundary, so that the terminal can determine the feasible active distribution network area among the adjacent active distribution network areas according to the above priority and active output information. Among them, the feasible active distribution network area represents the active distribution network area that can be added to the island corresponding to the above target active distribution network area.

[0069] After the terminal determines the feasible active distribution network area, the segmented switch information corresponding to the outlet of the controllable distributed power source in the feasible active distribution network area can be used as the new island boundary front end point, and the priority and active output information of each active distribution network area adjacent to the island boundary front end point are returned to determine the steps of the feasible active distribution network area in each adjacent active distribution network area, and the next step of expansion is performed until there is no feasible active distribution network area in each adjacent active distribution network area. The terminal can determine each feasible active distribution network area currently added to the island corresponding to the target active distribution network area, so that the terminal can obtain the island area according to the target active distribution network area where the main distributed power source is located and each feasible active distribution network area. Among them, the controllable distributed power source in the above-mentioned target active distribution network can be used as the main distributed power source in the island area to provide the main output for the island area. Among them, when the terminal is performing island expansion, it can determine the priority based on the active power and load type of the active distribution network area, and combine the priority and the power output constraints of the target active distribution network area and each adjacent active distribution network area to determine whether there is a feasible active distribution network area.

[0070] In one embodiment, according to the priority and active output information of each active distribution network area adjacent to the front end point of the island boundary, the feasible active distribution network area in each adjacent active distribution network area is determined, including: obtaining each active power of each device in each adjacent active distribution network area, and each corresponding load type; determining each priority corresponding to each adjacent active distribution network area according to each active power and each load type; obtaining each first rated output information and each first active output information when the target active distribution network area is respectively combined with each controllable distributed power source information in each adjacent active distribution network area, and each second rated output information and each second active output information when combined with each uncontrollable distributed power source information; according to the active distribution network area with the maximum priority, the first active output information is less than the corresponding first rated output information, and the second active output information is less than the corresponding second rated output information, the feasible active distribution network area is obtained.

[0071] In this embodiment, the terminal can determine the priorities of each adjacent active distribution network area. For example, the terminal can obtain the active power of each device in each adjacent active distribution network area, and the corresponding load types. Thus, the terminal can determine the priorities corresponding to each adjacent active distribution network area according to the active power and the load type.

[0072] The terminal can also determine whether a preset constraint condition is met if a certain active distribution network area joins the island where the target active distribution network area is located, thereby determining whether the active distribution network area can join the island where the target active distribution network area is located. Among them, the constraint conditions include power output limit, load importance, weight area priority and power balance, etc. The terminal can obtain the first rated output information and the first active output information of the target active distribution network area when it is combined with the information of each controllable distributed power source in each adjacent active distribution network area, as well as the second rated output information and the second active output information when it is combined with each uncontrollable distributed power source information. That is, the terminal combines the target active distribution network area with each adjacent active distribution network area, and obtains the first rated output information and the first active output information of each island area formed at this time. Among them, the first rated output information indicates the maximum output information that the controllable distributed power source in the isolated island area formed at this time can theoretically reach, and the first active output information indicates the active output information actually generated by the controllable distributed power source at this time; the second rated output information indicates the maximum output information that the uncontrollable distributed power source in the isolated island area formed at this time can theoretically reach, and the second active output information indicates the active output information actually generated by the uncontrollable distributed power source at this time. That is, the above-mentioned rated output information can be used as constraints for power output limitation and power balance.

[0073] The terminal can obtain the active distribution network area with the highest priority and the first active output information less than the corresponding first rated output information, and the second active output information less than the corresponding second rated output information among the above-mentioned adjacent active distribution network areas as a feasible active distribution network area.

[0074] Specifically, Figure 3 As shown, Figure 3 The terminal can use the controllable distributed power source in the target active distribution network area as the island main power source, and use the export switch of the island main power source as the search starting point, with each search step length being one area.

[0075] Among them, Figure 4 As shown, Figure 4 Schematic diagram of an island boundary front end point search step in an embodiment. The boundary marker of the island area can be called the island boundary front end point. When there is more than one island boundary front end point, the terminal determines a new island search direction by calculating the regional priority.

[0076] When performing island search and expansion, the terminal may include the following steps:

[0077] Step 1: The terminal marks the IBF at each controllable distributed power export switch, adds it to the queue, traverses all IBFs in the queue, and each IBF performs "island expansion" with the region as the step unit.

[0078] Step 2: The terminal checks the constraints. For example, the terminal adds each IBF to the area it is about to enter and performs constraint checks. IBFs that do not meet the constraints are removed from the queue.

[0079] Step 3: The terminal determines whether there is still a feasible IBF in the queue. If so, it proceeds to step 4; if not, it proceeds to step 8 to end the algorithm.

[0080] Step 4: The terminal determines whether there are multiple IBFs about to enter the same active distribution network area. If so, it means that multiple islands are merged and a main power source needs to be selected from the power sources of these multiple islands. The terminal then proceeds to step 5; if not, it proceeds to step 6.

[0081] Step 5: The terminal establishes a new island main power source. For example, the terminal compares the maximum active power of the current main power sources of these IBFs, and selects the one with the largest power as the new island main power source, and removes the remaining IBFs from the queue.

[0082] Step 6: The terminal may determine the island search direction according to the priority. For example, the terminal calculates and compares the priority of the next region of the currently feasible IBF, and selects the IBF region with the highest priority as the island expansion direction.

[0083] Step 7: The terminal can also update the constraints. The IBF moves one step according to the determined island search direction, adding the area it is currently entering to the island area, and updates all constraints, including power output limit, load importance, weighted area priority, and power balance.

[0084] Step 8: End the calculation and exit the algorithm.

[0085] The above constraints can be determined based on the distributed power model. The terminal can determine the power output limit and power balance information based on the distributed power model, and determine the load importance and weight area priority based on the active power and load type. The terminal can establish a distributed power model in the island, which can be specifically expressed as:

[0086]

[0087] Among them, P d.max (T) is the maximum active output of the controllable distributed power source at time T; P output (T) is the predicted active power value of the intermittent distributed power source at time T; F cis the set of controllable distributed power sources in the target island; F I It is the collection of intermittent energy sources within the target island.

[0088] Among them, the above P output The value of (T) can be given by prediction, and then the corresponding second rated output information can be obtained, but for P d.max The value of (T), i.e. the first rated output information, needs to be calculated according to the current constraints. Taking energy storage as an example, its maximum active output P at time T is B.max (T) can be expressed as:

[0089]

[0090] Among them, P Br is the rated maximum charge and discharge power of the energy storage; ΔT is the charge and discharge time interval; η is the discharge efficiency of the energy storage; E B is the rated capacity of energy storage; SOC(T) is the percentage of remaining energy storage capacity; SOCmin is the minimum energy storage capacity to avoid equipment damage; the current value of SOC(T) can be expressed as:

[0091] .

[0092] The terminal can also set weights for loads according to different load types and importance, which can be specifically expressed as: R lv ={0.1, lv=1; 0.5, lv=2; 1, lv=3}. Among them, the weight R lv As the load importance lv increases, it increases. The first-level load (lv=1) represents unimportant loads, such as controllable flexible loads; the second-level load (lv=2) represents basic loads, such as residential electricity; the third-level load (lv=3) represents important loads, such as industrial and commercial electricity. The priority of the active distribution network area can be expressed as: ; Among them, S RL Indicates the importance of the region, S RL The larger the value, the higher the priority of the area; Li Indicates the active power of the equipment in the area. The active power value of the distributed power source is negative. L It is the collection of all devices in the area.

[0093] After the above-mentioned island area is formed, it can be connected to and disconnected from the main grid by connecting to and disconnecting from the grid. During the grid-connected stage, the voltage and frequency control of the distributed power source are provided by the main grid, and the distributed power source operates at constant power to provide fixed active and reactive outputs; during island operation, since the distributed power source is disconnected from the main grid, in order to adjust the frequency and power supply in the island to maintain stability, the distributed power source can no longer be controlled at constant power and must have voltage and frequency tracking functions. Figure 5 As shown, Figure 5 The schematic diagram of the structure of an isolated island and off-grid in one embodiment is shown in FIG.

[0094] During the off-grid stage, the master station sends a switch opening command to the FA (Feeder Automation) controller, and sends an off-grid signal to the DG control management unit of the DG (Distributed Generation); after receiving the switch opening command, the FA controller controls the island boundary switch to disconnect, and the island boundary can be the segmented switch of the IBF determined above, and returns the switch opening feedback signal to the DG control management unit; after receiving the off-grid signal, the DG control management unit waits for the switch opening feedback signal. After receiving the switch feedback signal, the island main power supply switches from the PQ control mode to the V / F control mode, and at the same time feedbacks that the master station has entered the island mode. Among them, PQ control refers to controlling the output of the power grid or generator set by adjusting the active power (P) and reactive power (Q) to meet specific power needs. V / F control refers to the regulation of the power system by adjusting the voltage (V) and frequency (F).

[0095] During the grid-connected stage, the master station sends a switch closing command to the FA controller and a grid-connected signal to the DG control management unit at the same time. After receiving the switch closing command, the FA controller collects the voltage and frequency on both sides of the switch for synchronization check. After the synchronization conditions are met, the FA controller controls the switch to close and returns the switch closing feedback signal to the DG control management unit. After receiving the grid-connected signal, the DG control management unit waits for the switch closing feedback signal. After receiving the switch feedback signal, the island main power supply switches from the V / F control mode to the PQ control mode, and at the same time feedbacks that the master station island is successfully connected to the grid.

[0096] Through the above embodiments, the terminal can use the front-end point of the island boundary, priority and output constraint conditions to expand and divide the island area, reduce unnecessary islands, and thus improve the efficiency of island exception processing in the distribution network when processing island exceptions.

[0097] In one embodiment, if the island area is determined to be in an abnormal state based on the various loads in the island area and the difference between the output information of the main distributed power source and the preset power target value, the target loads are separated according to the weights corresponding to the various loads, including: if the island area is determined to be in an abnormal state based on the various loads in the island area and the difference between the output information of the main distributed power source and the preset power target value, the load types of the various loads are obtained; the weights corresponding to the various loads are determined according to the various load types; and the target load with the lowest weight among the various weights is separated.

[0098] In this embodiment, the terminal can perform abnormality detection based on the output information of the main distributed power source in the isolated island, and perform abnormal recovery in combination with the priority of the load. The terminal can perform abnormality detection inside the isolated island area divided above.

[0099] In one embodiment, it also includes: if load increase information is detected in the island area, the difference between the output information of the main distributed power source and the preset power target value is greater than the preset power threshold and the time when the difference is greater than the preset power threshold is greater than the preset time threshold, then it is determined that the island area is in an abnormal state.

[0100] In this embodiment, the terminal can detect whether the load in the island area increases and the real-time output information of the main distributed power source. If the terminal detects the load increase information in the island area, that is, there is a greater power demand in the island area, and detects that the difference between the output information of the main distributed power source and the preset power target value is greater than the preset power threshold and the time when the difference is greater than the preset power threshold is greater than the preset time threshold, indicating that the output of the above-mentioned main distributed power source deviates from its power target value for a long time, then the terminal can determine that the island area is in an abnormal state.

[0101] If the terminal determines that the island area is in an abnormal state based on the various loads in the island area and the difference between the output information of the main distributed power source and the preset power target value, the terminal can obtain the various load types of each load. The terminal can determine the various weights corresponding to each load based on the various load types. The terminal can determine the load with the lowest weight as the target load based on the various weights, so that the terminal separates the target load with the lowest weight among the various weights. That is, the terminal separates the target load from the above-mentioned island area to reduce the output pressure in the island area.

[0102] Specifically, in order to make full use of the controllable distributed power sources and flexible load resources in the island, assist the island main power supply to smooth the random power fluctuations in the island, and increase the maximum active output margin of the island main power supply, the terminal can actively optimize the island operation of the distribution network. Figure 6 As shown, Figure 6 The flowchart of the abnormality handling step in one embodiment is shown in FIG. The island decision system in the terminal collects the output P_mea and load L_mea of ​​the distributed power source in the island area in real time, calculates the power balance, and sends the power target value, i.e., the above-mentioned preset power target value, to the collaborative interactive controller in the terminal and the load optimization control system in the terminal according to the output status of the main distributed power source in the current island.

[0103] The terminal redistributes the power output value Pi (i=1…n) of each controllable distributed power source in the island according to the above power target value P_obj through the collaborative interactive controller, and the terminal decides whether to adjust the total flexible load active value by opening and closing the switch state Si (i=1…n) of each flexible load under it according to the target value L_obj through the load optimization control system. Among them, the collaborative interactive controller adopts a fixed exchange power mode in the island state, and P_obj is the FCE (feeder control error) target value at the island main power outlet issued by the island decision system. Therefore, when the terminal detects that the active power output of the main distributed power source in the island area exceeds a certain limit, such as exceeding the above preset power target value, other controllable distributed power sources in the island will adjust their output to return the power of the island main power source to the target state.

[0104] Through the above embodiments, the terminal can determine whether an abnormality occurs inside the island area based on the processing information and load increase information of the main distributed power supply in the island area, and perform abnormal recovery according to the load type, thereby improving the efficiency of abnormal recovery in the island area in the distribution network.

[0105] In an exemplary embodiment, an application embodiment is provided, and the application embodiment is implemented by the steps of the above method. Figure 7 As shown, Figure 7 Schematic diagram of power fluctuation response in an isolated island in one embodiment. In this embodiment, taking the existence of trigeneration (P_CCHP), energy storage (P_BESS) and flexible load (P_FL) in the isolated island area as an example, Figure 7 The power response of the trigeneration (P_CCHP), energy storage (P_BESS) and flexible load (P_FL) in the island to load fluctuations is shown, where the trigeneration is the main power source of the island. At time 698s, the load increased by 70kW, and the trigeneration unit first responded and increased its output to 370kW. After 6s, the energy storage increased from the active discharge state of 45kW to 100kW, and the output of the trigeneration unit therefore dropped to 315kW. At time 713s, the island reached a new balance. At time 765s, the active output of the intermittent power supply decreased by 48kW, and the output of the trigeneration unit increased again to 362kW. At this time, because the energy storage had reached its upper limit, there were no controllable distributed resources available in the island. The terminal detected through the island operation decision system that the trigeneration output had deviated from its power target value (300kW) for a long time, and sent a new flexible load power target value to the load control system. At time 792s, the 46kW load was removed. After 10s, the trigeneration output stabilized at around 316kW, and the island reached a new balance.

[0106] Through the above embodiments, the island area is divided by combining the controllable distributed power supply information and the segmented switch information, and the anomaly of the island area is detected based on the load and output information in the island area. The anomaly recovery of the island area in the distribution network is performed by separating the load, thereby improving the efficiency of anomaly handling in the distribution network and realizing self-healing of faults in the island area of ​​the distribution network.

[0107] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0108] Based on the same inventive concept, the embodiment of the present application also provides a distribution network abnormality processing device considering island operation for implementing the distribution network abnormality processing method considering island operation involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more embodiments of the distribution network abnormality processing device considering island operation provided below can refer to the limitations of the distribution network abnormality processing method considering island operation above, and will not be repeated here.

[0109] In an exemplary embodiment, Figure 8 As shown, a distribution network abnormality processing device considering island operation is provided, including: an acquisition module 500, a division module 502 and a processing module 504, wherein:

[0110] The acquisition module 500 is used to acquire information of each controllable distributed power source and each segment switch in the distribution network.

[0111] The division module 502 is used to divide the distribution network into islands according to the information of each controllable distributed power source and each segment switch information to obtain the island area in the distribution network; the island area includes each distributed power source and each load; each distributed power source includes the main distributed power source.

[0112] Processing module 504 is used to separate the target loads according to the weights corresponding to the loads in the island area, if it is determined that the island area is in an abnormal state based on the difference between the output information of the main distributed power source and the preset power target value, so as to recover the island area from abnormality.

[0113] In one embodiment, the above-mentioned division module 502 is used to determine each active distribution network area in the distribution network according to each segment switch information; obtain each target active distribution network area including controllable distributed power source information in each active distribution network; and perform island division in the distribution network according to each target active distribution network area to obtain the island area in the distribution network.

[0114] In one embodiment, the division module 502 is used to obtain each distributed power source information and each load between two segment switch information for each two segment switch information; and obtain the active distribution network area according to each distributed power source information and each load between the two segment switch information.

[0115] In one embodiment, the above-mentioned division module 502 is used to, for each target active distribution network area, take the target active distribution network area as the main distributed power source, and take the target segmented switch information corresponding to the outlet of the controllable distributed power source in the target active distribution network area as the front end point of the island boundary; determine the feasible active distribution network area in each adjacent active distribution network area according to the priority and active output information of each active distribution network area adjacent to the front end point of the island boundary; take the segmented switch information corresponding to the outlet of the controllable distributed power source in the feasible active distribution network area as the new front end point of the island boundary, and return to the step of determining the feasible active distribution network area in each adjacent active distribution network area according to the priority and active output information of each active distribution network area adjacent to the front end point of the island boundary, until there is no feasible active distribution network area in each adjacent active distribution network area, and obtain the island area according to the target active distribution network area where the main distributed power source is located and each feasible active distribution network area.

[0116] In one embodiment, the above-mentioned division module 502 is used to obtain the active power of each device in each adjacent active distribution network area, and the corresponding load types; determine the priorities corresponding to each adjacent active distribution network area according to the active power and the load type; obtain the first rated output information and the first active output information of the target active distribution network area when combined with the controllable distributed power source information in each adjacent active distribution network area, and the second rated output information and the second active output information when combined with the non-controllable distributed power source information; obtain the feasible active distribution network area according to the active distribution network area with the highest priority, the first active output information less than the corresponding first rated output information, and the second active output information less than the corresponding second rated output information.

[0117] In one embodiment, the processing module 504 is used to obtain the load types of each load if it is determined that the island area is in an abnormal state based on the loads in the island area and the difference between the output information of the main distributed power source and the preset power target value; determine the weights corresponding to each load based on the load types; and separate the target load with the lowest weight among the weights.

[0118] In one embodiment, the above-mentioned device also includes: an identification module, which is used to determine that the island area is in an abnormal state if the load increase information in the island area is detected, the difference between the output information of the main distributed power source and the preset power target value is greater than the preset power threshold and the time when the difference is greater than the preset power threshold is greater than the preset time threshold.

[0119] Each module in the above-mentioned distribution network abnormality processing device considering island operation can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0120] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Fig. 9As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, near field communication (NFC) or other technologies. When the computer program is executed by the processor, a distribution network abnormality processing method considering island operation is implemented. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0121] Those skilled in the art will understand that Fig. 9 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0122] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the above-mentioned distribution network abnormality processing method considering island operation is implemented.

[0123] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned distribution network abnormality processing method considering island operation is implemented.

[0124] In one embodiment, a computer program product is provided, including a computer program, which, when executed by a processor, implements the above-mentioned distribution network abnormality processing method considering island operation.

[0125] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0126] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0127] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0128] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A distribution network abnormality processing method considering island operation, characterized in that: The method comprises: Obtain information about each controllable distributed power source and each segment switch in the distribution network; According to the information of each controllable distributed power source and the information of each segment switch, an island division is performed in the distribution network to obtain an island area in the distribution network; the island area includes each distributed power source and each load; each distributed power source includes a main distributed power source; If it is determined that the island area is in an abnormal state based on the various loads in the island area and the difference between the output information of the main distributed power source and the preset power target value, the target loads are separated according to the weights corresponding to the various loads to restore the island area from abnormality.

2. The method according to claim 1, characterized in that The performing of island division in the distribution network according to the information of each controllable distributed power source and the information of each segment switch to obtain an island area in the distribution network includes: Determining each active distribution network area in the distribution network according to each of the section switch information; Acquire each target active distribution network area including controllable distributed power source information in each of the active distribution networks; According to each of the target active distribution network areas, island division is performed in the distribution network to obtain island areas in the distribution network.

3. The method according to claim 2, characterized in that Determining each active distribution network area in the distribution network according to each of the segment switch information includes: For each pair of the segmented switch information, obtain each distributed power source information and each load between the two segmented switch information; An active power distribution network area is obtained according to each of the distributed power source information and each of the loads between two of the segmented switch information.

4. The method according to claim 2, characterized in that: The performing of island division in the distribution network according to each of the target active distribution network areas to obtain the island area in the distribution network includes: For each target active distribution network area, the target active distribution network area is used as the main distributed power source, and the target segmented switch information corresponding to the outlet of the controllable distributed power source in the target active distribution network area is used as the front end point of the island boundary; Determine feasible active distribution network areas among the adjacent active distribution network areas according to the priority and active output information of the adjacent active distribution network areas at the front end point of the isolated island boundary; The segmented switch information corresponding to the outlet of the controllable distributed power source in the feasible active distribution network area is used as the new island boundary front end point, and the step of determining the feasible active distribution network areas in each adjacent active distribution network area according to the priority and active output information of each active distribution network area adjacent to the island boundary front end point is returned, until there is no feasible active distribution network area in each adjacent active distribution network area, and the island area is obtained according to the target active distribution network area where the main distributed power source is located and each feasible active distribution network area.

5. The method according to claim 4, characterized in that The step of determining feasible active distribution network areas among adjacent active distribution network areas according to the priorities and active output information of the adjacent active distribution network areas at the front end point of the isolated island boundary comprises: Acquire each active power of each device in each adjacent active power distribution network area, and each corresponding load type; Determining priorities corresponding to adjacent active power distribution network areas according to the active powers and the load types; Acquire each first rated output information and each first active output information when the target active distribution network area is respectively combined with each controllable distributed power source information in each adjacent active distribution network area, and each second rated output information and each second active output information when the target active distribution network area is respectively combined with each uncontrollable distributed power source information; The feasible active distribution network area is obtained according to the active distribution network area with the highest priority, the first active output information being smaller than the corresponding first rated output information, and the second active output information being smaller than the corresponding second rated output information.

6. The method according to claim 1, characterized in that If it is determined that the island area is in an abnormal state according to each load in the island area and the difference between the output information of the main distributed power source and the preset power target value, the target load is separated according to each weight corresponding to each load, including: If it is determined that the island area is in an abnormal state according to each load in the island area and the difference between the output information of the main distributed power source and the preset power target value, then each load type of each load is obtained; Determine, according to each of the load types, each weight corresponding to each of the loads; The target load with the lowest weight among the weights is separated.

7. The method according to any one of claims 1 to 6, characterized in that: The method further comprises: If load increase information is detected in the island area, the difference between the output information of the main distributed power source and the preset power target value is greater than the preset power threshold, and the time when the difference is greater than the preset power threshold is greater than the preset time threshold, it is determined that the island area is in an abnormal state.

8. A distribution network abnormality processing device considering island operation, characterized in that: The device comprises: An acquisition module is used to obtain information about each controllable distributed power source and each segment switch in the distribution network; A partitioning module is used to perform island partitioning in the distribution network according to the information of each controllable distributed power source and the information of each segment switch, so as to obtain an island area in the distribution network; the island area includes each distributed power source and each load; each distributed power source includes a main distributed power source; A processing module is used to separate the target loads according to the weights corresponding to the loads, if it is determined that the island area is in an abnormal state based on the loads in the island area and the difference between the output information of the main distributed power source and the preset power target value, so as to perform abnormal recovery on the island area.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

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

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