Method, device and equipment for determining reactive power supporting capability of power distribution network and medium

Abstract

The invention provides a method, a device and equipment for determining the reactive power supporting capability of a power distribution network, and a medium. The method comprises the following steps: acquiring a reactive resource set (including all reactive resources of a target feeder line in the power distribution network), determining a first index value of each reactive resource, acquiring power flow distribution data corresponding to the first reactive resource with the maximum first index value, and determining a second index value of the target feeder line according to the data; if the power flow distribution data meets the preset condition and the second index value is within the preset range, updating an accumulated value of the reactive power change amplitude at the gateway equipment according to the power flow distribution data; and deleting the first reactive power resource from the reactive power resource set, repeating the steps until a preset stop condition (at least including that the reactive power resource set is empty) is met, and determining reactive power which can be provided by the power distribution network to the main power grid according to an accumulated value of the variation amplitude at the moment. The reactive power demand of the power distribution network is considered when the reactive power support capability of the power distribution network is determined, and the phenomenon of overestimation of the reactive power support capability of the power distribution network to the main power grid can be avoided.

Description

Technical Field

[0001] The present application relates to the field of power technologies, and in particular, to a method, device, equipment, and medium for determining the reactive power support capacity of a distribution network. Background Art

[0002] The stable operation of the power grid highly depends on the reactive power support capacity of the distribution network for the main power grid. When evaluating the reactive power support capacity of the distribution network for the main power grid, in related technologies, a method for evaluating the reactive power support capacity of the distribution network is provided. This method starts from the perspective of the main power grid, regards the distribution network as an adjustable resource, and evaluates its overall adjustability. When the distribution network faces voltage fluctuations, according to the voltage reactive power control principle of "hierarchical and zonal, local balance", this method preferentially schedules the reactive power sources adjacent to the voltage over-limit nodes for compensation. However, this evaluation method ignores the demand for the adjustment capacity margin of the distribution network itself as a lower-level power grid, resulting in an overestimation of the reactive power support capacity of the distribution network for the main power grid and a reduction in the reliability of the power grid operation. Summary of the Invention

[0003] The present application provides a method, device, equipment, and medium for determining the reactive power support capacity of a distribution network, so as to solve the defect in the prior art that the reactive power demand of the distribution network itself as a lower-level power grid is not considered, thereby overestimating the reactive power support capacity of the distribution network for the main power grid, and effectively improving the reliability of the power grid operation.

[0004] The present application provides a method, device, equipment, and medium for determining the reactive power support capacity of a distribution network, including the following steps: Obtain a reactive power resource set, where the reactive power resource set includes all reactive power resources on a target feeder in the distribution network, the target feeder is a distribution line connecting the distribution network to the low-voltage side of the main power grid, and the reactive power resources are used to provide reactive power to the distribution network; Determine the first index value of each reactive power resource in the reactive power resource set, and determine the reactive power resource with the largest first index value as the first reactive power resource, where the first index value represents the ability of the reactive power resource to adjust the voltage distribution in the distribution network; Obtain the power flow distribution data corresponding to the first reactive power resource, and determine the second index value of the target feeder according to the power flow distribution data. The power flow distribution data is obtained by performing a power flow calculation on the distribution network after the output value of the reactive power of the first reactive power resource is adjusted, and the second index value represents the ability of the target feeder to adjust the voltage fluctuation in the distribution network after the output value of the reactive power of the first reactive power resource is adjusted; If the power flow distribution data meets the preset conditions and the second index value is within the preset range, update the cumulative value of the reactive power change amplitude at the gateway device on the target feeder according to the power flow distribution data, where the gateway device is located at the physical connection between the main power grid and the distribution network; Delete the first reactive power resource from the reactive power resource set, and determine an update condition according to the output value of the reactive power of the first reactive power resource in the power flow distribution data, where the update condition is used to determine the new first index value and the new power flow distribution data; Repeat the above steps until the preset stop condition is met. The preset stop condition is any one of the following: the reactive power resource set is an empty set, the power flow distribution data corresponding to all remaining reactive power resources does not meet the preset conditions, and the second index value is not within the preset range; When the preset stop condition is met, determine the reactive power that the distribution network can provide to the main power grid according to the cumulative value of the reactive power change amplitude. According to a method for determining the reactive power support capacity of a distribution network provided by the present application, after determining the second index value of the target feeder according to the power flow distribution data and before deleting the first reactive power resource from the reactive power resource set, the method further includes: If the power flow distribution data does not meet the preset conditions, or the second index value is not within the preset range, sequentially read each reactive power resource in the reactive power resource set sorted in descending order according to the first index value and make a judgment until a new first reactive power resource is obtained; Wherein, the power flow distribution data corresponding to the new first reactive power resource meets the preset conditions, and the second index value corresponding to the new first reactive power resource is within the preset range.

[0005] According to a method for determining the reactive power support capacity of a distribution network provided by the present application, the reactive power resource set includes a second reactive power resource, and the second reactive power resource is any reactive power resource in the reactive power resource set; determining the first index value of each reactive power resource in the reactive power resource set includes: Obtain the voltage values of each preset node in the power flow distribution data corresponding to the second reactive power resource. The power flow distribution data corresponding to the second reactive power resource is obtained by performing a power flow calculation on the distribution network after adjusting the output value of the reactive power of the second reactive power resource. The preset nodes include any one of the bifurcation points of the target feeder and the branch and the points where power injection exists on the target feeder; According to the voltage values of each preset node, determine a third index value corresponding to the second reactive power resource, where the third index value represents the ability of the second reactive power resource to regulate the voltage distribution in the distribution network; Determine the difference between the third index value and the initial value corresponding to the third index value as the first index value corresponding to the second reactive power resource.

[0006] According to a method for determining the reactive power support capacity of a distribution network provided by the present application, the determining the third index value corresponding to the second reactive power resource according to the voltage values of the respective preset nodes includes: According to the voltage values of the respective preset nodes, determine the third index value corresponding to the second reactive power resource through the following formula (1): (1) Wherein, represents the serial number of the second reactive power resource in the reactive power resource set, represents the third index value corresponding to the second reactive power resource, represents the number of preset nodes, represents the voltage value of the preset node after the output value of the reactive power adjusted by the second reactive power resource, represents the preset node 's maximum qualified voltage, represents the preset node 's minimum qualified voltage, represents the average voltage value of all preset nodes after the output value of the reactive power adjusted by the second reactive power resource.

[0007] According to a method for determining the reactive power support capacity of a distribution network provided by the present application, the determining the second index value of the target feeder according to the power flow distribution data includes: According to the power flow distribution data, determine the second index value of the target feeder through the following formula (2): (2) Wherein, represents the second index value, represents the number of preset nodes, represents the preset node and the preset node 's coupling coefficient therebetween, represents the reactive power margin of the preset node , represents the reference value corresponding to the reactive power margin of each of the preset nodes, represents the sparsity index of the nodes in the power grid area near the preset node , represents the impedance value between the preset node j and the preset node k, represents the reference value of the impedance of the target feeder.

[0008] According to a method for determining the reactive power support capacity of a distribution network provided by the present application, after obtaining the reactive power resource set and before determining the first index value of each reactive power resource in the reactive power resource set, the method further includes: Adjust the output value of the reactive power of each reactive power resource in the reactive power resource set one by one. After the output value of the reactive power of each reactive power resource is adjusted, perform a power flow calculation on the distribution network according to the operation data of the distribution network to obtain the power flow distribution data corresponding to each reactive power resource; Before determining the update condition according to the output value of the reactive power of the first reactive power resource in the power flow distribution data and before repeating the above steps, the method further includes: Update the operation data of the distribution network according to the output value of the reactive power of the first reactive power resource in the update condition.

[0009] According to a method for determining the reactive power support capacity of a distribution network provided by the present application, the preset nodes include the bifurcation points of the target feeder and the branches and the points where power injection exists on the target feeder; The preset condition is that the voltage values of each preset node in the power flow distribution data are within a preset voltage range, and the power of each branch is within a preset power range.

[0010] The present application further provides a device for determining the reactive power support capacity of a distribution network, including the following modules: A first acquisition module, configured to acquire a reactive power resource set, where the reactive power resource set includes all reactive power resources on a target feeder in the distribution network, the target feeder is a distribution line connecting the distribution network to the low-voltage side of the main grid, and the reactive power resources are used to provide reactive power to the distribution network; A first determination module, configured to determine the first index value of each reactive power resource in the reactive power resource set, and determine the reactive power resource with the largest first index value as the first reactive power resource, where the first index value represents the ability of the reactive power resource to adjust the voltage distribution in the distribution network; A second acquisition module, configured to acquire the power flow distribution data corresponding to the first reactive power resource, and determine the second index value of the target feeder according to the power flow distribution data, where the power flow distribution data is obtained by performing a power flow calculation on the distribution network after the output value of the reactive power of the first reactive power resource is adjusted, and the second index value represents the ability of the target feeder to adjust the voltage fluctuation in the distribution network after the output value of the reactive power of the first reactive power resource is adjusted; A first update module, configured to update the cumulative value of the reactive power change amplitude at the gateway device on the target feeder according to the power flow distribution data if the power flow distribution data meets a preset condition and the second index value is within a preset range, where the gateway device is located at the physical connection between the main power grid and the distribution network; A second determination module, configured to delete the first reactive power resource from the reactive power resource set and determine an update condition according to the output value of the reactive power of the first reactive power resource in the power flow distribution data, where the update condition is used to determine the new first index value and the new power flow distribution data; A loop module, configured to repeat the above steps until a preset stop condition is met, where the preset stop condition is any one of the following: the reactive power resource set is an empty set, the power flow distribution data corresponding to all remaining reactive power resources does not meet the preset condition, and the second index value is not within the preset range; A third determination module, configured to determine the reactive power that the distribution network can provide to the main power grid according to the cumulative value of the reactive power change amplitude when the preset stop condition is met. The present application further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where when the processor executes the computer program, a method for determining the reactive power support ability of a distribution network as described in any one of the above is implemented.

[0011] The present application further provides a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, a method for determining the reactive power support ability of a distribution network as described in any one of the above is implemented.

[0012] The present application further provides a computer program product, including a computer program, and when the computer program is executed by a processor, a method for determining the reactive power support ability of a distribution network as described in any one of the above is implemented.

[0013] The present application provides a method, device, equipment, and medium for determining the reactive power support ability of a distribution network. In the present application, by quantifying indicators, the ability to regulate the voltage distribution in the distribution network by reactive power resources (the first index value) and the ability of the target feeder to regulate the voltage fluctuation in the distribution network after adjusting the output value of the reactive power of the first reactive power resource (the second index value) are added in the process of evaluating the reactive power support ability of the distribution network. Therefore, the reactive power that the distribution network can provide to the main power grid finally determined is the result of considering the reactive power demand of the distribution network itself or the result of considering the controllable margin of the reactive power of the distribution network itself. Therefore, there will be no phenomenon of overestimating the ability of the distribution network to provide reactive power to the main power grid, and the reliability of power grid operation can be effectively improved. Description of the Drawings

[0014] To more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a flowchart of a method for determining the reactive power support ability of a distribution network shown in an embodiment of the present application; Figure 2 It is a schematic diagram of the connection relationship between a main power grid and a distribution network shown in an embodiment of the present application; Figure 3 It is a schematic diagram of the distribution of preset nodes shown in an embodiment of the present application; Figure 4 It is a complete flowchart of a method for determining the reactive power support ability of a distribution network shown in an embodiment of the present application; Figure 5 It is a structural block diagram of a device for determining the reactive power support ability of a distribution network shown in an embodiment of the present application; Figure 6 It is a schematic diagram of the physical structure of an electronic device shown in an embodiment of the present application. Detailed implementation manners

[0016] To make the objectives, technical solutions and advantages of the present application clearer, the following will clearly and completely describe the technical solutions in the present application with reference to the accompanying drawings in the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present application belong to the scope of protection of the present application.

[0017] The following will be described in conjunction with Figures 1 - 4 a method for determining the reactive power support ability of a distribution network of the present application.

[0018] The execution subject of a method for determining the reactive power support ability of a distribution network provided by the present application is the distribution automation master station system in the distribution network, also known as the Distribution Management System (DMS), which is a power automation management system. The distribution management system consists of an open network infrastructure platform and multiple relatively independent application subsystems running on this platform. These application subsystems include real-time control, distribution network analysis, and several functional modules for planning purposes in a research environment.

[0019] Figure 1It is a flowchart of a method for determining the reactive power support capacity of a distribution network shown in an embodiment of the present application. Refer to Figure 1 , the method for determining the reactive power support capacity of the distribution network in the present application specifically includes the following steps: Step 101: Obtain a reactive power resource set, where the reactive power resource set includes all reactive power resources on the target feeder in the distribution network. The target feeder is a distribution line connecting the distribution network to the low-voltage side of the main grid, and the reactive power resources are used to provide reactive power to the distribution network.

[0020] In this embodiment, the reactive power resources refer to resources that can be controlled by the distribution automation master station system (DMS) and can adjust the reactive power injected into the distribution network up and down, including but not limited to distributed photovoltaic inverters, line shunt capacitors / reactors, etc.

[0021] All resource information in the distribution network is recorded in the distribution automation master station system. Therefore, in this embodiment, all reactive power resources on the target feeder in the distribution network can be directly obtained from these resource information, and then the reactive power resource set can be obtained.

[0022] Since only the reactive power support capacity of the distribution network for the main grid is considered in the present application, when obtaining the reactive power resource set, only the part of the target feeder in the distribution network is considered. Among them, a gateway device (which can accurately measure the electric energy transmitted between the distribution network and the main grid and provide reliable data support for the dispatching and operation of the power grid) is set at the physical connection point between the distribution network and the main grid. The gateway device is located in the substation and serves as the gateway for power interaction between the distribution network and the main grid in the present application. Therefore, considering the part of the target feeder in the distribution network actually means considering the part of the target feeder after the gateway device, as shown in the distribution network area in Figure 2 . Figure 2 It is a schematic diagram of the connection relationship between the main grid and the distribution network shown in an embodiment of the present application.

[0023] In this embodiment, the main grid refers to the high-voltage network in the power system, which is mainly responsible for transmitting the electric energy generated by large-scale power plants over long distances and with high efficiency to each load center or substation. The main grid usually includes high-voltage transmission lines (such as 110 kV, 220 kV, 330 kV, 500 kV, etc.) and related substation equipment, and has the characteristics of high voltage level, large transmission capacity, ability to realize long-distance transmission of electric energy, and complex structure.

[0024] The distribution network, also known as the distribution system, is the low-voltage network in the power system, mainly responsible for distributing the electric energy transmitted from the main power grid to each user terminal. The distribution network usually includes medium-voltage (such as 10 kV, 20 kV, etc.) and low-voltage (such as 380 V, 220 V, etc.) distribution lines, distribution transformers, switchgear, protection devices, etc. The voltage level of the distribution network is relatively low, and the transmission capacity is relatively small. It is mainly used for the distribution of electric energy in urban, rural and other areas.

[0025] In this embodiment, steps 101 - 107 are described by taking the number of target feeders as one example. In actual implementation, the number of target feeders can be multiple. When there are multiple target feeders, for each target feeder, the reactive power that it can provide to the main power grid is obtained according to steps 101 - 107. Finally, the total value of the reactive power that all target feeders can provide to the main power grid is used as the reactive power that the entire distribution network can provide to the main power grid.

[0026] Step 102: Determine the first index value of each reactive resource in the reactive resource set, and determine the reactive resource with the largest first index value as the first reactive resource. The first index value represents the ability of the reactive resource to regulate the voltage distribution in the distribution network.

[0027] In this embodiment, the higher the first index value, the stronger the ability of the reactive resource to regulate the voltage distribution in the distribution network; the lower the first index value, the lower the ability of the reactive resource to regulate the voltage distribution in the distribution network.

[0028] In actual implementation, any index that can represent the ability of the reactive resource to regulate the voltage distribution in the distribution network can be used as the first index. This embodiment does not specifically limit the type of the first index.

[0029] Execute step 102, sort each reactive resource in the reactive resource set in descending order according to the first index value, and then use the reactive resource ranked first as the first reactive resource. If there are multiple reactive resources with the same first index value in the reactive resource set, then these reactive resources with the same first index value can be arranged in any order among themselves.

[0030] In this embodiment, after obtaining the reactive resource set and before determining the first index value of each reactive resource in the reactive resource set, the method of this application further includes: Individually adjust the output value of the reactive power of each reactive resource in the reactive resource set, and after the output value of the reactive power of each reactive resource is adjusted, perform a power flow calculation on the distribution network according to the operation data of the distribution network to obtain the power flow distribution data corresponding to each reactive resource.

[0031] In this embodiment, before calculating the power flow distribution data, it is also necessary to calculate the initial power flow distribution data according to the reference operating data of the distribution network. The reference operating data of the distribution network are the data used for simulating the distribution network. The reference operating data of the distribution network are obtained according to the current actual operating data of the distribution network. When step 101-step 105 are executed for the first time, the reference operating data of the distribution network are the current actual operating data of the distribution network, while when step 101-step 105 are executed subsequently, the reference operating data of the distribution network are the updated reference operating data in the previous cycle.

[0032] When step 101-step 105 are executed for the first time, the initial power flow distribution data are calculated according to the reference operating data of the distribution network without modifying the output value of the reactive power of the reactive resources (that is, the output value of the reactive power of each reactive resource in the reference operating data of the distribution network is the output value during the current actual operation), while the power flow distribution data are calculated according to the reference operating data of the distribution network assuming that the output value of the reactive power of the reactive resources is modified (that is, the output value of the reactive power of a certain reactive resource in the reference operating data of the distribution network is the modified output value, while the output values of the reactive powers of the remaining reactive resources are the output values during their current actual operation).

[0033] Among them, power flow calculation, also known as electric power flow calculation, refers to a basic electrical calculation for studying the steady-state operation of a power system. It calculates the distribution of active power, reactive power, and voltage in the power grid according to the given power system network topology, component parameters, and generation and load parameters. These parameters include the wiring mode of the power grid, the parameters of each component (such as generators, transformers, lines, etc.), as well as the output of generators and the demand of loads. The power flow distribution data in this application include the voltage information, active power information, reactive power information of each preset node, the active power information of each branch, the active power information of each branch, etc.

[0034] In this embodiment, if the reactive power resource set includes reactive power resources 1 to N, first, based on the reference operation data of the distribution network, it is assumed that only the output value of the reactive power of reactive power resource 1 is modified to the target output value 1. Then, according to the reference operation data of the distribution network after the assumed modification, a power flow calculation is performed on the distribution network to obtain the power flow distribution data 1 corresponding to reactive power resource 1. Next, based on the reference operation data of the distribution network (the reference operation data before the modification of reactive power resource 1, not the reference operation data obtained after the modification of reactive power resource 1), it is assumed that only the output value of the reactive power of reactive power resource 2 is modified to the target output value 2. Then, according to the reference operation data of the distribution network after the assumed modification, a power flow calculation is performed on the distribution network to obtain the power flow distribution data 2 corresponding to reactive power resource 2. According to the above principle, the power flow distribution data corresponding to reactive power resources 1 to N are calculated in sequence. It should be noted that in this round of calculations above, since the simulation calculations are performed in the distribution automation master station system, the modifications to the output values of the reactive power of the reactive power resources are all assumed and will not affect the actual output values of the reactive power of each reactive power resource in the distribution network.

[0035] In this embodiment, one complete calculation of steps 101 to 107 is called one cycle. In one cycle, when calculating the power flow distribution data corresponding to each reactive power resource, the modifications are all made on the same reference operation data of the distribution network. In different cycles, the reference operation data of the distribution network are different, and the reference operation data of the distribution network used in this cycle is the updated reference operation data of the distribution network in the previous cycle.

[0036] The following will provide a method for calculating in detail the first index value corresponding to each reactive power resource in the reactive power resource set. For any reactive power resource (hereinafter referred to as: the second reactive power resource) in the reactive power resource set, determining the first index value of the second reactive power resource may include: Step 1: Obtain the voltage values of each preset node in the power flow distribution data corresponding to the second reactive power resource. The power flow distribution data corresponding to the second reactive power resource is obtained by performing a power flow calculation on the distribution network after adjusting the output value of the reactive power. The preset nodes include any one of the bifurcation points of the target feeder and the branch and the points where power injection exists on the target feeder.

[0037] In this embodiment, the information of each preset node in the distribution network can be obtained from all the resource information of the distribution network recorded in the distribution automation master station system. In the distribution network, the bifurcation points of all branches and the target feeder and all the points that can inject power into the target feeder are preset nodes, and some loads are connected at each preset node (static concept, even if the load is 0 at a certain moment, the corresponding preset node still exists). Figure 3 This is a schematic diagram showing the distribution of a preset node shown in an embodiment of the present application.Figure 3 There are 33 preset nodes exemplified. Among them, preset nodes 2, 3, and 6 are the bifurcation points of the branch and the target feeder, and the remaining preset nodes are the nodes that can inject power into the target feeder. In actual implementation, since some bifurcation points can also inject power into the target feeder, in this application, as long as a node meets any one of the conditions of being a bifurcation point and being able to inject power into the target feeder, it can be used as a preset node.

[0038] After determining each preset node, the voltage values of each preset node can be extracted from the power flow distribution data corresponding to the second reactive power resource.

[0039] Step 2: Determine the third index value corresponding to the second reactive power resource according to the voltage values of each preset node. The third index value represents the ability of the second reactive power resource to regulate the voltage distribution in the distribution network.

[0040] Step 3: Determine the first index value corresponding to the second reactive power resource as the difference between the third index value and the initial value corresponding to the third index value.

[0041] Among them, the first index value is obtained by subtracting the initial value corresponding to the third index value from the third index value. Both the third index value and the first index value can represent the ability of the second reactive power resource to regulate the voltage distribution in the distribution network.

[0042] Specifically, step 2 may include: Determining the third index value corresponding to the second reactive power resource according to the voltage values of each preset node includes: According to the voltage values of each preset node, determine the third index value corresponding to the second reactive power resource through the following formula: Among them, represents the serial number of the second reactive power resource in the reactive power resource set, represents the third index value corresponding to the second reactive power resource, represents the number of preset nodes, represents the voltage value of the preset node after the output value of the reactive power to be adjusted of the second reactive power resource, represents the preset node the maximum qualified voltage, represents the preset node the minimum qualified voltage, represents the average voltage value of all preset nodes after the output value of the reactive power to be adjusted of the second reactive power resource.

[0043] In this embodiment, the power flow performance index (Power Flow Performance Index, is the third indicator, used to measure the improvement level of the voltage distribution of the distribution network after adjusting the output value of the reactive power for regulating reactive power resources .

[0044] Specifically, step 3 may include: Determine the first indicator value corresponding to the second reactive power resource through the following formula: where the reactive power source regulation performance index (VRPI) is the first indicator, represents the serial number of the second reactive power resource in the reactive power resource set, represents the first indicator value corresponding to the second reactive power resource, represents the initial value corresponding to the third indicator value.

[0045] is a value calculated according to the initial power flow data through the above calculation formula.

[0046] Step 103, obtain the power flow distribution data corresponding to the first reactive power resource, and determine the second indicator value of the target feeder according to the power flow distribution data. The power flow distribution data is obtained by performing a power flow calculation on the distribution network after adjusting the output value of the reactive power of the first reactive power resource. The second indicator value represents the ability of the target feeder to regulate the voltage fluctuation in the distribution network after adjusting the output value of the reactive power of the first reactive power resource.

[0047] Specifically, determining the second indicator value of the target feeder according to the power flow distribution data includes: Determine the second indicator value of the target feeder through the following formula according to the power flow distribution data: (2) where represents the second indicator value, represents the number of preset nodes, represents the preset node and the preset node coupling coefficient between, represents the preset node reactive power margin, represents the reference value corresponding to the reactive power margin of each preset node, represents the preset node sparsity index of nodes in the nearby power grid area, represents the preset node and the impedance value between the preset node k, represents the reference value of the impedance of the target feeder, and \(e\) represents the base of the natural logarithm.

[0048] In this embodiment, the corresponding to each preset node is the same. Actually, it represents how much reactive power margin is at least required on average for each preset node.

[0049] In this embodiment, the voltage-reactive power controllable margin index (Volt-Var Controllable Magin Index, VVCMI) is the second index.

[0050] Among them, is between 0 and 1, 1 represents the closest, and 0 represents no association.

[0051] In the distribution network, the reactive power margin of a preset node represents the difference between the maximum reactive power that the preset node can provide and the reactive power required by the maximum load of the preset node under the normal operation state of the power system. The preset node 's reactive power margin reaching means that the reactive power margin of the preset node is sufficient.

[0052] represents the sparsity index of the nodes in the power grid area near the th preset node. This value is between 0 and 1. 1 means that there are no other preset nodes near the preset node and 0 means that the density of the preset nodes near the preset node is very large.

[0053] represents the reference value of the impedance of the target feeder, and the average value of the impedances of the head and end nodes of the target feeder can be selected.

[0054] Step 104: If the power flow distribution data meets the preset conditions and the value of the second index is within the preset range, update the cumulative value of the change amplitude of the reactive power at the switching device on the target feeder according to the power flow distribution data. The switching device is located at the physical connection between the main power grid and the distribution network.

[0055] In one implementation, the preset nodes include the bifurcation points of the target feeder and the branches and the points where power injection exists on the target feeder; the preset conditions are that the voltage values of the respective preset nodes in the power flow distribution data are within the preset voltage range, and the powers of the respective branches are within the preset power range.

[0056] In this embodiment, if the preset nodes include both the bifurcation point of the target feeder and the branch and the point where power injection exists on the target feeder, then only when the voltage values of each preset node in the power flow distribution data are within the preset voltage range and the power of each branch is within the preset power range, can it be determined that the power flow distribution data meets the preset conditions.

[0057] In one implementation, if the preset nodes only include the points where power injection exists on the target feeder and do not include the bifurcation point of the target feeder and the branch, then the preset condition is that the voltage values of each preset node in the power flow distribution data are within the preset voltage range, that is, only when the voltage values of each preset node in the power flow distribution data are within the preset voltage range, can it be determined that the power flow distribution data meets the preset conditions.

[0058] For the second index value, the preset range can be defined according to actual needs and can usually be set to 0 to 1 (including 0 and 1). When the second index value is 0, it means there is no requirement for the controllable margin. When the second index value is 1, it means the requirement for the controllable margin is the highest.

[0059] In this embodiment, if the power flow distribution data meets the preset conditions and the second index value is within the preset range, obtain the reactive power of the first reactive resource in the power flow distribution data corresponding to the first reactive resource, and then obtain the difference between this reactive power and the reactive power when the first reactive resource actually operates in the current distribution network. Update the cumulative value of the reactive power change amplitude at the gateway device on the target feeder according to this difference , that is, the updated = the previous + the difference.

[0060] In this embodiment, after determining the second index value of the target feeder according to the power flow distribution data and before deleting the first reactive resource from the reactive resource set, the method of the present application may further include: If the power flow distribution data does not meet the preset conditions, or the second index value is not within the preset range, sequentially read each reactive resource in the reactive resource set sorted in descending order according to the first index value and make a judgment until a new first reactive resource is obtained; wherein, the power flow distribution data corresponding to the new first reactive resource meets the preset conditions, and the second index value corresponding to the new first reactive resource is within the preset range.

[0061] In this embodiment, if the power flow distribution data does not meet the preset conditions, or the second index value is not within the preset range, then in the reactive power resource set sorted in descending order according to the first index value, read the next reactive power resource after the first reactive power resource (assumed to be reactive power resource M), and determine whether the power flow distribution data corresponding to the reactive power resource M meets the preset conditions, and whether the second index value corresponding to the reactive power resource M is within the preset range. If the power flow distribution data corresponding to the reactive power resource M meets the preset conditions and the second index value corresponding to the reactive power resource M is within the preset range, then use the reactive power resource M as the new first reactive power resource for subsequent steps, that is, update the cumulative value of the reactive power change amplitude at the gateway device on the target feeder according to the power flow distribution data corresponding to the reactive power resource M. . If the power flow distribution data corresponding to the reactive power resource M does not meet the preset conditions, or the second index value corresponding to the reactive power resource M is not within the preset range, read the next reactive power resource after the reactive power resource M (assumed to be reactive power resource N), and determine whether the power flow distribution data corresponding to the reactive power resource N meets the preset conditions, and whether the second index value corresponding to the reactive power resource N is within the preset range. The subsequent process is the same as the judgment process of the above reactive power resource M.

[0062] In summary, in this embodiment, it is necessary to use the power flow distribution data corresponding to the first reactive power resource that meets the specified requirements (the power flow distribution data meets the preset conditions and the second index value is within the preset range) in the reactive power resource set sorted in descending order according to the first index value for updating. .

[0063] Step 105: Delete the first reactive power resource from the reactive power resource set, and determine an update condition according to the output value of the reactive power of the first reactive power resource in the power flow distribution data. The update condition is used to determine the new first index value and the new power flow distribution data.

[0064] In this embodiment, after successful update , delete the first reactive power resource from the reactive power resource set.

[0065] Among them, the update condition includes: the output value of the reactive power of the first reactive power resource in the power flow distribution data corresponding to the first reactive power resource, that is, the target output value of the reactive power of the modified first reactive power resource.

[0066] Before determining the update condition according to the output value of the reactive power of the first reactive power resource in the power flow distribution data and before repeating the above steps, the method of the present application may further include: Update the operation data of the distribution network according to the output value of the reactive power of the first reactive power resource in the update condition.

[0067] In this embodiment, the target output value of the reactive power of the modified first reactive resource is used to update the reference operation data of the distribution network, and the updated reference operation data of the distribution network will be used in the next round of loop. In other words, in the reference operation data of the distribution network used in the next round of loop, the output value of the reactive power of the first reactive resource should be the target output value.

[0068] Step 106: Repeat the above steps until a preset stop condition is met. The preset stop condition is any one of the following: the reactive resource set is an empty set, the power flow distribution data corresponding to all remaining reactive resources do not meet the preset conditions, and the second index value is not within the preset range.

[0069] In each successful update using a reactive resource after that, one reactive resource will be reduced from the reactive resource set. Therefore, after repeating steps 101 - 106 multiple times, the reactive resource set will finally become an empty set.

[0070] Step 107: When the preset stop condition is met, determine the reactive power that the distribution network can provide to the main grid according to the cumulative value of the reactive power change amplitude.

[0071] In this embodiment, the cumulative value of the reactive power change amplitude can be a positive value or a negative value. When is a positive value, it means that the range of the reactive power that the distribution network can increase to the main grid is 0~+ ; when is a negative value, it means that the range of the reactive power that the distribution network can decrease to the main grid is - ~0.

[0072] In this embodiment, represents the reactive power that the target feeder can provide to the main grid, and steps 101 - 107 are described with one target feeder as an example. Therefore, in this embodiment, can also represent the reactive power that the distribution network can provide to the main grid. In actual implementation, if the number of target feeders is multiple, each target feeder needs to obtain the corresponding according to steps 101 - 107, and then use the sum value of the corresponding to all target feeders as the reactive power that the distribution network can provide to the main grid.

[0073] After the distribution automation master station system obtains the reactive power that the distribution network can provide to the main power grid, once it receives a request from the main grid dispatching system (Energy Management System, EMS) to obtain the reactive power support data of the distribution network for the main power grid, it can respond to this request and send the reactive power that the distribution network can provide to the main power grid calculated in step 107 to the main grid dispatching system, so that the main grid dispatching system can perform subsequent analysis and decision-making based on the reactive power support data of the distribution network.

[0074] Among them, the main grid dispatching system is one of the core systems of power system automation, mainly used for the dispatching and operation management of the power system. The system monitors and analyzes the operating status of the power system, including the operating conditions and load status of each link such as generator sets, transmission lines, and substations, to achieve comprehensive control and dispatching of the power system.

[0075] To implement the method for determining the reactive power support capacity of the distribution network in this application, first, obtain the reactive power resource set, determine the first index value of each reactive power resource in the reactive power resource set, and determine the reactive power resource with the largest first index value as the first reactive power resource; then, obtain the power flow distribution data corresponding to the first reactive power resource, and determine the second index value of the target feeder according to the power flow distribution data. If the power flow distribution data meets the preset conditions and the second index value is within the preset range, update the cumulative value of the reactive power change amplitude at the gateway device on the target feeder according to the power flow distribution data; then, delete the first reactive power resource from the reactive power resource set, and determine the update condition according to the output value of the reactive power of the first reactive power resource in the power flow distribution data; then continuously repeat the above steps until the preset stop condition is met. The preset stop condition is any one of the following: the reactive power resource set is an empty set, the power flow distribution data corresponding to all remaining reactive power resources does not meet the preset conditions, the second index value is not within the preset range. At this time, determine the reactive power that the distribution network can provide to the main power grid according to the cumulative value of the reactive power change amplitude. In this application, by quantifying the indicators, the ability of the reactive power resource to regulate the voltage distribution in the distribution network (the first index value) and the ability of the target feeder to regulate the voltage fluctuation in the distribution network after adjusting the output value of the reactive power of the first reactive power resource (the second index value) are added in the process of evaluating the reactive power support capacity of the distribution network. Therefore, the reactive power that the distribution network can provide to the main power grid finally determined is the result of considering the reactive power demand of the distribution network itself or the result of considering the controllable margin of the reactive power of the distribution network itself. Therefore, there will be no phenomenon of overestimating the ability of the distribution network to provide reactive power to the main power grid, and the reliability of the power grid operation can be effectively improved.

[0076] Figure 4 It is the complete flowchart of a method for determining the reactive power support capacity of a distribution network shown in an embodiment of this application. Next, it will be referred to Figure 1, a complete embodiment is used to elaborate in detail the method for determining the reactive power support capacity of the present application. In this embodiment, it is assumed that the number of target feeders is 1, and it specifically includes the following multiple steps: Step1: Obtain all reactive power resources in the target feeder, with the number being N, to obtain set S, that is, all elements in set S are reactive power resource 1 - reactive power resource N; Step2: According to the reference operation data of the distribution network, calculate the initial power flow distribution data. In this step, the reference operation data of the distribution network is the current actual operation data of the distribution network; Step3: According to the initial power flow distribution data obtained in Step2, calculate the initial power flow evaluation index ; Step4: Based on set S and the reference operation data of the distribution network, assume that only the output value of the reactive power of reactive power resource 1 is modified (modified to the target output value 1), and then according to the assumed modified reference operation data of the distribution network, perform power flow calculation on the distribution network to obtain the power flow distribution data 1 corresponding to reactive power resource 1; then, based on the reference operation data of the distribution network (the reference operation data before modifying the reactive power of reactive power resource 1), assume that only the output value of the reactive power of reactive power resource 2 is modified (modified to the target output value 2), and then according to the assumed modified reference operation data of the distribution network, perform power flow calculation on the distribution network to obtain the power flow distribution data 2 corresponding to reactive power resource 2. According to the above principle, calculate the power flow distribution data corresponding to reactive power resource 1 - reactive power resource N respectively, which are power flow distribution data 1 - power flow distribution data N in sequence; Step5: According to the power flow distribution data 1 - power flow distribution data N obtained in Step4, calculate the power flow evaluation indexes corresponding to reactive power resource 1 - reactive power resource N respectively - , specifically calculated according to power flow distribution data 1 , calculated according to power flow distribution data 2 …… calculated according to power flow distribution data N ; Step6: According to , calculate the reactive power source adjustment effect indexes corresponding to reactive power resource 1 - reactive power resource N respectively - , specifically take ( ) as , specifically take ( ) as …… take ( ) as ; Step7: Add reactive power resource 1 - reactive power resource N to the queue queue (that is Figure 4in the queue q), and arrange them in descending order according to the value of the reactive power source regulation effect index VRPI. The queue queue after the descending order is called the target queue; Step8: Obtain the first reactive power resource in the target queue, assume it is reactive power resource 5. Then, further obtain the power flow distribution data 5 corresponding to reactive power resource 5, and calculate the voltage reactive power controllable margin index VVCMI according to the power flow distribution data 5 (indicating how much ability the target feeder has to cope with the voltage fluctuation problem inside itself after modifying the output value of the reactive power of reactive power resource 5 to the target output value 5). Determine whether the power flow distribution data 5 meets the preset conditions and whether VVCMI is within the preset range, that is, determine whether there is an over-limit situation for the power flow distribution data 5 or VVCMI; if the power flow distribution data 5 is over-limit, or VVCMI is over-limit, enter Step9, otherwise enter Step11; Step9: Pop the first reactive power resource (i.e., reactive power resource 5) in the target queue; Step10: Determine whether the target queue is empty. If it is, end; otherwise, return to Step8; Step11: In the reference operation data of the distribution network, modify the output value of the reactive power of reactive power resource 5 to the target output value 5 to obtain the updated reference operation data of the distribution network, and this data is used as the reference operation data of the distribution network for the next cycle; Step12: According to the updated reference operation data of the distribution network in Step11, calculate and obtain the new ; Step13: Obtain the difference between the reactive power of reactive power resource 5 and the reactive power during the actual operation of reactive power resource 5 in the current distribution network, and update the cumulative value of the reactive power change amplitude at the gateway equipment on the target feeder according to this difference , that is, the updated = the previous + the difference; Step14: Delete reactive power resource 5 from the set S, and decrement the value of N by 1; Step15: Determine whether N is less than or equal to 0. If it is, end; otherwise, return to Step4 and enter the loop process again based on the updated set S.

[0077] After the end, take as the reactive power that the target feeder can provide to the main power grid.

[0078] In the above process, the used in each cycle are all different, and the

[0079] In the process of evaluating the reactive power support ability of the distribution network in this application, the power flow evaluation index PFPI, the reactive power source regulation effect index VRPI, and the voltage reactive power controllable margin index VVCMI are introduced. That is, in the process of determining the reactive power that the distribution network can provide to the main grid, the reactive power demand of the distribution network itself is considered. Therefore, there will be no phenomenon of overestimating the ability of the distribution network to provide reactive power to the main grid, and the reliability of the power grid operation can be effectively improved.

[0080] The device for determining the reactive power support ability of the distribution network provided in this application will be described below. The device for determining the reactive power support ability of the distribution network described below can be correspondingly referred to the method for determining the reactive power support ability of the distribution network described above.

[0081] The device for determining the reactive power support ability of the distribution network provided in this application is deployed in the distribution automation master station system. Figure 5 It is a structural block diagram of a device for determining the reactive power support ability of a distribution network shown in an embodiment of this application. Refer to Figure 5 , the device 500 for determining the reactive power support ability of the distribution network in this application includes: A first acquisition module 501, configured to acquire a reactive power resource set, where the reactive power resource set includes all reactive power resources on a target feeder in the distribution network, the target feeder is a distribution line connecting the distribution network to the low-voltage side of the main grid, and the reactive power resources are used to provide reactive power to the distribution network; A first determination module 502, configured to determine a first index value of each of the reactive power resources in the reactive power resource set, and determine the reactive power resource with the largest first index value as the first reactive power resource, where the first index value represents the ability of the reactive power resource to regulate the voltage distribution in the distribution network; A second acquisition module 503, configured to acquire the power flow distribution data corresponding to the first reactive power resource, and determine a second index value of the target feeder according to the power flow distribution data, where the power flow distribution data is obtained by performing a power flow calculation on the distribution network after adjusting the output value of the reactive power of the first reactive power resource, and the second index value represents the ability of the target feeder to regulate the voltage fluctuation in the distribution network after adjusting the output value of the reactive power of the first reactive power resource; A first update module 504, configured to update the cumulative value of the reactive power change amplitude at the switching device on the target feeder according to the power flow distribution data if the power flow distribution data meets a preset condition and the second index value is within a preset range, where the switching device is located at the physical connection between the main grid and the distribution network; A second determination module 505, configured to delete the first reactive power resource from the reactive power resource set, and determine an update condition according to an output value of reactive power of the first reactive power resource in the power flow distribution data, where the update condition is used to determine a new first index value and new power flow distribution data; A loop module 506, configured to repeat the above steps until a preset stop condition is met, where the preset stop condition is any one of the following: the reactive power resource set is an empty set, power flow distribution data corresponding to all remaining reactive power resources do not meet the preset condition, or the second index value is not within the preset range; A third determination module 507, configured to determine reactive power that the distribution network can provide to the main grid according to an accumulated value of the reactive power change amplitude when the preset stop condition is met.

[0082] According to the device 500 for determining the reactive power support capability of a distribution network provided by the present application, the device 500 further includes: A third acquisition module, configured to, if the power flow distribution data does not meet the preset condition, or the second index value is not within the preset range, sequentially read each reactive power resource in the reactive power resource set sorted in descending order according to the first index value and make a judgment until a new first reactive power resource is obtained; wherein, the power flow distribution data corresponding to the new first reactive power resource meets the preset condition, and the second index value corresponding to the new first reactive power resource is within the preset range.

[0083] According to the device 500 for determining the reactive power support capability of a distribution network provided by the present application, the reactive power resource set includes a second reactive power resource, and the second reactive power resource is any one reactive power resource in the reactive power resource set; the first determination module 502 includes: An acquisition sub-module, configured to acquire voltage values of each preset node in the power flow distribution data corresponding to the second reactive power resource, where the power flow distribution data corresponding to the second reactive power resource is obtained by performing a power flow calculation on the distribution network after an output value of the reactive power adjusted by the second reactive power resource, and the preset node includes any one of a bifurcation point of the target feeder and a branch and a point where power injection exists on the target feeder; A first determination sub-module, configured to determine a third index value corresponding to the second reactive power resource according to the voltage values of each preset node, where the third index value represents the ability of the second reactive power resource to adjust the voltage distribution in the distribution network; A second determination sub-module, configured to determine a difference between the third index value and an initial value corresponding to the third index value as a first index value corresponding to the second reactive power resource.

[0084] For the device 500 for determining the reactive power support capacity of a distribution network provided by the present application, the first determination sub-module includes: A second determination sub-module, configured to determine a third index value corresponding to the second reactive power resource according to the voltage values of the respective preset nodes through the following formula (1): (1) Wherein, represents the serial number of the second reactive power resource in the reactive power resource set, represents the third index value corresponding to the second reactive power resource, represents the number of preset nodes, represents the voltage value of the preset node after the output value of the reactive power to be adjusted of the second reactive power resource, represents the preset node the maximum qualified voltage, represents the preset node the minimum qualified voltage, represents the average voltage value of all preset nodes after the output value of the reactive power to be adjusted of the second reactive power resource.

[0085] For the device 500 for determining the reactive power support capacity of a distribution network provided by the present application, the second acquisition module 503 includes: A third determination sub-module, configured to determine a second index value of the target feeder according to the power flow distribution data through the following formula (2): (2) Wherein, represents the second index value, represents the number of preset nodes, represents the preset node and the preset node the coupling coefficient between, represents the reactive power margin of the preset node , represents the reference value corresponding to the reactive power margin of each of the preset nodes, represents the sparsity index of the nodes in the power grid area near the j-th preset node , represents the impedance value between the preset node j and the preset node k, represents the reference value of the impedance of the target feeder.

[0086] For the device 500 for determining the reactive power support capacity of a distribution network provided by the present application, the device 500 further includes: A calculation module, configured to adjust the output value of the reactive power of each reactive resource in the reactive resource set one by one, and after the output value of the reactive power of each reactive resource is adjusted, perform a power flow calculation on the distribution network according to the operation data of the distribution network to obtain the power flow distribution data corresponding to each reactive resource; The device 500 further includes: A second update module, configured to update the operation data of the distribution network according to the output value of the reactive power of the first reactive resource in the update condition.

[0087] According to the device 500 for determining the reactive power support capacity of a distribution network provided by the present application, the preset nodes include the bifurcation points of the target feeder and the branch, and the points where power injection exists on the target feeder; The preset condition is that the voltage values of each preset node in the power flow distribution data are within a preset voltage range, and the power of each branch is within a preset power range.

[0088] The present application also provides an electronic device 600, which may specifically be an intelligent terminal deployed on one side of a target feeder. Figure 6 It is a schematic physical structure diagram of an electronic device shown in an embodiment of the present application. As Figure 6 shown, the electronic device 600 may include: a processor 610, a communication interface 620, a memory 630, and a communication bus 640. Among them, the processor 610, the communication interface 620, and the memory 630 complete mutual communication through the communication bus 640. The processor 610 may call the logical instructions in the memory 630 to execute a method for determining the reactive power support capacity of a distribution network, and the method includes: Obtain a reactive resource set, where the reactive resource set includes all reactive resources on a target feeder in a distribution network, the target feeder is a distribution line connecting the distribution network to the low-voltage side of the main grid, and the reactive resources are used to provide reactive power to the distribution network; Determine the first index value of each reactive resource in the reactive resource set, and determine the reactive resource with the largest first index value as the first reactive resource, where the first index value represents the ability of the reactive resource to adjust the voltage distribution in the distribution network; Obtain the power flow distribution data corresponding to the first reactive power resource, and determine the second index value of the target feeder according to the power flow distribution data. The power flow distribution data is obtained by performing a power flow calculation on the distribution network after the output value of the reactive power of the first reactive power resource is adjusted. The second index value represents the ability of the target feeder to regulate the voltage fluctuation in the distribution network after the output value of the reactive power of the first reactive power resource is adjusted; If the power flow distribution data meets the preset conditions and the second index value is within the preset range, update the cumulative value of the reactive power change amplitude at the gateway device on the target feeder according to the power flow distribution data. The gateway device is located at the physical connection between the main power grid and the distribution network; Delete the first reactive power resource from the reactive power resource set, and determine the update condition according to the output value of the reactive power of the first reactive power resource in the power flow distribution data. The update condition is used to determine the new first index value and the new power flow distribution data; Repeat the above steps until the preset stop condition is met. The preset stop condition is any one of the following: the reactive power resource set is an empty set, the power flow distribution data corresponding to all the remaining reactive power resources does not meet the preset conditions, and the second index value is not within the preset range; When the preset stop condition is met, determine the reactive power that the distribution network can provide to the main power grid according to the cumulative value of the reactive power change amplitude.

[0089] In addition, when the logical instructions in the above-mentioned memory 630 are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0090] On the other hand, the present application also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute a method for determining the reactive power support capacity of a distribution network provided by the above-mentioned various methods. The method includes: Obtain a reactive power resource set, where the reactive power resource set includes all reactive power resources on a target feeder in the distribution network. The target feeder is a distribution line connecting the distribution network to the low-voltage side of the main grid, and the reactive power resources are used to provide reactive power to the distribution network; Determine the first index value of each reactive power resource in the reactive power resource set, and determine the reactive power resource with the largest first index value as the first reactive power resource. The first index value represents the ability of the reactive power resource to adjust the voltage distribution in the distribution network; Obtain the power flow distribution data corresponding to the first reactive power resource, and determine the second index value of the target feeder according to the power flow distribution data. The power flow distribution data is obtained by performing a power flow calculation on the distribution network after the output value of the reactive power of the first reactive power resource is adjusted. The second index value represents the ability of the target feeder to adjust the voltage fluctuation in the distribution network after the output value of the reactive power of the first reactive power resource is adjusted; If the power flow distribution data meets the preset conditions and the second index value is within the preset range, update the cumulative value of the change amplitude of the reactive power at the gateway device on the target feeder according to the power flow distribution data. The gateway device is located at the physical connection between the main grid and the distribution network; Delete the first reactive power resource from the reactive power resource set, and determine an update condition according to the output value of the reactive power of the first reactive power resource in the power flow distribution data. The update condition is used to determine the new first index value and the new power flow distribution data; Repeat the above steps until a preset stop condition is met. The preset stop condition is any one of the following: the reactive power resource set is an empty set, the power flow distribution data corresponding to all remaining reactive power resources does not meet the preset conditions, and the second index value is not within the preset range; When the preset stop condition is met, determine the reactive power that the distribution network can provide to the main grid according to the cumulative value of the change amplitude of the reactive power.

[0091] On the other hand, the present application also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it realizes a method for determining the reactive power support capacity of a distribution network provided by the above-mentioned various methods. The method includes: Obtain a reactive power resource set, where all reactive power resources on a target feeder in the distribution network are included in the reactive power resource set. The target feeder is a distribution line connecting the distribution network to the low-voltage side of the main grid, and the reactive power resources are used to provide reactive power to the distribution network; Determine the first index value of each reactive power resource in the reactive power resource set, and determine the reactive power resource with the largest first index value as the first reactive power resource. The first index value represents the ability of the reactive power resource to regulate the voltage distribution in the distribution network; Obtain the power flow distribution data corresponding to the first reactive power resource, and determine the second index value of the target feeder according to the power flow distribution data. The power flow distribution data is obtained by performing a power flow calculation on the distribution network after adjusting the output value of the reactive power of the first reactive power resource. The second index value represents the ability of the target feeder to regulate the voltage fluctuation in the distribution network after adjusting the output value of the reactive power of the first reactive power resource; If the power flow distribution data meets the preset conditions and the second index value is within the preset range, update the cumulative value of the change amplitude of the reactive power at the gateway device on the target feeder according to the power flow distribution data. The gateway device is located at the physical connection between the main grid and the distribution network; Delete the first reactive power resource from the reactive power resource set, and determine the update condition according to the output value of the reactive power of the first reactive power resource in the power flow distribution data. The update condition is used to determine the new first index value and the new power flow distribution data; Repeat the above steps until the preset stop condition is met. The preset stop condition is any one of the following: the reactive power resource set is an empty set, the power flow distribution data corresponding to all remaining reactive power resources does not meet the preset conditions, and the second index value is not within the preset range; When the preset stop condition is met, determine the reactive power that the distribution network can provide to the main grid according to the cumulative value of the change amplitude of the reactive power.

[0092] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative labor.

[0093] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for determining the reactive support capacity of a distribution network, characterized in that: include: Acquire a reactive resource set, wherein the reactive resource set includes all reactive resources on a target feeder in a distribution network, wherein the target feeder is a distribution line connecting the distribution network to a low-voltage side of a main power grid, and the reactive resources are used to provide reactive power to the distribution network; Determine a first index value of each reactive resource in the reactive resource set, and determine the reactive resource with the largest first index value as a first reactive resource, wherein the first index value represents the ability of the reactive resource to regulate voltage distribution in the distribution network; Acquire power flow distribution data corresponding to the first reactive resource, and determine a second index value of the target feeder according to the power flow distribution data, wherein the power flow distribution data is obtained by performing power flow calculation on the distribution network after the output value of reactive power of the first reactive resource is adjusted, and the second index value indicates the ability of the target feeder to regulate voltage fluctuations in the distribution network after the output value of reactive power of the first reactive resource is adjusted; If the power flow distribution data meets the preset condition and the second index value is within a preset range, updating the cumulative value of the reactive power change amplitude at the gateway device on the target feeder according to the power flow distribution data, the gateway device being located at the physical connection between the main power grid and the distribution network; Deleting the first reactive resource from the reactive resource set, and determining an update condition according to the output value of the reactive power of the first reactive resource in the power flow distribution data, wherein the update condition is used to determine a new first indicator value and new power flow distribution data; Repeat the above steps until a preset stop condition is met, wherein the preset stop condition is any one of the following: the reactive resource set is an empty set, the power flow distribution data corresponding to all remaining reactive resources do not meet the preset condition, and the second indicator value is not within the preset range; When the preset stop condition is met, the reactive power that the distribution network can provide to the main power grid is determined according to the accumulated value of the reactive power variation amplitude.

2. The method according to claim 1, characterized in that After determining the second indicator value of the target feeder according to the power flow distribution data and before deleting the first reactive resource from the reactive resource set, the method further includes: If the power flow distribution data does not meet the preset condition, or the second index value is not within the preset range, read each of the reactive resources in the reactive resource set arranged in descending order according to the first index value in sequence and make a judgment until a new first reactive resource is obtained; The power flow distribution data corresponding to the new first reactive resource meets the preset condition, and the second indicator value corresponding to the new first reactive resource is within the preset range.

3. The method according to claim 1, characterized in that The reactive resource set includes a second reactive resource, and the second reactive resource is any reactive resource in the reactive resource set; and determining the first indicator value of each reactive resource in the reactive resource set includes: Obtaining a voltage value of each preset node in the power flow distribution data corresponding to the second reactive resource, wherein the power flow distribution data corresponding to the second reactive resource is obtained by performing power flow calculation on the distribution network after the output value of the reactive power of the second reactive resource is adjusted, and the preset node includes any one of a bifurcation point between the target feeder and a branch and a point where power injection exists on the target feeder; Determine, according to the voltage values ​​of the respective preset nodes, a third index value corresponding to the second reactive resource, wherein the third index value represents the ability of the second reactive resource to adjust the voltage distribution in the distribution network; A difference between the third indicator value and an initial value corresponding to the third indicator value is determined as a first indicator value corresponding to the second reactive resource.

4. The method according to claim 3, characterized in that The determining, according to the voltage values ​​of the respective preset nodes, a third indicator value corresponding to the second reactive resource comprises: According to the voltage values ​​of the preset nodes, the third indicator value corresponding to the second reactive resource is determined by the following formula (1): （1） in, Indicates the sequence number of the second reactive resource in the reactive resource set, represents the third indicator value corresponding to the second reactive resource, Indicates the number of preset nodes, Indicates that the second reactive resource presets the node after the reactive power output value is adjusted The voltage value, Represents a preset node The maximum qualified voltage, Represents a preset node The minimum qualified voltage, Represents the average voltage value of all preset nodes after the output value of the reactive power of the second reactive resource is adjusted.

5. The method according to claim 1, characterized in that: The determining the second index value of the target feeder according to the power flow distribution data comprises: According to the power flow distribution data, the second index value of the target feeder is determined by the following formula (2): （2） in, represents the second index value, Indicates the number of preset nodes, Represents a preset node and preset nodes The coupling coefficient between Represents a preset node The reactive power margin, represents the reference value corresponding to the reactive power margin of each of the preset nodes, Indicates the preset node The sparsity index of nodes in the nearby power grid area, represents the impedance value between the preset node j and the preset node k, Indicates the reference value of the impedance of the target feeder.

6. The method according to claim 1, characterized in that After acquiring the reactive resource set and before determining the first indicator value of each reactive resource in the reactive resource set, the method further includes: Adjusting the reactive power output value of each reactive resource in the reactive resource set one by one, and after the reactive power output value of each reactive resource is adjusted, performing power flow calculation on the distribution network according to the operation data of the distribution network to obtain power flow distribution data corresponding to each reactive resource; In determining the update condition according to the output value of the reactive power of the first reactive resource in the power flow distribution data, and before repeating the above steps, the method further includes: The operation data of the distribution network is updated according to the output value of the reactive power of the first reactive resource in the update condition.

7. The method according to any one of claims 1 to 6, characterized in that: The preset nodes include a bifurcation point between the target feeder and a branch and a point where power injection occurs on the target feeder; The preset condition is that the voltage value of each of the preset nodes in the power flow distribution data is within a preset voltage range, and the power of each of the branches is within a preset power range.

8. A device for determining reactive power support capability of a distribution network, characterized in that: include: A first acquisition module is used to acquire a reactive resource set, wherein the reactive resource set includes all reactive resources on a target feeder in a distribution network, wherein the target feeder is a distribution line connecting the distribution network with a low-voltage side of a main power grid, and the reactive resources are used to provide reactive power to the distribution network; A first determination module is used to determine a first index value of each reactive resource in the reactive resource set, and determine the reactive resource with the largest first index value as the first reactive resource, wherein the first index value represents the ability of the reactive resource to regulate the voltage distribution in the distribution network; a second acquisition module, configured to acquire power flow distribution data corresponding to the first reactive resource, and determine a second index value of the target feeder according to the power flow distribution data, wherein the power flow distribution data is obtained by performing power flow calculation on the distribution network after the output value of reactive power of the first reactive resource is adjusted, and the second index value indicates the ability of the target feeder to regulate voltage fluctuations in the distribution network after the output value of reactive power of the first reactive resource is adjusted; A first updating module, configured to update the accumulated value of reactive power variation amplitude at a gateway device on the target feeder according to the power flow distribution data if the power flow distribution data meets a preset condition and the second index value is within a preset range, the gateway device being located at a physical connection between the main power grid and the distribution network; A second determination module, configured to delete the first reactive resource from the reactive resource set, and determine an update condition according to an output value of reactive power of the first reactive resource in the power flow distribution data, wherein the update condition is used to determine a new first indicator value and new power flow distribution data; A loop module, used to repeat the above steps until a preset stop condition is met, wherein the preset stop condition is any one of the following: the reactive resource set is an empty set, the flow distribution data corresponding to all the remaining reactive resources do not meet the preset condition, and the second indicator value is not within the preset range; The third determination module is used to determine the reactive power that the distribution network can provide to the main power grid according to the accumulated value of the reactive power variation amplitude when the preset stop condition is met.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the method for determining the reactive support capability of a distribution network as described in any one of claims 1 to 7 is implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, a method for determining reactive support capability of a distribution network as claimed in any one of claims 1 to 7 is implemented.

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