Loss regulation and control method and device in distribution network self-healing, equipment and storage medium

Abstract

The invention relates to a loss regulation and control method and device in distribution network self-healing, equipment and a storage medium. The method comprises the following steps: performing mesh generation on a loss equipment node gathering area in a power system to obtain a plurality of generation unit area meshes; determining a grid-connected current intensity coefficient of each subdivision unit area grid under the total grid-connected current intensity according to the resistivity of a plurality of loss devices in the loss device node gathering area; according to each grid-connected current intensity coefficient, determining grid-connected potential distribution of the node gathering area of the loss equipment; and based on the grid-connected potential distribution, a distribution network self-healing loss regulation and control device is adopted to regulate and control the power supply voltage provided by the distributed power supply in the loss equipment node gathering area, so that the loss power of the loss equipment node gathering area is minimized. By adopting the method, the loss of the distributed power supply after grid connection can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of distribution network, and in particular to a loss control method, device, equipment and storage medium in distribution network self-healing. Background Art

[0002] The scale of power grids is also constantly expanding. The distribution network is directly connected to electricity users and plays an important role. When a distribution network failure causes a large-scale power outage, quickly restoring power supply is the primary task of power grid companies. Distribution network self-healing technology is a favorable means to quickly isolate faults and restore power supply according to the optimal solution by using intelligent control of the distribution network.

[0003] As distributed power generation technology matures, distributed power sources are gradually being incorporated into distribution networks. In related technologies, the advantage of incorporating distributed power sources into distribution networks is that it can improve the reliability of distribution network power supply. When a large-scale power outage occurs in the distribution network system, the existence of distributed power sources provides diversity for distribution network self-healing solutions. However, there are also disadvantages to connecting distributed power sources to the grid, namely, the connection of distributed power sources to the grid will cause increased losses.

[0004] Therefore, how to reduce the loss of distributed power sources after grid connection is a technical problem that needs to be solved urgently. Summary of the invention

[0005] Based on this, it is necessary to provide a loss control method, device, equipment and storage medium in distribution network self-healing to address the above technical problems, which can reduce the loss of distributed power sources after grid connection.

[0006] In a first aspect, an embodiment of the present application provides a method for loss control in distribution network self-healing, including:

[0007] Gridding is performed on the loss equipment node cluster area in the power system to obtain multiple grids of unit area;

[0008] According to the resistivity of multiple loss devices in the loss device node cluster area, the grid current intensity coefficient of each subdivided unit area grid under the total grid current intensity is determined;

[0009] According to each grid-connected current intensity coefficient, determine the grid-connected potential distribution in the loss equipment node cluster area;

[0010] Based on the grid potential distribution, the distribution network self-healing loss control device is used to regulate the power supply voltage provided by the distributed power supply in the loss device node cluster area to minimize the power loss in the device node cluster area.

[0011] In one embodiment, a grid is divided for a loss device node cluster area in a power system to obtain a plurality of grids per unit area, including:

[0012] Based on the Cartesian rectangular coordinate system, the three-axis lengths of the loss device node cluster area are obtained;

[0013] Based on the lengths of the three axes, the lossy equipment node cluster area is meshed to obtain multiple meshes of unit area.

[0014] In one embodiment, based on the lengths in the three-axis directions, the lossy device node cluster area is grid-divided to obtain a plurality of grids per unit area, including:

[0015] According to the lengths in the three-axis directions, determine the spacing division lengths of the loss equipment node cluster area in the three-axis directions;

[0016] According to the lengths of each spacing division, the lossy device node cluster area is divided in three-axis directions to obtain a plurality of divided unit area grids.

[0017] In one embodiment, determining the grid-connected current intensity coefficient of each subdivided unit area grid under the total grid-connected current intensity according to the resistivity of multiple loss devices in the loss device node cluster area includes:

[0018] Obtain the power supply current intensity of the power supply point, the distance from the grid connection point to the center of each subdivided unit area grid, the subdivided resistivity of the loss equipment node cluster area, and the maximum value of the distance from all grid connection points to the center of each subdivided unit area grid;

[0019] According to each resistivity, power supply current intensity, each distance, segmentation resistivity and maximum distance, the grid-connected current intensity coefficient of each segmentation unit area grid under the total grid-connected current intensity is determined.

[0020] In one embodiment, determining the grid-connected potential distribution of the loss device node cluster area according to each grid-connected current intensity coefficient includes:

[0021] Taking each unit area grid as a unit point source, the potential and potential derivative caused by each unit point source at the ground measuring point are determined according to each grid-connected current intensity coefficient;

[0022] The potential and potential derivative caused by all unit point sources at the ground measuring point are integrated and calculated to obtain the potential and potential derivative caused by each loss device at the ground measuring point;

[0023] According to the potential caused by each loss device at the ground measuring point and its potential derivative, the grid-connected potential distribution of the loss device node cluster area is determined.

[0024] In one of the embodiments, based on the grid potential distribution, a distribution network self-healing loss control device is used to control the power supply voltage provided by the distributed power supply in the loss device node cluster area, including:

[0025] Determine the operating status of distributed power sources according to the grid-connected potential distribution;

[0026] According to the operating status, the components in the distribution network self-healing loss control device are operated to achieve the control of the power supply voltage.

[0027] In one embodiment, the distribution network self-healing loss control device includes a first distributed power source drive integrated module, a second distributed power source drive integrated module, a first diode and a second diode; according to the operating state, the components in the distribution network self-healing loss control device are operated, including:

[0028] If the operation state is the off steady state, the operation mode is at a low level, the first distributed power drive integrated module and the second distributed power drive integrated module are turned off, the first diode is disconnected, and the second diode is turned on;

[0029] If the operation state is the on transient state, the operation mode is switched from a low level to a high level, the first distributed power source drive integrated module and the second distributed power source drive integrated module are turned on, the first diode is turned on, and the second diode is turned off;

[0030] If the operation state is the open steady state, the operation mode is at a high level, the first distributed power source drive integrated module and the second distributed power source drive integrated module are turned on, the first diode is turned on, and the second diode is turned off;

[0031] If the operation state is the shutdown transient state, the operation mode is switched from a high level to a low level, the first distributed power source drive integrated module and the second distributed power source drive integrated module are shut down, the first diode is disconnected, and the second diode is turned on.

[0032] In a second aspect, the embodiment of the present application further provides a loss control device in distribution network self-healing, including:

[0033] A grid partitioning module is used to partition the loss equipment node cluster area in the power system to obtain multiple partitioned unit area grids;

[0034] A current intensity coefficient determination module is used to determine the grid-connected current intensity coefficient of each subdivided unit area grid under the total grid-connected current intensity according to the resistivity of multiple loss devices in the loss device node cluster area;

[0035] A potential distribution determination module is used to determine the grid-connected potential distribution of the loss device node cluster area according to each grid-connected current intensity coefficient;

[0036] The loss control module is used to control the power supply voltage provided by the distributed power supply in the loss device node cluster area based on the grid potential distribution and adopt the distribution network self-healing loss control device to minimize the loss power in the loss device node cluster area.

[0037] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the method in any one of the embodiments of the first aspect are implemented.

[0038] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method in any one of the embodiments of the first aspect above.

[0039] In a fifth aspect, the present application further provides a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of the method in any one of the embodiments of the first aspect above.

[0040] The loss control method, device, equipment and storage medium in distribution network self-healing provided in the embodiments of the present application first grid-divides the loss device node cluster area in the power system to obtain multiple grids of divided unit area, and then determines the grid current intensity coefficient of each grid of divided unit area under the total grid current intensity according to the resistivity of multiple loss devices in the loss device node cluster area, and then determines the grid potential distribution of the loss device node cluster area according to each grid current intensity coefficient, and finally, based on the grid potential distribution, uses the distribution network self-healing loss control device to control the power supply voltage provided by the distributed power source in the loss device node cluster area to minimize the loss power in the loss device node cluster area. In the method, by gridding the loss device node cluster area, the grid-connected current intensity coefficient of the loss device at each position in the loss device node cluster area is quickly determined, and then the grid-connected potential distribution of the loss device node cluster area is determined based on the grid-connected current intensity coefficient, so that the distribution network self-healing loss control device can realize the control of the power supply voltage provided by the distributed power source in the loss device node cluster area based on the grid-connected potential distribution, thereby minimizing the loss power in the loss device node cluster area, thereby reducing the loss of the distributed power source after grid connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 is an internal structure diagram of a computer device in one embodiment;

[0043] Figure 2 It is a flowchart of a method for loss control in distribution network self-healing in one embodiment;

[0044] Figure 3 A schematic diagram of a mesh generation process in one embodiment;

[0045] Figure 4 A schematic diagram of a flow chart for determining a grid-connected current intensity coefficient in one embodiment;

[0046] Figure 5 A schematic diagram of a process for determining grid-connected potential distribution in one embodiment;

[0047] Figure 6 A schematic diagram of a process for regulating the power supply voltage provided by a distributed power supply in one embodiment;

[0048] Figure 7 A schematic diagram of a distribution network self-healing loss control device in one embodiment;

[0049] Figure 8 It is a schematic diagram of the structure of a loss control device in distribution network self-healing in one embodiment. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0051] The technical background of the embodiments of the present application is described below.

[0052] The scale of power grids is also constantly expanding. The distribution network is directly connected to electricity users and plays an important role. When a distribution network failure causes a large-scale power outage, quickly restoring power supply is the primary task of power grid companies. Distribution network self-healing technology is a favorable means to quickly isolate faults and restore power supply according to the optimal solution by using intelligent control of the distribution network.

[0053] Traditional distribution network self-healing models are mostly single-layer optimization models, which unilaterally consider the safety or economy of distribution network operation and ignore the important level of power load. The distribution network self-healing results are difficult to meet the optimization requirements of power grid companies. In recent years, distributed power generation technology has become increasingly mature, and the integration of distributed power sources into distribution networks has become a trend. After the distributed power sources are connected to the grid, the distribution network flow will be redistributed, and indicators such as node voltage, network loss and power quality in the distribution system will change. The advantage of the grid connection of distributed power sources is that it can improve the reliability of distribution network power supply. When the distribution network system is out of power on a large scale, the existence of distributed power sources provides diversity for the distribution network self-healing solution, while the disadvantage is that it may cause indicators such as node voltage, network loss and power quality to exceed the limit.

[0054] The internal parasitic resistance of the gate of the wide bandgap device is large. When the distributed voltage source is used for driving, the distributed current that can be injected into the gate will be limited by the resistance. It is necessary to use an additional distributed high-voltage power supply to further improve the distributed power supply control switching rate. However, the additional distributed power supply greatly increases the cost of the driver on the one hand, and on the other hand, it is limited by the stability of the gate oxide of the distributed power supply control switch device, and the voltage used for the driver has little room for improvement. The drive circuit based on the distributed current source needs to use an additional inductor to generate a constant current. The additional inductor increases the cost on the one hand, and requires an additional control circuit on the other hand. More importantly, if the grid connection time cannot be well controlled during the process of using the inductor to connect the gate to the grid, it will cause the gate to be over-connected to the grid. Due to the stability of the gate oxide of the distributed power supply control switch device, the excessive gate voltage will damage the reliability of the device, and in severe cases, it will directly damage the device. The existing distributed active drive circuit with complex control logic needs to switch the output voltage or output current in real time according to the working state of the distributed power supply control switch device. Although this method can theoretically provide the best driving performance, its normal operation is extremely dependent on the monitoring of the working state of the distributed power supply control switch device. On the one hand, the additional monitoring hardware will increase the cost, and on the other hand, the measured information needs to be calculated in the microcontroller, which will lead to the occupation of computing resources. The traditional distributed drive circuit only needs one control signal, while the existing distributed current source drive circuit or active drive circuit often requires a large number of auxiliary control signals to ensure the normal operation of the circuit. Too many control signals will not only occupy more microcontroller port resources, but also make the anti-interference ability of the distributed drive circuit worse.

[0055] Based on this, the embodiment of the present application provides a loss control method in distribution network self-healing, which quickly determines the grid-connected current intensity coefficient of the loss equipment at each position in the loss equipment node cluster area by gridding the loss equipment node cluster area, thereby determining the grid-connected potential distribution of the loss equipment node cluster area based on the grid-connected current intensity coefficient, so that the distribution network self-healing loss control device can realize the control of the power supply voltage provided by the distributed power source in the loss equipment node cluster area based on the grid-connected potential distribution, thereby minimizing the loss power in the loss equipment node cluster area, thereby reducing the loss of the distributed power source after grid connection. Of course, the technical solution provided in the embodiment of the present application is not limited to solving only the above-mentioned problems, and there are other technical effects. Please refer to the following embodiment description for details.

[0056] It should be noted that the beneficial effects or technical problems solved by the embodiments of the present application are not limited to this one, but may also include other implicit or related problems. For details, please refer to the description of the following embodiments.

[0057] The following loss control method in the distribution network self-healing provided in the embodiment of the present application can be applied to a computer device. The computer device can be a server, and its internal structure diagram can be as follows: Figure 1 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, memory and input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database of the computer device is used to store data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a loss control method in distribution network self-healing is implemented. Those skilled in the art can understand that Figure 1 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0058] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0059] In an exemplary embodiment, Figure 2 As shown, a loss control method in distribution network self-healing is provided, and the method is applied to Figure 1 The computer device in the example is used to illustrate, including the following steps 201 to 204. Among them:

[0060] S201, gridding the loss equipment node cluster area in the power system to obtain a plurality of grids per unit area.

[0061] The lossy equipment node cluster area refers to a concentrated area of ​​nodes connected by multiple devices with power loss in the power system.

[0062] In the embodiment of the present application, the lossy equipment node cluster area is firstly grid-divided to obtain a plurality of divided grids, that is, grids per unit area.

[0063] Exemplarily, the grid division method for the loss device node cluster area in the power system can be to obtain the division spacing of the loss device node cluster area in different axial directions, and then use each division spacing to divide the loss device node cluster area to obtain multiple division unit area grids. The different axial directions include the X-axis direction, the Y-axis direction and the Z-axis direction.

[0064] In practical applications, when the lossy device node cluster area is segmented, the lossy device node cluster area is segmented in the corresponding axis direction based on each segmentation spacing. For example, if the segmentation spacing is in the X-axis direction, the X-axis direction of the lossy device node cluster area is segmented based on the segmentation spacing.

[0065] S202, determining the grid-connected current intensity coefficient of each subdivided unit area grid under the total grid-connected current intensity according to the resistivity of multiple lossy devices in the lossy device node cluster area.

[0066] The resistivity of lossy equipment is a key parameter for energy loss caused by the resistance characteristics of the material itself in various energy-consuming equipment (such as transmission lines, transformers, reactors, etc.) in the power system. Its core is to describe the ability of equipment materials to hinder current, which directly affects the active power loss during power transmission or conversion. The grid-connected current intensity coefficient refers to the key parameter used to describe or control the amplitude of the grid-connected current during the grid-connected process of distributed power sources. Its function is to ensure that the grid-connected current is synchronized with the grid voltage and meets the power quality requirements, such as harmonic distortion and phase matching.

[0067] In an embodiment of the present application, when determining the grid current intensity coefficient of each subdivided unit area grid under the total grid current intensity, a calculation model for calculating the grid current intensity coefficient of each subdivided unit area grid can be obtained, and the total grid current intensity can be obtained, and then for each subdivided unit area grid, based on the calculation model, the resistivity of each loss equipment and the total grid current intensity, the grid current intensity coefficient of the subdivided unit area grid under the total grid current intensity is determined.

[0068] S203, determining the grid-connected potential distribution of the loss device node cluster area according to each grid-connected current intensity coefficient.

[0069] Grid-connected potential distribution refers to the voltage (potential) distribution state of the lossy equipment node cluster area in the power system when the distributed power generation is connected to the power grid.

[0070] Exemplarily, according to each grid-connected current intensity coefficient, the method for determining the grid-connected potential distribution of the loss device node cluster area can be to obtain the relationship between the current intensity coefficient and the grid-connected potential distribution, and then based on the relationship between the current intensity coefficient and the grid-connected potential distribution, introduce the grid-connected current intensity coefficient of each subdivided unit area grid under the total grid-connected current intensity into the relationship to obtain the grid-connected potential distribution of the loss device node cluster area.

[0071] S204, based on the grid potential distribution, a distribution network self-healing loss control device is used to control the power supply voltage provided by the distributed power source in the loss device node cluster area to minimize the loss power in the loss device node cluster area.

[0072] The distribution network self-healing loss control device refers to an automated device or system used in the distribution network. Its core function is to quickly detect, locate, and isolate the faulty area when a fault occurs in the distribution network, and automatically restore power supply to the non-faulty area. At the same time, it reduces line losses by regulating the power supply voltage provided by the distributed power source.

[0073] In an embodiment of the present application, after determining the grid-connected potential distribution of the loss equipment node cluster area, the distribution network self-healing loss control device is used to regulate the power supply voltage provided by the distributed power source in the loss equipment node cluster area in combination with the grid-connected potential distribution to minimize the loss power in the loss equipment node cluster area.

[0074] In practical applications, different grid-connected potential distributions correspond to different control operations of the distribution network self-healing loss control device. That is, no matter whether the grid-connected potential distribution in the loss equipment node cluster area is stable or fluctuating, there are different control operations to minimize the loss power in the loss equipment node cluster area.

[0075] In the loss control method in distribution network self-healing provided in the embodiment of the present application, the loss device node cluster area in the power system is first gridded to obtain a plurality of grids per unit area, and then the grid current intensity coefficient of each grid per unit area under the total grid current intensity is determined according to the resistivity of the plurality of loss devices in the loss device node cluster area, and then the grid potential distribution of the loss device node cluster area is determined according to each grid current intensity coefficient, and finally, based on the grid potential distribution, the distribution network self-healing loss control device is used to control the power supply voltage provided by the distributed power source in the loss device node cluster area to minimize the loss power in the loss device node cluster area. In the method, by gridding the loss device node cluster area, the grid-connected current intensity coefficient of the loss device at each position in the loss device node cluster area is quickly determined, and then the grid-connected potential distribution of the loss device node cluster area is determined based on the grid-connected current intensity coefficient, so that the distribution network self-healing loss control device can realize the control of the power supply voltage provided by the distributed power source in the loss device node cluster area based on the grid-connected potential distribution, thereby minimizing the loss power in the loss device node cluster area, thereby reducing the loss of the distributed power source after grid connection.

[0076] Based on the above embodiment, an embodiment is provided to illustrate the above mesh generation process.

[0077] In an exemplary embodiment, Figure 3 As shown in the figure, the loss equipment node cluster area in the power system is grid-divided to obtain multiple grids per unit area, including:

[0078] S301, based on a Cartesian rectangular coordinate system, obtaining the three-axis lengths of the lossy device node cluster area.

[0079] In the embodiment of the present application, a Cartesian rectangular coordinate system is used, and the C axis of the coordinate system is taken vertically upward. The directions of the A axis and the B axis are determined according to the right-hand screw method, and then the spatial distribution range of the loss device node cluster area in the directions of the coordinate axes A, B, and C is determined, and the three-axis length of the loss device node cluster area is obtained.

[0080] S302, based on the lengths in the three-axis directions, mesh the lossy equipment node cluster area to obtain a plurality of meshes per unit area.

[0081] Exemplarily, according to the lengths in the three-axis directions, the spacing division lengths of the lossy device node cluster area in the three-axis directions are determined; according to each spacing division length, the lossy device node cluster area is divided in the three-axis directions respectively to obtain a plurality of divided unit area grids.

[0082] In the embodiment of the present application, each spacing segmentation length d satisfies d≤L / 10, where L is the length of the loss device node cluster area in the three-axis direction. After obtaining the spacing segmentation length of the loss device node cluster area in the three-axis direction, a regular rectangular grid is used to segment the loss device node cluster area into M grid nodes at a certain spacing in the A direction, into N grid nodes at a certain spacing in the B direction, and into Q grid nodes at a certain spacing in the C direction, and the result is segmented into (M-1)×(N-1)×(Q-1) grid units.

[0083] In the loss control method in the distribution network self-healing provided in the embodiment of the present application, firstly, based on the Cartesian rectangular coordinate system, the three-axis length of the loss device node cluster area is obtained, and then based on the three-axis length, the loss device node cluster area is gridded to obtain a plurality of grids of divided unit area. In this method, an optional way is provided for grid division; the length of the loss device node cluster area in the three-axis direction is obtained through the coordinate system, and then the grid division of the loss device node cluster area is realized based on the three-axis length, which provides a data basis for determining the grid potential distribution, so that the loss control of the distributed power supply grid connection can be completed based on the grid potential distribution.

[0084] Based on any of the aforementioned embodiments, an embodiment is provided to illustrate the process of determining the grid-connected current intensity coefficient.

[0085] In an exemplary embodiment, Figure 4 As shown, according to the resistivity of multiple loss devices in the loss device node cluster area, the grid-connected current intensity coefficient of each subdivided unit area grid under the total grid-connected current intensity is determined, including:

[0086] S401, obtaining the power supply current intensity of the power supply point, the distance from the grid connection point to the center of each subdivided unit area grid, the subdivided resistivity of the loss device node cluster area, and the maximum value of the distance from all grid connection points to the center of each subdivided unit area grid.

[0087] S402, determining the grid-connected current intensity coefficient of each grid per unit area under the total grid-connected current intensity according to each resistivity, power supply current intensity, each distance, the split resistivity and the maximum distance.

[0088] In the embodiment of the present application, the grid-connected current intensity coefficient is determined by acquiring parameter information related to the grid-connected current intensity coefficient, and then based on the parameter information and in combination with the grid-connected current intensity coefficient calculation formula.

[0089] Exemplarily, for any subdivided unit area grid, the following formula (1) is used to determine the grid current intensity coefficient of the subdivided unit area grid under the total grid current intensity.

[0090] (1)

[0091] in, Indicates the power supply current intensity of the power supply point; Indicates the point of connection to the The distance between the centers of the meshes of the subdivided unit area; Indicates the resistivity of lossy equipment; Represents the split resistivity of the lossy device node cluster area, ; It represents the maximum value of the distance from all grid connection points to the center of the subdivided unit area grid; Indicates the distance from the grid connection point to the center of the loss equipment node cluster area; Indicates the distance from the boundary node of the lossy device node cluster to its center.

[0092] It should be noted that, in the embodiment of the present application, the resistivity of the regular lossy device node cluster area may vary with the position of the grid of the segmented unit.

[0093] In the loss control method in the distribution network self-healing provided in the embodiment of the present application, the power supply current intensity of the power supply point, the distance from the grid connection point to the center of each subdivided unit area grid, the subdivided resistivity of the loss device node cluster area, and the maximum distance from all grid connection points to the center of each subdivided unit area grid are first obtained, and then the grid connection current intensity coefficient of each subdivided unit area grid under the total grid connection current intensity is determined according to each resistivity, power supply current intensity, each distance, subdivided resistivity and maximum distance. In this method, an optional method is provided for the rapid determination of the grid connection current intensity coefficient. Through the calculation of the grid connection current intensity coefficient, the grid connection potential distribution of the loss device node cluster area can be further determined, thereby realizing the control of the power supply voltage provided by the distributed power supply, and reducing the loss of the distributed power supply after the grid connection.

[0094] Based on the above embodiment, an embodiment is provided to illustrate the process of determining the grid-connected potential distribution.

[0095] In an exemplary embodiment, Figure 5 As shown in the figure, according to each grid-connected current intensity coefficient, the grid-connected potential distribution of the loss equipment node cluster area is determined, including:

[0096] S501, taking each subdivided unit area grid as a unit point source, and determining the potential and potential derivative caused by each unit point source at a ground measuring point according to each grid-connected current intensity coefficient.

[0097] In this embodiment, based on the grid-connected current intensity coefficient, the following formula (2) is used to determine the potential and potential derivative caused by each unit point source at the ground measuring point.

[0098] (2)

[0099] in, , Represents the unit area grid Considered as a unit point source The potential value caused by the ground observation point and its derivative value in the A direction; PI=3.1415926; Indicates The area of ​​the mesh unit is from the center of the grid point to the The distance between the ground measuring points; Respectively represent The A-axis position of the center coordinates of the grid point source on the first mesh unit surface and the A-axis position of ground measuring points, Indicates taking the absolute value.

[0100] S502, performing integral calculation on the potentials and potential derivatives caused by all unit point sources at the ground measuring point, and obtaining the potentials and potential derivatives caused by each loss device at the ground measuring point.

[0101] In the embodiment of the present application, the following formula (3) is used to integrate and calculate the potential and potential derivative caused by all unit point sources at the ground measuring points.

[0102] (3)

[0103] in, and They represent the lossy equipment node clustering areas in The total potential value caused by the ground observation points and its derivative value in the A direction; Represents the total number of mesh units in the lossy equipment node cluster area.

[0104] S503, determining the grid-connected potential distribution of the loss device node cluster area according to the potential and potential derivative caused by each loss device at the ground measurement point.

[0105] After obtaining the potential and potential derivative caused by each loss device at the ground measuring point, multiple potential values ​​and potential derivative values ​​can be obtained based on the change over time. The potential curve is calculated based on the multiple potential values, and the potential derivative curve in the direction of coordinate axis A is calculated based on the multiple potential derivative values, thereby obtaining the grid-connected potential distribution in the loss device node cluster area.

[0106] In the loss control method in the distribution network self-healing provided in the embodiment of the present application, firstly, each subdivided unit area grid is taken as a unit point source, and the potential and potential derivative caused by each unit point source at the ground measuring point are determined according to each grid-connected current intensity coefficient, and then the potential and potential derivative caused by all unit point sources at the ground measuring point are integrated and calculated to obtain the potential and potential derivative caused by each loss device at the ground measuring point, and then the grid-connected potential distribution of the loss device node cluster area is determined according to the potential and potential derivative caused by each loss device at the ground measuring point. In this method, by calculating the potential and potential derivative values ​​caused by the loss device at the ground measuring point, the grid-connected potential distribution of the loss device node cluster area is obtained based on this data, which provides a direct basis for the power supply voltage control performed by the distribution network self-healing loss control device, and provides data support for the reduction of losses in the distribution network self-healing.

[0107] Based on the above embodiment, an embodiment is provided to illustrate the process of regulating the power supply voltage provided by the distributed power supply.

[0108] In an exemplary embodiment, Figure 6 As shown, based on the grid potential distribution, the distribution network self-healing loss control device is used to control the power supply voltage provided by the distributed power supply in the loss equipment node cluster area, including:

[0109] S601, determining the operating state of the distributed power source according to the grid-connected potential distribution.

[0110] In the embodiment of the present application, the operating state of the distributed power source includes a shutdown steady state, an on transient state, an on steady state and a shutdown transient state. There is a corresponding relationship between the grid-connected potential distribution and the operating state of the distributed power source.

[0111] When the steady state is turned off, the potential distribution feature is that the potential of the nodes in the cluster area is close to the grid reference voltage (such as 10kV bus voltage or 0.4kV low-voltage side voltage), without obvious fluctuations. Since the distributed power source is not connected, the active and reactive losses of the loss equipment (such as transformers and lines) are mainly caused by the load current, and the potential curve is smooth and stable. The judgment basis is that the voltage at the monitoring point is stable within the rated value ±5%, and there is no active / reactive power injection. The voltage difference between the nodes of the loss equipment is small, which conforms to the voltage distribution law during normal operation of the power grid.

[0112] When the steady state is turned on, the potential distribution feature is that after the distributed power source is connected to the grid, the potential of the nodes in the cluster area is raised due to the injection of power, especially at the nodes near the power source (such as the low-voltage side of the step-up transformer or the T-connected line). The voltage rise is related to the power output, line impedance and load level, which may cause the local voltage to exceed the upper limit (such as exceeding 1.07 times the rated voltage). The judgment basis is that the voltage at the grid connection point is continuously higher than the reference value and the active power output is stable (such as the photovoltaic power station operating at more than 80% of the rated power). The active loss of the loss equipment may be reduced due to the reverse transmission of the power supply, or even negative loss may occur (such as reverse line current).

[0113] During the transient state of opening, the potential distribution feature is that at the moment of power closing, due to the impact current and voltage surge, the potential of the nodes in the cluster area may overshoot for a short time (such as 1.1~1.2 times the rated voltage). The voltage fluctuation lasts for a short time (milliseconds to seconds), and then gradually tends to a steady state. The judgment basis is to monitor the rapid rise and fall of the voltage amplitude, accompanied by high-frequency oscillation or transient harmonics. The active power rises rapidly from 0, and the reactive power may fluctuate due to the inverter control strategy.

[0114] During the shutdown transient, the potential distribution feature is that at the moment of power disconnection, the potential of the nodes in the cluster area may drop suddenly due to the sudden increase in load current (such as 0.8~0.9 times the rated voltage). If the power capacity is large, it may cause local voltage instability or trigger self-excitation of adjacent equipment (such as motors). The judgment basis is that the voltage amplitude gradually recovers after a sudden drop, accompanied by a sudden drop in active power to zero. If there is an energy storage device, it may be observed that the energy storage system responds quickly to maintain voltage stability.

[0115] S602, operating the components in the distribution network self-healing loss control device according to the operating status to achieve control of the power supply voltage.

[0116] In the embodiment of the present application, the distribution network self-healing loss control device includes a first distributed power supply drive integrated module Bon, a second distributed power supply drive integrated module Boff, a first diode Don and a second diode Doff.

[0117] In practical applications, different operating states correspond to different operations of components in the distribution network self-healing loss control device.

[0118] Exemplarily, if the operating state is the off steady state, the operating mode is at a low level, the first distributed power drive integrated module and the second distributed power drive integrated module are turned off, and the first diode is disconnected, and the second diode is turned on. In the off steady state, the operating mode is at a low level, the distributed power drive integrated module Bon and Boff outputs are low level outputs, the distributed power control switch Don is disconnected and Doff is turned on.

[0119] If the operation state is the opening transient state, the operation mode is switched from low level to high level, the first distributed power drive integrated module and the second distributed power drive integrated module are turned on, and the first diode is turned on, and the second diode is turned off. In the opening transient state, the operation mode is switched from low level to high level, the Bon and Boff outputs of the distributed power drive integrated module are high level outputs, the distributed power control switch Don is turned on, and Doff is turned off.

[0120] If the operation state is the open steady state, the operation mode is at a high level, the first distributed power drive integrated module and the second distributed power drive integrated module are turned on, and the first diode is turned on and the second diode is turned off. In the open steady state, the operation mode is at a high level, the distributed power drive integrated module Bon and Boff outputs are high level outputs, the distributed power control switch Don is turned on and Doff is turned off.

[0121] If the operating state is the shutdown transient state, the operating mode is switched from high level to low level, the first distributed power drive integrated module and the second distributed power drive integrated module are shut down, and the first diode is disconnected and the second diode is turned on. In the shutdown dynamic state, the operating mode is switched from high level to low level, the Bon and Boff outputs of the distributed power drive integrated module are low level, Don is turned off and Doff is turned on.

[0122] like Figure 7 The figure shows a schematic diagram of a distribution network self-healing loss control device. The distribution network self-healing loss control device can be divided into an opening part and a closing part. The distributed power supply control switch device is equivalent to a resistor and a capacitor in series, where the resistor is the internal parasitic resistance of the gate of the distributed power supply control switch device, and the capacitor is the input capacitance of the distributed power supply control switch device; the control signal input unit of the operation mode microcontroller, the high level represents the opening of the device, and the low level represents the closing of the device; the power supply is a DC power supply module with 15V and 5V outputs, which is responsible for providing power for other parts of the circuit; the signal isolation unit is used to electrically isolate the microcontroller from the main power device; Bon and Boff are non-isolated distributed power drive integrated modules, which are used to control the working state of the signal switching circuit according to the operation mode; Don and Doff are diodes, and Con and Coff are capacitors; Don, Con, Doff and Coff constitute a bootstrap structure, which is responsible for providing a faster driving rate and reducing driving loss when the driving circuit is working; Ron and Roff are driving resistors, which are used to adjust the driving rate and balance the distributed power supply control switch loss and transient overvoltage; metal oxide semiconductor field effect transistors (Don is E-type DOSFET, Doff is P-type DOSFET) are used to control the circuit working state and switch.

[0123] The operation mode signal is the output control signal of the microcontroller. The high level indicates that the distributed power supply control switch device needs to be turned on, and the low level indicates that the distributed power supply control switch device needs to be turned off. The distributed power supply control switch device box represents the actual distributed power supply control switch device, which is generally a silicon carbide field effect tube or a silicon IGBT, which can be simply equivalent through a capacitor and resistor series structure. The main function of signal isolation is to electrically isolate the control signal from the main circuit to protect the control circuit. The isolated power supply is responsible for providing power to the operation of the entire circuit. Generally, a 15V and a 5V power supply module are required. The specific voltage can be fine-tuned according to application requirements. Bon and Boff are distributed power supply drive integrated modules. When the operation mode is high, the output of the distributed power supply drive integrated module will be connected to the high potential of its power supply. When the operation mode signal is low, the output of the distributed power supply drive integrated module will be connected to the ground potential of its power supply. These two component loads switch the circuit working state according to the control signal. Don is an EDOS and Doff is a PDOS. These two components are related to the switching of the circuit working state. Con and Coff are capacitors, Don and Doff are diodes, which together form a bootstrap structure to double the voltage of the power supply during the output transient state to increase the switching rate of the distributed power supply. Ron and Roff are gate resistors, which are used to adjust the switching rate of the distributed power supply.

[0124] The specific operation mode of the distribution network self-healing loss control device provided in the embodiment of the present application is as follows:

[0125] In the shutdown steady state, since the operation mode is at a low level at this time, the outputs of the distributed power drive integrated module Bon and Boff are also low-level outputs, so the distributed power control switch Don is disconnected and Doff is turned on. At this time, the open part is in the pre-grid state, and Con is connected to the grid to 15V to prepare for the next open dynamic. The charge on Coff is completely released in the previous stage, so the diode Doff is turned on. At this time, the gate voltage of the distributed power control switch device (the voltage across gs) is -5V, and the distributed power control switch device is in a reliable shutdown state.

[0126] During the turn-on dynamic, the operation mode is switched from low level to high level, and the outputs of the distributed power drive integrated module Bon and Boff are also high level outputs, so the distributed power control switch Don is turned on and Doff is turned off. At this time, the shutdown part is separated from the distributed power control switch device and enters the pre-grid state. Coff is connected to the grid to 5V to prepare for the subsequent shutdown dynamic. Since the voltage across the capacitor cannot change suddenly, the turn-on part will be bootstrapped to 30V at this time, and the voltage will gradually decrease as the driver provides current to the distributed power control switch device. If the capacitor capacitance is reasonably designed so that the stored voltage is equal to the total gate charge of the device, then at the end of the turn-on, the charge on Con will be automatically released completely, and the gate will not be over-connected to the grid.

[0127] When the steady state is turned on, since the operation mode is at a high level at this time, the outputs of the distributed power drive integrated module Bon and Boff are also high level outputs, so the distributed power control switch Don is turned on and Doff is turned off. At this time, the shutdown part is in the pre-grid state, Coff is connected to the grid to 5V to prepare for the next shutdown, and since the charge on Con is completely released in the previous stage, the diode Don is turned on. At this time, the gate voltage of the distributed power control switch device is 15V, and the distributed power control switch device is in a reliable open state.

[0128] During the shutdown dynamic, the operation mode switches from high level to low level, and the outputs of the distributed power drive integrated module Bon and Boff are also low level, so Don is turned off and Doff is turned on. At this time, the open part is separated from the distributed power control switch device and enters the pre-grid state. Con is connected to the grid to 15V to prepare for the subsequent opening. Since the voltage across the capacitor cannot change suddenly, the shutdown voltage will be bootstrapped to -10V at this time, and the voltage will gradually decrease as the shutdown process proceeds. If the capacitor capacitance is reasonably designed so that the stored voltage is equal to the total gate charge of the device, then at the end of the shutdown, the charge on Coff will be automatically released completely, and the gate will not be over-connected to the grid.

[0129] Due to the use of the bootstrap structure, the drive circuit in the embodiment of the present application can output twice the drive voltage during the distributed power supply regulation and switching process without using an additional power supply, thereby greatly improving the distributed power supply regulation and switching rate. The embodiment of the present application controls the capacitance of Con and Coff to ensure that at the end of the distributed power supply regulation and switching process, the output voltage of the drive circuit is automatically reduced to the power supply voltage, avoiding over-grid connection, and no additional control signal is required.

[0130] The output structure used in the embodiment of the present application is combined with reasonable control, so that the gate driver can temporarily output twice the power supply voltage, and the output voltage will gradually decrease as the distributed power supply regulation switching process proceeds, and finally automatically decay to the power supply output voltage at the end of the distributed power supply regulation switching process, which will not cause the gate to be over-connected to the grid and damage the device. The drive circuit in the embodiment of the present application does not require an additional power supply, does not require an additional control signal, only requires a few low-cost low-voltage devices, and has an adaptive characteristic that will not damage the device when the working conditions change. Using the drive circuit structure in the embodiment of the present application to replace the traditional drive can greatly reduce the distributed power supply regulation switch loss of the converter, improve efficiency, and save energy.

[0131] In the loss control method in the distribution network self-healing provided in the embodiment of the present application, the operating state of the distributed power source is first determined according to the grid potential distribution, and then the components in the distribution network self-healing loss control device are operated according to the operating state to achieve the control of the power supply voltage. In this method, different grid potential distributions correspond to different operating states of distributed power sources, and thus correspond to different control operations of the distribution network self-healing loss control device. Based on this, the current operating state of the distributed power source is first determined based on the grid potential distribution, and then the components in the distribution network self-healing loss control device are operated based on the operating state, so as to achieve the control of the power supply voltage provided by the distributed power source, thereby reducing the loss control in the distribution network self-healing.

[0132] In addition, in an exemplary embodiment, an embodiment is provided to illustrate the loss control method in the distribution network self-healing adapted to the new power system in the embodiment of the present application.

[0133] S1, for the lossy equipment node cluster area, unit area grids are used for segmentation, and the grid-connected node cluster area is converted into multiple unit area grids.

[0134] A Cartesian rectangular coordinate system is adopted, and the C axis of the coordinate system is taken vertically upward. The directions of the A axis and the B axis are determined according to the right-hand screw method. The spatial distribution range of the regular lossy equipment in the directions of the coordinate axes A, B, and C is determined. Given the lengths of the three axes of the coordinate system of the regular lossy equipment, a regular rectangular grid is used to divide the lossy equipment into D grid nodes in the A direction at a certain interval, into E grid nodes in the B direction at a certain interval, and into F grid nodes in the C direction at a certain interval. The regular lossy equipment node cluster area is obtained, which is divided into (D-1)×(E-1)×(F-1) grid units, and the (D-1)×(E-1)×(F-1) grid units correspond to (D-1)×(E-1)×(F-1) unit point power sources.

[0135] Furthermore, the spacing division length d satisfies d≤L / 10, where L is the spread length of the regular lossy device in each coordinate axis direction.

[0136] S2, calculating the grid-connected current intensity coefficients respectively allocated to a plurality of grids of unit area under the total grid-connected current intensity condition.

[0137] According to formula (1), the power supply current intensity coefficient of the grid point of the regular lossy equipment node cluster area is calculated when the power supply current intensity is connected to the grid; the resistivity of the regular lossy equipment node cluster area can change with the position of the grid of the grid.

[0138] S3, taking each subdivided unit area as a unit point source, the grid-connected potential integral calculation of all subdivided grid unit point sources is performed to obtain the grid-connected potential distribution of the lossy equipment node cluster area.

[0139] Based on the calculated power supply current intensity coefficient of the grid point of the regular lossy equipment node cluster area, the potential and potential derivative caused by the power supply of each grid point of the subdivision unit at the ground measuring point are calculated according to formula (2); the potential and potential derivative values ​​caused by the power supply of all grid points of the subdivision unit at the ground measuring point are integrated and calculated according to formula (3) to obtain the potential and potential derivative values ​​caused by the regular lossy equipment at the ground measuring point.

[0140] S4, based on the grid-connected potential distribution of the lossy equipment node cluster area, the power supply voltage provided by the distributed power source is regulated by the distribution network self-healing loss regulation device to minimize the power loss in the lossy equipment node cluster area.

[0141] In the shutdown steady state, the operating mode is at a low level, the distributed power drive integrated module Bon and Boff outputs are low level outputs, the distributed power control switch Don is disconnected and Doff is turned on; in the opening dynamic, the operating mode switches from a low level to a high level, the distributed power drive integrated module Bon and Boff outputs are high level outputs, the distributed power control switch Don is turned on and Doff is disconnected; in the opening steady state, the operating mode is at a high level, the distributed power drive integrated module Bon and Boff outputs are high level outputs, the distributed power control switch Don is turned on and Doff is disconnected; in the shutdown dynamic, the operating mode switches from a high level to a low level, the distributed power drive integrated module Bon and Boff outputs are low level, Don is turned off and Doff is turned on.

[0142] Furthermore, the distribution network self-healing loss control device can be divided into an opening and closing part; the distributed power control switch device is equivalent to a resistor and a capacitor in series, the resistor is the internal parasitic resistance of the gate of the distributed power control switch device, and the capacitor is the input capacitance of the distributed power control switch device; the control signal input unit of the operation mode microcontroller, the high level represents the opening of the device, and the low level represents the closing of the device; the power supply is a DC power module with 15V and 5V outputs, which is responsible for providing power for other parts in the circuit;

[0143] The signal isolation unit is used to electrically isolate the microcontroller from the main power device; Bon and Boff are non-isolated distributed power drive integrated modules, which are used to control the working state of the signal switching circuit according to the operating mode; Don and Doff are diodes, and Con and Coff are capacitors. Don, Con, Doff and Coff form a bootstrap structure, which is responsible for providing a faster driving speed and reducing driving losses when the driving circuit is working; Ron and Roff are driving resistors, which are used to adjust the driving speed and balance the distributed power supply regulation switch loss and transient overvoltage.

[0144] Furthermore, the operation method of the distribution network self-healing loss control device includes:

[0145] (1) The operation mode signal is the output control signal of the microcontroller. A high level indicates that the distributed power control switch device needs to be turned on, and a low level indicates that the distributed power control switch device needs to be turned off. The distributed power control switch device box represents the actual distributed power control switch device.

[0146] (2) Signal isolation: electrically isolate the control signal from the main circuit to protect the control circuit.

[0147] (3) The isolated power supply is responsible for providing power to the entire circuit;

[0148] (4) Bon and Boff are distributed power drive integrated modules. When the operation mode is high, the output of the distributed power drive integrated module will be connected to the high potential of its power supply. When the operation mode signal is low, the output of the distributed power drive integrated module will be connected to the ground potential of its power supply. These two component loads switch the circuit working state according to the control signal;

[0149] Furthermore, the operation method of the distribution network self-healing loss control device also includes:

[0150] Don is an EDOS, Doff is a PDOS; Con, Coff are capacitors, Don, Doff are diodes, which are used to double the voltage of the power supply during output transient to increase the distributed power supply regulation switching rate; Ron, Roff are gate resistors, which are used to adjust the distributed power supply regulation switching rate.

[0151] The embodiment of the present application also provides a loss control system in the self-healing of a distribution network adapted to a new type of power system, the system comprising:

[0152] The unit area grid division module is used to divide the lossy device node cluster area into unit area grids and convert the grid-connected node cluster area into multiple unit area grids; the grid current intensity coefficient calculation module is used to calculate the grid current intensity coefficients allocated to multiple divided unit area grids under the total grid current intensity condition; the grid potential distribution acquisition module of the lossy device node cluster area is used to take each divided unit area as a unit point source, perform grid potential integral calculation of all divided grid unit point sources, and obtain the grid potential distribution of the lossy device node cluster area; the control module is used to use the distribution network self-healing loss control device to control the power supply voltage provided by the distributed power supply according to the obtained grid potential distribution of the lossy device node cluster area, so as to minimize the power loss in the lossy device node cluster area.

[0153] In this embodiment, the node voltage, network loss, power quality and other indicators that may exceed the limit in the self-healing scheme of the distributed power distribution network are correctly regulated. The driving circuit in the embodiment of the present application can output twice the driving voltage during the distributed power supply regulation and switching process without using an additional power supply, thereby greatly improving the distributed power supply regulation and switching rate. By controlling the capacitance values ​​of Con and Coff, the embodiment of the present application can ensure that at the end of the distributed power supply regulation and switching process, the output voltage of the driving circuit is automatically reduced to the power supply voltage, avoiding over-grid connection, and no additional control signal is required.

[0154] Compared with voltage source type drive, the embodiment of the present application can significantly improve the distributed power supply control switch rate and reduce the distributed power supply control switch loss; compared with current source type drive, the embodiment of the present application has the characteristics of self-adaptation, does not require additional timing control, does not have the risk of over-grid loss of distributed power supply control switch devices, and does not require additional inductance; compared with complex active drive, the embodiment of the present application has the advantages of simple structure and high reliability. In addition, the embodiment of the present application overcomes the limitation of the large gate internal parasitic resistance of wide bandgap devices on the distributed power supply control switch rate, and can significantly reduce the distributed power supply control switch loss. The embodiment of the present application can be simple in structure and good in stability.

[0155] The embodiment of the present application solves the problem of the lack of numerical calculation methods for the grid-connected potential of traditional lossy equipment. The algorithm has a simple structure, a simple implementation process, a reasonable design, and stable and reliable calculation results. The embodiment of the present application designs a special grid-connected current intensity calculation formula for the power supply coefficient of the grid unit point of the lossy equipment, and adopts the potential anomaly integral algorithm caused by the power supply of the grid unit point, which realizes the feasibility and accuracy of the numerical calculation of the grid-connected potential for lossy equipment.

[0156] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0157] Based on the same inventive concept, the embodiment of the present application also provides a loss control device in distribution network self-healing for implementing the loss control method in distribution network self-healing involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more embodiments of the loss control device in distribution network self-healing provided below can refer to the limitations of the loss control method in distribution network self-healing above, and will not be repeated here.

[0158] In an exemplary embodiment, Figure 8 As shown, a loss control device 1 in distribution network self-healing is provided, comprising: a grid division module 10, a current intensity coefficient determination module 20, a potential distribution determination module 30 and a loss control module 40, wherein:

[0159] A grid partitioning module 10 is used to partition the loss equipment node cluster area in the power system into grids to obtain a plurality of partitioned unit area grids;

[0160] The current intensity coefficient determination module 20 is used to determine the grid-connected current intensity coefficient of each subdivided unit area grid under the total grid-connected current intensity according to the resistivity of multiple loss devices in the loss device node cluster area;

[0161] A potential distribution determination module 30, for determining the grid potential distribution of the loss device node cluster area according to each grid current intensity coefficient;

[0162] The loss control module 40 is used to control the power supply voltage provided by the distributed power supply in the loss device node cluster area based on the grid potential distribution and adopt the distribution network self-healing loss control device to minimize the loss power in the loss device node cluster area.

[0163] In one embodiment, the mesh generation module 10 is further used for:

[0164] Based on the Cartesian rectangular coordinate system, the three-axis lengths of the lossy equipment node cluster area are obtained; based on the three-axis lengths, the lossy equipment node cluster area is grid-divided to obtain a plurality of grids of divided unit area.

[0165] In one embodiment, the mesh generation module 10 is further used for:

[0166] According to the lengths in the three-axis directions, the spacing division lengths of the lossy equipment node cluster area in the three-axis directions are determined; according to each spacing division length, the lossy equipment node cluster area is divided in the three-axis directions respectively to obtain a plurality of division unit area grids.

[0167] In one embodiment, the current intensity coefficient determination module 20 is further configured to:

[0168] Obtain the power supply current intensity of the power supply point, the distance from the grid connection point to the center of each subdivided unit area grid, the subdivided resistivity of the loss equipment node cluster area, and the maximum distance from all grid connection points to the center of each subdivided unit area grid; determine the grid current intensity coefficient of each subdivided unit area grid under the total grid current intensity based on the resistivity, power supply current intensity, distance, subdivided resistivity and maximum distance.

[0169] In one embodiment, the potential distribution determination module 30 is further used for:

[0170] Taking each subdivided unit area grid as a unit point source, the potential and potential derivative caused by each unit point source at the ground measuring point are determined according to the grid-connected current intensity coefficient; the potential and potential derivative caused by all unit point sources at the ground measuring point are integrated and calculated to obtain the potential and potential derivative caused by each loss device at the ground measuring point; based on the potential and potential derivative caused by each loss device at the ground measuring point, the grid-connected potential distribution of the loss device node cluster area is determined.

[0171] In one embodiment, the loss control module 40 is further configured to:

[0172] The operating state of the distributed power source is determined according to the grid-connected potential distribution; according to the operating state, the components in the distribution network self-healing loss control device are operated to achieve the control of the power supply voltage.

[0173] In one embodiment, the loss control module 40 is further configured to:

[0174] If the operating state is the shutdown steady state, the operating mode is at a low level, the first distributed power drive integrated module and the second distributed power drive integrated module are shut down, the first diode is disconnected, and the second diode is turned on; if the operating state is the turn-on transient state, the operating mode is switched from a low level to a high level, the first distributed power drive integrated module and the second distributed power drive integrated module are opened, the first diode is turned on, and the second diode is disconnected; if the operating state is the turn-on steady state, the operating mode is at a high level, the first distributed power drive integrated module and the second distributed power drive integrated module are opened, the first diode is turned on, and the second diode is disconnected; if the operating state is the shutdown transient state, the operating mode is switched from a high level to a low level, the first distributed power drive integrated module and the second distributed power drive integrated module are shut down, the first diode is disconnected, and the second diode is turned on.

[0175] Each module in the loss control device in the above distribution network self-healing can be implemented in whole or in part by software, hardware and their combination. Each module can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to each module above.

[0176] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0177] Gridding is performed on the loss equipment node cluster area in the power system to obtain multiple grids of unit area;

[0178] According to the resistivity of multiple loss devices in the loss device node cluster area, the grid current intensity coefficient of each subdivided unit area grid under the total grid current intensity is determined;

[0179] According to each grid-connected current intensity coefficient, determine the grid-connected potential distribution in the loss equipment node cluster area;

[0180] Based on the grid potential distribution, the distribution network self-healing loss control device is used to regulate the power supply voltage provided by the distributed power supply in the loss equipment node cluster area to minimize the loss power in the loss equipment node cluster area.

[0181] The implementation principles and technical effects of each step implemented by the processor in the embodiment of the present application are similar to the principles of the loss control method in the above-mentioned distribution network self-healing, and will not be repeated here.

[0182] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0183] Gridding is performed on the loss equipment node cluster area in the power system to obtain multiple grids of unit area;

[0184] According to the resistivity of multiple loss devices in the loss device node cluster area, the grid current intensity coefficient of each subdivided unit area grid under the total grid current intensity is determined;

[0185] According to each grid-connected current intensity coefficient, determine the grid-connected potential distribution in the loss equipment node cluster area;

[0186] Based on the grid potential distribution, the distribution network self-healing loss control device is used to regulate the power supply voltage provided by the distributed power supply in the loss equipment node cluster area to minimize the loss power in the loss equipment node cluster area.

[0187] The implementation principles and technical effects of the steps implemented when the computer program in the embodiment of the present application is executed by the processor are similar to the principles of the loss control method in the above-mentioned distribution network self-healing, and will not be repeated here.

[0188] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0189] Gridding is performed on the loss equipment node cluster area in the power system to obtain multiple grids of unit area;

[0190] According to the resistivity of multiple loss devices in the loss device node cluster area, the grid current intensity coefficient of each subdivided unit area grid under the total grid current intensity is determined;

[0191] According to each grid-connected current intensity coefficient, determine the grid-connected potential distribution in the loss equipment node cluster area;

[0192] Based on the grid potential distribution, the distribution network self-healing loss control device is used to regulate the power supply voltage provided by the distributed power supply in the loss equipment node cluster area to minimize the loss power in the loss equipment node cluster area.

[0193] The implementation principles and technical effects of the steps implemented when the computer program in the embodiment of the present application is executed by the processor are similar to the principles of the loss control method in the above-mentioned distribution network self-healing, and will not be repeated here.

[0194] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0195] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0196] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0197] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A loss control method in distribution network self-healing, characterized in that: The method comprises: Gridding is performed on the loss equipment node cluster area in the power system to obtain multiple grids of unit area; Determining the grid-connected current intensity coefficient of each of the subdivided unit area grids under the total grid-connected current intensity according to the resistivity of a plurality of loss devices in the loss device node cluster area; Determining the grid-connected potential distribution of the loss device node cluster area according to each of the grid-connected current intensity coefficients; Based on the grid-connected potential distribution, a distribution network self-healing loss control device is used to control the power supply voltage provided by the distributed power source in the loss device node cluster area to minimize the loss power in the loss device node cluster area.

2. The method according to claim 1, characterized in that The grid division is performed on the loss equipment node cluster area in the power system to obtain a plurality of grids of divided unit area, including: Based on a Cartesian rectangular coordinate system, obtaining the three-axis lengths of the lossy device node cluster area; Based on the lengths in the three-axis directions, the lossy device node cluster area is gridded to obtain the multiple grids of unit area.

3. The method according to claim 2, characterized in that The grid division of the lossy equipment node cluster area based on the lengths of the three-axis directions to obtain the plurality of grids of divided unit area includes: Determine the spacing division length of the lossy device node cluster area in the three-axis direction according to the three-axis direction length; According to each of the spacing division lengths, the lossy device node cluster area is divided in the three-axis directions respectively to obtain the multiple divided unit area grids.

4. The method according to any one of claims 1 to 3, characterized in that: The step of determining the grid-connected current intensity coefficient of each of the subdivided unit area grids under the total grid-connected current intensity according to the resistivity of the plurality of loss devices in the loss device node cluster area comprises: Obtaining the power supply current intensity of the power supply point, the distance from the grid connection point to the center of each subdivided unit area grid, the subdivided resistivity of the lossy equipment node cluster area, and the maximum value of the distance from all grid connection points to the center of each subdivided unit area grid; The grid-connected current intensity coefficient of each of the subdivided unit area grids under the total grid-connected current intensity is determined according to each of the resistivities, the power supply current intensity, each of the distances, the subdivided resistivities and the maximum distance.

5. The method according to any one of claims 1 to 3, characterized in that: Determining the grid-connected potential distribution of the loss device node cluster area according to each of the grid-connected current intensity coefficients includes: Taking each subdivided unit area grid as a unit point source, and determining the potential and the potential derivative caused by each unit point source at a ground measuring point according to each grid-connected current intensity coefficient; Integrating and calculating the potentials and potential derivatives caused by all unit point sources at the ground measuring points to obtain the potentials and potential derivatives caused by each loss device at the ground measuring points; The grid-connected potential distribution of the loss equipment node cluster area is determined based on the potential and potential derivative caused by each loss equipment at the ground measurement point.

6. The method according to any one of claims 1 to 3, characterized in that: Based on the grid-connected potential distribution, a distribution network self-healing loss control device is used to control the power supply voltage provided by the distributed power supply in the loss device node cluster area, including: Determining the operating state of the distributed power source according to the grid-connected potential distribution; According to the operating state, the components in the distribution network self-healing loss control device are operated to achieve control of the power supply voltage.

7. The method according to claim 6, characterized in that The distribution network self-healing loss control device includes a first distributed power source drive integrated module, a second distributed power source drive integrated module, a first diode and a second diode; the operation of the components in the distribution network self-healing loss control device according to the operating state includes: If the operating state is the off steady state, the operating mode is at a low level, the first distributed power drive integrated module and the second distributed power drive integrated module are turned off, the first diode is disconnected, and the second diode is turned on; If the operating state is a transient state, the operating mode is switched from a low level to a high level, the first distributed power source drive integrated module and the second distributed power source drive integrated module are turned on, the first diode is turned on, and the second diode is turned off; If the operating state is an open steady state, the operating mode is at a high level, the first distributed power source drive integrated module and the second distributed power source drive integrated module are turned on, the first diode is turned on, and the second diode is turned off; If the operating state is a shutdown transient state, the operating mode is switched from a high level to a low level, the first distributed power source drive integrated module and the second distributed power source drive integrated module are shut down, the first diode is disconnected, and the second diode is turned on.

8. A loss control device in distribution network self-healing, characterized in that: The device comprises: A grid partitioning module is used to partition the loss equipment node cluster area in the power system to obtain multiple partitioned unit area grids; A current intensity coefficient determination module, used to determine the grid-connected current intensity coefficient of each of the subdivided unit area grids under the total grid-connected current intensity according to the resistivity of multiple loss devices in the loss device node cluster area; A potential distribution determination module, used to determine the grid-connected potential distribution of the loss device node cluster area according to each of the grid-connected current intensity coefficients; The loss control module is used to control the power supply voltage provided by the distributed power supply in the loss device node cluster area based on the grid-connected potential distribution and adopt the distribution network self-healing loss control device to minimize the loss power in the loss device node cluster area.

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

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

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