A method and device for regional dynamic partitioning of a power distribution network containing distributed power sources

Abstract

The application provides a kind of containing distributed power distribution network regional dynamic partition method and device, and the initial topological structure of distribution network is partitioned, and a plurality of initial sub-regions are obtained;Combining a plurality of adjacent initial sub-regions, a plurality of candidate sub-regions are obtained;A plurality of candidate sub-regions are partitioned and merged, and a plurality of optimal sub-regions are determined, which greatly improves the coordination control ability of distribution network to distributed power across region and the utilization rate of distributed power consumption;The technical scheme provided by the application dynamically and finely divides the topological structure of distribution network through sectionalizing switch and tie switch according to the change of distributed power and load, realizes the flexible and efficient combination and utilization of distributed power between sub-regions of distribution network, so that distribution network can respond to load and intermittent power fluctuation in short time scale, effectively promotes power balance, and reduces distribution network line loss.

Description

Technical Field

[0001] This invention relates to the field of power distribution network technology, and specifically to a method and apparatus for dynamically dividing a power distribution network area containing distributed power sources. Background Technology

[0002] The energy crisis and the escalating trend of global warming have led to the widespread promotion and utilization of distributed renewable energy. With the increasing sophistication of energy policies and electricity markets, the penetration rate of distributed power sources in the power grid is constantly rising. However, due to the susceptibility of distributed power generation to external environmental influences, its intermittent and uncertain output characteristics are becoming increasingly pronounced. Furthermore, the load on the distribution network changes continuously over time. This uncertainty on the "source-load" side makes the power system's operation more diversified, decentralized, and differentiated, posing significant challenges to the optimized operation of the distribution network. Future distribution networks must therefore meet the requirements for efficient utilization and high compatibility with distributed renewable energy generation, thereby improving power balance capabilities.

[0003] Microgrid control, as a novel energy network supply and management technology, integrates distributed power sources, loads, energy storage devices, and control devices from a systemic perspective, forming a single controllable unit that simultaneously provides electricity and heat to users. It is an effective way to solve the problem of centralized grid-connected power supply from distributed renewable energy sources, but it still has certain limitations. Energy storage devices in microgrids play a role in smoothing power fluctuations. Due to the high configuration cost of energy storage devices, the number installed in actual distribution networks is relatively small, further increasing the difficulty of coordinated optimization control of the distribution network. Currently, for distribution networks with distributed power sources but no energy storage devices, in order to improve the absorption and utilization rate of distributed power sources and ensure the power balance of the grid, network reconfiguration of the distribution network is generally achieved through intelligent algorithms. However, the accuracy of the solution results is greatly affected by the algorithm and the calculation is complex. Existing technologies only roughly divide the distribution network area containing distributed power sources based on tie switches or sectionalizing switches, without considering the complementary characteristics of distributed power sources between areas. This results in poor cross-regional coordinated control capability of the distribution network for distributed power sources and low absorption and utilization rate of distributed power sources. Summary of the Invention

[0004] To overcome the shortcomings of the existing technology, such as poor cross-regional coordination and control capability of distribution networks for distributed generation and low utilization rate of distributed generation, this invention provides a method and device for dynamic division of distribution network areas containing distributed generation, which greatly improves the cross-regional coordination and control capability of distribution networks for distributed generation and the utilization rate of distributed generation.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0006] On one hand, the present invention provides a method for dynamically dividing a distribution network area containing distributed power sources, comprising:

[0007] The initial topology of the power distribution network is divided into multiple initial sub-regions, and the comprehensive source-load balance and the sufficiency of all distributed power sources in each initial sub-region are calculated.

[0008] Based on the comprehensive source-load balance of each initial sub-region and the sufficiency of all distributed power sources, multiple adjacent initial sub-regions are combined to obtain multiple candidate sub-regions.

[0009] Multiple candidate sub-regions are partitioned and merged, and multiple optimal sub-regions are determined based on the distribution network line loss and distributed power generation absorption and utilization rate after the merger and the distribution network line loss and distributed power generation absorption and utilization rate before partitioning.

[0010] The partitioning of the initial topology of the distribution network includes:

[0011] Based on the initial topology of the distribution network, if there is a distributed power source between two sectionalizing switches / tie switches on the line, it is divided into an independent sub-region; if there is a distributed power source between the sectionalizing switch / tie switch and the end node of the line, it is divided into an independent sub-region.

[0012] The overall source-load balance of each initial sub-region is calculated using the following formula:

[0013]

[0014] In the formula, Let N be the overall source-load balance of the i-th initial sub-region. 1i Let be the total number of nodes in the i-th initial sub-region. This represents the initial total number of subregions. Let be the total number of distributed power sources in the i-th initial sub-region, m be the first node in the topology before partitioning, and n be all the last nodes in the topology before partitioning that are directly connected to the first node m. P represents the active power of the d-th distributed power source connected to the grid on line mn between the first node m and the last node n. m The active power injected into the first node m.

[0015] The sufficiency of all distributed power sources in each initial sub-region is calculated using the following formula:

[0016]

[0017] In the formula, Let represent the sufficiency of all distributed power sources in the i-th initial sub-region. This refers to all nodes between the distributed power supply access location and the end node n in the i-th initial sub-region.

[0018] The process involves partitioning and merging multiple candidate sub-regions, and determining multiple optimal sub-regions based on the combined distribution network line loss and distributed generation utilization rate compared to the unpartitioned distribution network line loss and distributed generation utilization rate, including:

[0019] S1. Based on the shortest path algorithm, select the sub-region to be optimized from multiple candidate sub-regions, and merge the sub-region to be optimized and the initial sub-region that has not been combined to generate the optimal sub-region.

[0020] S2, calculate the distribution network line loss and distributed power source absorption and utilization rate based on the optimal sub-region;

[0021] S3. Compare the line loss and distributed generation utilization rate of the merged distribution network with the line loss and distributed generation utilization rate of the distribution network before partitioning. If the line loss of the merged distribution network is reduced and the distributed generation utilization rate is increased, then dynamically partition the network according to the currently generated optimal sub-region and end the calculation; otherwise, recombine the adjacent initial sub-regions and execute step S1.

[0022] Based on the comprehensive source-load balance of each initial sub-region and the sufficiency of all distributed power sources, multiple adjacent initial sub-regions are combined to obtain multiple candidate sub-regions, including:

[0023] The source-load complementarity between adjacent initial sub-regions is determined based on the comprehensive source-load balance of each initial sub-region and the sufficiency of all distributed power sources in each initial sub-region.

[0024] Based on the source-load complementarity between adjacent initial sub-regions, multiple adjacent initial sub-regions are combined to obtain multiple candidate sub-regions.

[0025] The line loss of the distribution network without zoning is calculated using the following formula:

[0026]

[0027] In the formula, ΔP L The line loss of the distribution network when it is not zoned. This refers to the active power of all distributed power sources connected to the grid on line mn. Q represents the reactive power of all distributed power sources connected to the grid on line mn. m The reactive power injected into the first node m, R mn Let X be the unit resistance of line mn. mn Let mn be the unit reactance of the line, and j be the imaginary potential. This refers to the connection status of distributed power sources on line mn. A value of 0 indicates that no distributed power source is connected to line mn. Setting it to 1 indicates that a distributed power source is connected to line mn, U m L represents the voltage amplitude at the first node m. mn G is the length of line mn. mn Let m be the length of the line from the first node m on line mn to the location where the distributed power source is connected.

[0028] The average absorption and utilization rate of distributed generation in the distribution network without zoning is calculated using the following formula:

[0029]

[0030] In the formula, N represents the average absorption and utilization rate of distributed generation in the distribution network without zoning. DG K represents the total number of distributed generation sources in the distribution network without zoning. DG This represents the absorption and utilization rate of all distributed generation sources in the distribution network without zoning, and This represents the on-grid active power of the k-th distributed generation in the distribution network when no zoning is performed. This represents the maximum active power of the k-th distributed power source in the distribution network.

[0031] The line loss of the merged distribution network is calculated using the following formula:

[0032]

[0033] In the formula, ΔP L P' represents the line loss of the merged distribution network, m' represents the first node in the merged topology, n' represents all the last nodes in the merged topology that are directly connected to the first node m', and P' represents the line loss of the merged distribution network. m′ The active power Q injected into the first node m′ m′ The reactive power injected into the first node m′ This represents the active power of all distributed power sources connected to the grid on line m′n′. R represents the reactive power of all distributed power sources connected to the grid on line m′n′. m′n′ Let X be the unit resistance of line m′n′. m′n′ Let m′n′ be the unit reactance of line m′n′, and j be the imaginary potential. This represents the connection status of distributed power sources on line m′n′. Setting it to 0 indicates that no distributed power source is connected to line m′n′. Setting it to 1 indicates that a distributed power source is connected to line m′n′, U m′ Let L be the voltage magnitude at the first node m′. m′n′ Let G be the length of line m′n′. m′n′ Let m be the length of the line from the first node m′ on line m′n′ to the location where the distributed power source is connected.

[0034] The average absorption and utilization rate of distributed generation in the merged distribution network is calculated using the following formula:

[0035]

[0036] In the formula, N′ represents the average absorption and utilization rate of distributed generation in the merged distribution network. DG K′ represents the total number of distributed generation sources in the merged distribution network. DG This refers to the absorption and utilization rate of all distributed generation sources in the merged distribution network, and This represents the active power of the k-th distributed generation source connected to the grid in the merged distribution network. This represents the maximum active power of the k-th distributed power source in the distribution network.

[0037] On the other hand, the present invention also provides a device for dynamically dividing a distribution network area containing distributed power sources, comprising:

[0038] The partitioning module is used to partition the initial topology of the distribution network into multiple initial sub-regions, and calculate the comprehensive source-load balance and the sufficiency of all distributed power sources in each initial sub-region.

[0039] The combination module is used to combine multiple adjacent initial sub-regions based on the comprehensive source-load balance of each initial sub-region and the sufficiency of all distributed power sources to obtain multiple candidate sub-regions.

[0040] The determination module is used to partition and merge multiple candidate sub-regions, and determine multiple optimal sub-regions based on the distribution network line loss and distributed power generation utilization rate after the partitioning and the distribution network line loss and distributed power generation utilization rate before partitioning.

[0041] The partitioning module is specifically used for:

[0042] Based on the initial topology of the distribution network, if there is a distributed power source between two sectionalizing switches / tie switches on the line, it is divided into an independent sub-region; if there is a distributed power source between the sectionalizing switch / tie switch and the end node of the line, it is divided into an independent sub-region.

[0043] Compared with the closest existing technology, the technical solution provided by the present invention has the following beneficial effects:

[0044] The present invention provides a method for dynamically dividing a distribution network area containing distributed power sources. The initial topology of the distribution network is divided into multiple initial sub-regions, and the comprehensive source-load balance and the adequacy of all distributed power sources in each initial sub-region are calculated. Based on the comprehensive source-load balance and the adequacy of all distributed power sources in each initial sub-region, multiple adjacent initial sub-regions are combined to obtain multiple candidate sub-regions. These candidate sub-regions are then merged, and multiple optimal sub-regions are determined based on the combined distribution network line loss and distributed power source absorption and utilization rate compared to the distribution network line loss and distributed power source absorption and utilization rate before merging. This significantly improves the distribution network's ability to coordinate and control distributed power sources across regions and enhances the distributed power source absorption and utilization rate.

[0045] The technical solution provided by this invention dynamically and finely divides the topology of the distribution network based on changes in distributed power sources and loads through sectionalizing switches and tie switches. This enables flexible and efficient combination and utilization of distributed power sources between sub-regions of the distribution network, allowing the distribution network to respond in real time to load and intermittent power fluctuations within a short time scale. This effectively promotes power balance and reduces distribution network line losses. Attached Figure Description

[0046] Figure 1 This is a flowchart of the dynamic division method for distribution network areas containing distributed power sources in an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of a dynamic division device for a distribution network area containing distributed power sources in an embodiment of the present invention. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings.

[0049] Example 1

[0050] Embodiment 1 of the present invention provides a method for dynamically dividing a distribution network area containing distributed power sources, the specific flowchart of which is shown below. Figure 1 As shown, the specific process is as follows:

[0051] S101: Divide the initial topology of the distribution network into multiple initial sub-regions, and calculate the comprehensive source-load balance and the sufficiency of all distributed power sources in each initial sub-region.

[0052] S102: Based on the comprehensive source-load balance of each initial sub-region and the sufficiency of all distributed power sources, multiple adjacent initial sub-regions are combined to obtain multiple candidate sub-regions;

[0053] S103: Divide and merge multiple candidate sub-regions, and determine multiple optimal sub-regions based on the distribution network line loss and distributed power generation absorption and utilization rate after merging and the distribution network line loss and distributed power generation absorption and utilization rate before partitioning.

[0054] The initial topology of the distribution network is partitioned, including:

[0055] Based on the initial topology of the distribution network, if there is a distributed power source between two sectionalizing switches / tie switches on the line, it is divided into an independent sub-region; if there is a distributed power source between the sectionalizing switch / tie switch and the end node of the line, it is divided into an independent sub-region.

[0056] The overall source-load balance of each initial sub-region is calculated using the following formula:

[0057]

[0058] In the formula, Let N be the overall source-load balance of the i-th initial sub-region. 1i Let be the total number of nodes in the i-th initial sub-region. This represents the initial total number of subregions. Let be the total number of distributed power sources in the i-th initial sub-region, m be the first node in the topology before partitioning, and n be all the last nodes in the topology before partitioning that are directly connected to the first node m. P represents the active power of the d-th distributed power source connected to the grid on line mn between the first node m and the last node n. m The active power injected into the first node m.

[0059] The sufficiency of all distributed power sources in each initial sub-region is calculated using the following formula:

[0060]

[0061] In the formula, Let represent the sufficiency of all distributed power sources in the i-th initial sub-region. This refers to all nodes between the distributed power supply access location and the end node n in the i-th initial sub-region.

[0062] Multiple candidate sub-regions are partitioned and merged. Based on the combined distribution network line loss and distributed generation utilization rate compared to the unpartitioned distribution network line loss and distributed generation utilization rate, several optimal sub-regions are determined, including:

[0063] S1. Based on the shortest path algorithm, select the sub-region to be optimized from multiple candidate sub-regions, and merge the sub-region to be optimized and the initial sub-region that has not been combined to generate the optimal sub-region.

[0064] S2, calculate the distribution network line loss and distributed power source absorption and utilization rate based on the optimal sub-region;

[0065] S3. Compare the line loss and distributed generation utilization rate of the merged distribution network with the line loss and distributed generation utilization rate of the distribution network before partitioning. If the line loss of the merged distribution network is reduced and the distributed generation utilization rate is increased, then dynamically partition the network according to the currently generated optimal sub-region and end the calculation; otherwise, recombine the adjacent initial sub-regions and execute step S1.

[0066] Based on the comprehensive source-load balance of each initial sub-region and the sufficiency of all distributed power sources, multiple adjacent initial sub-regions are combined to obtain multiple candidate sub-regions, including:

[0067] The source-load complementarity between adjacent initial sub-regions is determined based on the comprehensive source-load balance of each initial sub-region and the sufficiency of all distributed power sources in each initial sub-region.

[0068] Based on the source-load complementarity between adjacent initial sub-regions, multiple adjacent initial sub-regions are combined to obtain multiple candidate sub-regions.

[0069] When the distribution network is not zoned, the line loss is calculated using the following formula:

[0070]

[0071] In the formula, ΔP L The line loss of the distribution network when it is not zoned. This refers to the active power of all distributed power sources connected to the grid on line mn. Q represents the reactive power of all distributed power sources connected to the grid on line mn. m The reactive power injected into the first node m, R mn Let X be the unit resistance of line mn. mn Let mn be the unit reactance of the line, and j be the imaginary potential. This refers to the connection status of distributed power sources on line mn. A value of 0 indicates that no distributed power source is connected to line mn. Setting it to 1 indicates that a distributed power source is connected to line mn, U m L represents the voltage amplitude at the first node m. mn G is the length of line mn. mn Let m be the length of the line from the first node m on line mn to the location where the distributed power source is connected.

[0072] When no zoning is performed, the average absorption and utilization rate of distributed generation in the distribution network is calculated using the following formula:

[0073]

[0074] In the formula, N represents the average absorption and utilization rate of distributed generation in the distribution network without zoning. DG K represents the total number of distributed generation sources in the distribution network without zoning. DG This represents the absorption and utilization rate of all distributed generation sources in the distribution network without zoning, and This represents the on-grid active power of the k-th distributed generation in the distribution network when no zoning is performed. This represents the maximum active power of the k-th distributed power source in the distribution network.

[0075] The line loss of the merged distribution network is calculated using the following formula:

[0076]

[0077] In the formula, ΔP L P' represents the line loss of the merged distribution network, m' represents the first node in the merged topology, n' represents all the last nodes in the merged topology that are directly connected to the first node m', and P' represents the line loss of the merged distribution network. m′ The active power Q injected into the first node m′ m′ The reactive power injected into the first node m′ This represents the active power of all distributed power sources connected to the grid on line m′n′. R represents the reactive power of all distributed power sources connected to the grid on line m′n′. m′n′ Let X be the unit resistance of line m′n′. m′n′ Let m′n′ be the unit reactance of line m′n′, and j be the imaginary potential. This represents the connection status of distributed power sources on line m′n′. Setting it to 0 indicates that no distributed power source is connected to line m′n′. Setting it to 1 indicates that a distributed power source is connected to line m′n′, U m′ Let L be the voltage magnitude at the first node m′. m′n′ Let G be the length of line m′n′. m′n′ Let m be the length of the line from the first node m′ on line m′n′ to the location where the distributed power source is connected.

[0078] The average absorption and utilization rate of distributed generation in the merged distribution network is calculated using the following formula:

[0079]

[0080] In the formula, N′ represents the average absorption and utilization rate of distributed generation in the merged distribution network. DG K′ represents the total number of distributed generation sources in the merged distribution network.DG This refers to the absorption and utilization rate of all distributed generation sources in the merged distribution network, and This represents the active power of the k-th distributed generation source connected to the grid in the merged distribution network. This represents the maximum active power of the k-th distributed power source in the distribution network.

[0081] Example 2

[0082] Based on the same inventive concept, Embodiment 2 of the present invention also provides a device for dynamically dividing a distribution network area containing distributed power sources, such as... Figure 2 As shown below, the functions of each component are explained in detail:

[0083] The partitioning module is used to partition the initial topology of the distribution network into multiple initial sub-regions, and calculate the comprehensive source-load balance and the sufficiency of all distributed power sources in each initial sub-region.

[0084] The combination module is used to combine multiple adjacent initial sub-regions based on the comprehensive source-load balance of each initial sub-region and the sufficiency of all distributed power sources to obtain multiple candidate sub-regions.

[0085] The determination module is used to partition and merge multiple candidate sub-regions, and determine multiple optimal sub-regions based on the distribution network line loss and distributed power generation utilization rate after the partitioning and the distribution network line loss and distributed power generation utilization rate before partitioning.

[0086] The module division is specifically used for:

[0087] Based on the initial topology of the distribution network, if there is a distributed generation between two sectionalizing switches / tie switches on the line, it is divided into an independent sub-region; if there is a distributed generation between the sectionalizing switch / tie switch and the end node of the line, it is divided into an independent sub-region. In other words, the partitioning module performs initial partitioning of the distribution network's initial topology according to the following principles: if there is a distributed generation between two sectionalizing switches / tie switches on the line, it is divided into an independent sub-region; if there is a distributed generation between the sectionalizing switch / tie switch and the end node of the line, it is divided into an independent sub-region.

[0088] The combined module calculates the integrated source-load balance of each initial sub-region using the following formula:

[0089]

[0090] In the formula, Let N be the overall source-load balance of the i-th initial sub-region. 1i Let be the total number of nodes in the i-th initial sub-region. This represents the initial total number of subregions. Let m be the total number of distributed power sources in the i-th initial sub-region, m be the first node in the topology before partitioning (i.e., the initial topology), and n be all the last nodes in the topology before partitioning (i.e., the initial topology) that are directly connected to the first node m. P represents the active power of the d-th distributed power source connected to the grid on line mn between the first node m and the last node n. m The active power injected into the first node m.

[0091] The combined module calculates the adequacy of all distributed power sources in each initial sub-region using the following formula:

[0092]

[0093] In the formula, Let represent the sufficiency of all distributed power sources in the i-th initial sub-region. This refers to all nodes between the distributed power supply access location and the end node n in the i-th initial sub-region.

[0094] The module is specifically used for:

[0095] S1. Based on the shortest path algorithm, select the sub-region to be optimized from multiple candidate sub-regions, and merge the sub-region to be optimized and the initial sub-region that has not been combined to generate the optimal sub-region.

[0096] S2, calculate the distribution network line loss and distributed power source absorption and utilization rate based on the optimal sub-region;

[0097] S3. Compare the line loss and distributed generation utilization rate of the merged distribution network with the line loss and distributed generation utilization rate of the distribution network before partitioning. If the line loss of the merged distribution network is reduced and the distributed generation utilization rate is increased, then dynamically partition the network according to the currently generated optimal sub-region and end the calculation; otherwise, recombine the adjacent initial sub-regions and execute step S1.

[0098] The composite module is specifically used for:

[0099] The source-load complementarity between adjacent initial sub-regions is determined based on the comprehensive source-load balance of each initial sub-region and the sufficiency of all distributed power sources in each initial sub-region.

[0100] Based on the source-load complementarity between adjacent initial sub-regions, multiple adjacent initial sub-regions are combined to obtain multiple candidate sub-regions.

[0101] The module is determined to calculate the line loss of the distribution network without zoning using the following formula:

[0102]

[0103] In the formula, ΔP L The line loss of the distribution network when it is not zoned. This refers to the active power of all distributed power sources connected to the grid on line mn. Q represents the reactive power of all distributed power sources connected to the grid on line mn. m The reactive power injected into the first node m, R mn Let X be the unit resistance of line mn. mn Let mn be the unit reactance of the line, and j be the imaginary potential. This refers to the connection status of distributed power sources on line mn. A value of 0 indicates that no distributed power source is connected to line mn. Setting it to 1 indicates that a distributed power source is connected to line mn, U m L represents the voltage amplitude at the first node m. mn G is the length of line mn. mn The length of the line from the first node m on line mn to the location where the distributed power source is connected;

[0104] The module is determined by calculating the average absorption and utilization rate of distributed generation in the distribution network without zoning using the following formula:

[0105]

[0106] In the formula, N represents the average absorption and utilization rate of distributed generation in the distribution network without zoning. DG K represents the total number of distributed generation sources in the distribution network without zoning. DG This represents the absorption and utilization rate of all distributed generation sources in the distribution network without zoning, and This represents the on-grid active power of the k-th distributed generation in the distribution network when no zoning is performed. This represents the maximum active power of the k-th distributed power source in the distribution network.

[0107] The module is determined to calculate the line loss of the distribution network under the merged topology using the following formula:

[0108]

[0109] In the formula, ΔP L P' represents the line loss of the merged distribution network, m' represents the first node in the merged topology, n' represents all the last nodes in the merged topology that are directly connected to the first node m', and P' represents the line loss of the merged distribution network. m′ The active power Q injected into the first node m′ m′ The reactive power injected into the first node m′ This represents the active power of all distributed power sources connected to the grid on line m′n′. R represents the reactive power of all distributed power sources connected to the grid on line m′n′. m′n′ Let X be the unit resistance of line m′n′. m′n′ Let m′n′ be the unit reactance of line m′n′, and j be the imaginary potential. This represents the connection status of distributed power sources on line m′n′. Setting it to 0 indicates that no distributed power source is connected to line m′n′. Setting it to 1 indicates that a distributed power source is connected to line m′n′, U m′ Let L be the voltage magnitude at the first node m′. m′n′ Let G be the length of line m′n′. m′n′ The length of the line from the first node m′ on line m′n′ to the location where the distributed power source is connected;

[0110] The module is determined by calculating the average absorption and utilization rate of distributed generation in the merged distribution network using the following formula:

[0111]

[0112] In the formula, N′ represents the average absorption and utilization rate of distributed generation in the distribution network after the merger (i.e., under the optimized topology). DG K′ represents the total number of distributed generation sources in the merged distribution network. DG This refers to the absorption and utilization rate of all distributed generation sources in the merged distribution network, and This represents the active power of the k-th distributed generation source connected to the grid in the merged distribution network. This represents the maximum active power of the k-th distributed power source in the distribution network.

[0113] For ease of description, the various parts of the above device are described separately as modules or units based on their functions. Of course, in implementing this application, the functions of each module or unit can be implemented in one or more software or hardware components.

[0114] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0115] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0116] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0117] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Those skilled in the art can still make modifications or equivalent substitutions to the specific implementation of the present invention by referring to the above embodiments. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are within the protection scope of the present invention pending approval.

Claims

1. A method for dynamically dividing a distribution network area containing distributed generation sources, characterized in that, include: The initial topology of the power distribution network is divided into multiple initial sub-regions, and the comprehensive source-load balance and the sufficiency of all distributed power sources in each initial sub-region are calculated. Based on the comprehensive source-load balance of each initial sub-region and the sufficiency of all distributed power sources, multiple adjacent initial sub-regions are combined to obtain multiple candidate sub-regions. Multiple candidate sub-regions are partitioned and merged, and multiple optimal sub-regions are determined based on the distribution network line loss and distributed power generation absorption and utilization rate after the merger and the distribution network line loss and distributed power generation absorption and utilization rate before partitioning. The overall source-load balance of each initial sub-region is calculated using the following formula: In the formula, Let N be the overall source-load balance of the i-th initial sub-region. 1i Let A be the total number of nodes in the i-th initial sub-region. 1I This represents the initial total number of subregions. Let m be the total number of distributed power sources in the i-th initial sub-region, m be the first node in the initial topology, and n be all the last nodes in the initial topology that are directly connected to the first node m. P represents the active power of the d-th distributed power source connected to the grid on line mn between the first node m and the last node n. m Active power injected into the first node m; The sufficiency of all distributed power sources in each initial sub-region is calculated using the following formula: In the formula, Let represent the sufficiency of all distributed power sources in the i-th initial sub-region. For all nodes between the distributed power supply access location and the end node n in the i-th initial sub-region; Based on the comprehensive source-load balance of each initial sub-region and the sufficiency of all distributed power sources, multiple adjacent initial sub-regions are combined to obtain multiple candidate sub-regions, including: The source-load complementarity between adjacent initial sub-regions is determined based on the comprehensive source-load balance of each initial sub-region and the sufficiency of all distributed power sources in each initial sub-region. Based on the source-load complementarity between adjacent initial sub-regions, multiple adjacent initial sub-regions are combined to obtain multiple candidate sub-regions.

2. The method for dynamically dividing a distribution network area containing distributed power sources according to claim 1, characterized in that, The partitioning of the initial topology of the distribution network includes: Based on the initial topology of the distribution network, if there is a distributed power source between two sectionalizing switches / tie switches on the line, it is divided into an independent sub-region; if there is a distributed power source between the sectionalizing switch / tie switch and the end node of the line, it is divided into an independent sub-region.

3. The method for dynamically dividing a distribution network area containing distributed power sources according to claim 1, characterized in that, The process involves partitioning and merging multiple candidate sub-regions, and determining multiple optimal sub-regions based on the combined distribution network line loss and distributed generation utilization rate compared to the unpartitioned distribution network line loss and distributed generation utilization rate, including: S1. Based on the shortest path algorithm, select the sub-region to be optimized from multiple candidate sub-regions, and merge the sub-region to be optimized and the initial sub-region that has not been combined to generate the optimal sub-region. S2, calculate the distribution network line loss and distributed power source absorption and utilization rate based on the optimal sub-region; S3. Compare the line loss and distributed generation utilization rate of the merged distribution network with the line loss and distributed generation utilization rate of the distribution network before partitioning. If the line loss of the merged distribution network is reduced and the distributed generation utilization rate is increased, then dynamically partition the network according to the currently generated optimal sub-region and end the calculation; otherwise, recombine the adjacent initial sub-regions and execute step S1.

4. The method for dynamically dividing a distribution network area containing distributed power sources according to claim 3, characterized in that, The line loss of the distribution network without zoning is calculated using the following formula: In the formula, ΔP L The line loss of the distribution network when it is not zoned. This refers to the active power of all distributed power sources connected to the grid on line mn. Q represents the reactive power of all distributed power sources connected to the grid on line mn. m The reactive power injected into the first node m, R mn Let X be the unit resistance of line mn. mn Let mn be the unit reactance of the line, and j be the imaginary potential. This refers to the connection status of distributed power sources on line mn. A value of 0 indicates that no distributed power source is connected to line mn. Setting it to 1 indicates that a distributed power source is connected to line mn, U m L represents the voltage amplitude at the first node m. mn G is the length of line mn. mn Let m be the length of the line from the first node m on line mn to the location where the distributed power source is connected.

5. The method for dynamically dividing a distribution network area containing distributed power sources according to claim 4, characterized in that, The average absorption and utilization rate of distributed generation in the distribution network without zoning is calculated using the following formula: In the formula, N represents the average absorption and utilization rate of distributed generation in the distribution network without zoning. DG K represents the total number of distributed generation sources in the distribution network without zoning. DG This represents the absorption and utilization rate of all distributed generation sources in the distribution network without zoning, and This represents the on-grid active power of the k-th distributed generation in the distribution network when no zoning is performed. This represents the maximum active power of the k-th distributed power source in the distribution network.

6. The method for dynamically dividing a distribution network area containing distributed power sources according to claim 1, characterized in that, The line loss of the merged distribution network is calculated using the following formula: In the formula, ΔP L P' represents the line loss of the merged distribution network, m' represents the first node in the merged topology, n' represents all the last nodes in the merged topology that are directly connected to the first node m', and P' represents the line loss of the merged distribution network. m′ The active power Q injected into the first node m′ m′ The reactive power injected into the first node m′ This represents the active power of all distributed power sources connected to the grid on line m′n′. R represents the reactive power of all distributed power sources connected to the grid on line m′n′. m′n′ Let X be the unit resistance of line m′n′. m′n′ Let m′n′ be the unit reactance of line m′n′, and j be the imaginary potential. This represents the connection status of distributed power sources on line m′n′. Setting it to 0 indicates that no distributed power source is connected to line m′n′. Setting it to 1 indicates that a distributed power source is connected to line m′n′, U m′ Let L be the voltage magnitude at the first node m′. m′n′ Let G be the length of line m′n′. m′n′ Let m be the length of the line from the first node m′ on line m′n′ to the location where the distributed power source is connected.

7. The method for dynamically dividing a distribution network area containing distributed power sources according to claim 1, characterized in that, The average absorption and utilization rate of distributed generation in the merged distribution network is calculated using the following formula: In the formula, N′ represents the average absorption and utilization rate of distributed generation in the merged distribution network. DG K′ represents the total number of distributed generation sources in the merged distribution network. DG This refers to the absorption and utilization rate of all distributed generation sources in the merged distribution network, and This represents the active power of the k-th distributed generation source connected to the grid in the merged distribution network. This represents the maximum active power of the k-th distributed power source in the distribution network.

8. An apparatus for using the dynamic division method for distribution network areas containing distributed power sources as described in claim 1, characterized in that, include: The partitioning module is used to partition the initial topology of the distribution network into multiple initial sub-regions, and calculate the comprehensive source-load balance and the sufficiency of all distributed power sources in each initial sub-region. The combination module is used to combine multiple adjacent initial sub-regions based on the comprehensive source-load balance of each initial sub-region and the sufficiency of all distributed power sources to obtain multiple candidate sub-regions. The determination module is used to partition and merge multiple candidate sub-regions, and determine multiple optimal sub-regions based on the distribution network line loss and distributed power generation utilization rate after the partitioning and the distribution network line loss and distributed power generation utilization rate before partitioning.

9. The apparatus for dynamically dividing a distribution network area containing distributed power sources according to claim 8, characterized in that, The partitioning module is specifically used for: Based on the initial topology of the distribution network, if there is a distributed power source between two sectionalizing switches / tie switches on the line, it is divided into an independent sub-region; if there is a distributed power source between the sectionalizing switch / tie switch and the end node of the line, it is divided into an independent sub-region.

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