Harmonic capacity distribution method, system and device considering inverter residual capacity and distance factor influence and storage medium
By constructing the Norton equivalent model and capacity allocation matrix, and based on the remaining capacity of the inverter and the electrical distance, the accurate allocation of harmonic mitigation capacity was achieved, solving the problem of uneven harmonic mitigation resources and improving the efficiency of transformer area mitigation and system stability.
Patent Information
- Application Number
- CN202511793911.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-02
- Publication Date
- 2026-03-06
AI Technical Summary
Existing harmonic mitigation capacity allocation methods do not fully consider the differences in remaining inverter capacity and electrical distance between nodes, resulting in uneven allocation of harmonic mitigation resources, low efficiency of transformer area mitigation, and local inverter load mismatch.
A Norton equivalent model is constructed to determine the priority of harmonic mitigation based on line impedance and electrical distance. The harmonic capacity between inverters is accurately allocated through a capacity allocation matrix, and dynamic adjustments are made in combination with remaining capacity and distance factors.
It improves the accuracy of harmonic analysis in the transformer substation, realizes balanced sharing of harmonic mitigation among multiple inverters and closed-loop capacity regulation, and enhances the stability and mitigation efficiency of system operation.
Smart Images
Figure CN121618474A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of power system technology, specifically to a method, system, device, and storage medium for harmonic capacity allocation that takes into account the influence of inverter remaining capacity and distance factors. Background Technology
[0002] With the increasing proportion of new power electronic devices and nonlinear loads such as electric vehicles, precision machining, and modern household appliances, the problem of harmonic pollution in power distribution networks is becoming increasingly serious.
[0003] Meanwhile, various renewable energy sources, such as solar and wind power, are booming, and a large number of grid-connected inverters are connected to the distribution network. However, their comprehensive utilization rate is less than 20%. In order to improve the utilization rate of various inverters and improve the power management of the distribution network, the control system structure of the grid-connected inverter can be changed to integrate harmonic mitigation function on the basis of the original inverter grid-connection function, that is, a multi-functional inverter. However, after the multi-functional inverter integrates harmonic mitigation function, its output apparent power will increase, which may lead to inverter overload operation, resulting in serious equipment overheating or even burnout, threatening the safe and stable operation of the system.
[0004] Currently, research on the active power grid-connected capacity and harmonic mitigation capacity allocation strategies for multiple multi-functional inverters mainly focuses on several aspects, such as harmonic capacity equal distribution and distribution based on the remaining capacity of the inverters. The implementation methods are mainly based on virtual impedance control and command circuit synthesis. In terms of accurate harmonic power equal distribution, adding a large fixed virtual harmonic impedance can reduce the difference in the connection impedance of each inverter and achieve harmonic current equal distribution through line impedance matching. However, this may also cause serious distortion of the bus voltage. Summary of the Invention
[0005] In view of the above-mentioned problems, the present invention is proposed.
[0006] Therefore, the technical problem solved by this invention is that existing harmonic mitigation capacity allocation methods do not fully consider the differences in remaining inverter capacity and electrical distance between nodes, resulting in uneven allocation of harmonic mitigation resources, low efficiency of distribution area mitigation, and local inverter load mismatch. The problem is how to achieve accurate allocation of harmonic mitigation capacity based on capacity and distance constraints in distribution areas with multiple inverters.
[0007] To address the aforementioned technical problems, this invention provides the following technical solution: a harmonic capacity allocation method considering the influence of inverter remaining capacity and distance factors, comprising: determining the load nodes, harmonic orders, and capacities to be harmonic-controlled; obtaining the remaining capacity information of each inverter under the distribution area; constructing a Norton equivalent model of the distribution area; determining the harmonic control priority of each inverter based on line impedance; constructing a harmonic capacity allocation scheme for the distribution area based on the remaining capacity information and harmonic control priority; obtaining the harmonic control capacity of the distribution area and the available control resource capacity of each inverter based on the harmonic capacity allocation scheme; determining the relationship between the harmonic distortion capacity and control resources of the distribution area through the Norton equivalent model; and determining the harmonic control capacity that each inverter in the distribution area needs to bear.
[0008] As a preferred embodiment of the harmonic capacity allocation method considering the influence of inverter remaining capacity and distance factors described in this invention, the Norton equivalent model includes equivalent modeling of the line impedance, node admittance and grid parameters in the distribution substation area to form an equivalent circuit characterizing the relationship between node voltage and harmonic current.
[0009] As a preferred embodiment of the harmonic capacity allocation method considering the influence of inverter remaining capacity and distance factors described in this invention, the harmonic mitigation priority includes: obtaining a comprehensive index of the inverter's mitigation priority for each node based on the electrical distance between each harmonic source and the inverter within the distribution substation area and the remaining capacity for harmonic capacity redistribution; ranking the comprehensive index of mitigation priority; inverters with smaller line impedance, closer distance, and larger comprehensive index of mitigation priority have higher harmonic mitigation priority; the comprehensive index of mitigation priority includes a comprehensive calculated value of line impedance and remaining capacity available for harmonic capacity redistribution, expressed as: , in, Indicates inverter Harmonic mitigation nodes Comprehensive indicators of governance priorities This represents the electrical distance weighting coefficient, which adjusts the degree of influence of electrical distance on the overall index. When the value is large, the electrical distance has a higher weight in the priority judgment. This represents the remaining capacity weighting coefficient, which adjusts the proportion of the inverter's remaining capacity in the comprehensive index calculation. When the value is large, the remaining capacity has a higher weight in priority judgment. This represents the baseline value of the line impedance, with the electrical distance term normalized. Indicates inverter Harmonic mitigation nodes The equivalent impedance of the lines between them Indicates inverter The remaining capacity during the redistribution phase, Indicates harmonic mitigation node The required capacity for harmonic mitigation.
[0010] As a preferred embodiment of the harmonic capacity allocation method considering the influence of inverter remaining capacity and distance factors described in this invention, the electrical distance includes the line equivalent impedance parameter and line equivalent admittance parameter of the inverter distance to the node to be harmonic mitigation; the line equivalent impedance parameter includes the equivalent line impedance between the inverter and the harmonic mitigation node in the distribution substation area; the line equivalent admittance parameter includes the equivalent line admittance between the inverter and the harmonic mitigation node in the distribution substation area.
[0011] As a preferred embodiment of the harmonic capacity allocation method considering the influence of inverter remaining capacity and distance factors described in this invention, the harmonic capacity allocation scheme includes: establishing a capacity allocation matrix under the constraints of inverter remaining capacity and harmonic governance priority; prioritizing allocation to the inverter at this node; and recursively allocating the remaining unallocated capacity to adjacent nodes according to the harmonic governance priority and electrical distance ratio.
[0012] As a preferred embodiment of the harmonic capacity allocation method considering the influence of inverter remaining capacity and distance factors described in this invention, the harmonic mitigation capacity of the distribution area includes the sum of the harmonic mitigation capacities of all inverters in the current distribution area; the harmonic mitigation capacity includes voltage distortion power, current distortion power, and apparent harmonic power; the harmonic mitigation capacity is expressed as: , in, This indicates the available harmonic mitigation capacity of the inverter; it represents the allocatable capacity of the inverter within its rated capacity range, after deducting the current grid-connected output, that can be used for harmonic mitigation. This indicates the rated capacity of the inverter, which is the maximum harmonic apparent power that the inverter can handle under operating conditions. This represents the grid-connected active power of the inverter, specifically the portion of the photovoltaic power currently output by the inverter to the grid. This indicates the maximum available harmonic control resources in the distribution area. This represents the total number of inverters in the current distribution area. This indicates the index of the number of inverters in the current transformer area.
[0013] As a preferred embodiment of the harmonic capacity allocation method considering the influence of inverter remaining capacity and distance factors described in this invention, the determination of the harmonic mitigation capacity to be borne by each inverter in the distribution area includes: when the remaining capacity of the inverters in the local node is sufficient, the inverters shall take priority in borne the harmonic capacity of the local node, and the inverters shall then bear the harmonic capacity of the remaining nodes according to the mitigation priority of the remaining nodes and the remaining capacity limit; when the remaining capacity of the inverters in the local node is insufficient, the harmonic capacity of the remaining nodes shall be allocated sequentially according to the mitigation priority of each inverter and the remaining capacity level by level.
[0014] Another objective of this invention is to provide a harmonic capacity allocation system that considers the influence of inverter remaining capacity and distance factors. This system can achieve coordinated quantification and allocation control of inverter remaining capacity and electrical distance through priority calculation and dynamic capacity allocation scheme. This solves the problems of capacity allocation relying on fixed parameters, lack of dynamic coordination mechanism, and uneven participation of inverters at different nodes in the current process of harmonic control in distribution substations.
[0015] As a preferred embodiment of the harmonic capacity allocation system considering the influence of inverter remaining capacity and distance factors described in this invention, the system includes: a priority calculation module, a capacity allocation module, and a dynamic allocation module. The priority calculation module is used to construct a Norton equivalent model based on the line impedance, node admittance, and grid parameters of the distribution substation, obtain the electrical distance between the inverter and each load node, and generate a comprehensive governance priority index by combining the remaining capacity from harmonic capacity redistribution. The capacity allocation module is used to establish a capacity allocation matrix under capacity constraints based on the inverter remaining capacity information and governance priority results, prioritizing allocation to the inverter at the current node, and recursively extending to adjacent nodes according to the electrical distance ratio to form a harmonic capacity allocation scheme. The dynamic allocation module is used to calculate the harmonic governance capacity of the distribution substation and the available governance resource capacity of the inverter based on the harmonic capacity allocation scheme, determine the relationship between harmonic distortion capacity and governance resources through the Norton equivalent model, and determine the harmonic governance capacity of each inverter by allocating it level by level according to the governance priority.
[0016] Another object of the present invention is to provide a harmonic capacity allocation device that takes into account the influence of inverter remaining capacity and distance factors, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of a harmonic capacity allocation method that takes into account the influence of inverter remaining capacity and distance factors.
[0017] Another object of the present invention is to provide a harmonic capacity allocation storage medium that takes into account the influence of inverter remaining capacity and distance factors, wherein a computer program is stored thereon, and when the computer program is executed by a processor, the steps of the harmonic capacity allocation method that takes into account the influence of inverter remaining capacity and distance factors are implemented.
[0018] The beneficial effects of this invention are as follows: The harmonic capacity allocation method considering the influence of inverter remaining capacity and distance factors provided by this invention achieves unified modeling of node harmonic characteristics by constructing a Norton equivalent model, thereby improving the accuracy of transformer area harmonic analysis; by introducing electrical distance and remaining capacity weights to calculate a comprehensive index of governance priority, adaptive determination of governance order among multiple inverters is realized; by establishing a capacity allocation matrix and performing dynamic recursive allocation, balanced sharing of harmonic governance tasks and closed-loop capacity adjustment are achieved; this invention achieves better results in terms of harmonic governance accuracy, resource allocation coordination, and system operation stability. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a flowchart of the harmonic capacity allocation strategy of the harmonic capacity allocation method considering the influence of inverter remaining capacity and distance factors provided in Embodiment 1 of the present invention.
[0021] Figure 2 The Norton equivalent circuit diagram of multiple photovoltaic parallel circuits in the distribution area is provided for the harmonic capacity allocation method considering the influence of inverter remaining capacity and distance factors in Embodiment 1 of the present invention.
[0022] Figure 3 This is a schematic diagram of a multi-photovoltaic parallel topology in a distribution station area, which is a method for allocating harmonic capacity considering the remaining capacity of the inverter and the influence of distance factors, as provided in Embodiment 1 of the present invention. Detailed Implementation
[0023] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0024] Example 1, referring to Figures 1-3 As an embodiment of the present invention, a harmonic capacity allocation method considering the influence of inverter remaining capacity and distance factors is provided, including: S1: Determine the load nodes, harmonic order, and capacity to be harmonic controlled, obtain the remaining capacity information of each inverter under the distribution area, construct the Norton equivalent model of the distribution area, and determine the harmonic control priority of each inverter based on the line impedance.
[0025] It should be noted that the nodes requiring harmonic mitigation under any distribution substation and the multi-functional inverters that can be used to mitigate harmonic currents are determined, and the grid-connected fundamental apparent power output of each inverter in the distribution substation's intelligent converged terminal is obtained.
[0026] It should be noted that, as referred to Figure 2 The Norton equivalent model involves modeling the line impedance, node admittance, and grid parameters within the distribution substation area to form an equivalent circuit that characterizes the relationship between node voltage and harmonic current.
[0027] The harmonic mitigation priority includes obtaining a comprehensive index of the harmonic mitigation priority for each node of the inverter based on the electrical distance between each harmonic source and the inverter in the distribution substation area and the redistribution of the remaining capacity for harmonic capacity. The comprehensive index of the harmonic mitigation priority is then ranked, and the inverter with the smaller line impedance, the closer the distance, and the larger the comprehensive index of the harmonic mitigation priority has a higher harmonic mitigation priority.
[0028] It should be noted that the comprehensive index for governance priority includes the combined calculated value of line impedance and the remaining capacity available for harmonic capacity redistribution, expressed as: , in, Indicates inverter Harmonic mitigation nodes Comprehensive indicators of governance priorities This represents the electrical distance weighting coefficient, which adjusts the degree of influence of electrical distance on the overall index. When the value is large, the electrical distance has a higher weight in the priority judgment. This represents the remaining capacity weighting coefficient, which adjusts the proportion of the inverter's remaining capacity in the comprehensive index calculation. When the value is large, the remaining capacity has a higher weight in priority judgment. This represents the baseline value of the line impedance, with the electrical distance term normalized. Indicates inverter Harmonic mitigation nodes The equivalent impedance of the lines between them Indicates inverter The remaining capacity during the redistribution phase, Indicates harmonic mitigation node The required capacity for harmonic mitigation.
[0029] The remaining capacity available for harmonic capacity redistribution by the inverter is the difference between the original remaining capacity of the inverter and the required harmonic mitigation capacity of this node, expressed as: , in, This indicates that it can be used for harmonic capacity redistribution. This indicates the rated capacity of the inverter, which is the maximum harmonic apparent power that the inverter can handle under operating conditions. This indicates the grid-connected active power of the inverter, which is the portion of the photovoltaic power currently output by the inverter to the grid.
[0030] It should also be noted that the electrical distance includes the line equivalent impedance parameters and line equivalent admittance parameters of the inverter distance to the node to be harmonic mitigation; the line equivalent impedance parameters include the equivalent line impedance between the inverter and the harmonic mitigation node in the distribution substation area; the line equivalent admittance parameters include the equivalent line admittance between the inverter and the harmonic mitigation node in the distribution substation area.
[0031] It should also be noted that the electrical distance of the inverter can be characterized by either the line equivalent admittance parameter or the line equivalent impedance parameter. The line equivalent admittance parameter and the equivalent impedance parameter are reciprocals of each other, expressed as: , in, This represents the line equivalent admittance parameter, describing the inverter in the distribution substation. Harmonic mitigation nodes The electrical conductivity between two points is determined by the admittance value. A larger admittance value indicates a tighter electrical connection and lower harmonic transmission impedance between the two points. This represents the equivalent impedance parameter of the line, used to characterize the inverter. Harmonic mitigation nodes The line impedance characteristics between them include composite components such as line resistance and reactance.
[0032] S2: Based on the remaining capacity information and harmonic governance priority, construct a harmonic capacity allocation scheme for the distribution station area.
[0033] It should be noted that the harmonic capacity allocation scheme includes establishing a capacity allocation matrix under the constraints of the remaining capacity of the inverter and the priority of harmonic governance, prioritizing the allocation to the inverter at this node, and recursively allocating the remaining unallocated capacity to adjacent nodes according to the harmonic governance priority and the electrical distance ratio.
[0034] S3: Based on the harmonic capacity allocation scheme, obtain the harmonic mitigation capacity of the transformer area and the available mitigation resource capacity of each inverter. Use the Norton equivalent model to determine the relationship between the harmonic distortion capacity and mitigation resources of the transformer area, and determine the harmonic mitigation capacity that each inverter in the transformer area needs to bear.
[0035] It should be noted that the harmonic mitigation capacity of the transformer substation includes the sum of the harmonic mitigation capacities of all inverters under the current substation; the harmonic mitigation capacity includes voltage distortion power, current distortion power, and apparent harmonic power; the harmonic mitigation capacity is expressed as: , in, This indicates the available harmonic mitigation capacity of the inverter; it represents the allocatable capacity of the inverter within its rated capacity range, after deducting the current grid-connected output, that can be used for harmonic mitigation. This indicates the maximum available harmonic control resources in the distribution area. This represents the total number of inverters in the current distribution area. This indicates the index of the number of inverters in the current transformer area.
[0036] Voltage distortion power includes the product of harmonic current and the effective value of fundamental voltage, expressed as: , in, This represents voltage distortion power, quantifying the degree of energy distortion between the fundamental voltage and harmonic current. This represents the effective value of the fundamental voltage. Indicates the first The effective value of the subharmonic current.
[0037] Current distortion power includes the product of the fundamental current and the effective values of the harmonic voltage, expressed as: , in, Indicates the power of current distortion. Indicates the first The effective value of the subharmonic voltage This represents the effective value of the fundamental current.
[0038] The apparent harmonic power includes the product of the harmonic current and the effective value of the harmonic voltage of the same frequency, expressed as: , in, Indicates the apparent power of harmonics. Indicates the first The effective value of the subharmonic current.
[0039] The fundamental apparent power is the three-phase fundamental apparent power, including the fundamental active power. With fundamental reactive power The maximum available governance resource capacity under the distribution area is determined by the remaining capacity of each multi-functional inverter, and is expressed as follows: , , in, This indicates the total remaining capacity of the photovoltaic inverters in the distribution area. Indicates the first The rated capacity of the inverter Indicates the first The inverter is currently connected to the grid and outputting apparent power.
[0040] Based on the magnitude of the harmonic current at each node of interest in the distribution area and the minimum requirement of each node for the total harmonic distortion rate of the grid-connected current, the required capacity for harmonic mitigation in the entire distribution area is calculated.
[0041] For reference Figure 3 As shown, the initial grid-connected current total distortion rate of the node of interest is obtained: , in, Indicates the node under the distribution radio area The initial grid-connected current distortion rate, This represents the node current amplification factor.
[0042] When the total harmonic distortion rate of the grid-connected current at a certain node is less than or equal to 1%, the harmonic current at that node can be considered to be effectively controlled. , in, Indicates the node The maximum control capacity required to complete harmonic current control. Represents a node Effective value of the fundamental frequency of the grid-connected current. This indicates the system's rated voltage, which is the standard operating voltage of the three-phase lines in the distribution area.
[0043] It should also be noted that determining the harmonic mitigation capacity to be borne by each inverter in the distribution area includes the following: when the remaining capacity of the inverters in the local node is sufficient, the inverters shall take priority in borne the harmonic capacity of the local node, and the inverters shall then bear the harmonic capacity of the remaining nodes according to the mitigation priority of the remaining nodes and the remaining capacity limit; when the remaining capacity of the inverters in the local node is insufficient, the harmonic capacity of the remaining nodes shall be allocated in sequence according to the mitigation priority of each inverter and the remaining capacity level.
[0044] Using different types of grid-connected inverters connected under the distribution substation as harmonic mitigation resources, the maximum available harmonic mitigation capacity is obtained based on the rated power and apparent power of the grid-connected fundamental wave output of each inverter, thus clarifying the available harmonic mitigation resources under the distribution substation at different times and their relationship with the required harmonic mitigation capacity.
[0045] Example 2, an embodiment of the present invention, provides a harmonic capacity allocation system that considers the influence of inverter remaining capacity and distance factors, including a priority calculation module, a capacity allocation module, and a dynamic allocation module.
[0046] The priority calculation module is used to construct a Norton equivalent model based on the line impedance, node admittance and grid parameters of the distribution substation, obtain the electrical distance between the inverter and each load node, and generate a comprehensive governance priority index by combining the remaining capacity of the harmonic capacity redistribution.
[0047] The capacity allocation module is used to establish a capacity allocation matrix under capacity constraints based on the inverter's remaining capacity information and governance priority results. It prioritizes the allocation to the inverter at this node and recursively extends the allocation to adjacent nodes according to the electrical distance ratio to form a harmonic capacity allocation scheme.
[0048] The dynamic allocation module is used to calculate the harmonic mitigation capacity of the transformer area and the available mitigation resource capacity of the inverter based on the harmonic capacity allocation scheme. It uses the Norton equivalent model to determine the relationship between harmonic distortion capacity and mitigation resources, and allocates the harmonic mitigation capacity of each inverter level by level according to the mitigation priority.
[0049] This embodiment also provides a computer device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements a personnel positioning safety management visualization analysis system as proposed in the above embodiment.
[0050] This embodiment also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a personnel positioning safety management visualization analysis system as proposed in the above embodiment.
[0051] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0052] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-including system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.
[0053] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.
[0054] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.
[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A harmonic capacity allocation method considering the influence of the remaining capacity of an inverter and distance factors, characterized in that, The method comprises the following steps: Determine the load node, harmonic number and capacity to be treated, obtain the remaining capacity information of each inverter under the distribution area, construct the Norton equivalent model of the distribution area, and determine the harmonic treatment priority of each inverter based on the line impedance; According to the remaining capacity information and the harmonic treatment priority, a harmonic capacity allocation scheme of the distribution area is constructed; Based on the harmonic capacity allocation scheme, the harmonic treatment capacity of the distribution area and the available treatment resource capacity of each inverter are obtained, the relationship between the harmonic distortion capacity of the distribution area and the treatment resource is judged through the Norton equivalent model, and the harmonic treatment capacity that each inverter of the distribution area needs to bear is determined.
2. The method of claim 1, wherein the method further comprises: determining a distance between the load and the inverter; and determining a distance factor based on the distance. The Norton equivalent model comprises: The line impedance, node admittance and grid parameters in the distribution area are equivalent to model, and an equivalent circuit representing the relationship between node voltage and harmonic current is formed. 3.The method of claim 1 or 2, wherein the method further comprises: determining a distance between the load and the inverter; and determining the harmonic capacity of the load based on the distance. The harmonic treatment priority comprises: The electrical distance between each harmonic source and inverter under the distribution area and the remaining capacity after harmonic capacity redistribution are obtained to obtain the treatment priority comprehensive index of the inverter for each node, and the treatment priority comprehensive index is sorted, the smaller the line impedance, the closer the distance, the greater the treatment priority comprehensive index, and the higher the harmonic treatment priority of the inverter; The treatment priority comprehensive index comprises the line impedance and the comprehensive calculation value of the remaining capacity available for harmonic capacity redistribution, and is expressed as: ， wherein, represents the inverter harmonic control node priority comprehensive index, represents the electrical distance weight coefficient, adjusts the influence degree of the electrical distance in the comprehensive index, when the value is large, the electrical distance has higher weight in the priority judgment, represents the residual capacity weight coefficient, adjusts the proportion of the residual capacity of the inverter in the calculation of the comprehensive index, when the value is large, the residual capacity has higher weight in the priority judgment, represents the line impedance reference value, normalizes the electrical distance term, represents the inverter harmonic control node between the line equivalent impedance, represents the inverter residual capacity in the redistribution phase, represents the harmonic control demand capacity of the harmonic control node .
4. The method of claim 3, wherein the method further comprises: determining the distance between the load and the inverter; and determining the distance between the load and the inverter. The electrical distance comprises: The line equivalent impedance parameter and the line equivalent admittance parameter of the inverter from the node to be treated for harmonic treatment; The line equivalent impedance parameter comprises the equivalent line impedance between the inverter and the harmonic treatment node under the distribution area; The line equivalent admittance parameter comprises the equivalent line admittance between the inverter and the harmonic treatment node under the distribution area.
5. The method of claim 1, 2, 4, wherein the method of allocating harmonic capacity considering the influence of the remaining capacity of the inverter and the distance factor is characterized in that: The harmonic capacity allocation scheme comprises: Under the constraints of the remaining capacity of the inverter and the harmonic treatment priority, a capacity allocation matrix is established, the capacity is preferentially allocated to the inverter of the node, and the remaining unallocated capacity is recursively allocated to the adjacent nodes according to the electrical distance proportion based on the harmonic treatment priority.
6. The method of claim 5, wherein the method further comprises: determining a distance between the load and the inverter; and determining a distance factor based on the distance. The harmonic treatment capacity of the distribution area comprises: The sum of the harmonic treatment capacity of all inverters under the current distribution area; The harmonic treatment capacity comprises voltage distortion power, current distortion power and harmonic apparent power; The harmonic treatment capacity is expressed as: ， wherein, represents the available harmonic mitigation capacity of the inverter, the allocable capacity of the inverter for harmonic mitigation after deducting the current grid-connected output within the rated capacity range, represents the rated capacity of the inverter, the maximum harmonic apparent power that the inverter can carry under the operating condition, represents the grid-connected active power of the inverter, the power part of the current photovoltaic power generation output of the inverter to the grid, represents the maximum available harmonic mitigation resource of the distribution substation, represents the total number of inverters in the current substation, represents the inverter quantity index in the current substation.
7. The method for harmonic capacity allocation considering the influence of the remaining capacity of the inverter and the distance factor according to any one of claims 1, 2, 4, 6, wherein: The determination of the harmonic treatment capacity that each inverter of the distribution area needs to bear comprises: When the remaining capacity of the local node inverter is sufficient, the harmonic capacity of the local node is preferentially borne, and the inverter bears the harmonic capacity of the remaining nodes according to the treatment priority of the remaining nodes and the remaining capacity limit; When the remaining capacity of the local node inverter is insufficient, the harmonic capacity of the remaining nodes is sequentially allocated to the remaining nodes according to the treatment priority of each inverter and the remaining capacity.
8. A harmonic capacity allocation system considering the influence of the remaining capacity of the inverter and the distance factor, using the harmonic capacity allocation method considering the influence of the remaining capacity of the inverter and the distance factor according to any one of claims 1 to 7, characterized in that: The method comprises a priority calculation module, a capacity allocation module and a dynamic allocation module; The priority calculation module is used to construct the Norton equivalent model based on the line impedance, node admittance and grid parameters of the distribution area, obtain the electrical distance between the inverter and each load node, and generate the treatment priority comprehensive index in combination with the remaining capacity of the harmonic capacity redistribution; The capacity allocation module is used to establish a capacity allocation matrix under the capacity constraint condition according to the remaining capacity information of the inverters and the governance priority result, preferentially allocate to the inverters of the node, and recursively form a harmonic capacity allocation scheme to the adjacent nodes in proportion to the electrical distance; The dynamic allocation module is used to calculate the harmonic governance capacity of the transformer area and the available governance resource capacity of the inverters based on the harmonic capacity allocation scheme, judge the relationship between the harmonic distortion capacity and the governance resource through the Norton equivalent model, and determine the harmonic governance capacity of each inverter according to the governance priority step by step. 9.A computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the computer device is configured to perform the method according to any one of claims 1-8 when the computer program is executed by the processor. The processor executes the computer program to realize the steps of the harmonic capacity allocation method considering the influence of the remaining capacity of the inverter and the distance factor in any one of claims 1-7.
10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize the steps of the harmonic capacity allocation method considering the influence of the remaining capacity of the inverter and the distance factor in any one of claims 1-7.