Multi-harmonic source composite responsibility division method and system

Abstract

The invention provides a multi-harmonic-source composite responsibility division method and system, and relates to the field of electric energy quality, and the method comprises the steps: obtaining the bus superposition harmonic voltage of a multi-harmonic source and the harmonic current of each feeder line; according to the Euclidean distance between the harmonic voltage and each harmonic current, the correlation between the harmonic voltage and the harmonic current is judged, and a harmonic correlation feeder line is selected; according to a Thevenin equivalent circuit established for a harmonic-related feeder line, obtaining a grid-connected point harmonic voltage, and calculating a harmonic impedance and a background harmonic voltage; based on the harmonic impedance and the background harmonic voltage, calculating the harmonic source voltage responsibility of each feeder; according to the method, the feeder lines related to the main harmonic waves are obtained through correlation analysis, then harmonic wave responsibility division is carried out, the method is more suitable for a power grid containing a direct-current line, and repeated calculation of different harmonic wave sources is avoided.

Description

Technical Field

[0001] The present disclosure relates to the field of power quality, and in particular to a method and system for dividing composite responsibilities of multiple harmonic sources. Background Art

[0002] With the rapid growth of installed capacity of new energy sources, the grid structure and load types have undergone tremendous changes, and the demand for power quality has been paid attention to. The access of a large number of various power electronic equipment has led to the emergence of new harmonic source coexistence conditions in the DC system, which has enhanced the randomness and time-varying nature of grid harmonics. Therefore, it is necessary to study reasonable indicators for quantifying harmonic responsibility in the scenario of multiple harmonic sources in the governance system.

[0003] At present, common harmonic responsibility indicators include harmonic active power, harmonic emission level, harmonic current responsibility, etc.; some scholars have proposed to use the direction of harmonic active power / reactive power to identify the main harmonic source, defining positive values ​​as the main harmonic source on the system side and negative values ​​as the main harmonic source on the user side, but this scheme is affected by the phase angle difference and can only divide the responsibility qualitatively; some scholars have proposed to divide the responsibility by using the ratio of harmonic current / voltage and total harmonic current / total harmonic voltage at the grid connection point, but when analyzing the same scenario, the harmonic current responsibility and harmonic voltage responsibility are often inconsistent; therefore, the existing multi-harmonic source composite responsibility division technology has the problems of inaccurate and unstable division. Summary of the invention

[0004] In order to solve the above problems, the present disclosure proposes a method and system for dividing the composite responsibility of multiple harmonic sources. Feeders related to the main harmonics are obtained through correlation analysis, and then harmonic responsibility division is performed. It is more suitable for power grids containing DC lines and avoids repeated calculation of different harmonic sources.

[0005] According to some embodiments, the present disclosure adopts the following technical solutions:

[0006] A method for dividing composite responsibilities of multiple harmonic sources, comprising:

[0007] Obtain the superimposed harmonic voltage of the busbar and the harmonic current of each feeder of multiple harmonic sources;

[0008] According to the Euclidean distance between the harmonic voltage and each harmonic current, the correlation between the harmonic voltage and the harmonic current is determined, and the harmonically related feeders are selected;

[0009] Based on the Thevenin equivalent circuit established for the harmonic-related feeders, the grid-connected point harmonic voltage is obtained, and the harmonic impedance and background harmonic voltage are calculated;

[0010] Based on the harmonic impedance and background harmonic voltage, the harmonic source voltage responsibility of each feeder is calculated.

[0011] Furthermore, the calculation formula of the Euclidean distance is:

[0012]

[0013] Among them, P o represents the Euclidean distance, and x1, y1, x2, and y2 represent the corrected time and amplitude of the harmonic voltage and harmonic current, respectively.

[0014] Furthermore, the correlation between the harmonic voltage and the harmonic current is determined as follows:

[0015] If the Euclidean distance is greater than the first threshold, it is judged that the harmonic voltage and the feeder harmonic current are strongly correlated; if the Euclidean distance is greater than or equal to the second threshold and less than or equal to the first threshold, it is judged that the harmonic voltage and the feeder harmonic current are weakly correlated; if the Euclidean distance is less than the second threshold, it is judged that the harmonic voltage and the feeder harmonic current are not correlated.

[0016] Furthermore, the harmonically correlated feeders are selected, and the strongly correlated and weakly correlated feeders are selected to carry out responsibility division.

[0017] Furthermore, the grid-connected point harmonic voltage is obtained based on the Thevenin equivalent circuit established for the harmonic-related feeder, which is expressed as:

[0018]

[0019] Among them, U pcc Represents the harmonic voltage at the grid connection point, E u and E c Represent the harmonic voltage source on the system side and the harmonic voltage source on the user side, Z u and Z c They represent the harmonic impedance on the system side and the harmonic impedance on the user side respectively.

[0020] Furthermore, the calculation of the harmonic source voltage responsibility of each feeder is expressed by the formula:

[0021]

[0022] in, represents the mth equivalent harmonic impedance at the PCC busbar excluding the feeder, I m Represents the mth harmonic current emitted by the harmonic source load connected to the feeder, Represents the mth background harmonic voltage.

[0023] According to some embodiments, the present disclosure adopts the following technical solutions:

[0024] A multi-harmonic source composite responsibility division system, comprising:

[0025] The data acquisition module is configured to: acquire the superimposed harmonic voltage of the busbar of the multi-harmonic source and the harmonic current of each feeder;

[0026] The feeder selection module is configured to: determine the correlation between the harmonic voltage and the harmonic current according to the Euclidean distance between the harmonic voltage and each harmonic current, and select the harmonically correlated feeder;

[0027] The equivalent calculation module is configured to: obtain the grid connection point harmonic voltage according to the Thevenin equivalent circuit established for the harmonic related feeder, and calculate the harmonic impedance and the background harmonic voltage;

[0028] The responsibility calculation module is configured to calculate the voltage responsibility of the harmonic source of each feeder based on the harmonic impedance and the background harmonic voltage.

[0029] Furthermore, the calculation formula of the Euclidean distance is:

[0030]

[0031] Among them, P o represents the Euclidean distance, and x1, y1, x2, and y2 represent the corrected time and amplitude of the harmonic voltage and harmonic current, respectively.

[0032] Furthermore, the correlation between the harmonic voltage and the harmonic current is determined as follows:

[0033] If the Euclidean distance is greater than the first threshold, it is judged that the harmonic voltage and the feeder harmonic current are strongly correlated; if the Euclidean distance is greater than or equal to the second threshold and less than or equal to the first threshold, it is judged that the harmonic voltage and the feeder harmonic current are weakly correlated; if the Euclidean distance is less than the second threshold, it is judged that the harmonic voltage and the feeder harmonic current are not correlated.

[0034] Furthermore, the harmonically correlated feeders are selected, and the strongly correlated and weakly correlated feeders are selected to carry out responsibility division.

[0035] Furthermore, the grid-connected point harmonic voltage is obtained based on the Thevenin equivalent circuit established for the harmonic-related feeder, which is expressed as:

[0036]

[0037] Among them, U pcc Represents the harmonic voltage at the grid connection point, E u and E c Represent the harmonic voltage source on the system side and the harmonic voltage source on the user side, Z u and Z c They represent the harmonic impedance on the system side and the harmonic impedance on the user side respectively.

[0038] Furthermore, the calculation of the harmonic source voltage responsibility of each feeder is expressed by the formula:

[0039]

[0040] in, represents the mth equivalent harmonic impedance at the PCC busbar excluding the feeder, I m Represents the mth harmonic current emitted by the harmonic source load connected to the feeder, Represents the mth background harmonic voltage.

[0041] According to some embodiments, the present disclosure adopts the following technical solutions:

[0042] A computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the following steps are implemented:

[0043] Obtain the superimposed harmonic voltage of the busbar and the harmonic current of each feeder of multiple harmonic sources;

[0044] According to the Euclidean distance between the harmonic voltage and each harmonic current, the correlation between the harmonic voltage and the harmonic current is determined, and the harmonically related feeders are selected;

[0045] Based on the Thevenin equivalent circuit established for the harmonic-related feeders, the grid-connected point harmonic voltage is obtained, and the harmonic impedance and background harmonic voltage are calculated;

[0046] Based on the harmonic impedance and background harmonic voltage, the harmonic source voltage responsibility of each feeder is calculated.

[0047] According to some embodiments, the present disclosure adopts the following technical solutions:

[0048] A non-transitory computer-readable storage medium is used to store computer instructions. When the computer instructions are executed by a processor, the following steps are implemented:

[0049] Obtain the superimposed harmonic voltage of the busbar and the harmonic current of each feeder of multiple harmonic sources;

[0050] According to the Euclidean distance between the harmonic voltage and each harmonic current, the correlation between the harmonic voltage and the harmonic current is determined, and the harmonically related feeders are selected;

[0051] Based on the Thevenin equivalent circuit established for the harmonic-related feeders, the grid-connected point harmonic voltage is obtained, and the harmonic impedance and background harmonic voltage are calculated;

[0052] Based on the harmonic impedance and background harmonic voltage, the harmonic source voltage responsibility of each feeder is calculated.

[0053] According to some embodiments, the present disclosure adopts the following technical solutions:

[0054] An electronic device comprises: a processor, a memory and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory to implement the following steps:

[0055] Obtain the superimposed harmonic voltage of the busbar and the harmonic current of each feeder of multiple harmonic sources;

[0056] According to the Euclidean distance between the harmonic voltage and each harmonic current, the correlation between the harmonic voltage and the harmonic current is determined, and the harmonically related feeders are selected;

[0057] Based on the Thevenin equivalent circuit established for the harmonic-related feeders, the grid-connected point harmonic voltage is obtained, and the harmonic impedance and background harmonic voltage are calculated;

[0058] Based on the harmonic impedance and background harmonic voltage, the harmonic source voltage responsibility of each feeder is calculated.

[0059] Compared with the prior art, the present invention has the following beneficial effects:

[0060] The present invention firstly calculates the Euclidean distance using the busbar harmonic voltage and the feeder harmonic current; then selects the main harmonic source feeder according to the correlation between the busbar harmonic voltage and the feeder harmonic current; finally, calculates the harmonic impedance and the background harmonic voltage using the feeder harmonic current and the harmonic voltage, and further obtains the harmonic voltage responsibility of each feeder; this method of obtaining the main harmonically related feeders through correlation analysis and then dividing the harmonic responsibility is more suitable for power grids containing DC lines, avoids repeated calculations of different harmonic sources, can reduce the harmonic voltage responsibility calculations of unrelated feeders, and the obtained harmonic responsibility is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The accompanying drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure.

[0062] Figure 1 This is a flow chart of the method of Example 1.

[0063] Figure 2 This is a grid structure diagram of Example 1.

[0064] Figure 3 This is a structural diagram of the Thevenin equivalent circuit of Example 1. DETAILED DESCRIPTION

[0065] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0066] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present disclosure belongs.

[0067] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0068] Example 1

[0069] In one embodiment of the present disclosure, a method for dividing composite responsibilities of multiple harmonic sources is provided, comprising:

[0070] Step S1: Obtain the superimposed harmonic voltage of the busbar of the multi-harmonic source and the harmonic current of each feeder;

[0071] Step S2: judging the correlation between the harmonic voltage and the harmonic current according to the Euclidean distance between the harmonic voltage and each harmonic current, and selecting the harmonically correlated feeder;

[0072] Step S3: obtaining the grid connection point harmonic voltage according to the Thevenin equivalent circuit established for the harmonic related feeder, and calculating the harmonic impedance and background harmonic voltage;

[0073] Step S4: Calculate the harmonic source voltage responsibility of each feeder based on the harmonic impedance and background harmonic voltage.

[0074] As an embodiment, the present invention discloses a method for dividing composite responsibilities of multiple harmonic sources. The method obtains the voltage and current data of the system bus / feeder, processes and performs correlation analysis to obtain the feeders related to the main harmonics; then uses the voltage and current data to calculate the background harmonic voltage and system-side harmonic impedance; finally, uses the obtained harmonic data to calculate the responsibility values ​​of different lines to divide the harmonic responsibilities of different lines. This scheme considers dividing the harmonic responsibility division into two steps. The first step is qualitative analysis: by obtaining the voltage and current data of the system bus / feeder, processing and performing correlation analysis to obtain the feeders related to the main harmonics; the second step is quantitative analysis: then uses the voltage and current data to calculate the background harmonic voltage and system-side harmonic impedance; finally, uses the obtained harmonic data to calculate the responsibility values ​​of different lines to divide the harmonic responsibilities of different lines. This composite responsibility division method that combines qualitative analysis and quantitative analysis is more suitable for power grids containing DC lines, and avoids repeated calculations of different harmonic sources, such as Figure 1 The specific implementation process is as follows:

[0075] 1. Obtain the superimposed harmonic voltage of multiple harmonic sources on the bus and the harmonic current of each feeder.

[0076] Taking the 500kV AC system busbar of a UHV converter station as an example, the 5th harmonic voltage exceeds the standard, and the grid structure is as follows: Figure 2 As shown, the voltage and current data of the system busbar / feeder are obtained, where the 5th harmonic current of each feeder is shown in Table 1:

[0077] Table 1 The fifth harmonic current of each feeder

[0078]

[0079] 2. Calculate the Euclidean distance between harmonic voltage and each harmonic current. The formula is as follows:

[0080]

[0081] Among them, P o represents the Euclidean distance, and x1, y1, x2, and y2 represent the corrected time and amplitude of the harmonic voltage and harmonic current, respectively.

[0082] Furthermore, the Euclidean distance is normalized, and the formula is:

[0083]

[0084] Among them, p max 、p min Represent the maximum and minimum values ​​of the Euclidean distance, respectively.

[0085] Figure 2 The Euclidean distances of the fifth harmonic current and harmonic voltage of each line of the grid structure are shown in Table 2, where the filter is a component connected to the busbar, and each row of data in the table represents the Euclidean distance between the line and the busbar:

[0086] Table 2 Euclidean distance table

[0087]

[0088] 3. According to the correlation between harmonic voltage and each harmonic current, the harmonic power flow is judged. According to the strength of the correlation, the relationship between the busbar harmonic voltage and the feeder harmonic current is judged, which can be expressed by the formula:

[0089]

[0090] Specifically, if the Euclidean distance is greater than 0.8, it is judged that the harmonic voltage and the feeder harmonic current are strongly correlated; if the Euclidean distance is greater than or equal to 0.6 and less than or equal to 0.8, it is judged that the harmonic voltage and the feeder harmonic current are weakly correlated; if the Euclidean distance is less than 0.6, it is judged that the harmonic voltage and the feeder harmonic current are uncorrelated; then, the strongly correlated and weakly correlated feeders are selected for responsibility division.

[0091] According to Table 2, the correlation analysis between the harmonic current content of each line and the 5th harmonic voltage of the power supply bus is as follows:

[0092] (1) AC filters (the third, fourth and fifth groups) are linear components and do not generate harmonic currents themselves. Their fifth harmonic currents are relatively large and their correlation coefficients with the fifth harmonic voltage of the power supply bus are all above 0.97. The fifth harmonic current of the AC filter incoming line is generated by the fifth harmonic voltage of the bus on the filter harmonic impedance;

[0093] (2) The fifth harmonic current content of lines D and E is relatively small, and the linear correlation coefficient with the fifth harmonic voltage of the bus is small. They are not the dominant harmonic source causing the fifth harmonic voltage of the 500kV bus.

[0094] (3) Under certain operating conditions of the AC filter, there is a high correlation between the fifth harmonic current of line F, line G, line H, line A, line B, line C, #2 main transformer, and #4 main transformer and the fifth harmonic voltage of the bus.

[0095] 4. Perform Thevenin circuit equivalence on the relevant feeder and bus. The equivalent circuit is as follows: Figure 3 As shown, according to the Thevenin equivalent circuit, the grid-connected point harmonic voltage is obtained, and the expression is as follows:

[0096]

[0097] Where: E u and E c Represent the harmonic voltage source on the system side and the harmonic voltage source on the user side, Z u and Z c Represent the harmonic impedance of the system side and the harmonic impedance of the user side, U pcc Represents harmonic voltage.

[0098] 5. According to the superposition theorem, because the harmonic voltage The mth harmonic voltage generated by the harmonic source connected to the feeder at the PCC busbar and the mth background harmonic voltage generated by all other harmonic sources The phase sum, so, the mth background harmonic voltage The calculation formula is:

[0099]

[0100] Among them, I m Represents the mth harmonic current emitted by the harmonic source load connected to the feeder, Represents the mth equivalent harmonic impedance at the PCC busbar excluding the feeder, and the calculation formula is:

[0101]

[0102] Among them, Δu and Δi represent the fluctuation values ​​of harmonic voltage and harmonic current respectively.

[0103] The fifth harmonic impedance is calculated based on the harmonic voltage and harmonic current fluctuation values, as shown in Table 3:

[0104] Table 3 5th harmonic impedance table

[0105] parameter impedance C Line 77.6 A Line 181 H Line 573.8 Line B 152.1 G Line 572.6 F Line 417.1 #2 Main Transformer 269.73 #4 Main Transformer 137.7

[0106] The 5th background harmonic voltage is obtained, as shown in Table 4:

[0107] Table 4 5th background harmonic voltage table

[0108]

[0109]

[0110] 6. Calculate the harmonic voltage responsibility of the harmonic source load connected to the feeder. The formula is:

[0111]

[0112] in, represents the mth equivalent harmonic impedance at the PCC busbar excluding the feeder, I m Represents the mth harmonic current emitted by the harmonic source load connected to the feeder, Represents the mth background harmonic voltage.

[0113] According to the above formula, the voltage responsibility zr of each feeder harmonic source is calculated separately, as shown in Table 5:

[0114] Table 5 Responsibility table of the fifth harmonic voltage of each feeder

[0115] parameter Harmonic voltage liability C Line 0.349 A Line 0.396 H Line 0.872 Line B 0.567 G Line 0.867 F Line 0.838 #2 Main Transformer 0.325 #4 Main Transformer 0.378

[0116] Example 2

[0117] In one embodiment of the present disclosure, a multi-harmonic source composite responsibility division system is provided, comprising:

[0118] The data acquisition module is configured to: acquire the superimposed harmonic voltage of the busbar of the multi-harmonic source and the harmonic current of each feeder;

[0119] The feeder selection module is configured to: determine the correlation between the harmonic voltage and the harmonic current according to the Euclidean distance between the harmonic voltage and each harmonic current, and select the harmonically correlated feeder;

[0120] The equivalent calculation module is configured to: obtain the grid connection point harmonic voltage according to the Thevenin equivalent circuit established for the harmonic related feeder, and calculate the harmonic impedance and the background harmonic voltage;

[0121] The responsibility calculation module is configured to calculate the voltage responsibility of the harmonic source of each feeder based on the harmonic impedance and the background harmonic voltage.

[0122] Furthermore, the calculation formula of the Euclidean distance is:

[0123]

[0124] Among them, P o represents the Euclidean distance, and x1, y1, x2, and y2 represent the corrected time and amplitude of the harmonic voltage and harmonic current, respectively.

[0125] Furthermore, the correlation between the harmonic voltage and the harmonic current is determined as follows:

[0126] If the Euclidean distance is greater than the first threshold, it is judged that the harmonic voltage and the feeder harmonic current are strongly correlated; if the Euclidean distance is greater than or equal to the second threshold and less than or equal to the first threshold, it is judged that the harmonic voltage and the feeder harmonic current are weakly correlated; if the Euclidean distance is less than the second threshold, it is judged that the harmonic voltage and the feeder harmonic current are not correlated.

[0127] Furthermore, the harmonically correlated feeders are selected, and the strongly correlated and weakly correlated feeders are selected to carry out responsibility division.

[0128] Furthermore, the grid-connected point harmonic voltage is obtained based on the Thevenin equivalent circuit established for the harmonic-related feeder, which is expressed as:

[0129]

[0130] Among them, U pcc Represents the harmonic voltage at the grid connection point, E u and E c Represent the harmonic voltage source on the system side and the harmonic voltage source on the user side, Z u and Z c They represent the harmonic impedance on the system side and the harmonic impedance on the user side respectively.

[0131] Furthermore, the calculation of the harmonic source voltage responsibility of each feeder is expressed by the formula:

[0132]

[0133] in, represents the mth equivalent harmonic impedance at the PCC busbar excluding the feeder, I m Represents the mth harmonic current emitted by the harmonic source load connected to the feeder, Represents the mth background harmonic voltage.

[0134] Example 3

[0135] In one embodiment of the present disclosure, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the following steps are implemented:

[0136] Obtain the superimposed harmonic voltage of the busbar and the harmonic current of each feeder of multiple harmonic sources;

[0137] According to the Euclidean distance between the harmonic voltage and each harmonic current, the correlation between the harmonic voltage and the harmonic current is determined, and the harmonically related feeders are selected;

[0138] Based on the Thevenin equivalent circuit established for the harmonic-related feeders, the grid-connected point harmonic voltage is obtained, and the harmonic impedance and background harmonic voltage are calculated;

[0139] Based on the harmonic impedance and background harmonic voltage, the harmonic source voltage responsibility of each feeder is calculated.

[0140] Example 4

[0141] In one embodiment of the present disclosure, a non-transitory computer-readable storage medium is provided, wherein the non-transitory computer-readable storage medium is used to store computer instructions. When the computer instructions are executed by a processor, the following steps are implemented:

[0142] Obtain the superimposed harmonic voltage of the busbar and the harmonic current of each feeder of multiple harmonic sources;

[0143] According to the Euclidean distance between the harmonic voltage and each harmonic current, the correlation between the harmonic voltage and the harmonic current is determined, and the harmonically related feeders are selected;

[0144] Based on the Thevenin equivalent circuit established for the harmonic-related feeders, the grid-connected point harmonic voltage is obtained, and the harmonic impedance and background harmonic voltage are calculated;

[0145] Based on the harmonic impedance and background harmonic voltage, the harmonic source voltage responsibility of each feeder is calculated.

[0146] Example 5

[0147] In one embodiment of the present disclosure, an electronic device is provided, including: a processor, a memory, and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory, and implements the following steps:

[0148] Obtain the superimposed harmonic voltage of the busbar and the harmonic current of each feeder of multiple harmonic sources;

[0149] According to the Euclidean distance between the harmonic voltage and each harmonic current, the correlation between the harmonic voltage and the harmonic current is determined, and the harmonically related feeders are selected;

[0150] Based on the Thevenin equivalent circuit established for the harmonic-related feeders, the grid-connected point harmonic voltage is obtained, and the harmonic impedance and background harmonic voltage are calculated;

[0151] Based on the harmonic impedance and background harmonic voltage, the harmonic source voltage responsibility of each feeder is calculated.

[0152] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0153] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0154] Although the above describes the specific implementation methods of the present disclosure in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present disclosure. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present disclosure, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present disclosure.

Claims

1. A method for dividing the composite responsibilities of multiple harmonic sources, characterized in that: include: Obtain the superimposed harmonic voltage of the busbar and the harmonic current of each feeder of multiple harmonic sources; According to the Euclidean distance between the harmonic voltage and each harmonic current, the correlation between the harmonic voltage and the harmonic current is determined, and the harmonically related feeders are selected; Based on the Thevenin equivalent circuit established for the harmonic-related feeders, the grid-connected point harmonic voltage is obtained, and the harmonic impedance and background harmonic voltage are calculated; Based on the harmonic impedance and background harmonic voltage, the harmonic source voltage responsibility of each feeder is calculated.

2. A method for dividing composite responsibilities of multiple harmonic sources as claimed in claim 1, characterized in that: The calculation formula of the Euclidean distance is: Among them, P o represents the Euclidean distance, and x1, y1, x2, and y2 represent the corrected time and amplitude of the harmonic voltage and harmonic current, respectively.

3. A method for dividing composite responsibilities of multiple harmonic sources as claimed in claim 1, characterized in that: The determination of the correlation between the harmonic voltage and the harmonic current is specifically as follows: If the Euclidean distance is greater than the first threshold, it is determined that the harmonic voltage and the feeder harmonic current are strongly correlated; if the Euclidean distance is greater than or equal to the second threshold and less than or equal to the first threshold, it is determined that the harmonic voltage and the feeder harmonic current are weakly correlated; If the Euclidean distance is less than the second threshold, it is determined that the harmonic voltage and the feeder harmonic current are unrelated.

4. A method for dividing composite responsibilities of multiple harmonic sources as claimed in claim 3, characterized in that: The harmonically correlated feeders are selected, and the strongly correlated and weakly correlated feeders are selected to carry out responsibility division.

5. A method for dividing composite responsibilities of multiple harmonic sources as claimed in claim 1, characterized in that: The basis is the Thevenin equivalent circuit established for the harmonic related feeder, and the grid connection point harmonic voltage is obtained, which is expressed by the formula: Among them, U pcc Represents the harmonic voltage at the grid connection point, E u and E c Represent the harmonic voltage source on the system side and the harmonic voltage source on the user side, Z u and Z c They represent the harmonic impedance on the system side and the harmonic impedance on the user side respectively.

6. A method for dividing composite responsibilities of multiple harmonic sources as claimed in claim 1, characterized in that: The calculation of the harmonic source voltage responsibility of each feeder is expressed by the formula: in, represents the mth equivalent harmonic impedance at the PCC busbar excluding the feeder, I m Represents the mth harmonic current emitted by the harmonic source load connected to the feeder, Represents the mth background harmonic voltage.

7. A multi-harmonic source composite responsibility division system, characterized in that: include: The data acquisition module is configured to: acquire the superimposed harmonic voltage of the busbar of the multi-harmonic source and the harmonic current of each feeder; The feeder selection module is configured to: determine the correlation between the harmonic voltage and the harmonic current according to the Euclidean distance between the harmonic voltage and each harmonic current, and select the harmonically correlated feeder; The equivalent calculation module is configured to: obtain the grid connection point harmonic voltage according to the Thevenin equivalent circuit established for the harmonic related feeder, and calculate the harmonic impedance and the background harmonic voltage; The responsibility calculation module is configured to calculate the voltage responsibility of the harmonic source of each feeder based on the harmonic impedance and the background harmonic voltage.

8. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, a method for dividing composite responsibilities of multiple harmonic sources as described in any one of claims 1 to 6 is implemented.

9. A non-transitory computer-readable storage medium, characterized in that: The non-transitory computer-readable storage medium is used to store computer instructions, and when the computer instructions are executed by the processor, a method for dividing composite responsibilities of multiple harmonic sources as described in any one of claims 1-6 is implemented.

10. An electronic device, characterized in that: include: A processor, a memory and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory to enable the electronic device to implement a multi-harmonic source composite responsibility division method as described in any one of claims 1-6.

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