Multi-harmonic traceability positioning method, device, equipment and medium

Abstract

The invention discloses a multi-harmonic traceability positioning method, device, equipment and medium, and the method comprises the steps: obtaining the harmonic voltage data and harmonic current data of a to-be-analyzed bus in a multi-harmonic source system, and screening out the preliminary screening data segment with stable fluctuation of each harmonic source; according to the primarily screened data segments, re-screening the data segments with stable fluctuation of each harmonic source by constructing a fluctuation quantity recursion relationship, and solving the harmonic transfer impedance of each harmonic source according to a screening result; and calculating the harmonic influence value of each harmonic source on the to-be-analyzed bus through the harmonic transfer impedance so as to identify the dominant harmonic source. According to the scheme, the harmonic transfer impedance can be accurately calculated, and accurate positioning of multi-harmonic traceability is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of harmonic source positioning in power systems, and in particular to a multi-harmonic source tracing positioning method, device, equipment and medium. Background Art

[0002] With the development of power systems, the access of a large number of power electronic equipment and new energy sources has led to increasingly serious harmonic pollution in the power grid; in actual projects, it is often the case that multiple harmonic sources work together to cause the harmonic voltage content of the bus to be analyzed to exceed the standard. Therefore, it is urgent to quantify the source of each harmonic source, so as to identify the dominant harmonic source of the bus to be analyzed that exceeds the standard. The key to this problem is to accurately obtain the transfer impedance between the bus to be analyzed and each harmonic source.

[0003] When existing methods are used for multi-harmonic source tracing and positioning, when there is correlation between harmonic sources and other harmonic fluctuations, it is impossible to accurately estimate the harmonic transfer impedance, resulting in poor multi-harmonic source tracing and positioning accuracy. Summary of the invention

[0004] In view of the above-mentioned defects, the present invention provides a multi-harmonic source tracing and positioning method, device, equipment and medium, which can accurately calculate the harmonic transfer impedance and achieve accurate positioning of the multi-harmonic source tracing.

[0005] An embodiment of the present invention provides a multi-harmonic source tracing and positioning method, the method comprising: Obtain the harmonic voltage data and harmonic current data of the bus to be analyzed in the multi-harmonic source system, and screen out the initial screening data segment with stable fluctuation of each harmonic source; Based on the initially screened data segments, the data segments with stable fluctuations of each harmonic source are screened again by constructing a recursive relationship of fluctuation quantities, and the harmonic transfer impedance of each harmonic source is solved according to the screening results; The harmonic influence value of each harmonic source on the bus to be analyzed is calculated through the harmonic transfer impedance, so as to identify the dominant harmonic source.

[0006] Preferably, the harmonic voltage data and harmonic current data of the bus to be analyzed in the multi-harmonic source system are obtained, and the initial screening data segments with stable fluctuations of each harmonic source are screened out, including: Constructing a harmonic measurement equation for the multi-harmonic source system; Establishing a vector model of each harmonic source load, and reading the harmonic voltage data and harmonic current data of the bus to be analyzed at several adjacent sampling moments; The screening model is determined by taking the fluctuation stability of each harmonic source at the sampling time as the screening condition; The screening model is solved to obtain data segments where the fluctuations of each harmonic source are stable.

[0007] Furthermore, according to the initially screened data segments, the data segments with stable fluctuations of each harmonic source are screened again by constructing a recursive relationship of fluctuation quantities, and the harmonic transfer impedance of each harmonic source is solved according to the screening results, including: Determining a wave quantity equation based on the harmonic measurement equation; The harmonic fluctuation amount at a certain point in the preliminary screening data segment is used to represent the harmonic fluctuation amount at another point in the preliminary screening data segment, thereby calculating the harmonic error; Solve the harmonic transfer impedance of the bus to be analyzed at different points of the harmonic source load according to the harmonic error and the wave momentum equation; The average value of the harmonic transfer impedance of all points of the harmonic source load to the bus to be analyzed is taken as the harmonic transfer impedance of the harmonic source.

[0008] Preferably, calculating the harmonic influence value of each harmonic source on the bus to be analyzed by the harmonic transfer impedance, thereby identifying the dominant harmonic source, includes: Calculate the harmonic voltage of each harmonic source according to the harmonic transfer impedance of each harmonic source; Calculate the harmonic impact value based on the preset harmonic impact model and the harmonic voltage of each harmonic source; The harmonic source with the largest harmonic impact value is determined as the dominant harmonic source.

[0009] Preferably, the harmonic measurement equation is: ; Among them, U X is the bus to be analyzed Harmonic voltage, I i is the harmonic current generated by the i-th harmonic source load, is the bus to be analyzed The harmonic transfer impedance between the i-th harmonic source load, is the harmonic voltage generated by the i-th harmonic source load, Generate harmonic voltages for other harmonic source loads except the i-th harmonic source load.

[0010] The wave momentum equation is ; The harmonic fluctuation quantity at another point ; Harmonic Error ; Harmonic transfer impedance of the harmonic source load at different points to the bus to be analyzed ; in, is the harmonic voltage fluctuation at the bus to be analyzed, is the bus to be analyzed The harmonic transfer impedance between the i-th harmonic source load, Harmonic source The amount of harmonic current fluctuation generated, The voltage fluctuation amount caused by other harmonic source loads; is the voltage fluctuation amount generated by other harmonic source loads at the mth point in the initial screening data segment, is the voltage fluctuation amount caused by other harmonic source loads at the nth point in the initial screening data segment, Z Xi (n) the harmonic transfer impedance of the harmonic source load to the bus to be analyzed at the nth point in the primary screening data segment, is the harmonic current fluctuation at the mth point in the primary screening data segment, is the harmonic current fluctuation at the nth point in the primary screening data segment, is the harmonic voltage fluctuation at the bus to be analyzed at the mth point in the primary screening data segment, is the harmonic voltage fluctuation at the bus to be analyzed at the nth point in the primary screening data segment, It is the harmonic voltage fluctuation at the bus to be analyzed at the mth point calculated from the nth point.

[0011] The harmonic impact model is: ; Among them, HI i X is the harmonic source of the i-th harmonic source on the bus to be analyzed The harmonic impact value of express The bus to be analyzed at the time Harmonic voltage; express The harmonic voltage of the i-th harmonic source at the moment, yes The harmonic voltage of the i-th harmonic source at the moment is equal to the voltage of the bus to be analyzed. The angle of the harmonic voltage, N is the analysis time.

[0012] Another embodiment of the present invention provides a multi-harmonic source tracing and positioning device, the device comprising: The initial screening module is used to obtain the harmonic voltage data and harmonic current data of the bus to be analyzed in the multi-harmonic source system, and screen out the initial screening data segments with stable fluctuations of each harmonic source; An impedance module is used to screen the data segments with stable fluctuations of each harmonic source again by constructing a recursive relationship of fluctuation amounts according to the initially screened data segments, and solve the harmonic transfer impedance of each harmonic source according to the screening results; The positioning module is used to calculate the harmonic influence value of each harmonic source on the bus to be analyzed through the harmonic transfer impedance, so as to identify the dominant harmonic source.

[0013] An embodiment of the present invention also provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the multi-harmonic source tracing and positioning method as described in any one of the above embodiments is implemented.

[0014] An embodiment of the present invention also provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the multi-harmonic source tracing and positioning method as described in any one of the above embodiments.

[0015] The multi-harmonic source tracing and positioning method, device, equipment and medium provided by the present invention obtain the harmonic voltage data and harmonic current data of the bus to be analyzed in the multi-harmonic source system, and screen out the initial screening data segments with stable fluctuations of each harmonic source; based on the initial screening data segments, the data segments with stable fluctuations of each harmonic source are screened again by constructing a recursive relationship of fluctuation quantity, and the harmonic transfer impedance of each harmonic source is solved according to the screening results; the harmonic influence value of each harmonic source on the bus to be analyzed is calculated by the harmonic transfer impedance, so as to identify the dominant harmonic source. This scheme can accurately calculate the harmonic transfer impedance and realize the accurate positioning of multi-harmonic source tracing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of a multi-harmonic source tracing and positioning method provided by an embodiment of the present invention; Figure 2 is a schematic structural diagram of a multi-harmonic source system provided by an embodiment of the present invention; Figure 3 is a vector diagram of a harmonic source load provided by an embodiment of the present invention; Figure 4 It is a structural diagram of an IEEE14 node test system according to an embodiment of the present invention; Figure 5 It is a structural schematic diagram of a multi-harmonic source tracing and positioning device provided by an embodiment of the present invention; Figure 6 It is a structural diagram of a terminal device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1, is a flow chart of a multi-harmonic source tracing and positioning method provided by an embodiment of the present invention, the method comprising steps S1 to S3: Step S1, obtaining harmonic voltage data and harmonic current data of the bus to be analyzed in the multi-harmonic source system, and screening out the initial screening data segment with stable fluctuation of each harmonic source; Step S2, based on the initially screened data segments, the data segments with stable fluctuations of each harmonic source are screened again by constructing a recursive relationship of fluctuation quantities, and the harmonic transfer impedance of each harmonic source is solved according to the screening results; Step S3, calculating the harmonic influence value of each harmonic source on the bus to be analyzed through the harmonic transfer impedance, so as to identify the dominant harmonic source.

[0019] In the specific implementation of this embodiment, based on the bus harmonic voltage data to be analyzed and each harmonic current data, the data segments with stable fluctuations of other harmonic sources are screened out by the three-point method; Based on the data of the screened data segment, the data segments with stable fluctuations of other harmonic sources are further screened by constructing a recursive relationship of fluctuation quantities, and the harmonic transfer impedance of each harmonic source is solved according to the screening results; The harmonic impact of each harmonic source on the bus to be analyzed is calculated through harmonic transfer impedance, so as to identify the dominant harmonic source.

[0020] The present application solution can solve the problem that the harmonic transfer impedance estimated by the existing method is not accurate enough when other harmonics fluctuate violently. The transfer impedance can be calculated with a small amount of data, and the application scope is wider, which can improve the accuracy of the harmonic transfer impedance, thereby improving the accuracy of harmonic source positioning.

[0021] In another embodiment provided by the present invention, when the above step S1 is specifically implemented, the following steps are performed: See also Figure 2 , is a schematic diagram of the structure of a multi-harmonic source system provided by an embodiment of the present invention. The multi-harmonic source system includes n harmonic sources in a power system acting on a bus X to be analyzed in the power system.

[0022] based on Figure 2 The multi-harmonic source system shown constructs the harmonic measurement equation; Establishing a vector model of each harmonic source load, and reading the harmonic voltage data and harmonic current data of the bus to be analyzed at several adjacent sampling moments; Select the bus voltage and harmonic current data to be analyzed at several adjacent sampling moments, take the fluctuation stability of each harmonic source at the sampling moment as the screening condition, and determine the screening model; The screening model is solved to obtain data segments where the fluctuations of each harmonic source are stable.

[0023] In another embodiment provided by the present invention, the above step S2 specifically includes the following steps: In order to improve the estimation accuracy, based on the initial screening by the three-point method, the fluctuation quantity recursion is used to further screen the data of other harmonic sources with stable fluctuations; Determining a wave quantity equation based on the harmonic measurement equation; Determining the amount of harmonic fluctuation at different points in the primary screening data segment; The harmonic fluctuation amount at a certain point in the preliminary screening data segment is used to represent the harmonic fluctuation amount at another point in the preliminary screening data segment, that is, the other harmonic fluctuation amounts at the mth point in the preliminary screening data segment can be represented by the other harmonic fluctuation amounts at the nth point in the preliminary screening data segment, and then the harmonic error is calculated.

[0024] Solve the harmonic transfer impedance of the bus to be analyzed at different points of the harmonic source load according to the harmonic error and the wave momentum equation; Load the harmonic sources at all points Find the average value, which is the harmonic source load Harmonic transfer impedance of the bus to be analyzed.

[0025] In another embodiment provided by the present invention, the step S3 specifically includes the following steps: When calculating the harmonic impact value of each harmonic source on the busbar to be analyzed based on the obtained harmonic transfer impedance of each harmonic source load, specifically: Calculate the harmonic voltage of each harmonic source according to the harmonic transfer impedance of each harmonic source and the aforementioned harmonic measurement equation; Calculate the harmonic impact value based on the preset harmonic impact model and the harmonic voltage of each harmonic source; The dominant harmonic source can be identified by determining the harmonic source with the largest harmonic impact value as the dominant harmonic source.

[0026] In another embodiment provided by the present invention, when the initial screening is performed by the three-point method, based on Figure 2 The harmonic measurement equation is constructed based on the multi-harmonic source system: ; in, is the node where the bus to be analyzed is located The harmonic transfer impedance between the i-th harmonic source load, node The harmonic voltage at is contributed by two parts: one part is contributed by the harmonic source load Produce, that is is the harmonic voltage generated by the i-th harmonic source load; the other part is generated by other harmonic source loads, that is, Generate harmonic voltage for other harmonic source loads except the i-th harmonic source load, I i is the harmonic current generated by the ith harmonic source, U X is the bus to be analyzed Harmonic voltage; See also Figure 3 , is a vector diagram of the harmonic source load provided by the embodiment of the present invention, with the harmonic source load Take as an example, to establish the vector model of harmonic source load, we have: ; in, yes and The phase angle difference between yes With Z Xi I i The phase angle difference between them.

[0027] The above vector models are squared and then merged to obtain; ; In the formula, yes and The phase angle difference between yes The phase angle.

[0028] Select the bus voltage and harmonic current data to be analyzed at three adjacent sampling moments. Assuming that the fluctuations of other harmonic sources at these three moments are stable, we have: ; in, and ( ) represent the The bus voltage and harmonic currents to be analyzed measured at the time point, and are the real and imaginary parts of the transfer impedance, respectively, and the corresponding R Xi With X Xi Respectively represent The real and imaginary parts of the transfer impedance measured at point ik It is Hour and The phase angle difference between them.

[0029] eliminate and , the screening model is: ; in and are the real and imaginary parts of the harmonic transfer impedance of the i-th harmonic source load, Indicates Hour The value of , , Respectively , , hour The value of X, Y and Z represent the corresponding physical quantities, and a, b and c are the three parts of the screening model.

[0030] In actual working conditions, is a positive number, so the equation has only one positive real solution, namely And it is guaranteed that there is only one positive real number solution. Through the above conditions, it can be considered that the data segments with stable fluctuations of other harmonic sources are screened out.

[0031] It should be noted that in this case, three adjacent sampling moments are used as an example to illustrate the data acquisition and screening process of the bus to be analyzed. In other embodiments, the specific screening process can be performed through other numbers of adjacent sampling moments.

[0032] In another embodiment provided by the present invention, the wave momentum equation can be obtained according to the harmonic measurement equation constructed by the multi-harmonic source system: ;in, is the harmonic voltage fluctuation at the bus to be analyzed, is the bus to be analyzed The harmonic transfer impedance between the i-th harmonic source load, Harmonic source The amount of harmonic current fluctuation generated, The voltage fluctuation amount caused by other harmonic source loads; The initial screening data segment and The wave quantity equations at each point are: ; ; Multiply both sides of the two wave equations by or ,get: ; ; Based on the above two formulas, subtract them and we get: ; From this we can see that is the voltage fluctuation amount generated by other harmonic source loads at the mth point in the initial screening data segment, is the voltage fluctuation amount caused by other harmonic source loads at the nth point in the initial screening data segment, Z Xi(n) the harmonic transfer impedance of the harmonic source load to the bus to be analyzed at the nth point in the primary screening data segment, is the harmonic current fluctuation at the mth point in the primary screening data segment, is the harmonic current fluctuation at the nth point in the primary screening data segment, is the harmonic voltage fluctuation at the bus to be analyzed at the mth point in the primary screening data segment, is the harmonic voltage fluctuation at the bus to be analyzed at the nth point in the primary screening data segment, is the harmonic voltage fluctuation at the bus to be analyzed at the mth point calculated from the nth point, that is: ; Among them, The first All points are data selected by the three-point method, so , .

[0033] According to the above formula, we can calculate , then the harmonic error can be expressed as: ; like , then it is believed that Established.

[0034] The solution can be Harmonic source load at point Harmonic transfer impedance of the bus to be analyzed ; All the obtained Find the average value, which is the harmonic source load Harmonic transfer impedance of the bus to be analyzed .

[0035] In another embodiment provided by the present invention, the harmonic impact value of each harmonic source on the bus to be analyzed is calculated according to the obtained harmonic transfer impedance of each harmonic source load, wherein the harmonic impact value of each harmonic source can be expressed as: ; Among them, HI i X is the harmonic source of the i-th harmonic source on the bus to be analyzed The harmonic impact value of express The bus to be analyzed at the time Harmonic voltage; express The harmonic voltage of the i-th harmonic source at the moment, yes The harmonic voltage of the i-th harmonic source at the moment is equal to the voltage of the bus to be analyzed. The angle of the harmonic voltage, N is the analysis time.

[0036] In another embodiment provided in this application, see Figure 4 , is a schematic diagram of the structure of the IEEE14 node test system according to an embodiment of the present invention. Figure 4 The IEEE14 node is used for simulation test. The IEEE14 node test system includes nodes 1 to 14. Harmonic measurement devices are configured at 5, 6, 11, and 13. Harmonic sources are set on buses 5, 11, and 13, and then the harmonic responsibility of the harmonic source on the bus 6 to be analyzed is obtained. The injection current of each harmonic of the harmonic source is shown in Table 1.

[0037] Table 1 Harmonic current of harmonic source load Take the current in Table 1 as the reference and then add random fluctuations. Set it to 0.1 and solve the harmonic impact value of each node, see Table 2.

[0038] Table 2 Harmonic impact values ​​of each harmonic source Comparing the harmonic influence values ​​of each node in Table 2, the one with a large harmonic influence value is the dominant harmonic source. The simulation results show that the estimated dominant harmonic source is consistent with the actual one, which shows that the positioning accuracy of the harmonic source in this case is relatively high.

[0039] The embodiment of the present invention also provides a multi-harmonic source tracing and positioning device, see Figure 5 , is a schematic diagram of the structure of a multi-harmonic source tracing and positioning device provided by an embodiment of the present invention, the device comprising: The initial screening module is used to obtain the harmonic voltage data and harmonic current data of the bus to be analyzed in the multi-harmonic source system, and screen out the initial screening data segments with stable fluctuations of each harmonic source; An impedance module is used to screen the data segments with stable fluctuations of each harmonic source again by constructing a recursive relationship of fluctuation amounts according to the initially screened data segments, and solve the harmonic transfer impedance of each harmonic source according to the screening results; The positioning module is used to calculate the harmonic influence value of each harmonic source on the bus to be analyzed through the harmonic transfer impedance, so as to identify the dominant harmonic source.

[0040] It should be noted that the multi-harmonic source tracing and positioning device provided in the embodiment of the present invention can execute the multi-harmonic source tracing and positioning method described in any of the above embodiments, and the specific functions of the multi-harmonic source tracing and positioning device are not described in detail here.

[0041] See also Figure 6 , is a schematic diagram of the structure of a terminal device provided in an embodiment of the present invention. The terminal device of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor, such as a multi-harmonic source tracing and positioning program. When the processor executes the computer program, the steps in the above-mentioned multi-harmonic source tracing and positioning method embodiments are implemented, such as Figure 1 Steps S1 to S3 are shown. Or the processor implements the functions of each module in the above-mentioned device embodiments when executing the computer program.

[0042] Exemplarily, the computer program may be divided into one or more modules / units, and the one or more modules / units are stored in the memory and executed by the processor to complete the present invention. The one or more modules / units may be a series of computer program instruction segments that can complete functions, and the instruction segments are used to describe the execution process of the computer program in the terminal device. For example, the computer program may be divided into various modules, and the specific functions of each module are not described again.

[0043] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, and a cloud server. The terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that the schematic diagram is merely an example of a terminal device and does not constitute a limitation on the terminal device. The terminal device may include more or fewer components than shown in the diagram, or may combine certain components, or different components. For example, the terminal device may also include an input / output device, a network access device, a bus, etc.

[0044] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, and uses various interfaces and lines to connect various parts of the entire terminal device.

[0045] The memory can be used to store the computer program and / or module, and the processor realizes various functions of the terminal device by running or executing the computer program and / or module stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0046] Wherein, if the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Wherein, the computer program includes computer program code, and the computer program code can be in code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0047] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A multi-harmonic source tracing and positioning method, characterized in that: The method comprises: Obtain the harmonic voltage data and harmonic current data of the bus to be analyzed in the multi-harmonic source system, and screen out the initial screening data segment with stable fluctuation of each harmonic source; Based on the initially screened data segments, the data segments with stable fluctuations of each harmonic source are screened again by constructing a recursive relationship of fluctuation quantities, and the harmonic transfer impedance of each harmonic source is solved according to the screening results; The harmonic influence value of each harmonic source on the bus to be analyzed is calculated through the harmonic transfer impedance, so as to identify the dominant harmonic source.

2. The multi-harmonic source tracing and positioning method according to claim 1, characterized in that: Obtain the harmonic voltage data and harmonic current data of the bus to be analyzed in the multi-harmonic source system, and filter out the initial screening data segments with stable fluctuations of each harmonic source, including: Constructing a harmonic measurement equation for the multi-harmonic source system; Establishing a vector model of each harmonic source load, and reading the harmonic voltage data and harmonic current data of the bus to be analyzed at several adjacent sampling moments; The screening model is determined by taking the fluctuation stability of each harmonic source at the sampling time as the screening condition; The screening model is solved to obtain data segments where the fluctuations of each harmonic source are stable.

3. The multi-harmonic source tracing and positioning method according to claim 2, characterized in that: According to the initially screened data segments, the data segments with stable fluctuations of each harmonic source are screened again by constructing a recursive relationship of fluctuation quantities, and the harmonic transfer impedance of each harmonic source is solved according to the screening results, including: Determining a wave quantity equation based on the harmonic measurement equation; The harmonic fluctuation amount at a certain point in the preliminary screening data segment is used to represent the harmonic fluctuation amount at another point in the preliminary screening data segment, thereby calculating the harmonic error; Solve the harmonic transfer impedance of the bus to be analyzed at different points of the harmonic source load according to the harmonic error and the wave momentum equation; The average value of the harmonic transfer impedance of all points of the harmonic source load to the bus to be analyzed is taken as the harmonic transfer impedance of the harmonic source.

4. The multi-harmonic source tracing and positioning method according to claim 1, characterized in that: Calculating the harmonic influence value of each harmonic source on the bus to be analyzed by using the harmonic transfer impedance, thereby identifying the dominant harmonic source, including: Calculate the harmonic voltage of each harmonic source according to the harmonic transfer impedance of each harmonic source; Calculate the harmonic impact value based on the preset harmonic impact model and the harmonic voltage of each harmonic source; The harmonic source with the largest harmonic impact value is determined as the dominant harmonic source.

5. The multi-harmonic source tracing and positioning method according to claim 2, characterized in that: The harmonic measurement equation is: ; Among them, U X is the bus to be analyzed Harmonic voltage, I i is the harmonic current generated by the i-th harmonic source load, is the bus to be analyzed The harmonic transfer impedance between the i-th harmonic source load, is the harmonic voltage generated by the i-th harmonic source load, Generate harmonic voltages for other harmonic source loads except the i-th harmonic source load.

6. The multi-harmonic source tracing and positioning method according to claim 3, characterized in that: The wave momentum equation is ; The harmonic fluctuation quantity at another point ; Harmonic Error ; Harmonic transfer impedance of the harmonic source load at different points to the bus to be analyzed ; in, is the harmonic voltage fluctuation at the bus to be analyzed, is the bus to be analyzed The harmonic transfer impedance between the i-th harmonic source load, Harmonic source The amount of harmonic current fluctuation generated, The voltage fluctuation amount caused by other harmonic source loads; is the voltage fluctuation amount generated by other harmonic source loads at the mth point in the initial screening data segment, is the voltage fluctuation amount caused by other harmonic source loads at the nth point in the initial screening data segment, Z Xi (n) the harmonic transfer impedance of the harmonic source load to the bus to be analyzed at the nth point in the primary screening data segment, is the harmonic current fluctuation at the mth point in the primary screening data segment, is the harmonic current fluctuation at the nth point in the primary screening data segment, is the harmonic voltage fluctuation at the bus to be analyzed at the mth point in the primary screening data segment, is the harmonic voltage fluctuation at the bus to be analyzed at the nth point in the primary screening data segment, It is the harmonic voltage fluctuation at the bus to be analyzed at the mth point calculated from the nth point.

7. The multi-harmonic source tracing and positioning method according to claim 4, characterized in that: The harmonic impact model is: ； Among them, HI i X is the harmonic source of the i-th harmonic source on the bus to be analyzed The harmonic impact value of express The bus to be analyzed at the time Harmonic voltage; express The harmonic voltage of the i-th harmonic source at the moment, yes The harmonic voltage of the i-th harmonic source at the moment is equal to the voltage of the bus to be analyzed. The angle of the harmonic voltage, N is the analysis time.

8. A multi-harmonic source tracing and positioning device, characterized in that: The device comprises: The initial screening module is used to obtain the harmonic voltage data and harmonic current data of the bus to be analyzed in the multi-harmonic source system, and screen out the initial screening data segments with stable fluctuations of each harmonic source; An impedance module is used to screen the data segments with stable fluctuations of each harmonic source again by constructing a recursive relationship of fluctuation amounts according to the initially screened data segments, and solve the harmonic transfer impedance of each harmonic source according to the screening results; The positioning module is used to calculate the harmonic influence value of each harmonic source on the bus to be analyzed through the harmonic transfer impedance, so as to identify the dominant harmonic source.

9. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the multi-harmonic source tracing and positioning method as described in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the multi-harmonic source tracing and positioning method according to any one of claims 1 to 7.

Images