A method for detecting and disposing of power supply harmonic flicker

Abstract

A method for detecting and disposing power supply harmonic flicker, which relates to the field of harmonic processing, includes constructing a harmonic source analysis model, obtaining the circuit structure data of distribution network equipment, inputting them into the harmonic source analysis model respectively for identification to obtain a set of primary harmonic source equipment; screening the set of primary harmonic source equipment to obtain a set of intermediate harmonic source equipment; verifying and modifying the set of intermediate harmonic source equipment, outputting the final set of harmonic source equipment and obtaining a set of harmonic simulation parameters for each equipment; obtaining a disposal strategy by using the set of harmonic simulation parameters; performing a second simulation correction by using the disposal strategy and outputting the disposal strategy, etc. The present invention effectively solves the problems of low efficiency in finding harmonic sources and poor treatment effects and increased treatment costs caused by unreasonable treatment means existing in the current harmonic detection and disposal process.

Description

Technical Field

[0001] The present invention relates to the field of harmonic processing, and particularly to a method for detecting and disposing of power supply harmonic flicker. Background Art

[0002] Power supply harmonic flicker is a phenomenon in which the grid voltage fluctuates and flickers due to the presence of harmonic sources in the power system. Harmonic sources generate harmonics during operation, causing the grid voltage to deviate from its normal waveform. Harmonics are voltage or current waveforms whose frequencies are integer multiples of the fundamental frequency in the power system. Harmonics are mainly generated by nonlinear loads, such as rectifiers, inverters, and switched-mode power supplies. When these devices operate, due to their nonlinear characteristics, they inject harmonic currents into the grid, distorting the voltage and current waveforms of the grid. The presence of harmonics has a significant impact on the normal operation of the power system. They can reduce the efficiency of power equipment, increase losses, cause equipment overheating, generate electromagnetic interference, and even lead to instability and faults in the power system.

[0003] The methods for finding harmonic sources mainly rely on monitoring and analyzing the current and voltage in the grid. However, due to the complexity of the grid structure and the diversity of harmonic sources, the location of harmonic sources is often inaccurate. This may lead to misjudgment of harmonic sources, making it impossible to take effective treatment measures. Moreover, the process of finding harmonic sources requires a large amount of time and effort. It is necessary to check each node in the grid one by one and collect and analyze a large amount of data. This not only increases the labor intensity of workers but also may delay the timing of harmonic treatment, further expanding the impact of harmonics on the grid.

[0004] At the same time, most of the current harmonic treatment methods use filters. Filters are divided into active filters and passive filters, and different types of filters have different suppression effects on different types of harmonics. If the filter type is not selected properly or the parameters are set unreasonably, it will not only result in poor results but also increase the treatment cost.

[0005] In summary, the harmonics generated by distribution network equipment cannot be ignored in their impact on the public grid. To effectively control harmonic problems, it is necessary to strengthen the monitoring and analysis of harmonic sources and improve the accuracy of harmonic source location. At the same time, it is necessary to develop more flexible and efficient harmonic treatment means to meet the needs of different grid structures and load characteristics. This will help reduce the impact of harmonics on the grid and improve the stability and transmission efficiency of the grid. Summary of the Invention

[0006] The embodiments of the present invention provide a method for detecting and disposing of power supply harmonic flicker, effectively solving the problems existing in the current harmonic detection and disposal process.

[0007] A method for detecting and disposing of power supply harmonic flicker includes:

[0008] Construct a harmonic source analysis model, obtain the circuit structure data of the distribution network equipment, and input them into the harmonic source analysis model respectively for identification to obtain a set of primary harmonic source equipment;

[0009] Set monitoring points according to the positions of the primary harmonic source equipment respectively, and use harmonic measurement equipment to collect data separately at the monitoring points to obtain detection data;

[0010] Screen the set of primary harmonic source equipment according to the detection data to obtain a set of intermediate harmonic source equipment;

[0011] Verify the set of intermediate harmonic source equipment. If the verification passes, output the set of final harmonic source equipment. If the verification fails, correct and verify the set of intermediate harmonic source equipment until the verification passes and output the set of final harmonic source equipment;

[0012] Construct a simulation model of the equipment according to the circuit structure data of the distribution network equipment, and use the historical operation parameters of the final harmonic source equipment for simulation respectively to obtain a set of harmonic simulation parameters for each equipment;

[0013] Construct a simulation analysis model according to the parameters of the public power grid, import the above harmonic simulation parameters into the simulation analysis model for the first simulation to obtain the influence degree of the public power grid;

[0014] Construct a disposal method analysis model, input the set of harmonic simulation parameters into the disposal method analysis model to obtain a disposal strategy;

[0015] Use the disposal strategy for the second simulation. When the obtained influence degree of the public power grid is lower than the safety threshold and the cost is lower than the set cost threshold, output the disposal strategy.

[0016] Furthermore, the identification process of the primary harmonic source equipment by the harmonic source analysis model includes the following steps:

[0017] Import the circuit structure data of the distribution network equipment into the harmonic source analysis model;

[0018] The harmonic source analysis model identifies the non-linear elements and filtering structures in the circuit structure data;

[0019] Use the circuit structure to analyze the working state of the identified non-linear elements and the filtering structure to judge whether they generate harmonics propagated to the outside;

[0020] When it is identified that there are harmonics propagated to the outside, mark them as primary harmonic source equipment.

[0021] Furthermore, when it is identified that there are harmonics propagated to the outside, according to the set filtering threshold, when it is lower than the filtering threshold, the equipment is excluded, and when it is higher than the filtering threshold.

[0022] Further, the steps of obtaining the intermediate harmonic source device set include:

[0023] Capture the detection data corresponding to a single device in the primary harmonic source device set, and identify the detection data;

[0024] If there are harmonic parameters, mark the primary harmonic source device as an intermediate harmonic source device;

[0025] If there are no harmonic parameters, remove the device from the primary harmonic source device set.

[0026] Further, the steps of verifying the intermediate harmonic source device set are as follows:

[0027] Turn off all primary harmonic source devices, set measurement points to measure the harmonics of the distribution network;

[0028] Identify according to the measurement results. When it is identified that there are harmonics caused by devices, judge that there are missing devices in the current intermediate harmonic source device set, and the verification fails;

[0029] When it is identified that there are no harmonics caused by devices, judge that there are no missing devices in the current intermediate harmonic source device set, and the verification passes;

[0030] Output the intermediate harmonic source devices that pass the verification as the final harmonic source devices.

[0031] Further, the steps of correcting the intermediate harmonic source device set include:

[0032] Use the harmonic source analysis model to re-identify the circuit structure data of the devices outside the primary harmonic source device set;

[0033] Mark the devices with propagated external harmonics as primary harmonic source devices;

[0034] Set detection points, use harmonic measurement equipment to measure the above primary harmonic source devices, obtain detection data, and identify the detection data;

[0035] If there are harmonic parameters, mark the primary harmonic source device as an intermediate harmonic source device and add it to the intermediate harmonic source device set;

[0036] If there are no harmonic parameters, cancel the marking of the device as a primary harmonic source device.

[0037] Further, the harmonic simulation parameter set includes multiple subsets formed in a time series manner according to historical operation parameters, and the subsets include operation parameters, harmonic orders, harmonic amplitudes, harmonic phases, and harmonic distortion rates.

[0038] Further, the impact degree of the public power grid is evaluated based on three dimensions: voltage fluctuation, current distortion, and power factor.

[0039] Further, the disposal strategy is a harmonic suppression strategy. The disposal method analysis model generates corresponding harmonic suppression strategies according to harmonic simulation parameters, including the following:

[0040] First, generate the layout method and parameters of the active filter according to the harmonic simulation parameters;

[0041] Second, generate the layout method and parameters of the passive filter according to the harmonic simulation parameters;

[0042] Third, generate the layout methods and parameters of the active filter and the passive filter according to the harmonic simulation parameters.

[0043] Further, perform a second simulation according to the above harmonic suppression strategy. When the impact degree of the harmonics generated by the distribution network equipment on the public power grid is lower than the safety threshold, output the disposal strategy.

[0044] The beneficial effects of the above technical solutions provided by the embodiments of the present invention at least include:

[0045] 1. In the process of finding harmonic sources in the distribution network, by using the harmonic source analysis model to identify the circuit structure data of the distribution network equipment and performing three-level screening, not only can the harmonic source equipment in the distribution network be accurately identified, but also the steps of existing harmonic source search and detection can be greatly reduced, achieving the effects of improving detection accuracy, speed, and reducing labor intensity.

[0046] 2. The harmonic simulation parameters of the harmonic source equipment under different operating parameters can be obtained according to the simulation. When selecting the disposal strategy, the obtained disposal strategy can be more suitable for the distribution network equipment, not only can better suppress and eliminate harmonics, but also can reduce the governance cost.

[0047] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the written specification, claims, and drawings.

[0048] Next, through the drawings and embodiments, the technical solutions of the present invention will be further described in detail. Description of the Drawings

[0049] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0050] Figure 1Flowchart of the power supply harmonic flicker detection and handling method disclosed in the embodiments of the present invention. Detailed implementation manners

[0051] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art.

[0052] The influence degree of harmonics on the power grid can be comprehensively evaluated from voltage fluctuation, current distortion, and power factor.

[0053] Voltage fluctuation: Harmonics can cause voltage fluctuations in the power grid. Such fluctuations will not only affect the stability of the power grid but may also damage the equipment in the power grid. The voltage fluctuations caused by harmonics may subject the equipment in the power grid to excessive voltage stress, thereby shortening the service life of the equipment.

[0054] Current distortion: Harmonic current is the main cause of current distortion in the power grid. The presence of harmonic current will cause the current waveform in the power grid to deviate from the sine wave, generating various high-order harmonic components. These harmonic components will not only increase the losses of the power grid but may also generate additional thermal effects and mechanical stresses on the equipment in the power grid.

[0055] Power factor: The power factor is an index that measures the proportional relationship between the active power and the apparent power in the power grid. The presence of harmonics will reduce the power factor of the power grid because harmonic power is a part of the reactive power and it will not be converted into useful electrical energy output. The reduction of the power factor will lead to a decrease in the transmission efficiency of the power grid and an increase in the losses of the power grid. In addition, the reduction of the power factor may also subject the equipment in the power grid to excessive reactive power, thereby accelerating the aging process of the equipment.

[0056] As Figure 1 shown, the present invention proposes a power supply harmonic flicker detection and handling method, including:

[0057] S1, constructing a harmonic source analysis model, obtaining the circuit structure data of the distribution network equipment, and respectively inputting them into the harmonic source analysis model for identification to obtain a set of primary harmonic source equipment.

[0058] Among them, the harmonic source analysis model includes a component identification unit and a circuit topology structure analysis unit;

[0059] The component identification unit is used to identify each electronic component in the circuit structure data of the distribution network equipment and analyze the working process of the electronic component;

[0060] The circuit topology analysis unit is used to identify the circuit structure and analyze the operation process of the circuit according to the working process of electronic components, and identify whether harmonic waves are generated and propagated externally.

[0061] The circuit topology analysis unit uses circuit simulation software to model and simulate the circuit structure of the device, identify the generation and propagation of harmonic waves during the simulation process, and identify whether the generated harmonic waves are propagated externally.

[0062] The identification process of the primary harmonic source device by the harmonic source analysis model includes the following steps:

[0063] S11, import the circuit structure data of the distribution network device into the harmonic source analysis model;

[0064] S12, the harmonic source analysis model identifies the nonlinear components and filtering structures in the circuit structure data;

[0065] S13, use the circuit structure to analyze the working state of the identified nonlinear components and the filtering structure, and judge whether they generate harmonic waves propagated to the outside;

[0066] S14, when it is identified that there are harmonic waves propagated to the outside, mark them as primary harmonic source devices.

[0067] In one embodiment, when it is identified that there are harmonic waves propagated to the outside, according to the set filtering threshold, when it is lower than the filtering threshold, the device is removed, and when it is higher than the filtering threshold.

[0068] The functions of the above solution are: removing harmonic sources that have no impact on the public power grid, improving the economy of subsequent harmonic disposal strategies, simplifying the structure adopted by the harmonic disposal strategies, and on the other hand, improving the search speed of harmonic sources and enhancing the efficiency.

[0069] S2, set monitoring points respectively according to the positions of the primary harmonic source devices, and use harmonic measurement equipment to collect data separately at the monitoring points to obtain detection data.

[0070] The detection data includes harmonic source device harmonic parameters and / or blank values and / or equivalent blank values. The harmonic parameters include harmonic order, harmonic amplitude, harmonic phase, and total harmonic distortion rate.

[0071] The equivalent blank value is the harmonic source device harmonic parameter lower than the set threshold. The impact of the harmonic lower than the set threshold on the public power grid can be ignored, and the blank value is the harmonic parameter of the harmonic source device that has not been detected.

[0072] It should be noted that since the public power grid may carry harmonics by itself, it is necessary to filter the harmonics carried by the public power grid before measurement. Among them, suppressing or eliminating the harmonics carried by the public power grid through filtering belongs to the prior art, and its working principle will not be elaborated here.

[0073] S3. Screen the set of primary harmonic source devices according to the detection data to obtain the set of intermediate harmonic source devices.

[0074] The steps to obtain the set of intermediate harmonic source devices include:

[0075] S31. Capture the detection data corresponding to a single device in the set of primary harmonic source devices and identify the detection data.

[0076] S32. If there are harmonic parameters, mark the primary harmonic source device as an intermediate harmonic source device.

[0077] S33. If there are no harmonic parameters, remove the device from the set of primary harmonic source devices.

[0078] Take out the primary harmonic source devices with device harmonic parameters in the set of primary harmonic source devices (if their device harmonic parameters are lower than the set threshold, they are ignored) and mark them as intermediate harmonic source devices, and remove the rest that are not marked.

[0079] S4. Verify the set of intermediate harmonic source devices. If the verification passes, output the final harmonic source device set. If the verification fails, correct and verify the set of intermediate harmonic source devices until the verification passes and output the final harmonic source device set.

[0080] The steps to verify the set of intermediate harmonic source devices are as follows:

[0081] S41. Turn off all primary harmonic source devices, set measurement points, and measure the harmonics of the distribution network.

[0082] S42. Identify according to the measurement results. When it is identified that there are harmonics caused by devices, judge that there are missing devices in the current set of intermediate harmonic source devices, and the verification fails.

[0083] S43. When it is identified that there are no harmonics caused by devices, judge that there are no missing devices in the current set of intermediate harmonic source devices, and the verification passes.

[0084] S44. Output the intermediate harmonic source devices that pass the verification as the final harmonic source devices.

[0085] The steps to correct the set of intermediate harmonic source devices include:

[0086] S45. Use the harmonic source analysis model to re-identify the circuit structure data of the devices outside the set of primary harmonic source devices.

[0087] S46, mark the device with external harmonic propagation as the primary harmonic source device;

[0088] S47, set detection points, use harmonic measurement equipment to measure the above primary harmonic source devices, obtain detection data, and identify the detection data;

[0089] S48, if there are harmonic parameters, mark the primary harmonic source device as an intermediate harmonic source device and add it to the intermediate harmonic source device set;

[0090] S49, if there are no harmonic parameters, cancel the mark of the primary harmonic source device of the device.

[0091] After the intermediate harmonic source devices in the intermediate harmonic source device set pass the verification, change the mark of the intermediate harmonic source device to the final harmonic source device and form the final harmonic source device set.

[0092] S5, construct the simulation model of the device according to the circuit structure data of the distribution network device, and respectively use the historical operation parameters of the final harmonic source device for simulation to obtain the harmonic simulation parameter set of each device.

[0093] The historical operation parameters include: working temperature, working humidity, electromagnetic environment, power supply voltage, power supply frequency, and load condition.

[0094] The simulation process includes:

[0095] S51, use power system simulation software, such as MATLAB / Simulink, PSCAD, etc. to establish the mathematical model of the device;

[0096] S52, input the historical operation parameters into the established device mathematical model;

[0097] S53, set virtual detection points to collect harmonic parameters;

[0098] S54, output the harmonic simulation parameter set according to the time series.

[0099] The harmonic simulation parameter set includes multiple subsets formed according to the historical operation parameters in the time series manner. The subsets include operation parameters, harmonic order, harmonic amplitude, harmonic phase, and harmonic distortion rate.

[0100] S6, construct the simulation analysis model according to the parameters of the public power grid, import the above harmonic simulation parameters into the simulation analysis model for the first simulation to obtain the public power grid influence degree.

[0101] Evaluate the public power grid influence degree according to three dimensions of voltage fluctuation, current distortion, and power factor.

[0102] The evaluation method includes:

[0103] According to the parameters of the public power grid, such as topology, equipment, load, etc., use simulation software to construct a public power grid simulation model based on the parameters of the public power grid.

[0104] Import the harmonic simulation parameter set into the public power grid simulation model and set measurement points at the same time.

[0105] Conduct a simulation and obtain voltage fluctuation, current distortion, and power factor data using the measurement points.

[0106] Evaluate the data obtained at the measurement points according to the set voltage fluctuation threshold, current distortion threshold, and power factor data threshold.

[0107] When any one of the voltage fluctuation, current distortion, and power factor data obtained at the measurement point is greater than the set voltage fluctuation threshold, current distortion threshold, and power factor data threshold, it is determined that the current harmonic parameters have an impact on the public power grid.

[0108] The degree of impact on the public power grid is judged according to the proportion of the voltage fluctuation, current distortion, and power factor data exceeding the voltage fluctuation threshold, current distortion threshold, and power factor data threshold. The level of evaluating the degree of impact on the public power grid is determined according to the set difference ladder. The average value of the proportion of the voltage fluctuation, current distortion, and power factor data exceeding the threshold is used for evaluation, and specific settings can be made according to the actual situation. For example, when the average value is greater than 30%, it is evaluated as a high degree of impact, and when it is less than 10%, it is evaluated as a low degree of impact.

[0109] S7. Construct a disposal method analysis model, import the harmonic simulation parameter set into the disposal method analysis model, and obtain a disposal strategy.

[0110] The disposal strategy is a harmonic suppression strategy. The disposal method analysis model generates corresponding harmonic suppression strategies according to the harmonic simulation parameters, including the following several types:

[0111] The first type is to generate the layout method and parameters of the active filter according to the harmonic simulation parameters.

[0112] The second type is to generate the layout method and parameters of the passive filter according to the harmonic simulation parameters.

[0113] The third type is to generate the layout methods and parameters of the active filter and the passive filter according to the harmonic simulation parameters.

[0114] In the above strategies, the layout method is the node position installed on the distribution network, such as the input / output nodes of the distribution network, and the input / output nodes of the distribution network equipment.

[0115] The above three strategies are used to determine according to different harmonic simulation parameters, and at the same time, according to the setting of the governance cost, to achieve the maximum suppression and elimination of harmonics while minimizing the governance cost.

[0116] This realizes the function of reducing the governance cost and obtaining a better governance effect, that is, selecting a suitable filter scheme and parameters according to the budget and filtering effect requirements, and achieving a balance between the active filter and the passive filter to meet the requirements of economy and filtering effect.

[0117] S8. Use the disposal strategy to perform the second simulation. When the influence degree on the public power grid is lower than the safety threshold and the cost is lower than the set cost threshold, output the disposal strategy.

[0118] Perform the second simulation according to the above harmonic suppression strategy. When the influence degree of the harmonics generated by the distribution network equipment on the public power grid is lower than the safety threshold, output the disposal strategy.

[0119] The above process includes dynamically adjusting the adopted disposal strategy and its structural parameters. When the manufacturing and use cost of its structure is lower than the set governance budget and the effect of suppressing and eliminating harmonics reaches the requirement (when the influence degree on the public power grid obtained in the second simulation is lower than the safety threshold), output the final disposal strategy.

[0120] A method for detecting and disposing power supply harmonic flicker proposed by the present invention in the process of finding harmonic sources in the distribution network. By using a harmonic source analysis model to identify the circuit structure data of the distribution network equipment and performing three-level screening, it can not only accurately identify the harmonic source equipment in the distribution network, but also greatly reduce the steps of existing harmonic source search and detection, achieving the effects of improving detection accuracy, speed and reducing labor intensity. At the same time, according to the harmonic simulation parameters of the harmonic source equipment under different operating parameters obtained by simulation, when selecting the disposal strategy, the obtained disposal strategy can be more suitable for the equipment of the distribution network, not only better suppressing and eliminating harmonics but also reducing the governance cost.

[0121] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the protection scope of the present disclosure. The appended method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy.

[0122] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0123] Those skilled in the art will also appreciate that the various illustrative logic blocks, modules, circuits, and algorithmic steps described in conjunction with the embodiments herein can all be implemented as electronic hardware, computer software, or a combination thereof. In order to clearly illustrate the interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above around their functions. Whether such functions are implemented as hardware or software depends on specific applications and the design constraints imposed on the entire system. A skilled person can implement the described functions in an alternative manner for each specific application, but such implementation decisions should not be interpreted as departing from the scope of protection of the present disclosure.

[0124] The steps of the method or algorithm described in conjunction with the embodiments herein may be directly embodied as hardware, a software module executed by a processor, or a combination thereof. The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a mobile disk, a CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The ASIC may be located in a user terminal. Of course, the processor and the storage medium may also be present in a user terminal as discrete components.

[0125] For software implementation, the techniques described in this application can be implemented with modules (e.g., procedures, functions, etc.) that perform the functions described in this application. These software codes can be stored in a memory unit and executed by a processor. The memory unit can be implemented within the processor or outside the processor. In the latter case, it is coupled to the processor in a communication manner via various means, which are well known in the art.

[0126] The foregoing description includes examples of one or more embodiments. Of course, it is not possible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but those of ordinary skill in the art should recognize that the various embodiments can be further combined and arranged. Accordingly, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. In addition, with respect to the term "comprising" as used in the specification or claims, that term is inclusive in a manner similar to the term "including" as that term is interpreted when used as a transitional word in a claim. Further, any use of the term "or" in the specification or claims is to be meant "non-exclusive or".

Claims

1. A flicker detection method, characterized in that: include: Construct a harmonic source analysis model, obtain the circuit structure data of the distribution network equipment, input them into the harmonic source analysis model for identification, and obtain the primary harmonic source equipment set; The harmonic source analysis model identifies the primary harmonic source equipment in the following steps: Import the circuit structure data of the distribution network equipment into the harmonic source analysis model; The harmonic source analysis model identifies nonlinear elements and filter structures in circuit structure data; Using the circuit structure, the working state and filtering structure of the identified nonlinear element are analyzed to determine whether it generates harmonics that propagate to the outside; When the presence of harmonics propagating to the outside is identified, it is marked as a primary harmonic source device; Monitoring points are set up according to the locations of primary harmonic source equipment, and harmonic measurement equipment is used at the monitoring points to collect data separately to obtain detection data; Screening the primary harmonic source device set according to the detection data to obtain the intermediate harmonic source device set; Verify the intermediate harmonic source device set. If the verification is passed, output the final harmonic source device set. If the verification is not passed, modify and verify the intermediate harmonic source device set until the verification is passed and the final harmonic source device set is output; The steps to verify the set of intermediate harmonic source devices are as follows: Turn off all primary harmonic source equipment and set measurement points to measure harmonics in the distribution network; Identify based on the measurement results. When it is identified that there are harmonics caused by the equipment, it is determined that the equipment is missing from the current intermediate harmonic source equipment set and the verification fails. When it is identified that there is no harmonic caused by the device, it is determined that there is no missing device in the current intermediate harmonic source device set, and the verification is passed; Output the verified intermediate harmonic source equipment as the final harmonic source equipment; The steps to correct the set of intermediate harmonic source devices include: Re-identify the circuit structure data of the equipment outside the primary harmonic source equipment set by using the harmonic source analysis model; Mark the equipment with harmonics propagating to the outside as primary harmonic source equipment; Setting detection points, using harmonic measurement equipment to measure the above-mentioned primary harmonic source equipment, obtaining detection data, and identifying the detection data; If harmonic parameters exist, the primary harmonic source device is marked as an intermediate harmonic source device and added to the intermediate harmonic source device set; If there are no harmonic parameters, cancel the primary harmonic source device mark of the device; The simulation model of the equipment is constructed according to the circuit structure data of the distribution network equipment, and the historical operating parameters of the final harmonic source equipment are used for simulation to obtain the harmonic simulation parameter set of each equipment; A simulation analysis model is constructed according to the parameters of the public power grid, and the above harmonic simulation parameters are imported into the simulation analysis model for the first simulation to obtain the impact of the public power grid; Construct a treatment method analysis model, integrate the harmonic simulation parameters into the treatment method analysis model, and obtain the treatment strategy; The disposal strategy is used for a second simulation, and when the impact on the public power grid is lower than the safety threshold and the cost is lower than the set cost threshold, the disposal strategy is output.

2. The method according to claim 1, characterized in that When the presence of harmonics propagating to the outside is detected, the device is eliminated according to the set filtering threshold. If the value is lower than the filtering threshold, the device is eliminated; if the value is higher than the filtering threshold, the device is filtered out.

3. The method according to claim 1, characterized in that The steps of obtaining the intermediate harmonic source device set include: Capture the detection data corresponding to a single device in the primary harmonic source device set and identify the detection data; If harmonic parameters exist, the primary harmonic source device is marked as an intermediate harmonic source device; If no harmonic parameters exist, the device is removed from the primary harmonic source device set.

4. The method according to claim 1, characterized in that The harmonic simulation parameter set includes a plurality of subsets formed in a time series manner according to historical operating parameters, and the subsets include operating parameters, harmonic orders, harmonic amplitudes, harmonic phases, and harmonic distortion rates.

5. The method according to claim 1, characterized in that The impact of the public power grid is evaluated based on three dimensions: voltage fluctuation, current distortion, and power factor.

6. The method according to claim 1, characterized in that The treatment strategy is the harmonic suppression strategy. The treatment mode analysis model generates the corresponding harmonic suppression strategy according to the harmonic simulation parameters, including the following: The first one is to generate the layout and parameters of the active filter according to the harmonic simulation parameters; The second method is to generate the layout and parameters of the passive filter based on the harmonic simulation parameters; The third method is to generate the arrangement and parameters of active filters and passive filters according to the harmonic simulation parameters.

7. The method according to claim 6, characterized in that A second simulation is performed based on the above harmonic suppression strategy, and a disposal strategy is output when the impact of the harmonics generated by the distribution network equipment on the public power grid is lower than the safety threshold.

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