Power supply harmonic flicker detection processing method

Abstract

A power supply harmonic flicker detection processing method relates to the field of harmonic processing, and comprises the following steps: constructing a harmonic source analysis model, obtaining circuit structure data of power distribution network equipment, and respectively inputting the circuit structure data into the harmonic source analysis model for identification to obtain a primary harmonic source equipment set; screening the primary harmonic source equipment set to obtain an intermediate harmonic source equipment set; verifying and modifying the intermediate harmonic source device set, outputting a final harmonic source device set, and obtaining a harmonic simulation parameter set of each device; obtaining a disposal strategy by using the harmonic simulation parameter set; according to the method, the problems that the effect is poor and the treatment cost is increased due to the fact that the harmonic source searching efficiency is low and the treatment means is unreasonable in the current harmonic detection treatment process are effectively solved.

Description

Technical Field

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

[0002] Power supply harmonic flicker is caused by the presence of harmonic sources in the power system. Harmonic source equipment generates harmonics during operation, causing the grid voltage to fluctuate and flicker. Harmonics are voltage or current waveforms with frequencies that are integer multiples of the fundamental frequency in the power system. Harmonics are mainly generated by nonlinear loads, such as rectifiers, inverters, switching power supplies, etc. When these devices are working, due to their nonlinear characteristics, they will inject harmonic currents into the grid, causing the voltage and current waveforms of the grid to be distorted. The presence of harmonics has a significant impact on the normal operation of the power system. They will reduce the efficiency of power equipment, increase losses, cause equipment overheating, generate electromagnetic interference, and may even cause instability and failure of the power system.

[0003] The method of finding harmonic sources mainly relies on monitoring and analyzing the current and voltage in the power grid. However, due to the complexity of the power grid structure and the diversity of harmonic sources, the location of harmonic sources is often not accurate enough. This may lead to misjudgment of the harmonic source, making it impossible to take effective control measures, and the process of finding harmonic sources takes a lot of time and effort. It is necessary to check each node in the power grid one by one, and collect and analyze a large amount of data. This not only increases the labor intensity of the staff, but also may delay the timing of harmonic control, resulting in further expansion of the impact of harmonics on the power grid.

[0004] At the same time, most of the harmonic treatment methods currently used are to install filters. Filters are divided into active filters and passive filters. Different types of filters have different suppression effects on different types of harmonics. If the filter is improperly selected or the parameters are set unreasonably, it will not only cause poor results, but also increase the cost of treatment.

[0005] In summary, the impact of harmonics generated by distribution network equipment on the public power grid cannot be ignored. In order to effectively control the harmonic problem, it is necessary to strengthen the monitoring and analysis of harmonic sources and improve the positioning accuracy of harmonic sources; at the same time, it is necessary to develop more flexible and efficient harmonic control methods to meet the needs of different power grid structures and load characteristics. This will help reduce the impact of harmonics on the power grid and improve the stability and transmission efficiency of the power grid. Summary of the invention

[0006] The embodiment of the present invention provides a method for detecting and processing power supply harmonic flicker, which effectively solves the problems existing in the current harmonic detection and processing process.

[0007] A method for detecting and treating power supply harmonic flicker, comprising:

[0008] 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;

[0009] 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;

[0010] Screening the primary harmonic source device set according to the detection data to obtain the intermediate harmonic source device set;

[0011] 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;

[0012] 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;

[0013] 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;

[0014] Construct a treatment method analysis model, integrate the harmonic simulation parameters into the treatment method analysis model, and obtain the treatment strategy;

[0015] 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.

[0016] Furthermore, the harmonic source analysis model includes the following steps to identify the primary harmonic source equipment:

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

[0018] The harmonic source analysis model identifies nonlinear elements and filter structures in circuit structure data;

[0019] 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;

[0020] When the presence of harmonics propagating to the outside is identified, it is marked as a primary harmonic source device.

[0021] Furthermore, when it is identified that there are harmonics propagating to the outside, according to the set filtering threshold, when it is lower than the filtering threshold, the device is eliminated, and when it is higher than the filtering threshold, the device is filtered out.

[0022] Furthermore, the step of obtaining the intermediate harmonic source device set includes:

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

[0024] If harmonic parameters exist, the primary harmonic source equipment is marked as an intermediate harmonic source equipment;

[0025] If no harmonic parameters exist, the device is removed from the primary harmonic source device set.

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

[0027] Turn off all primary harmonic source equipment and set measurement points to measure harmonics in the distribution network;

[0028] 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.

[0029] 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;

[0030] The verified intermediate harmonic source device is output as the final harmonic source device.

[0031] Furthermore, the step of correcting the intermediate harmonic source device set includes:

[0032] Re-identify the circuit structure data of the equipment outside the primary harmonic source equipment set by using the harmonic source analysis model;

[0033] Mark the equipment with harmonics propagating to the outside as primary harmonic source equipment;

[0034] Setting detection points, using harmonic measurement equipment to measure the above-mentioned primary harmonic source equipment, obtaining detection data, and identifying the detection data;

[0035] 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;

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

[0037] Furthermore, 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.

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

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

[0040] The first one is to generate the layout and parameters of the active filter according to the harmonic simulation parameters;

[0041] The second method is to generate the layout and parameters of the passive filter based on the harmonic simulation parameters;

[0042] The third method is to generate the arrangement and parameters of active filters and passive filters according to the harmonic simulation parameters.

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

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

[0045] 1. In the process of searching for harmonic sources in the distribution network, the harmonic source analysis model is used to identify the circuit structure data of the distribution network equipment and perform three-level screening. This 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, thereby improving the detection accuracy and speed and reducing labor intensity.

[0046] 2. The harmonic simulation parameters of the harmonic source equipment under different operating parameters can be obtained based on the simulation. When selecting the treatment strategy, the obtained treatment strategy can be more suitable for the equipment in the distribution network, which can not only better suppress and eliminate harmonics but also reduce the management cost.

[0047] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0048] The technical solution of the present invention is further described in detail below through the drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying 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 of the present invention. In the accompanying drawings:

[0050] Figure 1The present invention is a flowchart of a method for detecting and handling power supply harmonic flicker disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying 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 to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0052] The impact 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 not only affect the stability of the power grid, but may also damage the equipment in the power grid. Voltage fluctuations caused by harmonics may cause excessive voltage stress on the equipment in the power grid, 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 and generate various high-order harmonic components. These harmonic components will not only increase the loss of the power grid, but may also cause additional thermal effects and mechanical stress on the equipment in the power grid.

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

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

[0057] S1, 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.

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

[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 the electronic components to identify whether harmonics that propagate externally are generated.

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

[0062] The harmonic source analysis model identifies the primary harmonic source equipment in the following steps:

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

[0064] S12, a harmonic source analysis model identifies nonlinear elements and filter structures in circuit structure data;

[0065] S13, using the circuit structure, analyzing the working state and filtering structure of the identified nonlinear element to determine whether it generates harmonics that propagate to the outside;

[0066] S14, when it is identified that there are harmonics propagating to the outside, it is marked as a primary harmonic source device.

[0067] In one embodiment, when it is identified that there are harmonics propagating to the outside, according to a set filtering threshold, if the value is lower than the filtering threshold, the device is eliminated, and if the value is higher than the filtering threshold, the device is filtered out.

[0068] The above scheme can eliminate harmonic sources that have no impact on the public power grid, improve the economy of subsequent harmonic treatment strategies, simplify the structure adopted by harmonic treatment strategies, and improve the speed of finding harmonic sources and improve efficiency.

[0069] S2, setting monitoring points according to the locations of the primary harmonic source devices, and using harmonic measurement devices to collect data at the monitoring points to obtain detection data.

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

[0071] The equivalent blank value is the harmonic parameter of the harmonic source equipment that is lower than the set threshold. The impact of harmonics below the set threshold on the public power grid can be ignored. The blank value is the harmonic parameter of the harmonic source equipment that is not detected.

[0072] It should be noted that since the public power grid may have its own harmonics, it is necessary to filter the harmonics of the public power grid before measurement. Among them, the use of filtering to suppress or eliminate the harmonics of the public power grid belongs to the existing technology, and its working principle will not be repeated here.

[0073] S3, screening the primary harmonic source device set according to the detection data to obtain the intermediate harmonic source device set.

[0074] The steps of obtaining the intermediate harmonic source device set include:

[0075] S31, capturing detection data corresponding to a single device in the primary harmonic source device set, and identifying the detection data;

[0076] S32, if there are harmonic parameters, marking the primary harmonic source device as an intermediate harmonic source device;

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

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

[0079] S4, verifying the intermediate harmonic source device set, if the verification is passed, outputting the final harmonic source device set, if the verification is not passed, correcting and verifying the intermediate harmonic source device set, until the verification is passed and the final harmonic source device set is output.

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

[0081] S41, shut down all primary harmonic source devices and set measurement points to measure harmonics on the distribution network;

[0082] S42, identifying according to the measurement results, and when it is identified that there are harmonics caused by the device, determining that the device is missing from the current intermediate harmonic source device set, and the verification fails;

[0083] S43, 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;

[0084] S44, outputting the verified intermediate harmonic source device as the final harmonic source device.

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

[0086] S45, re-identifying circuit structure data of devices outside the primary harmonic source device set using the harmonic source analysis model;

[0087] S46, marking the equipment having harmonics propagating to the outside as primary harmonic source equipment;

[0088] S47, setting a detection point, using a harmonic measurement device to measure the primary harmonic source device, obtaining detection data, and identifying 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 is no harmonic parameter, cancel the primary harmonic source device mark of the device.

[0091] After the intermediate harmonic source device in the intermediate harmonic source device set is verified to be passed, the tag of the intermediate harmonic source device is changed to the final harmonic source device, and the final harmonic source device set is formed.

[0092] S5, constructing a simulation model of the equipment according to the circuit structure data of the distribution network equipment, and using the historical operating parameters of the final harmonic source equipment to perform simulations, to obtain a set of harmonic simulation parameters for each device.

[0093] Historical operating parameters include: operating temperature, operating humidity, electromagnetic environment, power supply voltage, power supply frequency, and load conditions.

[0094] The simulation process includes:

[0095] S51, use power system simulation software, such as MATLAB / Simulink, PSCAD, etc. to build mathematical models of equipment;

[0096] S52, inputting historical operating parameters into the established equipment mathematical model;

[0097] S53, setting a virtual detection point to collect harmonic parameters;

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

[0099] 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.

[0100] S6, constructing a simulation analysis model according to the parameters of the public power grid, importing the above harmonic simulation parameters into the simulation analysis model to perform a first simulation, and obtaining the impact of the public power grid.

[0101] The impact of the public power grid is evaluated based on three dimensions: voltage fluctuation, current distortion, and power factor.

[0102] Evaluation methods include:

[0103] According to the parameters of the public power grid, such as topological structure, equipment, and other parameters, the simulation software is used to construct a public power grid simulation model according to the parameters of the public power grid;

[0104] Import the harmonic simulation parameter set into the public power grid simulation model and set the measurement points;

[0105] Conduct simulation and use measurement points to obtain voltage fluctuation, current distortion, and power factor data;

[0106] Evaluate the data obtained from the measurement point 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 measuring 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 impact of the public power grid is judged based on the proportion of voltage fluctuation, current distortion, and power factor data exceeding the voltage fluctuation threshold, current distortion threshold, and power factor data threshold. The level of public power grid impact evaluation is determined according to the set difference step. The average of the proportion of the voltage fluctuation, current distortion, and power factor data exceeding the threshold is used for evaluation. Specific settings can be made based on actual conditions. For example, when the average is greater than 30%, the impact is high, and when it is less than 10%, the impact is low.

[0109] S7, constructing a treatment method analysis model, integrating the harmonic simulation parameters into the treatment method analysis model, and obtaining a treatment strategy.

[0110] 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:

[0111] The first one is to generate the layout and parameters of the active filter according to the harmonic simulation parameters;

[0112] The second method is to generate the layout and parameters of the passive filter based on the harmonic simulation parameters;

[0113] The third method is to generate the arrangement and parameters of active filters and passive filters according to the harmonic simulation parameters.

[0114] In the above strategies, the layout method is to install the nodes on the distribution network, such as the input / output nodes of the distribution network, and the input and 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 control cost, to achieve maximum suppression and elimination of harmonics while minimizing the control cost.

[0116] This can reduce the cost of governance and achieve better governance effects. That is, according to the budget and filtering effect requirements, the appropriate filter scheme and parameters are selected, and a balance is achieved between active filters and passive filters to meet the requirements of economy and filtering effect.

[0117] S8, performing a second simulation using the disposal strategy, and outputting the disposal strategy when the impact of the public power grid is lower than the safety threshold and the cost is lower than the set cost threshold.

[0118] 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.

[0119] The above process includes dynamically adjusting the adopted disposal strategy and its structural parameters, and outputting the final disposal strategy when the manufacturing and use cost of the structure is lower than the set management budget and the effect of suppressing and eliminating harmonics meets the requirements (the impact on the public power grid obtained in the second simulation is lower than the safety threshold).

[0120] A power supply harmonic flicker detection and disposal method proposed in the present invention, in the process of searching for harmonic sources in the distribution network, recognizes the circuit structure data of the distribution network equipment by adopting a harmonic source analysis model and performs 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, thereby achieving the effect of improving detection accuracy and speed and reducing labor intensity. At the same time, 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 equipment in the distribution network, which can not only better suppress and eliminate harmonics but also reduce the management 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 scope of protection of the present disclosure. The attached 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 described.

[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 above 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 it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is encompassed in a manner similar to the term "including," as explained by "including" used as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "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; 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 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 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.

3. The method according to claim 2, 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.

4. 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.

5. The method according to claim 2, characterized in that 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; The verified intermediate harmonic source device is output as the final harmonic source device.

6. The method according to claim 5, characterized in that 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.

7. 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.

8. 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.

9. 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.

10. The method according to claim 9, 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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