Railway harmonic suppression visualization analysis and system based on HAPF

Abstract

The invention discloses a railway harmonic suppression visual analysis method and system based on an HAPF, and relates to the technical field of high-speed railway electric power, and the method comprises the steps: analyzing the harmonic of a high-speed railway traction power supply system; hAPF hybrid filtering is constructed by applying a PPF harmonic suppression method; a vehicle-network coupled traction power supply system simulation model is constructed in combination with actual data, and six working conditions are designed for harmonic characteristic and negative sequence analysis. According to the railway harmonic suppression visualization analysis method based on the HAPF, the HAPF hybrid filter is built to process the system harmonic problem, and the visualization scheme is adopted to carry out visualization time domain correlation analysis and regression analysis on harmonic waves at different speeds. A passive filter in the HAPF module adopts three single-tuned and second-order high-pass filters for combined filtering, harmonic current can be tracked and eliminated, and the harmonic problem of a high-speed rail traction power supply system can be processed more comprehensively. And a correlation analysis program is written by using Labview software, so that a reference basis is provided for high-speed rail design and harmonic suppression work in the future.

Description

Technical Field

[0001] The present invention relates to the field of high-speed railway electric power technology, and in particular to a railway harmonic suppression visualization analysis method and system based on HAPF. Background Art

[0002] In the traction power supply system of high-speed railways, with the continuous increase in train speed and the increasing volatility of electric traction loads, the power quality problems of the traction power supply system have become more and more complicated, especially the harmonic and reactive power problems are particularly prominent. In the daily operation of high-speed railways, the traction load frequently changes in the running state of the train, such as starting, acceleration, and braking, resulting in drastic fluctuations in reactive power within the power supply range, which in turn affects the overall stability and reliability of the power supply system. Although the prior art has introduced reactive power compensation devices such as compensation capacitors and magnetically controlled reactors, these devices can perform reactive power tracking compensation to a certain extent and reduce reactive power fluctuations caused by repeated switching of capacitors, but these technical means have obvious shortcomings in actual operation. First, the harmonic components of the traction power supply system are complex, especially under the high-power drive of the traction current, the harmonic content varies significantly with the type of train and the operating conditions, and the main function of the compensation capacitor and magnetically controlled reactor is reactive power compensation, which is difficult to effectively deal with harmonic components with a wide spectrum and uncertain frequency. Secondly, although traditional passive filters can eliminate harmonics of fixed frequencies to a certain extent, their harmonic filtering effect on specific frequencies is limited and cannot meet the needs of complex and changeable traction power supply systems. The filtering performance of passive filters is greatly affected by system parameters and environmental changes, making it difficult to adapt to the frequently changing harmonic characteristics of traction current. In addition, some passive filters may resonate with the power supply system, further deteriorating the power quality.

[0003] In addition, due to the complexity of the harmonic sources of the traction power supply system, the high-frequency components of the harmonic current are prone to form resonance points in the system, thereby causing high-order harmonic resonance overvoltage phenomena. This type of resonance phenomenon will not only affect the normal operation of the equipment, but also shorten the life of the system equipment and increase the failure rate, and even cause safety problems. At the same time, there are many different operating conditions in the traction power supply system, such as double-row traction, double-row braking, and mixed operation conditions. These conditions lead to uneven distribution of negative sequence components and harmonics in the system, further exacerbating the difficulty of harmonic control. Since existing passive filters and conventional compensation equipment are difficult to flexibly adapt to changes in different operating conditions, power quality problems are becoming increasingly apparent in high-speed railway systems. Therefore, in the high-speed railway traction power supply system, there is an urgent need for a dynamic harmonic control technology that can adapt to a variety of operating conditions to meet the system's high standards for power quality management. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problem solved by the present invention is that the existing traction power supply method has the problems of short life of system equipment, high failure rate, easy to cause safety problems, and difficulty in completely eliminating harmonics by passive filters alone.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a HAPF-based railway harmonic suppression visualization analysis and system, including analyzing the harmonics of the high-speed railway traction power supply system; using the PPF harmonic control method to construct a HAPF hybrid filter; combining actual data to construct a vehicle-grid coupled traction power supply system simulation model and designing six working conditions for harmonic characteristics and negative sequence analysis.

[0007] As a preferred solution of the railway harmonic suppression visualization analysis and system based on HAPF described in the present invention, when the harmonics of the high-speed railway traction power supply system are analyzed, including the harmonics of the harmonic current output by the EMU with resonance points, harmonic resonance will be induced to generate high-order harmonic resonance overvoltage.

[0008] As a preferred solution of the railway harmonic suppression visualization analysis and system based on HAPF described in the present invention, wherein: the use of the PPF harmonic control method to construct the HAPF hybrid filter includes a passive filter in the HAPF, and a combination method of three single-tuned and second-order high-pass filters is used for filtering;

[0009] The impedance of the HAPF is proportional to the signal frequency.

[0010] As a preferred solution of the railway harmonic suppression visualization analysis and system based on HAPF described in the present invention, wherein: the HAPF hybrid filter constructed by using the PPF harmonic control method includes an impedance Z h It is expressed as:

[0011] Z h =Z a +Z b

[0012]

[0013] Among them, Z1, Z2, and Z3 represent the complex impedances of the series branches in the HAPF hybrid filter, and Z a represents the overall partial complex impedance of the three series branches Z1, Z2, and Z3, Z b It represents the overall partial complex impedance of the parallel branch in the HAPF hybrid filter branch.

[0014] As a preferred solution of the railway harmonic suppression visualization analysis and system based on HAPF described in the present invention, wherein: the construction of a vehicle-grid coupled traction power supply system simulation model in combination with actual data and the design of six working conditions for harmonic characteristics and negative sequence analysis include combining the electrical parameters of the equipment in the domestic traction substation to construct simulation parameters;

[0015] Combining the locomotive model and traction power supply system, six types of locomotive operating conditions are designed to perform negative sequence and harmonic analysis on the grid side.

[0016] As a preferred solution of the railway harmonic suppression visualization analysis and system based on HAPF described in the present invention, wherein: the construction of a vehicle-grid coupled traction power supply system simulation model in combination with actual data and the design of six working conditions for harmonic characteristics and negative sequence analysis include analyzing the harmonic data at different speeds by controlling the locomotive running state simulation.

[0017] As a preferred solution of the railway harmonic suppression visualization analysis and system based on HAPF described in the present invention, the construction of a vehicle-grid coupled traction power supply system simulation model in combination with actual data and the design of six working conditions for harmonic characteristics and negative sequence analysis include using a correlation coefficient to describe the tightness, expressed as r, expressed as:

[0018]

[0019] Where r represents the simple correlation coefficient; n represents the sample size, Y represents the dependent variable, and X represents the independent variable;

[0020] When outputting the Spearman correlation coefficient, use Expressed as:

[0021]

[0022] Select the linear regression model and use the least squares method to estimate the parameters a and b. After estimation, the linear relationship between speed and harmonics is expressed as:

[0023]

[0024] in, represents the linear regression parameters of the actual application;

[0025] The sum of squared deviations between the regression model and the actual data points is:

[0026]

[0027] It is expressed as:

[0028]

[0029] in, is the linear regression parameter for practical application, N is the sample size, y i is the dependent variable, x i is the independent variable;

[0030] After the actual output, the model with the largest absolute value of the Pearson correlation coefficient of the transformed linear model is selected for regression modeling.

[0031] Another object of the present invention is to provide a HAPF-based railway harmonic suppression visualization analysis and system, which can construct a HAPF hybrid filter by using the PPF harmonic control method, solving the problem that the current traction power supply method contains a passive filter that is difficult to completely eliminate harmonics.

[0032] As a preferred solution of the railway harmonic suppression visualization analysis system based on HAPF described in the present invention, it includes: a harmonic analysis module, a HAPF hybrid filter construction module, and a traction power supply system simulation model construction module; the harmonic analysis module is used to analyze the harmonic problems of the high-speed railway traction power supply system; the HAPF hybrid filter construction module is used to construct a HAPF hybrid filter using the PPF harmonic control method; the traction power supply system simulation model construction module is used to establish a vehicle-grid coupled traction power supply system simulation model in combination with actual data, and design six working conditions.

[0033] A computer device includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement a step of a railway harmonic suppression visualization analysis method based on HAPF.

[0034] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a railway harmonic suppression visualization analysis and system based on HAPF.

[0035] Beneficial effects of the present invention: The present invention provides a HAPF-based railway harmonic suppression visualization analysis and system that handles system harmonic problems by building a HAPF hybrid filter, and uses a visualization scheme to perform visualized time domain correlation analysis and regression analysis on harmonics at different speeds. The passive filter in the HAPF module uses three single-tuned and second-order high-pass filter combinations to track and eliminate harmonic currents, and more comprehensively handle the harmonic problems of the high-speed rail traction power supply system. The correlation analysis program was written using Labview software, and it was found that the content of each harmonic current was linearly related to the speed of the EMU, and an expression was calculated, which provided a certain reference basis for future high-speed rail design and harmonic control work. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0037] Figure 1 The first embodiment of the present invention provides a HAPF-based railway harmonic suppression visualization analysis and overall flow chart of the system.

[0038] Figure 2 A schematic diagram of a HAPF module of a railway harmonic suppression visualization analysis and system based on HAPF is provided in the first embodiment of the present invention.

[0039] Figure 3 A schematic diagram of a harmonic current detection module of a railway harmonic suppression visualization analysis and system based on HAPF is provided for the second embodiment of the present invention, comprising a harmonic detection module and a HAPF hybrid filter module, which are used to suppress harmonics in the power grid and improve the power quality of the system.

[0040] Figure 4 A second embodiment of the present invention provides a visualization analysis of railway harmonic suppression based on HAPF and a current waveform diagram of the system.

[0041] Figure 5 A voltage waveform diagram of a railway harmonic suppression visualization analysis and system based on HAPF is provided in the second embodiment of the present invention. The diagram shows that after the filter is put into use, the voltage waveform is smoother and the harmonic content is lower.

[0042] Figure 6 A second embodiment of the present invention provides a visualization analysis of railway harmonic suppression based on HAPF and a current harmonic distribution diagram of the system under working condition 2 at 0.2s, and selects the stable current harmonic analysis at 0.2s.

[0043] Figure 7 A second embodiment of the present invention provides a visualization analysis of railway harmonic suppression based on HAPF and a voltage harmonic distribution diagram of the system under working condition 2 at 0.2s, and selects the stable voltage harmonic analysis at 0.2s.

[0044] Figure 8 A second embodiment of the present invention provides a visualization analysis of railway harmonic suppression based on HAPF and a current harmonic distribution diagram of the system under the second working condition at different times.

[0045] Fig. 9A second embodiment of the present invention provides a HAPF-based railway harmonic suppression visualization analysis and a voltage harmonic distribution diagram of the system under the second working condition at different times.

[0046] Fig.10 A second embodiment of the present invention provides a railway harmonic suppression visualization analysis based on HAPF and a harmonic distribution diagram of the system current under various working conditions at 0.2s. Figure 8 , Fig. 9 Analysis, select the stable harmonic waveform at 0.2s, combined with Fig.11 The analysis and horizontal comparison of the harmonic content of each operating condition show that under all operating conditions, the harmonic characteristics are consistent with the distribution of locomotive harmonics, that is, odd harmonics are dominant, and the harmonics around the 25th order are significantly larger. In addition, under the single-row braking condition, the high-frequency harmonic current is amplified.

[0047] Fig.11 A second embodiment of the present invention provides a visualization analysis of railway harmonic suppression based on HAPF and a harmonic distribution diagram of the system voltage under various working conditions at 0.2s.

[0048] Fig.12 A second embodiment of the present invention provides a visualization analysis of railway harmonic suppression based on HAPF and negative sequence characteristic waveform diagrams of six types of working conditions of the system.

[0049] Fig.13 A visualization analysis of railway harmonic suppression based on HAPF and a comparison diagram of filtering effects of current harmonics of the system provided in the second embodiment of the present invention reflect the comparison of filtering effects before filtering, after ordinary filtering, and after HAPF hybrid filtering.

[0050] Fig.14 The second embodiment of the present invention provides a HAPF-based railway harmonic suppression visualization analysis and system harmonic and speed correlation analysis program flowchart, the program flowchart shows the data input module, the correlation coefficient ρ and correlation coefficient r calculation module, and the waveform display module. The overall correlation analysis visualization interface is as follows Fig.15 shown.

[0051] Fig.15 A HAPF-based railway harmonic suppression visualization analysis and a system harmonic and speed correlation analysis interface diagram provided in the second embodiment of the present invention can intuitively derive the correlation between speed and current harmonic size.

[0052] Fig.16A HAPF-based railway harmonic suppression visualization analysis and a correlation coefficient bar chart between the current harmonics of the system and the EMU speed provided in the second embodiment of the present invention reflect that the contents of the 3rd, 7th, 13th, 15th, 21st and 29th current harmonics are highly correlated with the EMU running speed, so further regression analysis can be performed on them.

[0053] Fig.17 A second embodiment of the present invention provides a human-computer interaction interface for railway harmonic suppression visualization analysis and system regression analysis modeling based on HAPF, which performs regression analysis on highly correlated harmonics.

[0054] Fig.18 A third embodiment of the present invention provides a visualization analysis of railway harmonic suppression based on HAPF and an overall flow chart of the system, which can intuitively display a fitting curve between train speed and current harmonic size. DETAILED DESCRIPTION

[0055] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0056] Example 1, reference Figure 1-Figure 2 , which is an embodiment of the present invention, provides a railway harmonic suppression visualization analysis method based on HAPF, including:

[0057] S1: Analysis of harmonics in high-speed railway traction power supply system.

[0058] Furthermore, the harmonic problem of the high-speed railway traction power supply system is analyzed. When the harmonic current output by the EMU contains harmonics near the resonance point, it will induce harmonic resonance and generate high-order harmonic resonance overvoltage. The analysis is taken as an example of working condition 2, α traction-β braking.

[0059] S2: Use the PPF harmonic control method to construct a HAPF hybrid filter.

[0060] Furthermore, the PPF harmonic control method is used to construct a HAPF hybrid filter. The main feature of HAPF is that its impedance is proportional to the signal frequency and usually has a high Q value. It can track and eliminate the harmonic currents in the system and achieve power quality control for electrified railways.

[0061] It should be noted that the HAPF hybrid filter impedance Z h It can be expressed as follows,

[0062] Z h =Z a +Z b

[0063]

[0064] Where L is the inductance, C is the capacitance, w is the harmonic angular frequency, n here represents the harmonic number, Z1, Z2, and Z3 represent the impedance of the three single series branches in the HAPF hybrid filter, and Z a It represents the impedance of three single branches Z1, Z2 and Z3 connected in parallel. b Represents the parallel branch impedance in the HAPF hybrid filter branch.

[0065] The passive filter in the HAPF module uses a combination of three single-tuned and second-order high-pass filters for filtering. The parameter settings are shown in Table 1:

[0066] Table 1 Parameter setting table

[0067] Filter Type Capacitance C / μF Inductance L / mH Resistance value R / Ω 3rd order filter 246 4.6 0.01 5th order filter 135 3 0.01 7th order filter 95 2.17 0.01 High Pass Filter 34 4.66 120

[0068] S3: Based on actual data, a simulation model of the vehicle-grid coupled traction power supply system is constructed and six operating conditions are designed for harmonic characteristics and negative sequence analysis.

[0069] Furthermore, a simulation model of the vehicle-grid coupled traction power supply system is established in combination with actual data, and six working conditions are designed. Combined with the equipment electrical parameters of a domestic traction substation, the simulation parameter configuration is referenced to Table 2.

[0070] Table 2 Simulation parameter configuration table

[0071] System Parameters value Three-phase system voltage / kV 220 Traction substation capacity / MW 40 Transformer ratio of traction substation 220:27.5 AT capacity MW 40 Simulation time / s 0.3

[0072] Combined with the locomotive model and traction power supply system, six types of locomotive operating conditions are designed to carry out negative sequence and harmonic analysis on the grid side. The description of the six types of operating conditions is shown in Table 3.

[0073] Table 3 Description of six types of working conditions

[0074] Working condition category Working conditions description Condition 1 Double-row traction, both power supply arms are traction operation Condition 2 α traction-β braking, traction on the left, braking on the right Condition 3 Double-row brake, both power supply arms are brake operation Condition 4 α braking-β traction, braking on the left, traction on the right Condition 5 Single row brake, only one side is braked, the other side is free Condition 6 Single-row traction, only one side is traction, and the other side has no car Condition 7 No train crossing

[0075] It should be noted that, under multiple operating conditions, adaptive experiments were conducted on HAPF parameters; multi-operating condition harmonic characteristics and negative sequence analysis were conducted on the traction power supply system; under the same operating condition, HAPF hybrid filtering was used to conduct harmonic characteristics and negative sequence analysis at different train speeds; visual time domain correlation analysis and regression analysis were conducted on harmonics at different speeds;

[0076] Furthermore, under the same working condition, the HAPF hybrid filter performs harmonic characteristics and negative sequence analysis at different train speeds. The HAPF parameters are adaptively experimented under multiple working conditions. The working condition is simulated by controlling the running state of the locomotive. Taking working condition 2 as an example: traction on the left and braking on the right, the harmonic data at different speeds are analyzed.

[0077] As shown in Table 4, the harmonic data describing the train at different speeds are taken from the stable harmonic at 0.2s, and the harmonic content of each working condition is compared horizontally.

[0078] Table 4 Stable harmonics table

[0079] Train speed / (km / h) THDi / % THDv / % 200 1.98 0.12 210 3.37 0.29 220 2.19 1.77 230 2.29 0.14 240 3.59 0.22 250 3.22 0.27 260 4.14 0.39 270 3.88 0.44 280 3.56 0.46 290 3.27 3.17 300 3.16 3.09 310 2.98 2.93 320 2.43 2.56 330 2.23 2.60 340 2.43 2.71

[0080] The simple correlation coefficient is used to describe the closeness, expressed as r, and its calculation formula is:

[0081]

[0082] In the above formula, r is the simple correlation coefficient; n is the sample size; Y is the dependent variable; X is the independent variable; when calculating the Spearman correlation coefficient, ρ is used to express its calculation formula as follows:

[0083]

[0084] Select the linear regression model and use the least squares method to estimate the parameters a and b. After estimation, the linear relationship between speed and harmonics can be expressed as:

[0085]

[0086] The sum of squared deviations between the regression model and the actual data points is:

[0087]

[0088] Solve it by the following formula

[0089]

[0090] is the linear regression parameter for practical application, N is the sample size, y i is the dependent variable; x i is the independent variable; after actual calculation, the model with the larger absolute value of the Pearson correlation coefficient of the transformed linear model is selected for regression modeling.

[0091] Example 2, reference Figure 3-Figure 17, which is an embodiment of the present invention, provides a railway harmonic suppression visualization analysis method based on HAPF. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0092] First, refer to Figure 2 , respectively build a HAPF hybrid filter and an ordinary C-type filter (here the C-type filter has been further optimized on the basis of the ordinary single-tuned filter). A schematic diagram of a harmonic current detection module for railway reactive power compensation and harmonic suppression method based on HAPF is shown in Figure 3 As shown; secondly, referring to Table 2, combined with the electrical parameters of a traction substation, the system parameters are set, and referring to Table 1 to set the parameters of the HAPF hybrid filter; thirdly, taking the working condition 2 in Table 3, α traction-β braking as an example, the HAPF hybrid filter system, the ordinary C-type filter system and the filter-free system are respectively operated and the current harmonic data are collected; finally, the results refer to Fig.13 It can be seen that the use of ordinary C-type filters can only suppress current harmonics to a small extent, and the filtering effect on high-order harmonics is even weaker. The filtering effect of HAPF hybrid filtering is obviously better than that of ordinary C-type filters.

[0093] Example 3, reference Fig.18 , which is an embodiment of the present invention, provides a railway harmonic suppression visualization analysis and system based on HAPF, including a harmonic analysis module, a HAPF hybrid filter construction module, and a traction power supply system simulation model construction module.

[0094] The harmonic analysis module is used to analyze the harmonic problems of the high-speed railway traction power supply system, the HAPF hybrid filter construction module is used to construct the HAPF hybrid filter using the PPF harmonic control method, and the traction power supply system simulation model construction module is used to establish a vehicle-grid coupled traction power supply system simulation model based on actual data, and design six working conditions.

[0095] If the function 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 this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0096] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0097] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0098] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc. It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limited. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

[0099] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A railway harmonic suppression visualization analysis and system based on HAPF, characterized in that: include: Analyze the harmonics of high-speed railway traction power supply system; Use PPF harmonic control method to build HAPF hybrid filter; Based on actual data, a simulation model of the vehicle-grid coupled traction power supply system is constructed, and six operating conditions are designed for harmonic characteristics and negative sequence analysis.

2. The railway harmonic suppression visualization analysis and system based on HAPF as claimed in claim 1, characterized in that: The analysis of the harmonics of the high-speed railway traction power supply system includes harmonics of the harmonic current output by the EMU, which will induce harmonic resonance and generate high-order harmonic resonance overvoltage.

3. The railway harmonic suppression visualization analysis and system based on HAPF as claimed in claim 2, characterized in that: The HAPF hybrid filter constructed by using the PPF harmonic control method includes a passive filter in the HAPF, and a combination method of three single-tuned and second-order high-pass filters is used for filtering; The impedance of the HAPF is proportional to the signal frequency.

4. The railway harmonic suppression visualization analysis and system based on HAPF as claimed in claim 3, characterized in that: The use of the PPF harmonic control method to construct a HAPF hybrid filter includes an impedance Z h It is expressed as: WITH h =Z a +Z b Among them, Z1, Z2, and Z3 represent the complex impedances of the series branches in the HAPF hybrid filter, and Z a represents the overall partial complex impedance of the three series branches Z1, Z2, and Z3, Z b It represents the overall partial complex impedance of the parallel branch in the HAPF hybrid filter branch.

5. The railway harmonic suppression visualization analysis and system based on HAPF as claimed in claim 4, characterized in that: The construction of a vehicle-grid coupled traction power supply system simulation model in combination with actual data and the design of six operating conditions for harmonic characteristics and negative sequence analysis include combining the electrical parameters of equipment in domestic traction substations to construct simulation parameters; Combining the locomotive model and traction power supply system, six types of locomotive operating conditions are designed to perform negative sequence and harmonic analysis on the grid side.

6. The railway harmonic suppression visualization analysis and system based on HAPF as claimed in claim 5, characterized in that: The method of building a vehicle-grid coupled traction power supply system simulation model in combination with actual data and designing six operating conditions for harmonic characteristics and negative sequence analysis includes analyzing harmonic data at different speeds by controlling the locomotive running state simulation.

7. The railway harmonic suppression visualization analysis and system based on HAPF as claimed in claim 6, characterized in that: The vehicle-grid coupled traction power supply system simulation model is constructed in combination with actual data and six working conditions are designed for harmonic characteristics and negative sequence analysis, including using the correlation coefficient to describe the tightness, expressed as r, which is expressed as: Among them, r represents the simple correlation coefficient, n represents the sample size, Y represents the dependent variable, and X represents the independent variable; When outputting the Spearman correlation coefficient, use Expressed as: Select the linear regression model and use the least squares method to estimate the parameters a and b. After estimation, the linear relationship between speed and harmonics is expressed as: in, represents the linear regression parameters of the actual application; The sum of squared deviations between the regression model and the actual data points is: It is expressed as: in, is the linear regression parameter for practical application, N is the sample size, y i is the dependent variable, x i is the independent variable; After the actual output, the model with the largest absolute value of the Pearson correlation coefficient of the transformed linear model is selected for regression modeling.

8. A railway harmonic suppression visualization analysis and system based on HAPF according to any one of claims 1 to 7, characterized in that: Including harmonic analysis module, HAPF hybrid filter building module, traction power supply system simulation model building module; The harmonic analysis module is used to analyze the harmonic problem of the high-speed railway traction power supply system; The HAPF hybrid filter construction module is used to construct a HAPF hybrid filter using a PPF harmonic control method; The traction power supply system simulation model building module is used to establish a vehicle-grid coupled traction power supply system simulation model in combination with actual data, and to design six operating conditions.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of a railway harmonic suppression visualization analysis and system based on HAPF as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of a railway harmonic suppression visualization analysis and system based on HAPF as described in any one of claims 1 to 7 are implemented.

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