Frequency converter control power supply fault judgment system and method based on frequency converter simulation

Abstract

The invention discloses a frequency converter control power supply fault judgment system and method based on frequency converter simulation, and relates to the field of power supply fault judgment. Establishing a frequency converter control power supply fault characteristic parameter at a starting moment and a mapping equation between a voltage data change equation and a frequency converter control power supply fault characteristic parameter at an ending moment in each working stage process of the frequency converter; control power supply fault types at the starting moment and the ending moment of each working stage of the current to-be-judged frequency converter are subjected to mapping judgment, so that measures can be taken in time to repair the faults; the multiple constant coefficients of the to-be-adjusted control power supply etching fault characteristic parameter mapping equation are subjected to multiple times of iterative adjustment, the mapping accuracy of the to-be-adjusted control power supply etching fault characteristic parameter mapping equation is higher and higher along with iteration, and finally the requirements are met.

Description

Technical Field

[0001] The present invention belongs to the field of power failure judgment, and more particularly, to a system and method for judging the failure of a frequency converter control power supply based on frequency converter simulation. Background Art

[0002] With the upgrading of underground equipment, frequency converters have been widely popularized and applied. These devices play an increasingly important role in underground production. However, the maintenance and repair of new frequency converter equipment pose a severe challenge to electrical technicians. Since frequency converters integrate multiple integrated circuits and require multiple different control power supplies to supply power to these integrated circuits, and currently it is strictly prohibited to repair electrical equipment with power on underground mines, it is difficult to identify the problem with the naked eye. Troubleshooting one by one is not only time-consuming but also requires a large amount of manpower, and the production delay time is relatively long. Summary of the Invention

[0003] In view of the problems in the related art, the present invention provides a system and method for judging the failure of a frequency converter control power supply based on frequency converter simulation to overcome the above technical problems existing in the prior related art.

[0004] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0005] The present invention provides a method for judging the failure of a frequency converter control power supply based on frequency converter simulation, including the following steps:

[0006] S1. Set a historical data set of frequency converter control power supply failure types and a historical matrix of frequency converter control power supply failure characteristic parameters;

[0007] S2. Use the historical data set of frequency converter control power supply failure types and the historical matrix of frequency converter control power supply failure characteristic parameters to construct a final mapping equation for frequency converter control power supply failure types;

[0008] S3. Collect the change equations of various types of control power supply failure characteristic parameters and the voltage data of the control power supply at the start and end times of several historical frequency converters in each working stage to construct a final mapping equation matrix of control power supply failure characteristic parameters at the end time;

[0009] S4. Input the control power supply failure characteristic parameters of the current frequency converter to be judged at the start time of each working stage and the change equations of the corresponding control power supply voltage data into the final mapping equation of frequency converter control power supply failure types to map the control power supply failure characteristic parameters at the end time, and then input the control power supply failure characteristic parameters at the start and end times of each working stage into the final mapping equation of frequency converter control power supply failure types to obtain the corresponding control power supply failure type data;

[0010] By establishing mapping equations between multiple collectible fault characteristic parameters of the frequency converter control power supply and the corresponding data of the fault types of the frequency converter control power supply, and then establishing mapping equations between the fault characteristic parameters of the frequency converter control power supply at the start time and the change equation of the voltage data during each working stage of the frequency converter and the fault characteristic parameters of the frequency converter control power supply at the end time, the fault types of the control power supply at the start time and the end time of each working stage of the currently to-be-determined frequency converter are mapped and determined, so as to facilitate taking measures in time to repair the fault.

[0011] Preferably, the S1 includes the following steps:

[0012] S11. Set several fault types of the frequency converter control power supply to obtain a set of fault types of the frequency converter control power supply; then set several types of characteristic parameters that have an impact on the several fault types of the frequency converter control power supply to obtain a set of fault characteristic parameters of the frequency converter control power supply;

[0013] S12. Cooperate with the set of fault types of the frequency converter control power supply and the set of fault characteristic parameters of the frequency converter control power supply to collect several groups of data of the fault types of the frequency converter control power supply and the fault characteristic parameters of the frequency converter control power supply corresponding to the occurrence of faults in the frequency converter in history, so as to obtain a historical data set of the fault types of the frequency converter control power supply and a historical matrix of the fault characteristic parameters of the frequency converter control power supply;

[0014] By setting the set of fault types of the frequency converter control power supply and the set of fault characteristic parameters of the frequency converter control power supply, the common fault types of the frequency converter control power supply are integrated. When determining the power fault type of the to-be-determined frequency converter subsequently, the determined fault type will be included in the set of fault types of the frequency converter control power supply; at the same time, it provides a basis for collecting the corresponding fault type data and the corresponding fault characteristic parameters subsequently.

[0015] Preferably, the S2 includes the following steps:

[0016] S21. Construct an initial mapping equation for the fault types of the frequency converter control power supply in cooperation with the set of fault types of the frequency converter control power supply and the set of fault characteristic parameters of the frequency converter control power supply;

[0017] S22. Substitute each row of data in the historical matrix of the fault characteristic parameters of the frequency converter control power supply into the initial mapping equation for the fault types of the frequency converter control power supply for mapping to obtain an initial mapping data set of the fault types of the historical frequency converter control power supply;

[0018] S23. Set the mapping error threshold for the fault type of the frequency converter control power supply; calculate the error data between the initial mapping data set of the historical frequency converter control power supply fault type and the historical frequency converter control power supply fault type data set to obtain the historical power supply fault type mapping error data;

[0019] When the historical power supply fault type mapping error data is greater than or equal to the mapping error threshold of the frequency converter control power supply fault type, adjust the initial mapping equation of the frequency converter control power supply fault type until the historical power supply fault type mapping error data is less than the mapping error threshold of the frequency converter control power supply fault type, and obtain the final mapping equation of the frequency converter control power supply fault type; otherwise, there is no need to adjust the initial mapping equation of the frequency converter control power supply fault type;

[0020] Based on the least squares principle, by assigning constant coefficients and constant exponential coefficients to the fault characteristic parameters of each type of frequency converter control power supply, a mapping relationship between the fault characteristic parameters of each type of frequency converter control power supply and the fault type data of the frequency converter control power supply is established; then substitute the historical data to test the mapping accuracy of the initial mapping equation of the frequency converter control power supply fault type; when the mapping accuracy rate does not meet the requirements, adjust the constant coefficients and constant exponential coefficients of the fault characteristic parameters of each type of frequency converter control power supply to ensure that the adjusted mapping equation of the frequency converter control power supply fault type meets the requirements, thereby improving the accuracy of mapping the power supply fault type of the frequency converter to be judged by the subsequent final mapping equation of the frequency converter control power supply fault type.

[0021] Preferably, in S23, the squirrel optimization algorithm is used to adjust the initial mapping equation of the frequency converter control power supply fault type.

[0022] Preferably, the S3 includes the following steps:

[0023] S31. Divide the working cycle of the frequency converter into stages to obtain the frequency converter working stage set; cooperate with the frequency converter working stage set and the frequency converter control power supply fault characteristic parameter type set, and collect various types of control power supply fault characteristic parameters and the change equation of the control power supply voltage within the corresponding working stage at the start time and end time of each working stage of several historical frequency converters to obtain the historical stage frequency converter control power supply fault characteristic parameter matrix set and the historical stage control power supply voltage change equation matrix;

[0024] S32. Construct a mapping equation between various types of control power supply fault characteristic parameters at the end and start times of each frequency converter working stage based on the historical stage frequency converter control power supply fault characteristic parameter matrix set and the historical stage control power supply voltage change equation matrix, and obtain the final control power supply end time fault characteristic parameter mapping equation matrix;

[0025] As the working duration of the frequency converter continuously increases, problems such as the aging of some components may occur, which may in turn cause changes in the change characteristics of various types of control power supply fault characteristic parameters corresponding to it. For example, as the working duration of the frequency converter increases, the dielectric ability of the dielectric layer inside the capacitor decreases, resulting in a decrease in the actual withstand voltage ability of the capacitor; after the thermal stress reaches a certain threshold, it will cause interlayer discharge of the insulating layer inside the capacitor, forming bad points, resulting in a decrease in the capacitance value, and the decrease in the capacitance value of the capacitor will compress the blanking time; resistor: the resistance value may change or overheat and burn out during long-term operation; based on the above, this solution takes into account the working duration of the frequency converter by constructing a mapping equation between various types of control power supply fault characteristic parameters at the end and start times of each frequency converter working stage, making the mapping of various types of control power supply fault characteristic parameters at the end time of the current stage more accurate subsequently, and thus improving the accuracy of predicting the occurrence of faults in the control power supply of the frequency converter.

[0026] Preferably, S32 includes the following steps:

[0027] S321. Construct an initial control power supply end time fault characteristic parameter mapping equation matrix in cooperation with the historical stage frequency converter control power supply fault characteristic parameter matrix set and the historical stage control power supply voltage change equation matrix;

[0028] S322. Substitute the various types of control power supply fault characteristic parameters at the start time of each corresponding working stage in the historical stage frequency converter control power supply fault characteristic parameter matrix set and the change equation of the control power supply voltage data in the corresponding stage of the historical stage control power supply voltage change equation matrix into the corresponding initial control power supply end time fault characteristic parameter mapping equation in the initial control power supply end time fault characteristic parameter mapping equation matrix for mapping, and obtain the historical stage end time control power supply fault characteristic initial mapping parameter matrix set;

[0029] S323. Set the control power supply fault characteristic parameter mapping error threshold; calculate the error data between the historical stage end time control power supply fault characteristic initial mapping parameter matrix set and several control power supply fault characteristic parameters of the same type in the same stage in the historical stage frequency converter control power supply fault characteristic parameter matrix set, and obtain the historical control power supply fault characteristic parameter mapping error data matrix;

[0030] When there is error data greater than or equal to the control power supply fault characteristic parameter mapping error threshold in the historical control power supply fault characteristic parameter mapping error data matrix, the initial control power supply knot fault characteristic parameter mapping equation corresponding to the error data is denoted as the control power supply knot fault characteristic parameter mapping equation to be adjusted; adjust the constant coefficient of the control power supply knot fault characteristic parameter mapping equation to be adjusted until there is no error data greater than or equal to the control power supply fault characteristic parameter mapping error threshold in the historical control power supply fault characteristic parameter mapping error data matrix, and obtain the final control power supply knot fault characteristic parameter mapping equation matrix; otherwise, use the initial control power supply knot fault characteristic parameter mapping equation matrix as the final control power supply knot fault characteristic parameter mapping equation matrix;

[0031] By taking the control power supply fault characteristic parameters at the start time of the working stage and the change equation of the control power supply voltage data of the frequency converter as independent variables, and taking the control power supply fault characteristic parameters at the end time of the working stage as the dependent variable, a mapping relationship from the control power supply fault characteristic parameters at the start time of the working stage to the control power supply fault characteristic parameters at the end time is constructed; then input the collected historical data into the constructed initial mapping equation to detect its mapping accuracy rate, so as to adjust the constant coefficient of the initial mapping equation to improve the mapping accuracy, and further ensure the accuracy of the subsequent process of obtaining the control power supply fault characteristic parameters at the end time based on the control power supply fault characteristic parameters at the start time of each current stage.

[0032] Preferably, the adjustment of the constant coefficient of the control power supply knot fault characteristic parameter mapping equation to be adjusted in S323 includes the following steps:

[0033] S3231. Set the value range of several constant coefficients of the control power supply knot fault characteristic parameter mapping equation to be adjusted, and obtain the set of value ranges of the adjusted knot fault parameter mapping constant coefficients;

[0034] Construct a squirrel population for adjusting the control power supply knot fault characteristic parameter mapping; set the maximum number of iterations of the squirrel population for adjusting the control power supply knot fault characteristic parameter mapping as b3' and the current number of iterations as b4', which are respectively denoted as the maximum number of iterations for the control power supply knot and the current number of iterations for the control power supply knot;

[0035] S3232. Generate the initial position of each squirrel in the squirrel population for adjusting the control power supply knot fault characteristic parameter mapping according to the set of value ranges of the adjusted knot fault parameter mapping constant coefficients, and obtain the second initial position matrix;

[0036] S3233. Construct the fitness function of the squirrel population for adjusting the control power supply knot fault characteristic parameter mapping;

[0037] S3234. Start the iteration. Before the iteration, set the current iteration count of the power control node to 1. During the first-round iteration, use the power control node fault feature parameter mapping to adjust the fitness function of the squirrel population to calculate the fitness values of the initial positions of each squirrel in the second initial position matrix, obtaining a third fitness value set. Take the maximum fitness value in the third fitness value set and the corresponding initial position of the squirrel as the third global best fitness and the third global best position respectively. Update the initial positions of each squirrel in the second initial position matrix according to the third global best fitness and the third global best position. After the update is completed, increment the current iteration count of the power control node by 1 and enter the next round of iteration.

[0038] During each subsequent round of iteration, use the power control node fault feature parameter mapping to adjust the fitness function of the squirrel population to calculate the fitness values of the positions of each squirrel in the squirrel population with the power control node fault feature parameter mapping adjusted during the previous round of iteration, obtaining a fourth fitness value set. Take the maximum fitness value in the fourth fitness value set and the corresponding position of the squirrel as the fourth global best fitness and the fourth global best position respectively. Update the positions of each squirrel in the squirrel population with the power control node fault feature parameter mapping adjusted during the previous round of iteration according to the fourth global best fitness and the fourth global best position. After the update is completed, increment the current iteration count of the power control node by 1 and enter the next round of iteration.

[0039] S3235. When b4′≥b3′, stop the iteration, obtaining the second final global best fitness and the second final global best position; otherwise, continue the iteration until b4′≥b3′. Take the second final global best fitness as the historical optimized power control fault feature parameter mapping error data. When the historical optimized power control fault feature parameter mapping error data is less than the power control fault feature parameter mapping error threshold, substitute each position component of the second final global best position into the power control node fault feature parameter mapping equation to be adjusted, and the adjustment is completed; otherwise, return to S3234 to continue the iteration until the historical optimized power control fault feature parameter mapping error data is less than the power control fault feature parameter mapping error threshold.

[0040] In this solution, the squirrel optimization algorithm is used to iteratively adjust multiple constant coefficients of the power control node fault feature parameter mapping equation to be adjusted, and the mapping accuracy rate of the power control node fault feature parameter mapping equation to be adjusted is used as the fitness function. Therefore, as the iteration progresses, the mapping accuracy rate of the power control node fault feature parameter mapping equation to be adjusted becomes higher and higher, and finally meets the requirements.

[0041] Preferably, S4 includes the following steps:

[0042] S41. Set the currently to-be-determined frequency converter; in coordination with the working stage set of the frequency converter, record the current working stage during the use of the currently to-be-determined frequency converter as the currently ongoing working stage; in coordination with the frequency converter control power supply fault characteristic parameter type set, collect various types of frequency converter control power supply fault characteristic parameters at the start moment of the currently ongoing working stage to obtain the frequency converter control power supply fault characteristic parameter set at the current start moment;

[0043] Input the frequency converter control power supply fault characteristic parameter set at the current start moment into the final frequency converter control power supply fault type mapping equation for mapping to obtain the frequency converter control power supply fault type data at the current start moment;

[0044] When the frequency converter control power supply fault type data at the current start moment is a non-fault type, proceed to S42; otherwise, perform fault repair on the currently to-be-determined frequency converter according to the frequency converter control power supply fault type data at the current start moment;

[0045] S42. Collect the voltage data of the control power supply of the currently to-be-determined frequency converter at several time points before the start of the currently ongoing working stage to obtain the current historical control power supply voltage data set; predict the control power supply voltage data at several time points within the currently ongoing working stage based on the current historical control power supply voltage data set and perform change equation fitting to obtain the control power supply voltage change equation for the currently ongoing working stage;

[0046] S42. In coordination with the final control power supply end moment fault characteristic parameter mapping equation matrix, input the control power supply voltage change equation for the currently ongoing working stage and each parameter in the frequency converter control power supply fault characteristic parameter set at the current start moment into the corresponding final control power supply end moment fault characteristic parameter mapping equation for mapping to obtain the frequency converter control power supply fault characteristic parameter set at the current end moment;

[0047] Input the frequency converter control power supply fault characteristic parameter set at the current end moment into the final frequency converter control power supply fault type mapping equation for mapping to obtain the frequency converter control power supply fault type data at the current end moment; when the frequency converter control power supply fault type data at the current start moment is a non-fault type, proceed to S43; otherwise, perform fault repair on the currently to-be-determined frequency converter according to the frequency converter control power supply fault type data at the current end moment;

[0048] S43. Take the next working stage in the working stage set of the frequency converter that is after the currently ongoing working stage as the currently ongoing working stage, and then take the frequency converter control power supply fault characteristic parameter set at the current end moment as various types of frequency converter control power supply fault characteristic parameters at the start moment of the currently ongoing working stage, and repeat S41, S42, and S43;

[0049] When the current working stage is the last working stage in the concentration of the frequency converter working stages, stop repeating;

[0050] By cycling through each working stage of the currently to-be-determined frequency converter, individual mapping is performed on various types of frequency converter control power supply fault characteristic parameters at the start and end times of each stage, ensuring the accuracy of the mapping, and thus ensuring the accuracy of obtaining the control power supply fault type data at the start and end times of each stage.

[0051] Preferably, in S42, a BP neural network model is used to predict the control power supply voltage data at several time points within the current working stage;

[0052] The BP neural network model, through the backpropagation algorithm, automatically adjusts the weights of each connection in the network according to the error between the input sample and the expected output, so as to realize the learning and approximation of the input-output relationship, can adapt to different problems and data sets, and has strong generalization ability; based on the above advantages, in this solution, a BP neural network model is used to predict the control power supply voltage data at several time points in the current working stage, ensuring the accuracy of the predicted data, and thus ensuring the accuracy of subsequent judgment of the corresponding control power supply fault type data.

[0053] A frequency converter control power supply fault judgment system based on frequency converter simulation includes a historical frequency converter control power supply fault data acquisition module, a frequency converter control power supply fault type mapping equation construction module, a control power supply end moment fault characteristic parameter mapping equation construction module, and a current frequency converter control power supply fault type dynamic judgment module.

[0054] The present invention has the following beneficial effects:

[0055] 1. In the present invention, by establishing mapping equations between multiple collectable frequency converter control power supply fault characteristic parameters and the corresponding frequency converter control power supply fault type data, and then establishing mapping equations between the frequency converter control power supply fault characteristic parameters and voltage data change equations at the start time and the frequency converter control power supply fault characteristic parameters at the end time during each working stage of the frequency converter, mapping judgment is performed on the control power supply fault types at the start and end times of each working stage of the currently to-be-determined frequency converter, so as to facilitate taking measures in a timely manner to repair the fault.

[0056] 2. In the present invention, the squirrel optimization algorithm is used to perform multiple iterative adjustments on multiple independent variable coefficients, independent variable exponent coefficients, and bias constants of the initial frequency converter control power supply fault type mapping equation. As the iteration progresses, the mapping accuracy of the initial frequency converter control power supply fault type mapping equation is higher, and finally the mapping requirements are met.

[0057] 3. In the present invention, by constructing a mapping equation between various types of control power supply fault characteristic parameters at the end and start times of each operating stage of the frequency converter, the operating duration of the frequency converter is considered, making the mapping of various types of control power supply fault characteristic parameters at the end of the current stage more accurate subsequently, thereby improving the accuracy of predicting the occurrence of faults in the control power supply of the frequency converter.

[0058] 4. In the present invention, by using the squirrel optimization algorithm to perform multiple iterative adjustments on multiple constant coefficients of the mapping equation of the fault characteristic parameters of the control power supply to be adjusted, as the iteration progresses, the mapping accuracy rate of the mapping equation of the fault characteristic parameters of the control power supply to be adjusted becomes higher and higher, and finally meets the requirements.

[0059] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions of the embodiments of the invention, the following will briefly introduce the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0061] Figure 1 It is a schematic flow chart of the method for judging faults in the control power supply of a frequency converter based on frequency converter simulation of the present invention;

[0062] Figure 2 It is a schematic flow chart of constructing the mapping equation of the final fault type of the control power supply of the frequency converter of the present invention;

[0063] Figure 3 It is a schematic flow chart of constructing the mapping equation matrix of the final fault characteristic parameters of the control power supply at the end moment of the present invention;

[0064] Figure 4 It is a schematic module diagram of the system for judging faults in the control power supply of a frequency converter based on frequency converter simulation of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0065] The following will clearly and completely describe the technical solutions in the embodiments of the invention with reference to the drawings in the embodiments of the invention. Obviously, the described embodiments are only a part of the embodiments of the invention, rather than all of them. Based on the embodiments in the invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the invention.

[0066] Embodiment 1

[0067] Please refer toFigures 1-3 , this embodiment is a method for judging the failure of the control power supply of a frequency converter based on simulation of the frequency converter, including the following steps:

[0068] S1. Set the historical data set of frequency converter control power supply failure types and the historical characteristic parameter matrix of frequency converter control power supply failures;

[0069] The S1 includes the following steps:

[0070] S11. Set several types of frequency converter control power supply failure types to obtain a set of frequency converter control power supply failure types; the set of frequency converter control power supply failure types includes overvoltage failure types, undervoltage failure types, phase sequence error failure types, IGBT open or short circuit failure types, freewheeling diode failure types, PWM signal abnormal failure types, optocoupler isolation failure types, and non-failure types, etc. Each failure type in the set of frequency converter control power supply failure types is represented by a natural number, such as 1: overvoltage failure type, 2: undervoltage failure type, etc.; then set several types of characteristic parameter types that have an impact on the frequency converter control power supply failure types to obtain a set of frequency converter control power supply failure characteristic parameter types;

[0071] The set of frequency converter control power supply failure characteristic parameter types includes current harmonic distortion rate (THD value), voltage d-q axis component unbalance degree, transient response time, capacitance ESR change rate, and switch tube conduction voltage drop, etc.;

[0072] Among them, the current harmonic distortion rate (THD value): The current harmonic distortion rate (THD value) refers to the percentage of the root mean square value of each harmonic current to the effective value of the fundamental current. It can be obtained by measuring the current waveform with an oscilloscope, analyzing the content of each harmonic through Fourier transform, and then calculating the THD value; voltage d-q axis component unbalance degree: In a three-phase system, the voltage is decomposed into d-q axis components, and the unbalance degree can be represented by calculating the amplitude difference or phase difference of the d-q axis components. It can be directly measured by using a power quality analyzer to measure the d-q axis components of the three-phase voltage and calculate the unbalance degree; transient response time: The transient response time refers to the time required for the output signal to reach a stable state after the system receives a suddenly changing input signal. It can be determined by using a signal generator to generate a step signal as the input of the system and an oscilloscope to measure the output signal of the system; capacitance ESR change rate: The change rate of the equivalent series resistance (ESR) of the capacitor refers to the degree of change of the ESR of the capacitor under different conditions. It can be measured by using an LCR meter to measure the ESR value of the capacitor, and by measuring the ESR of the capacitor under different conditions (such as temperature, frequency, etc.), calculate the ESR change rate; switch tube conduction voltage drop: The switch tube conduction voltage drop refers to the voltage drop across the switch tube when it is in the conduction state. It can be directly measured by using a multimeter to measure the voltage drop when the switch tube is conducting;

[0073] S12. In coordination with the frequency converter control power failure type set and the frequency converter control power failure characteristic parameter type set, collect several groups of historical frequency converter control power failure type data and frequency converter control power failure characteristic parameters corresponding to the occurrence of failures in the frequency converter, and obtain the historical frequency converter control power failure type data set and the historical frequency converter control power failure characteristic parameter matrix a2; a 1i represents the i-th group of historical frequency converter control power failure type data collected corresponding to the occurrence of failures in the frequency converter, and a′1 represents the total number of groups of data collected when the frequency converter has historical failures; a2 is as follows

[0074]

[0075] wherein, a 2ij represents the j-th type of frequency converter control power failure characteristic parameter corresponding to the i-th group of historical frequency converter failures in a2, and a′2 represents the total number of types of frequency converter control power failure characteristic parameters set

[0076] S2. Construct the final frequency converter control power failure type mapping equation by using the historical frequency converter control power failure type data set and the historical frequency converter control power failure characteristic parameter matrix

[0077] The S2 includes the following steps

[0078] S21. Construct the initial frequency converter control power failure type mapping equation in coordination with the frequency converter control power failure type set and the frequency converter control power failure characteristic parameter type set; as follows

[0079]

[0080] In the formula is the dependent variable of the initial frequency converter control power failure type mapping equation, representing the frequency converter control power failure type data is the j-th independent variable of the initial frequency converter control power failure type mapping equation, representing the j-th type of frequency converter control power failure characteristic parameter are respectively the corresponding independent variable coefficient and independent variable exponential coefficient; α represents the bias constant of the initial frequency converter control power failure type mapping equation; ceil represents the rounding function

[0081] S22. Substitute each row of data in the historical frequency converter control power failure characteristic parameter matrix into the initial frequency converter control power failure type mapping equation for mapping, and obtain the historical frequency converter control power failure type initial mapping data set a 3iIt represents the data of the fault type of the converter control power supply corresponding to the i-th group of historical converter faults obtained by the initial mapping;

[0082] S23. Set the mapping error threshold of the converter control power supply fault type; calculate the error data between the initial mapping data set of the historical converter control power supply fault type and the historical converter control power supply fault type data set to obtain the historical power supply fault type mapping error data The calculation formula is as follows,

[0083]

[0084] When the historical power supply fault type mapping error data is greater than or equal to the mapping error threshold of the converter control power supply fault type, adjust the initial mapping equation of the converter control power supply fault type until the historical power supply fault type mapping error data is less than the mapping error threshold of the converter control power supply fault type, and then obtain the final mapping equation of the converter control power supply fault type; otherwise, there is no need to adjust the initial mapping equation of the converter control power supply fault type;

[0085] The adjustment of the initial mapping equation of the converter control power supply fault type in S23 includes the following steps:

[0086] S231. Set the value ranges of the coefficients of each independent variable, the coefficients of the exponents of the independent variables, and the bias constants in the initial mapping equation of the converter control power supply fault type to obtain the set b1 of the value ranges of the coefficients of the independent variables of the power supply fault type mapping, the set b2 of the value ranges of the coefficients of the exponents of the independent variables of the power supply fault type mapping, and the value range of the bias constant of the power supply fault type mapping

[0087] They respectively represent the lower limit and the upper limit of the value of the bias constant in the initial mapping equation of the converter control power supply fault type; b1 and b2 are as follows respectively,

[0088]

[0089] Among them, They respectively represent the lower limit and the upper limit of the value of the i-th coefficient of the independent variable in the initial mapping equation of the converter control power supply fault type; They respectively represent the lower limit and the upper limit of the value of the i-th coefficient of the exponent of the independent variable in the initial mapping equation of the converter control power supply fault type;

[0090] Construct a squirrel population adjusted by mapping the fault types of the inverter control power supply; set the maximum number of iterations of the squirrel population adjusted by mapping the fault types of the inverter control power supply as b1' and the current number of iterations as b2', which are respectively denoted as the maximum number of iterations of fault mapping and the current number of iterations of fault mapping; the number of search space dimensions of the squirrel population adjusted by mapping the fault types of the inverter control power supply is (2·a'2 + 1);

[0091] S232. Generate an initial position matrix for each squirrel in the squirrel population adjusted by mapping the fault types of the inverter control power supply according to the set of independent variable coefficient value ranges, the set of independent variable exponent coefficient value ranges, and the bias constant value range for the fault type mapping of the power supply, to obtain the first set of initial position matrices represents the initial position matrix of the j-th squirrel in the generated squirrel population adjusted by mapping the fault types of the inverter control power supply, represents the size of the squirrel population adjusted by mapping the fault types of the inverter control power supply; as follows,

[0092]

[0093] where, respectively represent the position components of the j-th squirrel in the squirrel population adjusted by mapping the fault types of the inverter control power supply on the i-th independent variable coefficient, the i-th independent variable exponent coefficient, and the bias constant dimension in the initial inverter control power supply fault type mapping equation; the generation formulas are as follows respectively,

[0094]

[0095] In the formula, respectively represent for randomly generated random numbers between 0 and 1;

[0096] S233. Construct the fitness function of the squirrel population adjusted by mapping the fault types of the inverter control power supply as follows,

[0097]

[0098] In the formula, c1 represents the error data between the mapping data set obtained by substituting a set of independent variable coefficients, independent variable exponent coefficients, and bias constants obtained in each iteration into the initial inverter control power supply fault type mapping equation and then substituting each row of data in the historical inverter control power supply fault characteristic parameter matrix in S22 into the initial inverter control power supply fault type mapping equation for mapping, and the historical inverter control power supply fault type data set; β1 is a positive number, representing the first protection parameter;

[0099] S234. Start iteration. Before iteration, set the current iteration number of the fault mapping to 1. During the first round of iteration, use the inverter control power fault type mapping to adjust the fitness function of the squirrel population. Calculate the fitness values of the initial position matrices of each squirrel in the first initial position matrix set to obtain the first fitness value set. Take the maximum fitness value in the first fitness value set and the corresponding initial position matrix of the squirrel as the first global best fitness and the first global best position respectively. Update the initial position matrices of each squirrel in the first initial position matrix set according to the first global best fitness and the first global best position. After the update is completed, increment the current iteration number of the fault mapping by 1 and enter the next round of iteration.

[0100] During each subsequent round of iteration, use the inverter control power fault type mapping to adjust the fitness function of the squirrel population. Calculate the fitness values of the position matrices of each squirrel in the squirrel population adjusted by the inverter control power fault type mapping updated during the previous round of iteration to obtain the second fitness value set. Take the maximum fitness value in the second fitness value set and the corresponding position matrix of the squirrel as the second global best fitness and the second global best position respectively. Update the position matrices of each squirrel in the squirrel population adjusted by the inverter control power fault type mapping updated during the previous round of iteration according to the second global best fitness and the second global best position. After the update is completed, increment the current iteration number of the fault mapping by 1 and enter the next round of iteration.

[0101] S235. When b2′ ≥ b1′, stop iteration to obtain the first final global best fitness and the first final global best position. Otherwise, continue iteration until b2′ ≥ b1′. Take the first final global best fitness as the historical optimized power fault type mapping error data. When the historical optimized power fault type mapping error data is less than the inverter control power fault type mapping error threshold, substitute each position component of the first final global best position into the initial inverter control power fault type mapping equation to obtain the final inverter control power fault type mapping equation. Otherwise, return to S234 to continue iteration until the historical optimized power fault type mapping error data is less than the inverter control power fault type mapping error threshold.

[0102] The squirrel optimization algorithm can perform global search in the search space by simulating the foraging behavior of squirrels. In the algorithm, squirrels move between different trees to find the best food source, and this behavior enables the algorithm to explore the entire search space, thus having a greater chance of finding the global optimal solution. By adaptively adjusting the search strategy, it can quickly converge to the optimal solution during the search process. Squirrels will dynamically adjust their search paths and speeds according to the current search situation, thereby accelerating the convergence speed. It is not sensitive to the selection of initial values and parameters and has strong robustness. In the algorithm, the initial positions and search strategies of squirrels are randomly generated, and this randomness enables the algorithm to find the optimal solution under different initial conditions. Based on the above advantages, in this solution, the squirrel optimization algorithm is used to iteratively adjust the coefficients of multiple independent variables, the coefficients of independent variable exponents, and the bias constants of the initial inverter control power supply fault type mapping equation multiple times, and the mapping accuracy of the initial inverter control power supply fault type mapping equation is used as the fitness function. Therefore, as the iteration progresses, the mapping accuracy of the initial inverter control power supply fault type mapping equation is higher, and finally the mapping requirements are met.

[0103] S3. Collect the characteristic parameters of various types of control power supply faults and the change equations of the voltage data of the control power supply at the start and end times of each working stage of several historical inverters to construct the final control power supply end fault characteristic parameter mapping equation matrix.

[0104] The said S3 includes the following steps:

[0105] S31. Divide the working cycle of the inverter into stages to obtain the inverter working stage set. In cooperation with the inverter working stage set and the set of types of control power supply fault characteristic parameters of the inverter, collect the characteristic parameters of various types of control power supply faults at the start and end times of each corresponding working stage of several historical inverters and the change equations of the voltage data of the control power supply within the corresponding working stages to obtain the historical stage inverter control power supply fault characteristic parameter matrix set and the historical stage control power supply voltage change equation matrix represents the characteristic parameter matrix of various types of control power supply faults at the start and end times of each corresponding working stage of the i-th historical inverter collected, and c′ represents the total number of inverters corresponding to the collected historical inverter data. Respectively as follows,

[0106]

[0107] Among them, respectively represent the k-th type of control power supply fault characteristic parameter at the start time and the end time of the j-th working stage of the i-th historical frequency converter collected; a3' represents the total number of working stages obtained by dividing the working cycle of the frequency converter into stages; represents the change equation of the control power supply voltage data of the i-th historical frequency converter at the j-th working stage corresponding thereto;

[0108] S32. Construct a mapping equation between various types of control power supply fault characteristic parameters at the end time and the start time of each frequency converter working stage according to the historical stage frequency converter control power supply fault characteristic parameter matrix set and the historical stage control power supply voltage change equation matrix, and obtain the final control power supply end time fault characteristic parameter mapping equation matrix;

[0109] The S32 includes the following steps:

[0110] S321. Construct an initial control power supply end time fault characteristic parameter mapping equation matrix in cooperation with the historical stage frequency converter control power supply fault characteristic parameter matrix set and the historical stage control power supply voltage change equation matrix as follows,

[0111]

[0112] wherein, represents the initial mapping equation between the k-th type of control power supply fault characteristic parameter at the end time and the start time of the j-th working stage of the frequency converter; as follows,

[0113]

[0114] wherein, is the dependent variable, representing the control power supply fault characteristic parameter at the end time of the j-th working stage of the frequency converter; is the mapping relationship, used to combine each independent variable and constant coefficient of, such as addition, multiplication, etc.; are all independent variables of, respectively representing the control power supply fault characteristic parameter at the start time of the j-th working stage of the frequency converter and the change equation of the control power supply voltage data of the j-th working stage of the frequency converter;

[0115] S322. Substitute the characteristic parameters of various types of control power supply faults at the start time of each working stage corresponding to the historical stage inverter control power supply fault characteristic parameter matrix set and the change equations of the control power supply voltage data in the corresponding stage of the historical stage control power supply voltage change equation matrix into the corresponding initial control power supply end time fault characteristic parameter mapping equations in the initial control power supply end time fault characteristic parameter mapping equation matrix for mapping to obtain the historical stage end time control power supply fault characteristic initial mapping parameter matrix set represents the matrix of characteristic parameters of various types of control power supply faults at the end time of each working stage corresponding to the i-th historical frequency converter after mapping; as follows

[0116]

[0117] where represents the mapping data of the k-th type of control power supply fault characteristic parameter at the end time of the j-th working stage in

[0118] S323. Set the control power supply fault characteristic parameter mapping error threshold; calculate the error data between the historical stage end time control power supply fault characteristic initial mapping parameter matrix set and several control power supply fault characteristic parameters of the same type in the same stage in the historical stage inverter control power supply fault characteristic parameter matrix set to obtain the historical control power supply fault characteristic parameter mapping error data matrix d; as follows

[0119]

[0120] where d jk represents the error data between the historical stage end time control power supply fault characteristic initial mapping parameter matrix set and several control power supply fault characteristic parameters of the k-th type at the end time of the j-th working stage in the historical stage inverter control power supply fault characteristic parameter matrix set; the calculation formula is as follows

[0121]

[0122] When there is error data greater than or equal to the control power supply fault characteristic parameter mapping error threshold in the historical control power supply fault characteristic parameter mapping error data matrix, the initial control power supply junction fault characteristic parameter mapping equation corresponding to the error data is recorded as the control power supply junction fault characteristic parameter mapping equation to be adjusted; adjust the constant coefficients of the control power supply junction fault characteristic parameter mapping equation to be adjusted until there is no error data greater than or equal to the control power supply fault characteristic parameter mapping error threshold in the historical control power supply fault characteristic parameter mapping error data matrix, and obtain the final control power supply junction fault characteristic parameter mapping equation matrix; otherwise, use the initial control power supply junction fault characteristic parameter mapping equation matrix as the final control power supply junction fault characteristic parameter mapping equation matrix;

[0123] The adjustment of the constant coefficients of the control power supply junction fault characteristic parameter mapping equation to be adjusted in S323 includes the following steps:

[0124] S3231. Set the value range of several constant coefficients of the control power supply junction fault characteristic parameter mapping equation to be adjusted to obtain the set b4 of value ranges of the adjusted junction fault parameter mapping constant coefficients; as follows,

[0125]

[0126] Among them, respectively represent the lower limit and the upper limit of the value of the i-th constant coefficient of the control power supply junction fault characteristic parameter mapping equation to be adjusted, and d' represents the total number of constant coefficients of the control power supply junction fault characteristic parameter mapping equation to be adjusted;

[0127] Construct a squirrel population for adjusting the control power supply junction fault characteristic parameter mapping; set the maximum number of iterations of the squirrel population for adjusting the control power supply junction fault characteristic parameter mapping to be b3' and the current number of iterations to be b4', which are respectively recorded as the maximum number of iterations of the control power supply junction and the current number of iterations of the control power supply junction; the number of search space dimensions of the squirrel population for adjusting the control power supply junction fault characteristic parameter mapping is the same as d';

[0128] S3232. Generate the initial position of each squirrel in the squirrel population for adjusting the control power supply junction fault characteristic parameter mapping according to the set b4 of value ranges of the adjusted junction fault parameter mapping constant coefficients, and obtain the second initial position matrix as follows,

[0129]

[0130] Among them, Denote the position component of the initial position of the j-th squirrel in the squirrel population adjusted by the control power junction fault characteristic parameter mapping on the i-th constant coefficient dimension of the control power junction fault characteristic parameter mapping equation to be adjusted. Denote the scale of the squirrel population adjusted by the control power junction fault characteristic parameter mapping. The generation formula of

[0131]

[0132] In the formula, rand 2ji Denote a random number between 0 and 1 generated for

[0133] S3233. Construct the fitness function of the squirrel population adjusted by the control power junction fault characteristic parameter mapping as follows

[0134]

[0135] In the formula, c2 denotes the error between the mapped data and the actual data obtained by substituting a set of constant coefficients obtained in each iteration into the control power junction fault characteristic parameter mapping equation to be adjusted, and then substituting the corresponding control power fault characteristic parameter in the historical stage converter control power fault characteristic parameter matrix set in S322 and the change equation of the control power voltage data in the corresponding stage of the historical stage control power voltage change equation matrix into the control power junction fault characteristic parameter mapping equation to be adjusted for mapping; β2 is a positive number, denoting the second protection parameter.

[0136] S3234. Start the iteration. Before the iteration, set the current iteration number of the control power junction to 1; in the first round of iteration, use the fitness function of the squirrel population adjusted by the control power junction fault characteristic parameter mapping to calculate the fitness value of the initial position of each squirrel in the second initial position matrix, and obtain the third fitness value set; take the maximum fitness value in the third fitness value set and the corresponding initial position of the squirrel as the third global best fitness and the third global best position respectively; update the initial position of each squirrel in the second initial position matrix according to the third global best fitness and the third global best position; after the update is completed, increment the current iteration number of the control power junction by 1 and enter the next round of iteration.

[0137] In each subsequent round of iteration, use the fitness function of the squirrel population adjusted by the control power junction fault characteristic parameter mapping Calculate the fitness value of adjusting the position of each squirrel in the squirrel population with the fault characteristic parameter mapping of the control power supply junction updated in the previous iteration process to obtain the fourth fitness value set; take the maximum fitness value in the fourth fitness value set and the position of the corresponding squirrel as the fourth global best fitness and the fourth global best position respectively; update the position of each squirrel in the squirrel population with the fault characteristic parameter mapping of the control power supply junction updated in the previous iteration process according to the fourth global best fitness and the fourth global best position; after the update is completed, add 1 to the current iteration number of the power control junction and enter the next iteration;

[0138] S3235. When b4′≥b3′, stop the iteration to obtain the second final global best fitness and the second final global best position; otherwise, continue the iteration until b4′≥b3′; take the second final global best fitness as the historical optimized control power supply fault characteristic parameter mapping error data; when the historical optimized control power supply fault characteristic parameter mapping error data is less than the control power supply fault characteristic parameter mapping error threshold, substitute each position component of the second final global best position into the equation of the fault characteristic parameter mapping of the control power supply junction to be adjusted, and the adjustment is completed; otherwise, return to S3234 to continue the iteration until the historical optimized control power supply fault characteristic parameter mapping error data is less than the control power supply fault characteristic parameter mapping error threshold;

[0139] S4. Map the fault characteristic parameters of the inverter control power supply at the start time of each working stage of the current inverter to be determined and the change equation of the voltage data of the corresponding control power supply into the final inverter control power supply fault type mapping equation to map the fault characteristic parameters of the inverter control power supply at the end time, and then input the fault characteristic parameters of the inverter control power supply at the start time and the end time of each working stage into the final inverter control power supply fault type mapping equation to obtain the corresponding control power supply fault type data;

[0140] S4 includes the following steps:

[0141] S41. Set the current inverter to be determined; cooperate with the inverter working stage set, and record the current working stage in the use process of the current inverter to be determined as the current working stage in progress; cooperate with the inverter control power supply fault characteristic parameter type set to collect various types of fault characteristic parameters of the inverter control power supply at the start time of the current working stage in progress to obtain the current start-time inverter control power supply fault characteristic parameter set;

[0142] Input the current start-time inverter control power supply fault characteristic parameter set into the final inverter control power supply fault type mapping equation for mapping to obtain the current start-time inverter control power supply fault type data;

[0143] When the current engraving frequency converter control power supply fault type data is a non-fault type, proceed to S42; otherwise, perform fault repair on the current converter to be determined according to the current engraving frequency converter control power supply fault type data;

[0144] S42. Collect the voltage data of the control power supply of the current converter to be determined at several time points before the start of the current working stage to obtain the current historical control power supply voltage data set; predict the control power supply voltage data at several time points within the current working stage according to the current historical control power supply voltage data set and perform change equation fitting to obtain the control power supply voltage change equation for the current working stage;

[0145] S42. In cooperation with the final control power supply engraving fault characteristic parameter mapping equation matrix, input each parameter in the control power supply voltage change equation for the current working stage and the current engraving frequency converter control power supply fault characteristic parameter set into the corresponding final control power supply engraving fault characteristic parameter mapping equation for mapping to obtain the current engraving frequency converter control power supply fault characteristic parameter set;

[0146] In S42, a BP neural network model is used to predict the control power supply voltage data at several time points within the current working stage;

[0147] Input the current engraving frequency converter control power supply fault characteristic parameter set into the final converter control power supply fault type mapping equation for mapping to obtain the current engraving frequency converter control power supply fault type data; when the current engraving frequency converter control power supply fault type data is a non-fault type, proceed to S43; otherwise, perform fault repair on the current converter to be determined according to the current engraving frequency converter control power supply fault type data;

[0148] S43. Take the next working stage in the converter working stage set that is located after the current working stage as the current working stage, and then take the current engraving frequency converter control power supply fault characteristic parameter set as the various types of converter control power supply fault characteristic parameters at the start moment of the current working stage, and repeat S41, S42, and S43;

[0149] When the current working stage is the last working stage in the converter working stage set, stop repeating.

[0150] Embodiment 2

[0151] Please refer to Figure 4, this embodiment discloses a judgment system for the failure of the control power supply of a frequency converter based on frequency converter simulation. The system can implement the method of the above embodiment, including a historical failure data acquisition module for the control power supply of the frequency converter, a mapping equation construction module for the failure types of the control power supply of the frequency converter, a mapping equation construction module for the characteristic parameters of the failure at the control power connection point, and a dynamic judgment module for the current failure types of the control power supply of the frequency converter;

[0152] The historical failure data acquisition module for the control power supply of the frequency converter acquires several groups of data on the failure types of the control power supply of the frequency converter and the characteristic parameters of the failure of the control power supply of the frequency converter corresponding to the historical failures of the frequency converter, and obtains a historical data set of the failure types of the control power supply of the frequency converter and a matrix of the characteristic parameters of the failure of the control power supply of the frequency converter;

[0153] The mapping equation construction module for the failure types of the control power supply of the frequency converter constructs a final mapping equation for the failure types of the control power supply of the frequency converter by using the historical data set of the failure types of the control power supply of the frequency converter and the matrix of the characteristic parameters of the failure of the control power supply of the frequency converter;

[0154] The mapping equation construction module for the characteristic parameters of the failure at the control power connection point acquires various types of characteristic parameters of the control power supply failure at the start and end times of each working stage of several historical frequency converters and the change equation of the voltage data of the control power supply within the corresponding working stage to construct a final matrix of the mapping equations for the characteristic parameters of the failure at the control power connection point;

[0155] The dynamic judgment module for the current failure types of the control power supply of the frequency converter maps the characteristic parameters of the failure of the control power supply of the frequency converter at the start time of each working stage of the currently to-be-determined frequency converter and the change equation of the corresponding control power supply voltage data into the final mapping equation for the failure types of the control power supply of the frequency converter to map the characteristic parameters of the failure of the control power supply of the frequency converter at the end time, and then inputs the characteristic parameters of the failure of the control power supply of the frequency converter at the start and end times of each working stage into the final mapping equation for the failure types of the control power supply of the frequency converter to obtain the corresponding data on the failure types of the control power supply.

[0156] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0157] The preferred embodiments of the invention disclosed above are only used to help illustrate the invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the invention, so that those skilled in the art can well understand and utilize the invention.

Claims

1. A method for judging the failure of the control power supply of a frequency converter based on frequency converter simulation, characterized in that Including the following steps: S1. Set the historical frequency converter control power supply fault type data set and the historical frequency converter control power supply fault characteristic parameter matrix; S2. Use the historical frequency converter control power supply fault type data set and the historical frequency converter control power supply fault characteristic parameter matrix to construct the final frequency converter control power supply fault type mapping equation; S3. Collect the change equations of the control power supply fault characteristic parameters and the voltage data of the control power supply at the start and end times of the working stage of the historical frequency converter to construct the final control power supply end-time fault characteristic parameter mapping equation matrix; S4. Map the control power supply fault characteristic parameters of the current frequency converter to be judged at the start time of the working stage and the change equation of the voltage data of the control power supply into the final frequency converter control power supply fault type mapping equation to map the control power supply fault characteristic parameters at the end time, and then input the control power supply fault characteristic parameters at the start time and the end time into the final frequency converter control power supply fault type mapping equation to obtain the control power supply fault type data.

2. The method for judging the fault of the inverter control power supply based on inverter simulation according to claim 1, characterized in that, The S1 includes the following steps: S11. Set several types of frequency converter control power supply fault types to obtain the frequency converter control power supply fault type set; then set several types of characteristic parameter types that have an impact on the several types of frequency converter control power supply fault types to obtain the frequency converter control power supply fault characteristic parameter type set; S12. Cooperate with the frequency converter control power supply fault type set and the frequency converter control power supply fault characteristic parameter type set to collect several groups of historical frequency converter control power supply fault type data and frequency converter control power supply fault characteristic parameters corresponding to the occurrence of faults in the frequency converter to obtain the historical frequency converter control power supply fault type data set and the historical frequency converter control power supply fault characteristic parameter matrix.

3. The method for judging the failure of the inverter control power supply based on inverter simulation according to claim 2, wherein The S2 includes the following steps: S21. Cooperate with the frequency converter control power supply fault type set and the frequency converter control power supply fault characteristic parameter type set to construct the initial frequency converter control power supply fault type mapping equation; S22. Substitute each row of data in the historical frequency converter control power supply fault characteristic parameter matrix into the initial frequency converter control power supply fault type mapping equation for mapping to obtain the initial mapping data set of the historical frequency converter control power supply fault type; S23. Set the frequency converter control power supply fault type mapping error threshold; adjust the initial frequency converter control power supply fault type mapping equation according to the frequency converter control power supply fault type mapping error threshold and the initial mapping data set of the historical frequency converter control power supply fault type.

4. The method for judging the failure of the control power supply of the frequency converter based on the simulation of the frequency converter according to claim 3, wherein: In S23, the squirrel optimization algorithm is used to adjust the initial frequency converter control power supply fault type mapping equation.

5. The method for judging the failure of the control power supply of a frequency converter based on frequency converter simulation according to claim 4, characterized in that, The S3 includes the following steps: S31. Divide the working cycle of the frequency converter into stages to obtain the set of working stages of the frequency converter; in combination with the set of working stages of the frequency converter and the set of types of control power supply fault characteristic parameters of the frequency converter, collect various types of control power supply fault characteristic parameters at the start and end times of each corresponding working stage of a number of historical frequency converters, as well as the change equation of the voltage data of the control power supply within the corresponding working stage, to obtain the set of historical stage frequency converter control power supply fault characteristic parameter matrices and the historical stage control power supply voltage change equation matrix; S32. Construct a mapping equation between various types of control power supply fault characteristic parameters at the end time and the start time of each working stage of the frequency converter based on the set of historical stage frequency converter control power supply fault characteristic parameter matrices and the historical stage control power supply voltage change equation matrix, to obtain the final control power supply end time fault characteristic parameter mapping equation matrix.

6. The method for judging the failure of the inverter control power supply based on inverter simulation according to claim 5, wherein, The S32 includes the following steps: S321. Construct an initial control power supply end time fault characteristic parameter mapping equation matrix in combination with the set of historical stage frequency converter control power supply fault characteristic parameter matrices and the historical stage control power supply voltage change equation matrix; S322. Substitute the various types of control power supply fault characteristic parameters at the start time of each corresponding working stage in the set of historical stage frequency converter control power supply fault characteristic parameter matrices and the change equation of the control power supply voltage data in the corresponding stage in the historical stage control power supply voltage change equation matrix into the corresponding initial control power supply end time fault characteristic parameter mapping equation in the initial control power supply end time fault characteristic parameter mapping equation matrix for mapping, to obtain the set of historical stage end time control power supply fault characteristic initial mapping parameter matrices; S323. Set the control power supply fault characteristic parameter mapping error threshold; calculate the error data between a number of control power supply fault characteristic parameters of the same type in the same stage in the set of historical stage end time control power supply fault characteristic initial mapping parameter matrices and the set of historical stage frequency converter control power supply fault characteristic parameter matrices, to obtain the historical control power supply fault characteristic parameter mapping error data matrix; When there is error data greater than or equal to the control power supply fault characteristic parameter mapping error threshold in the historical control power supply fault characteristic parameter mapping error data matrix, record the initial control power supply end time fault characteristic parameter mapping equation corresponding to the error data as the control power supply end time fault characteristic parameter mapping equation to be adjusted; adjust the constant coefficient of the control power supply end time fault characteristic parameter mapping equation to be adjusted; otherwise, no adjustment is required.

7. The method for judging the failure of the inverter control power supply based on the simulation of the inverter according to claim 6, characterized in that: In S323, the squirrel optimization algorithm is used to adjust the constant coefficient of the control power supply end time fault characteristic parameter mapping equation to be adjusted.

8. The method for judging the fault of the inverter control power supply based on inverter simulation according to claim 7, characterized in that The S4 includes the following steps: S41. Set the current inverter to be judged; in coordination with the working stage set of the inverter, record the current working stage during the use of the current inverter to be judged as the current working stage in progress; in coordination with the inverter control power supply fault characteristic parameter type set, collect various types of inverter control power supply fault characteristic parameters at the start time of the current working stage in progress, and obtain the current start-time inverter control power supply fault characteristic parameter set; Input the current start-time inverter control power supply fault characteristic parameter set into the final inverter control power supply fault type mapping equation for mapping to obtain the current start-time inverter control power supply fault type data; When the current start-time inverter control power supply fault type data is a non-fault type, proceed to S42; otherwise, perform fault repair on the current inverter to be judged according to the current start-time inverter control power supply fault type data; S42. Collect the voltage data of the control power supply of the current inverter to be judged at several time points before the start of the current working stage in progress to obtain the current historical control power supply voltage data set; predict the control power supply voltage data at several time points during the current working stage in progress based on the current historical control power supply voltage data set and perform change equation fitting to obtain the current working stage control power supply voltage change equation; S42. In coordination with the final control power supply end-time fault characteristic parameter mapping equation matrix, input the current working stage control power supply voltage change equation and each parameter in the current start-time inverter control power supply fault characteristic parameter set into the corresponding final control power supply end-time fault characteristic parameter mapping equation for mapping to obtain the current end-time inverter control power supply fault characteristic parameter set; Input the current end-time inverter control power supply fault characteristic parameter set into the final inverter control power supply fault type mapping equation for mapping to obtain the current end-time inverter control power supply fault type data; when the current start-time inverter control power supply fault type data is a non-fault type, proceed to S43; otherwise, perform fault repair on the current inverter to be judged according to the current end-time inverter control power supply fault type data; S43. Take the next working stage in the inverter working stage set that is located after the current working stage in progress as the current working stage in progress, and then take the current end-time inverter control power supply fault characteristic parameter set as various types of inverter control power supply fault characteristic parameters at the start time of the current working stage in progress, and repeat S41, S42, and S43; When the current working stage in progress is the last working stage in the inverter working stage set, stop repeating.

9. The method for judging the fault of the inverter control power supply based on the simulation of the inverter according to claim 8, wherein: In S42, a BP neural network model is used to predict the control power supply voltage data at several time points during the current working stage in progress.

10. A system for implementing the inverter control power supply fault judgment method based on inverter simulation as described in any one of claims 1-9.

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