Control method and system of frequency converter system and storage medium

Abstract

The invention discloses a control method and system of a frequency converter system and a storage medium, and relates to the technical field of frequency converter control, in the step S1, environment parameter data information, harmonic data information and interface signal data information are obtained in real time, and the real-time performance and accuracy of data are ensured; in the step S2 and the step S3, an environment interference index Zgr, an electromagnetic interference degree index Zdc and an interface signal quality inspection index Zxj are obtained through feature extraction, analysis and calculation, a control period deviation index Zkq is obtained through fitting, the control period deviation index Zkq is compared and analyzed with a preset deviation threshold value P, a corresponding deviation level is obtained, and early warning display and debugging are carried out; according to the method, three key factors including environmental interference, electromagnetic interference and interface signal quality are introduced and quantified, the influence of the three key factors on the control period is evaluated, the control period deviation of the system is more accurately diagnosed and adjusted, the accurate control and reliability of the frequency converter in a complex environment are remarkably improved, and the actual application requirement is better met.

Description

Technical Field

[0001] The present invention relates to the technical field of inverter control, and in particular to a control method, system and storage medium of an inverter system. Background Art

[0002] As an important power electronic device, the inverter is widely used in industrial automation, energy management, intelligent manufacturing and other fields. Its main function is to achieve precise control of motor speed and torque by adjusting the frequency and voltage of the motor. With the rapid development of industrial automation, the complexity and precision requirements of the inverter control system in practical applications in HVAC systems, new energy electric vehicles and robotics are constantly increasing. The inverter control system needs to collect and process various input signals in real time to ensure that the system can quickly respond to load changes and external interference. In this process, the accuracy of the control cycle becomes one of the key factors affecting the performance of the control system. The control cycle deviation, that is, the difference between the actual control cycle and the set control cycle, will directly affect the response speed, stability and efficiency of the inverter. Therefore, studying and solving the inverter control cycle deviation problem is of great significance to improving the overall performance of the inverter system.

[0003] The current inverter control cycle deviation problems are mainly manifested in slow response speed, poor system stability and insufficient control accuracy. The root causes of these problems are the influence of environmental interference, electromagnetic interference and interface signal quality factors. Traditional inverter control systems often lack effective diagnosis and adjustment mechanisms, making it difficult to identify and respond to control cycle deviation problems in a timely manner, making it difficult for system performance to meet actual application requirements. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a control method, system and storage medium for a frequency converter system, which solve the problems in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A control method for a frequency converter system, comprising:

[0006] S1. According to the environment in which the frequency converter is located during operation, environmental parameter data information is obtained in real time, and harmonic data information and interface signal data information in each acquisition time period of the frequency converter during operation are obtained through multiple sensors deployed inside the frequency converter, and the environmental parameter data information, harmonic data information and interface signal data information are transmitted to the database;

[0007] S2, respectively pre-processing the harmonic data information, interface signal data information and environmental parameter data information, identifying and eliminating errors and abnormal values, and storing the data after normalization and standardization; at the same time, analyzing the environmental parameter data information to generate an environmental interference index Zgr, and comparing and analyzing it with a preset interference threshold G to determine whether to issue a preliminary warning instruction and execute it;

[0008] S3, extracting features from the harmonic data information and the interface signal data information in the database of step S2 respectively, and obtaining the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj in turn through analysis and calculation, and obtaining the control cycle deviation index Zkq through fitting after machine learning calculation and dimensionless processing of the environmental interference index Zgr, the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj;

[0009] S4. According to the control cycle deviation index Zkq obtained in step S3, compare and analyze it with the preset deviation threshold P to obtain the corresponding deviation level, and make corresponding early warning display and debugging according to the deviation level.

[0010] Preferably, according to the environment in which the frequency converter is located during operation, environmental parameter data information is acquired in real time, wherein the environmental parameter data information includes dust coverage thickness Fgh, mechanical vibration Dzj, humidity Sju and temperature Thj, and transmitted to the database;

[0011] Through the current sensor and voltage sensor deployed inside the inverter, the harmonic data information of the inverter in each collection time period during operation is obtained, where the harmonic data information includes the high-frequency value Qgf of the switching element, the output harmonic distortion value Qsx and the load harmonic value Qfx, and is transmitted to the database;

[0012] The high-wave value Qgf of the switching element represents the high-frequency current value Igf and the high-wave voltage frequency Vgf generated by the switching element during the operation of the inverter; the high-wave current frequency Igf and the high-wave voltage frequency Vgf are directly collected by the current sensor and the voltage sensor to generate the high-wave value Qgf of the switching element. The high-wave value Qgf of the switching element is calculated and obtained by the following formula:

[0013]

[0014] The output harmonic distortion value Qsx is a measure of the size of the harmonic component in the inverter output signal relative to the fundamental component. It is an important indicator for evaluating the quality of the output signal, which is mainly manifested in the degradation of power quality and electromagnetic interference, so as to affect the performance and stability of the inverter system and reduce the control accuracy. Specifically, the output harmonic distortion value Qsx includes the output current harmonic distortion value and the output voltage harmonic distortion value. The output harmonic current frequency Isx and the output harmonic voltage frequency Vsx are directly collected by the current sensor and the voltage sensor to generate the output harmonic distortion value Qsx. The output harmonic distortion value Qsx is calculated and obtained by the following formula:

[0015]

[0016] In the formula, Ij represents the output fundamental current frequency, Vj represents the output fundamental voltage frequency, Expressed as output current distortion value, Expressed as output voltage distortion value;

[0017] The load harmonic value Qfx is the harmonic generated by the load motor during its own rotation and stop process when receiving the output of the inverter, which will generate electromagnetic interference and affect the normal operation of the control circuit and power electronic devices inside the inverter; the load harmonic current frequency Ifx and the load harmonic voltage frequency Vfx are directly collected by the current sensor and the voltage sensor to generate the load harmonic value Qfx, and the load harmonic value Qfx is calculated and obtained by the following formula;

[0018]

[0019] By deploying current sensors and voltage sensors inside the inverter, the interface signal data information of the inverter in each acquisition time period during operation is obtained, where the interface signal data information includes voltage noise Hdy, current noise Hdl, voltage transient value Sdy and current transient value Sdl, and is transmitted to the database.

[0020] Preferably, the environmental parameter data information after data preprocessing is analyzed to generate an environmental interference index Zgr calculated by the following formula:

[0021]

[0022] In the formula, Fgh is the dust coverage thickness, Fgh Max It represents the preset maximum allowable value of dust coverage thickness, Dzj represents mechanical vibration, Sju represents humidity, Sju Max It represents the maximum allowable value preset for humidity, Thj represents temperature, Thj Maxrepresents the preset maximum allowable value of the temperature, wherein k1, k2, k3 and k4 represent the preset proportional coefficients of the dust cover thickness Fgh, the mechanical vibration Dzj, the humidity Sju and the temperature Thj, respectively, and A represents the first correction constant;

[0023] A comparison analysis is performed based on the environmental interference index Zgr and the preset interference threshold G to determine whether to issue a preliminary warning instruction. The specific contents are as follows:

[0024] If the environmental interference index Zgr≤interference threshold G, it is determined that the current environment of the inverter is in a qualified state, and no additional warning instruction is issued at this time;

[0025] If the environmental interference index Zgr>interference threshold G, it is determined that the current environment of the inverter is in an unqualified state. At this time, a preliminary warning instruction is issued. The content of the preliminary warning instruction includes transmitting the environmental parameter data information to the debugging control module for visualization processing, so that maintenance personnel can view and perform maintenance according to the specific displayed information.

[0026] Preferably, the harmonic data information in the database is analyzed according to step S3, and after dimensionless processing, an electromagnetic interference degree index Zdc is obtained, and the electromagnetic interference degree index Zdc is obtained by the following formula:

[0027]

[0028] In the formula, Qgf i Expressed as the high-voltage wave value of the switching element in the ith monitoring period, Qsx i Expressed as the output harmonic distortion value in the ith monitoring period, Qfx i It is represented by the load harmonic value in the i-th monitoring period, i=1, 2, 3, ..., n, n represents the detection period, α1, α2 and α3 are all represented by preset proportional coefficients, and α1+α2+α3=1.0, and B represents the second correction constant.

[0029] Preferably, the interface signal quality inspection index Zxj is obtained by analyzing the interface signal data information and performing dimensionless processing. The interface signal quality inspection index Zxj is obtained by the following formula:

[0030]

[0031] Where Hdy i It is expressed as the voltage noise in the ith monitoring period, Hdl i It is represented as the current noise in the i-th monitoring period, Sdy i It is expressed as the voltage transient value in the i-th monitoring period, Sdl iIt is represented as the current transient value in the i-th monitoring period, i=1, 2, 3, ..., n, n represents the detection period, a1 and a2 both represent preset proportional coefficients, and a1+a2=1.0, and C represents the third correction constant.

[0032] Preferably, the environmental interference index Zgr, the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj are correlated to calculate and obtain the control cycle deviation index Zkq, and the control cycle deviation index Zkq is obtained by the following formula:

[0033]

[0034] Wherein, λ1, λ2 and λ3 are all weight coefficients, and D is the fourth correction constant.

[0035] Preferably, the control cycle deviation index Zkq is compared and analyzed with a preset deviation threshold value P to obtain a corresponding deviation level result, and the specific content of the deviation level result is as follows:

[0036] If the control cycle deviation index Zkq is greater than the deviation threshold P, which is represented by Zkq>P, a first deviation level result is obtained, which means that the control cycle of the frequency converter is in an abnormal deviation range relative to the set control cycle. At this time, the system sends a first warning instruction to the debugging control panel;

[0037] If the control cycle deviation index Zkq is equal to the deviation threshold P, which is represented by Zkq=P, a second deviation level result is obtained, which means that the control cycle of the frequency converter is in an abnormal deviation range relative to the set control cycle. At this time, the system sends a second early warning instruction to the debugging control panel;

[0038] If the control cycle deviation index Zkq is less than the deviation threshold P, expressed as Zkq<P, the third deviation level result is obtained, indicating that the control cycle of the inverter is in the normal deviation range relative to the set control cycle. At this time, the system does not need to send additional warning instructions to the debugging control panel.

[0039] Preferably, according to the first warning instruction and the second warning instruction received by the debugging control panel, the following contents are specifically executed:

[0040] When the first warning instruction is received, the execution content is that the red warning light flashes, the automatic diagnosis program is started, and all key parameters and components of the inverter control system are comprehensively checked. At the same time, the data information parameters in each acquisition time period in the database are displayed through the debugging control panel, and the maintenance personnel are notified to conduct on-site inspection and manual debugging to adjust the control cycle deviation to identify and eliminate potential electromagnetic interference sources;

[0041] When the second warning instruction is received, the execution content is that the yellow warning light flashes, the continuous monitoring program is started, the system operation status is monitored in real time, the key operating parameters of the system are recorded, historical data is established, potential problems are analyzed and predicted, and maintenance personnel are notified to perform regular system self-inspection and maintenance.

[0042] The control system of the frequency converter system includes a data acquisition module, a database, an early warning module, a fitting analysis module and a debugging control module;

[0043] The data acquisition module is used to obtain environmental parameter data information in real time according to the environment in which the frequency converter is located during operation, and obtain harmonic data information and interface signal data information in each acquisition time period during the operation of the frequency converter through multiple sensors deployed inside the frequency converter, and transmit the environmental parameter data information, harmonic data information and interface signal data information to the database;

[0044] The database is used to perform data preprocessing on the harmonic data information, interface signal data information and environmental parameter data information, identify and eliminate errors and abnormal values, and store the data after normalization and standardization;

[0045] The early warning module analyzes the environmental parameter data information to generate an environmental interference index Zgr, and compares and analyzes it with a preset interference threshold G to determine whether to issue and execute a preliminary early warning instruction;

[0046] The fitting analysis module is used to extract features according to the harmonic data information and the interface signal data information in the database, and obtain the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj in turn through analysis and calculation. After machine learning calculation and dimensionless processing of the environmental interference index Zgr, the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj, the control cycle deviation index Zkq is obtained through fitting;

[0047] The debugging control module is used to compare and analyze the control cycle deviation index Zkq obtained in step S3 with a preset deviation threshold P, obtain a corresponding deviation level, and make corresponding early warning displays and debugging based on the deviation level.

[0048] The storage medium of the frequency converter system stores a computer program thereon, comprising the following steps: the computer program stores computer instructions, and when the instructions are executed by a processor, the control method of the frequency converter system is implemented.

[0049] The present invention provides a control method, system and storage medium of a frequency converter system, which have the following beneficial effects:

[0050] (1) In step S1, by deploying multiple sensors inside the inverter, environmental parameter data information, harmonic data information and interface signal data information are obtained in real time, and these data are transmitted to the database, which effectively ensures the comprehensiveness and real-time nature of data collection and provides rich basic data for subsequent analysis and processing; by real-time monitoring and recording of various parameters in different time periods during the operation of the inverter, it is possible to timely capture subtle fluctuations in environmental changes and system status, thereby improving the accuracy of system monitoring; in steps S2 and S3, by preprocessing the collected harmonic data information, interface signal data information and environmental parameter data information, identifying and eliminating errors and outliers, and storing them after normalization and standardization, the accuracy and consistency of the data are guaranteed; by generating the environmental interference index Zgr and comparing and analyzing it with the pre-set interference threshold G, it is possible to timely determine whether a preliminary warning instruction needs to be issued, thereby discovering potential problems in advance and preventing environmental interference from adversely affecting the performance and stability of the inverter system; then the preprocessed harmonic data information and interface signal data information are feature extracted and analyzed to obtain the electromagnetic interference The interference degree index Zdc and the interface signal quality inspection index Zxj are obtained, and these indexes and the environmental interference index Zgr are machine-learned and dimensionless processed, and finally the control cycle deviation index Zkq is fitted; this method effectively improves the detection and evaluation ability of the inverter control system for electromagnetic interference and interface signal quality problems through multi-parameter comprehensive analysis; in step S4, the obtained control cycle deviation index Zkq is compared and analyzed with the preset deviation threshold P to obtain the corresponding deviation level, and an early warning display and debugging are made according to the deviation level; through accurate evaluation of the deviation level and graded early warning, the system can take corresponding measures for debugging and maintenance under different degrees of control cycle deviation, so as to ensure that the inverter control system maintains the best performance and stability under various working conditions; in short, this method improves the detection and evaluation ability of the inverter system for the control cycle deviation problems caused by environmental interference, electromagnetic interference and interface signal quality factors, and ensures the stability and reliability of the system under different working conditions through a graded early warning mechanism. This method provides a solid technical foundation for the intelligent monitoring and optimization control of the inverter system, and significantly improves the overall performance of the system.

[0051] (2) By analyzing the environmental parameter data information in advance to generate the environmental interference index Zgr, and comparing it with the preset interference threshold G, it is determined whether to issue and execute a preliminary warning instruction; this preliminary warning mechanism can monitor and evaluate the operating environment of the inverter in real time, and promptly identify and warn of potential environmental interference problems; when the environmental interference index exceeds the set threshold, the system can quickly issue a warning, allowing maintenance personnel to take preventive and corrective measures as soon as possible to prevent small problems from evolving into big problems, thereby reducing the number of unexpected downtimes and maintenance costs.

[0052] (3) By extracting features from environmental parameter data information, harmonic data information and interface signal data information respectively, and analyzing and calculating, the environmental interference index Zgr, the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj are obtained in turn to generate a control cycle deviation index Zkq. This method shows significant novelty in solving the problem of inverter control cycle deviation. Traditional inverter control systems often lack effective diagnosis and adjustment mechanisms, making it difficult to identify and respond to control cycle deviation problems in a timely manner, making it difficult for system performance to meet actual application requirements. The present invention introduces and quantifies the three key factors of environmental interference, electromagnetic interference and interface signal quality, and accurately evaluates their impact on the control cycle, so that it can more accurately diagnose and adjust the system's control cycle deviation, effectively identify and respond to potential problems, and significantly improve the overall performance and reliability of the inverter in a complex environment, better meeting actual application requirements.

[0053] (4) Depending on the warning level, the system can start the automatic diagnosis program and the continuous monitoring program respectively to achieve comprehensive inspection and real-time monitoring of the inverter control system; the red warning command starts the automatic diagnosis program, conducts comprehensive inspection and debugging, and promptly discovers and eliminates potential problems; the yellow warning command starts the continuous monitoring program, records and analyzes system operating parameters in real time, establishes historical data, and predicts potential problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 A schematic diagram of the steps of a control method for a frequency converter system of the present invention;

[0055] Figure 2 It is a control system block diagram of the frequency converter system of the present invention. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] Example 1

[0058] See also Figure 1 The present invention provides a control method for a frequency converter system, comprising:

[0059] S1. According to the environment in which the frequency converter is located during operation, environmental parameter data information is obtained in real time, and harmonic data information and interface signal data information in each acquisition time period of the frequency converter during operation are obtained through multiple sensors deployed inside the frequency converter, and the environmental parameter data information, harmonic data information and interface signal data information are transmitted to the database;

[0060] S2, respectively pre-processing the harmonic data information, interface signal data information and environmental parameter data information, identifying and eliminating errors and abnormal values, and storing the data after normalization and standardization; at the same time, analyzing the environmental parameter data information to generate an environmental interference index Zgr, and comparing and analyzing it with a preset interference threshold G to determine whether to issue a preliminary warning instruction and execute it;

[0061] S3, extracting features from the harmonic data information and the interface signal data information in the database of step S2 respectively, and obtaining the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj in turn through analysis and calculation, and obtaining the control cycle deviation index Zkq through fitting after machine learning calculation and dimensionless processing of the environmental interference index Zgr, the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj;

[0062] S4. According to the control cycle deviation index Zkq obtained in step S3, compare and analyze it with the preset deviation threshold P to obtain the corresponding deviation level, and make corresponding early warning display and debugging according to the deviation level.

[0063] In this embodiment, by real-time acquisition and analysis of environmental parameters, harmonic data information and interface signal data information, and preprocessing, normalizing and standardizing these data, the environmental interference index Zgr, the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj are generated, and finally the control cycle deviation index Zkq is fitted; this method can accurately identify and eliminate errors and outliers in the data, comprehensively analyze and evaluate the inverter operating environment and its impact on system performance, and realize real-time monitoring and early warning of control cycle deviation by comparing with preset thresholds, thereby improving the reliability and stability of the inverter system, effectively coping with various interferences that may occur during operation, and ensuring efficient operation of the system in complex environments.

[0064] Example 2

[0065] Please refer to Figure 1 Specifically: according to the environment in which the inverter is located during operation, environmental parameter data information is obtained in real time, wherein the environmental parameter data information includes dust accumulation thickness Fgh, mechanical vibration Dzj, humidity Sju and temperature Thj, and transmitted to the database;

[0066] Through the current sensor and voltage sensor deployed inside the inverter, the harmonic data information of the inverter in each collection time period during operation is obtained, where the harmonic data information includes the high-frequency value Qgf of the switching element, the output harmonic distortion value Qsx and the load harmonic value Qfx, and is transmitted to the database;

[0067] The high-wave value Qgf of the switching element represents the high-frequency current value Igf and the high-wave voltage frequency Vgf generated by the switching element during the operation of the inverter; the high-wave current frequency Igf and the high-wave voltage frequency Vgf are directly collected by the current sensor and the voltage sensor to generate the high-wave value Qgf of the switching element. The high-wave value Qgf of the switching element is calculated and obtained by the following formula:

[0068]

[0069] The output harmonic distortion value Qsx is a measure of the size of the harmonic component in the inverter output signal relative to the fundamental component. It is an important indicator for evaluating the quality of the output signal, which is mainly manifested in the degradation of power quality and electromagnetic interference, so as to affect the performance and stability of the inverter system and reduce the control accuracy. Specifically, the output harmonic distortion value Qsx includes the output current harmonic distortion value and the output voltage harmonic distortion value. The output harmonic current frequency Isx and the output harmonic voltage frequency Vsx are directly collected by the current sensor and the voltage sensor to generate the output harmonic distortion value Qsx. The output harmonic distortion value Qsx is calculated and obtained by the following formula:

[0070]

[0071] In the formula, Ij represents the output fundamental current frequency, Vj represents the output fundamental voltage frequency, Expressed as output current distortion value, Expressed as output voltage distortion value;

[0072] The load harmonic value Qfx is the harmonic generated by the load motor during its own rotation and stop process when receiving the output of the inverter, which will generate electromagnetic interference and affect the normal operation of the control circuit and power electronic devices inside the inverter; the load harmonic current frequency Ifx and the load harmonic voltage frequency Vfx are directly collected by the current sensor and the voltage sensor to generate the load harmonic value Qfx, and the load harmonic value Qfx is calculated and obtained by the following formula;

[0073]

[0074] By deploying current sensors and voltage sensors inside the inverter, the interface signal data information of the inverter in each acquisition time period during operation is obtained, where the interface signal data information includes voltage noise Hdy, current noise Hdl, voltage transient value Sdy and current transient value Sdl, and is transmitted to the database.

[0075] In this embodiment, by acquiring the environmental parameters of dust coverage thickness Fgh, mechanical vibration Dzj, humidity Sju and temperature Thj in the operating environment of the inverter in real time, and combining the high-frequency value Qgf of the switching element, the output harmonic distortion value Qsx and the load harmonic value Qfx data information collected by the current sensor and the voltage sensor, as well as the voltage noise Hdy, current noise Hdl, voltage transient value Sdy and current transient value Sdl of the interface signal, various key parameters of the inverter during operation are comprehensively and accurately collected; by preprocessing, normalizing and standardizing these data, the accuracy and reliability of the data are ensured, which provides a solid foundation for the subsequent analysis and calculation of the environmental interference index Zgr, the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj.

[0076] Example 3

[0077] Please refer to Figure 1 Specifically: the environmental parameter data information after data preprocessing is analyzed to generate an environmental interference index Zgr calculated by the following formula;

[0078]

[0079] Where Fgh is the dust coverage thickness, Fgh Max It represents the preset maximum allowable value of dust coverage thickness, Dzj represents mechanical vibration, Sju represents humidity, Sju Max It represents the maximum allowable value preset for humidity, Thj represents temperature, Thj Max represents the preset maximum allowable value of the temperature, wherein k1, k2, k3 and k4 represent the preset proportional coefficients of the dust cover thickness Fgh, the mechanical vibration Dzj, the humidity Sju and the temperature Thj, respectively, and A represents the first correction constant;

[0080] A comparison analysis is performed based on the environmental interference index Zgr and the preset interference threshold G to determine whether to issue a preliminary warning instruction. The specific contents are as follows:

[0081] If the environmental interference index Zgr≤interference threshold G, it is determined that the current environment of the inverter is in a qualified state, and no additional warning instruction is issued at this time;

[0082] If the environmental interference index Zgr>interference threshold G, it is determined that the current environment of the inverter is in an unqualified state. At this time, a preliminary warning instruction is issued. The content of the preliminary warning instruction includes transmitting the environmental parameter data information to the debugging control module for visualization processing, so that maintenance personnel can view and perform maintenance according to the specific displayed information.

[0083] In this embodiment, the environmental interference index Zgr is generated by analyzing the environmental parameter data information after data preprocessing; the index is calculated by comprehensively considering the environmental parameters such as dust coverage thickness Fgh, mechanical vibration Dzj, humidity Sju and temperature Thj, combined with a preset proportional coefficient and correction constant; the environmental interference index Zgr is compared and analyzed with the preset interference threshold G, which can effectively determine the qualified state of the environment in which the inverter is located; when the environmental interference index Zgr exceeds the interference threshold G, the system automatically issues a preliminary early warning instruction and transmits the environmental parameter data information to the debugging control module for visualization processing for maintenance personnel to view and maintain; this method ensures timely identification and response to environmental interference, and improves maintenance efficiency.

[0084] Example 4

[0085] Please refer to Figure 1 Specifically: According to step S3, the harmonic data information in the database is analyzed, and after dimensionless processing, the electromagnetic interference degree index Zdc is obtained. The electromagnetic interference degree index Zdc is obtained by the following formula:

[0086]

[0087] In the formula, Qgf i Expressed as the high-voltage wave value of the switching element in the ith monitoring period, Qsx i Expressed as the output harmonic distortion value in the ith monitoring period, Qfx i It is represented by the load harmonic value in the i-th monitoring period, i=1, 2, 3, ..., n, n represents the detection period, α1, α2 and α3 are all represented by preset proportional coefficients, and α1+α2+α3=1.0, and B represents the second correction constant.

[0088] Specifically, the interface signal data information is analyzed and dimensionless processed to obtain the interface signal quality inspection index Zxj, which is obtained by the following formula:

[0089]

[0090] Where Hdy i It is expressed as the voltage noise in the ith monitoring period, Hdl iIt is represented as the current noise in the i-th monitoring period, Sdy i It is expressed as the voltage transient value in the i-th monitoring period, Sdl i It is represented as the current transient value in the i-th monitoring period, i=1, 2, 3, ..., n, n represents the detection period, a1 and a2 both represent preset proportional coefficients, and a1+a2=1.0, and C represents the third correction constant.

[0091] In this embodiment, by analyzing the harmonic data information and interface signal data information stored in the database, after dimensionless processing, the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj are respectively obtained; the electromagnetic interference degree index Zdc is calculated by comprehensively considering the high-wave value Qgf of the switching element, the output harmonic distortion value Qsx and the load harmonic value Qfx, combined with a preset proportional coefficient and a correction constant; the interface signal quality inspection index Zxj is calculated by analyzing the voltage noise Hdy, the current noise Hdl, the voltage transient value Sdy and the current transient value Sdl, combined with a preset proportional coefficient and a correction constant; the calculation method of these indexes ensures the accurate evaluation of the electromagnetic interference and the interface signal quality during the operation of the inverter, provides reliable basic data for the subsequent control cycle deviation analysis, and effectively improves the monitoring accuracy of the system.

[0092] Example 5

[0093] Please refer to Figure 1 Specifically, the environmental interference index Zgr, the electromagnetic interference index Zdc and the interface signal quality inspection index Zxj are correlated to calculate and obtain the control cycle deviation index Zkq, and the control cycle deviation index Zkq is obtained by the following formula:

[0094]

[0095] Wherein, λ1, λ2 and λ3 are all weight coefficients, and D is the fourth correction constant.

[0096] Specifically, the control cycle deviation index Zkq is compared and analyzed with a preset deviation threshold P to obtain a corresponding deviation level result, and the specific content of the deviation level result is as follows:

[0097] If the control cycle deviation index Zkq is greater than the deviation threshold P, which is represented by Zkq>P, a first deviation level result is obtained, which means that the control cycle of the frequency converter is in an abnormal deviation range relative to the set control cycle. At this time, the system sends a first warning instruction to the debugging control panel;

[0098] If the control cycle deviation index Zkq is equal to the deviation threshold P, which is represented by Zkq=P, a second deviation level result is obtained, which means that the control cycle of the frequency converter is in an abnormal deviation range relative to the set control cycle. At this time, the system sends a second early warning instruction to the debugging control panel;

[0099] If the control cycle deviation index Zkq is less than the deviation threshold P, expressed as Zkq<P, the third deviation level result is obtained, indicating that the control cycle of the inverter is in the normal deviation range relative to the set control cycle. At this time, the system does not need to send additional warning instructions to the debugging control panel.

[0100] Specifically, according to the first warning instruction and the second warning instruction received by the debugging control panel, the following contents are specifically executed:

[0101] When the first warning instruction is received, the execution content is that the red warning light flashes, the automatic diagnosis program is started, and all key parameters and components of the inverter control system are comprehensively checked. At the same time, the data information parameters in each acquisition time period in the database are displayed through the debugging control panel, and the maintenance personnel are notified to conduct on-site inspection and manual debugging to adjust the control cycle deviation to identify and eliminate potential electromagnetic interference sources;

[0102] When the second warning instruction is received, the execution content is that the yellow warning light flashes, the continuous monitoring program is started, the system operation status is monitored in real time, the key operating parameters of the system are recorded, historical data is established, potential problems are analyzed and predicted, and maintenance personnel are notified to perform regular system self-inspection and maintenance.

[0103] In this embodiment, the environmental interference index Zgr, the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj are associated to calculate and obtain the control cycle deviation index Zkq, and based on the comparative analysis of the index with the preset deviation threshold P, the deviation level result of the inverter control cycle is accurately obtained; during system operation, when the control cycle deviation index Zkq exceeds or is equal to the preset threshold, the system will issue a red or yellow warning instruction respectively, and execute the corresponding automatic diagnosis or continuous monitoring program; this method can monitor and analyze the environmental interference, electromagnetic interference and interface signal quality under the operating state of the inverter in real time, ensure timely discovery and handling of potential problems, improve the stability and control accuracy of the system, and provide strong guarantee for the reliable operation and precise control of the inverter.

[0104] Example 6

[0105] Please refer to Figure 1 and Figure 2 ,Specifically: the control system of the frequency converter system includes a data acquisition module, a database, an early warning module, a fitting analysis module and a debugging control module;

[0106] The data acquisition module is used to obtain environmental parameter data information in real time according to the environment in which the frequency converter is located during operation, and obtain harmonic data information and interface signal data information in each acquisition time period during the operation of the frequency converter through multiple sensors deployed inside the frequency converter, and transmit the environmental parameter data information, harmonic data information and interface signal data information to the database;

[0107] The database is used to perform data preprocessing on the harmonic data information, interface signal data information and environmental parameter data information, identify and eliminate errors and abnormal values, and store the data after normalization and standardization;

[0108] The early warning module analyzes the environmental parameter data information to generate an environmental interference index Zgr, and compares and analyzes it with a preset interference threshold G to determine whether to issue and execute a preliminary early warning instruction;

[0109] The fitting analysis module is used to extract features according to the harmonic data information and the interface signal data information in the database, and obtain the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj in turn through analysis and calculation. After machine learning calculation and dimensionless processing of the environmental interference index Zgr, the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj, the control cycle deviation index Zkq is obtained through fitting;

[0110] The debugging control module is used to compare and analyze the control cycle deviation index Zkq obtained in step S3 with a preset deviation threshold P, obtain a corresponding deviation level, and make corresponding early warning displays and debugging based on the deviation level.

[0111] The storage medium of the frequency converter system stores a computer program thereon, comprising the following steps, wherein the computer program stores computer instructions, and when the instructions are executed by a processor, the control method of the frequency converter system as described above is implemented.

[0112] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A control method for a frequency converter system, characterized in that: include, S1. According to the environment in which the frequency converter is located during operation, environmental parameter data information is obtained in real time, and harmonic data information and interface signal data information in each acquisition time period of the frequency converter during operation are obtained through multiple sensors deployed inside the frequency converter, and the environmental parameter data information, harmonic data information and interface signal data information are transmitted to the database; S2, respectively pre-processing the harmonic data information, interface signal data information and environmental parameter data information, identifying and eliminating errors and abnormal values, and storing the data after normalization and standardization; at the same time, analyzing the environmental parameter data information to generate an environmental interference index Zgr, and comparing and analyzing it with a preset interference threshold G to determine whether to issue a preliminary warning instruction and execute it; S3, extracting features from the harmonic data information and the interface signal data information in the database of step S2 respectively, and obtaining the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj in turn through analysis and calculation, and obtaining the control cycle deviation index Zkq through fitting after machine learning calculation and dimensionless processing of the environmental interference index Zgr, the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj; S4. According to the control cycle deviation index Zkq obtained in step S3, compare and analyze it with the preset deviation threshold P to obtain the corresponding deviation level, and make corresponding early warning display and debugging according to the deviation level.

2. The control method of the frequency converter system according to claim 1, characterized in that: According to the environment in which the inverter is located during operation, the environmental parameter data information is obtained in real time, wherein the environmental parameter data information includes dust accumulation thickness Fgh, mechanical vibration Dzj, humidity Sju and temperature Thj, and transmitted to the database; Through the current sensor and voltage sensor deployed inside the inverter, the harmonic data information of the inverter in each collection time period during operation is obtained, where the harmonic data information includes the high-frequency value Qgf of the switching element, the output harmonic distortion value Qsx and the load harmonic value Qfx, and is transmitted to the database; By deploying current sensors and voltage sensors inside the inverter, the interface signal data information of the inverter in each acquisition time period during operation is obtained, where the interface signal data information includes voltage noise Hdy, current noise Hdl, voltage transient value Sdy and current transient value Sdl, and is transmitted to the database.

3. The control method of the frequency converter system according to claim 2, characterized in that: The environmental parameter data information after data preprocessing is analyzed to generate the environmental interference index Zgr calculated by the following formula: Where Fgh is the dust coverage thickness, Fgh Max It represents the preset maximum allowable value of dust coverage thickness, Dzj represents mechanical vibration, Sju represents humidity, Sju Max It represents the maximum allowable value preset for humidity, Thj represents temperature, Thj Max represents the preset maximum allowable value of the temperature, wherein k1, k2, k3 and k4 represent the preset proportional coefficients of the dust cover thickness Fgh, the mechanical vibration Dzj, the humidity Sju and the temperature Thj, respectively, and A represents the first correction constant; A comparison analysis is performed based on the environmental interference index Zgr and the preset interference threshold G to determine whether to issue a preliminary warning instruction. The specific contents are as follows: If the environmental interference index Zgr≤interference threshold G, it is determined that the current environment of the inverter is in a qualified state, and no additional warning instruction is issued at this time; If the environmental interference index Zgr>interference threshold G, it is determined that the current environment of the inverter is in an unqualified state. At this time, a preliminary warning instruction is issued. The content of the preliminary warning instruction includes transmitting the environmental parameter data information to the debugging control module for visualization processing, so that maintenance personnel can view and perform maintenance according to the specific displayed information.

4. The control method of the frequency converter system according to claim 2, characterized in that: According to step S3, the harmonic data information in the database is analyzed, and after dimensionless processing, the electromagnetic interference degree index Zdc is obtained. The electromagnetic interference degree index Zdc is obtained by the following formula: In the formula, Qgf i Expressed as the high-voltage wave value of the switching element in the ith monitoring period, Qsx i Expressed as the output harmonic distortion value in the ith monitoring period, Qfx i It is represented as the load harmonic value in the i-th monitoring period, i=1, 2, 3, ..., n, n represents the detection period, α1, α2 and α3 all represent preset proportional coefficients, and B represents the second correction constant.

5. The control method of the frequency converter system according to claim 2, characterized in that: The interface signal data information is analyzed and dimensionlessly processed to obtain the interface signal quality inspection index Zxj, which is obtained by the following formula: Where Hdy i It is expressed as the voltage noise in the ith monitoring period, Hdl i It is represented as the current noise in the i-th monitoring period, Sdy i It is expressed as the voltage transient value in the i-th monitoring period, Sdl i It is represented as the current transient value in the i-th monitoring period, i=1, 2, 3, ..., n, n is the detection period, a1 and a2 are both represented as preset proportional coefficients, and C is represented as the third correction constant.

6. The control method of the frequency converter system according to claim 1, characterized in that: The environmental interference index Zgr, the electromagnetic interference index Zdc and the interface signal quality inspection index Zxj are correlated to calculate and obtain the control cycle deviation index Zkq, which is obtained by the following formula: Wherein, λ1, λ2 and λ3 are all weight coefficients, and D is the fourth correction constant.

7. The control method of the frequency converter system according to claim 1, characterized in that: The control cycle deviation index Zkq is compared and analyzed with the preset deviation threshold P to obtain the corresponding deviation level result, the specific content of the deviation level result is as follows: If the control cycle deviation index Zkq is greater than the deviation threshold P, which is represented by Zkq>P, a first deviation level result is obtained, which means that the control cycle of the frequency converter is in an abnormal deviation range relative to the set control cycle. At this time, the system sends a first warning instruction to the debugging control panel; If the control cycle deviation index Zkq is equal to the deviation threshold P, which is represented by Zkq=P, a second deviation level result is obtained, which means that the control cycle of the frequency converter is in an abnormal deviation range relative to the set control cycle. At this time, the system sends a second early warning instruction to the debugging control panel; If the control cycle deviation index Zkq is less than the deviation threshold P, expressed as Zkq<P, the third deviation level result is obtained, indicating that the control cycle of the inverter is in the normal deviation range relative to the set control cycle. At this time, the system does not need to send additional warning instructions to the debugging control panel.

8. The control method of the frequency converter system according to claim 7, characterized in that: According to the first warning instruction and the second warning instruction received by the debugging control panel, the following contents are specifically executed: When the first warning instruction is received, the red warning light flashes, the automatic diagnosis program is started, and all key parameters and components of the inverter control system are comprehensively checked. At the same time, the data information parameters in each acquisition time period in the database are displayed through the debugging control panel, and the maintenance personnel are notified to conduct on-site inspection and manual debugging to adjust the control cycle deviation and identify and eliminate potential electromagnetic interference sources; When the second warning instruction is received, the execution content is that the yellow warning light flashes, the continuous monitoring program is started, the system operation status is monitored in real time, the key operating parameters of the system are recorded, historical data is established, potential problems are analyzed and predicted, and maintenance personnel are notified to perform regular system self-inspection and maintenance.

9. A control system for a frequency converter system, comprising the control method for the frequency converter system according to any one of claims 1 to 8, characterized in that: It includes data acquisition module, database, early warning module, fitting analysis module and debugging control module; The data acquisition module is used to obtain environmental parameter data information in real time according to the environment in which the frequency converter is located during operation, and obtain harmonic data information and interface signal data information in each acquisition time period during the operation of the frequency converter through multiple sensors deployed inside the frequency converter, and transmit the environmental parameter data information, harmonic data information and interface signal data information to the database; The database is used to perform data preprocessing on the harmonic data information, interface signal data information and environmental parameter data information, identify and eliminate errors and abnormal values, and store the data after normalization and standardization; The early warning module analyzes the environmental parameter data information to generate an environmental interference index Zgr, and compares and analyzes it with a preset interference threshold G to determine whether to issue and execute a preliminary early warning instruction; The fitting analysis module is used to extract features according to the harmonic data information and the interface signal data information in the database, and obtain the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj in turn through analysis and calculation. After machine learning calculation and dimensionless processing of the environmental interference index Zgr, the electromagnetic interference degree index Zdc and the interface signal quality inspection index Zxj, the control cycle deviation index Zkq is obtained through fitting; The debugging control module is used to compare and analyze the control cycle deviation index Zkq obtained in step S3 with a preset deviation threshold P, obtain a corresponding deviation level, and make corresponding early warning displays and debugging based on the deviation level.

10. A storage medium of a frequency converter system, on which a computer program is stored, characterized in that: The computer program stores computer instructions, and when the instructions are executed by a processor, the control method of the frequency converter system according to any one of claims 1 to 8 is implemented.

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