Frequency converter harmonic control method and device applied to high-capacity compressed air energy storage

Abstract

The invention discloses a frequency converter harmonic control method and device applied to high-capacity compressed air energy storage, and belongs to the technical field of electric digital data processing. Until how to form a backup message when the input voltage value of the motor of the air compressor is backed up is determined; according to the backup anomalous message, obtaining a backup bandwidth floating time period corresponding to the formation of the backup anomalous message until whether the voltage value receiving bandwidth is a factor for determining the voltage value backup bandwidth is determined; if the receiving bandwidth is a factor for determining the voltage value backup bandwidth, a receiving bandwidth adjustment amount is obtained, and the current voltage value receiving bandwidth is adjusted according to the receiving bandwidth adjustment amount. The defects that abnormal analysis on the backup bandwidth is lacked in the period of backing up the input voltage value of the motor of the air compressor at present, and the reliability of the input voltage value of the motor of the air compressor is unfavorable are effectively avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrical digital data processing, and in particular relates to a frequency converter harmonic control method and device applied to large-capacity compressed air energy storage. Background Art

[0002] Large-capacity compressed air energy storage technology realizes the storage and management of electric energy through the mutual conversion of electric energy and the internal energy of cryogenic liquid air. It improves the controllability of the electric field output power and improves stability. Due to the randomness and instability of renewable energy sources such as solar energy and wind energy, it has a certain impact on the power grid. As a long-term energy storage, large-capacity compressed air energy storage has the advantages of large energy storage capacity, high safety, long life, economy and environmental protection, and plays an important technical support role in the construction of new power systems in the future.

[0003] On the other hand, the frequency converter used for large-capacity compressed air energy storage is often electrically connected to the motor of the air compressor, so that the frequency converter used for large-capacity compressed air energy storage can adjust the speed of the motor of the air compressor. In actual applications, the structure of the electrical connection between the frequency converter used for large-capacity compressed air energy storage and the motor of the air compressor often produces resonance problems. Therefore, as mentioned in the prior art scheme with patent publication number "CN221862432U", a resonant voltage suppression circuit is connected between the frequency converter used for large-capacity compressed air energy storage and the motor of the air compressor (the resonant voltage suppression circuit includes a reactor and a damping circuit arranged in parallel, one end of the reactor is connected to the output end of the frequency converter used for large-capacity compressed air energy storage, and the other end of the reactor is sequentially connected to the cable and the motor of the air compressor), so as to suppress the resonant voltage of the motor of the air compressor when driven by the frequency converter used for large-capacity compressed air energy storage, so that the frequency converter used for large-capacity compressed air energy storage can more effectively adjust the speed of the motor of the air compressor.

[0004] In order to better control the resonant voltage of the air compressor motor when driven by a frequency converter for large-capacity compressed air energy storage, it is also necessary to monitor and back up the input voltage value of the air compressor motor, so as to facilitate the subsequent viewing of the harmonic condition of the input voltage of the air compressor motor. Therefore, it is necessary to set up a corresponding voltage sensor and an industrial computer connected thereto. The voltage sensor is used to collect the input voltage value of the air compressor motor and transmit it to the industrial computer for display and backup. In specific applications, abnormal conditions of the backup bandwidth are often not conducive to the reliability of the backup of the input voltage value of the air compressor motor. However, during the backup of the input voltage value of the air compressor motor, there is a lack of analysis of the abnormality of the backup bandwidth, which is not conducive to the reliability of the input voltage value of the backup air compressor motor. Summary of the invention

[0005] In order to solve the defects in the prior art, the present invention proposes a frequency converter harmonic control device and method for large-capacity compressed air energy storage. The present invention effectively avoids the defects in the prior art of lack of analysis of backup bandwidth anomalies during the input voltage value of the backup air compressor motor and the reliability of the input voltage value of the backup air compressor motor.

[0006] The present invention uses the following technical solutions.

[0007] A frequency converter harmonic control method applied to large-capacity compressed air energy storage, comprising: A resonance voltage suppression circuit connected between a frequency converter applied to large-capacity compressed air energy storage and a motor of an air compressor is used to suppress the resonance voltage of the motor of the air compressor when driven by the frequency converter applied to large-capacity compressed air energy storage; The voltage sensor collects the input voltage value of the motor of the air compressor and transmits it to the display screen of the industrial computer for display and to the hard disk of the industrial computer for backup; The voltage sensor collects the input voltage value of the air compressor motor and transmits it to the hard disk of the industrial computer for backup, which also includes: Step 1, during the period of backing up the input voltage value of the motor of the air compressor, the backup information of the industrial computer is obtained in real time until it is determined how to form the backup information when the input voltage value of the motor of the air compressor is backed up; Step 2, according to the backup abnormality message, obtain the corresponding backup bandwidth floating time period when the backup abnormality message is generated, until it is determined whether the voltage value receiving bandwidth is the factor that determines the voltage value backup bandwidth; Step 3, if the receiving bandwidth is a factor that determines the voltage value backup bandwidth, the receiving bandwidth adjustment amount is obtained, and the current voltage value receiving bandwidth is adjusted according to the receiving bandwidth adjustment amount.

[0008] Further, in Step 1, the backup information includes a backup bandwidth value, and the backup bandwidth value is analyzed to obtain the voltage value backup presentation amount. , according to the backup presentation volume , determine how to generate backup information when the input voltage value of the motor of the backup air compressor is high, and the backup information includes backup reasonable information and backup abnormal information.

[0009] Further, in Step 1, during the input voltage value period of the motor of the backup air compressor, the input voltage value period of the motor of the backup air compressor is cut by a number of backup moments, the backup moments are taken as the horizontal axis value of the rectangular coordinate system, the backup bandwidth value corresponding to the backup moments are taken as the vertical axis value of the rectangular coordinate system, and the rectangular coordinate system is constructed in this way, the backup bandwidth value corresponding to the backup moments is marked in the rectangular coordinate system to form marking points, and then two adjacent marking points are connected by straight lines to obtain the backup bandwidth change polyline; The backup bandwidth basic quantity is marked on the vertical axis of the rectangular coordinate system to obtain the backup bandwidth origin point, and a horizontal line is drawn through the backup bandwidth origin point to define it as the backup bandwidth origin line.

[0010] Furthermore, in Step 1, the section where the backup bandwidth variation broken line overlaps with the backup bandwidth original line is defined as the backup bandwidth overlapping line, the section within the backup bandwidth variation broken line that is above the backup bandwidth original line is defined as the backup bandwidth upper floating broken line, and the section within the backup bandwidth variation broken line that is below the backup bandwidth original line is defined as the backup bandwidth lower floating broken line. The number of backup bandwidth upper floating broken lines and the number of backup bandwidth lower floating broken lines are summed up, and the sum of the number of backup bandwidth upper floating broken lines and the number of backup bandwidth lower floating broken lines is taken as the number of backup bandwidth floating broken lines, and the number of backup bandwidth floating broken lines divided by the number of all broken line segments during the input voltage value of the motor of the backup air compressor is taken as the backup bandwidth floating broken line number ratio. ; The integral between the upper floating polyline of the backup bandwidth and the original line of the backup bandwidth is obtained, and the integral between the upper floating polyline of the backup bandwidth and the original line of the backup bandwidth is used as the upper floating integral of the backup bandwidth. The integral between the lower floating polyline of the backup bandwidth and the original line of the backup bandwidth is obtained, and the integral between the lower floating polyline of the backup bandwidth and the original line of the backup bandwidth is used as the lower floating integral of the backup bandwidth. The upper floating integral of the backup bandwidth is added to the lower floating integral of the backup bandwidth, and the amount obtained by adding the upper floating integral of the backup bandwidth is used as the floating integral of the backup bandwidth. The amount obtained by dividing the floating integral of the backup bandwidth by the critical value of the floating integral of the backup bandwidth defined in advance is used as the floating integral ratio of the backup bandwidth. .

[0011] Furthermore, in Step 1, the number of backup bandwidth floating lines is Floating credit ratio of backup bandwidth The treatment is performed, that is, through the equation: Calculate the backup data , here, , are all predefined ratio factors, and , All are above zero; Back up the volume Compare with the pre-defined backup threshold execution: If the backup presents the amount If the backup value is lower than the critical value, a backup abnormality message will be generated; If the backup presents the amount If the backup value is not less than the critical value, a backup validity message is generated.

[0012] Further, in Step 2, the backup bandwidth floating time period includes the backup bandwidth upper floating time period and the backup bandwidth lower floating time period. The voltage value corresponding to the backup time is obtained to receive the bandwidth value immediately. The overlapping time interval ratio is obtained based on the voltage value and the backup bandwidth floating time period. Overlap ratio with change range , based on the overlap time ratio Overlap ratio with change range Execute analysis to obtain the decision coordination amount , based on the decision of the amount of coordination Determine whether the voltage value receiving bandwidth is a factor in determining the voltage value backup bandwidth.

[0013] Further, in Step 2, the backup time is regarded as the horizontal axis value of the rectangular coordinate system, and the receiving information corresponding to the backup time is regarded as the vertical axis value of the rectangular coordinate system, so as to construct the rectangular coordinate system. Here, the receiving information includes the voltage value and the instant receiving bandwidth value, and the voltage value and the instant receiving bandwidth value corresponding to the backup time are obtained. The voltage value and the instant receiving bandwidth value corresponding to the backup time are marked in the rectangular coordinate system to form marking points, and the adjacent marking points are connected with straight lines to obtain the floating polyline of the instant receiving bandwidth. The voltage value, which is the basic quantity of the instantaneous receiving bandwidth value, is regarded as the primitive value and marked on the vertical axis of the rectangular coordinate system. A horizontal line is drawn through the primitive value and defined as the receiving bandwidth primitive line.

[0014] Further, in Step 2, the section of the receiving bandwidth variation polyline above the receiving bandwidth primitive line is defined as the receiving bandwidth upper floating polyline, the section of the receiving bandwidth variation polyline below the receiving bandwidth primitive line is defined as the receiving bandwidth lower floating polyline, the time period corresponding to the receiving bandwidth upper floating polyline is obtained and defined as the receiving bandwidth upper floating time period, the time period corresponding to the receiving bandwidth lower floating polyline is obtained and defined as the receiving bandwidth lower floating time period; According to the backup abnormality message, the corresponding backup bandwidth upper floating time period and backup bandwidth lower floating time period when the backup abnormality message is generated are obtained.

[0015] Further, in Step 2, the overlapping time period between the upper floating time period of the receiving bandwidth and the upper floating time period of the backup bandwidth is defined as the upper overlapping time period, and the overlapping time period between the lower floating time period of the receiving bandwidth and the lower floating time period of the backup bandwidth is defined as the lower overlapping time period; The upper overlapping time period and the lower overlapping time period are both regarded as overlapping time periods, and the time interval corresponding to the overlapping time period is defined as the overlapping time interval; The overlap time ratio is obtained by dividing the overlap time by the total time corresponding to the input voltage value of the backup air compressor motor. ; Select several moments in the overlapping time period as analysis moments, obtain derivative values ​​of the backup bandwidth change line and the instant receiving bandwidth floating line corresponding to the overlapping time period at the analysis moments respectively, and divide the derivative value of the backup bandwidth change line corresponding to the overlapping time period at the analysis moment by the derivative value of the instant receiving bandwidth floating line corresponding to the overlapping time period at the analysis moment to obtain the derivative ratio at the analysis moment, divide the accumulated derivative ratios at all analysis moments by the number of analysis moments to obtain the corresponding average, and the corresponding average is the derivative ratio in the overlapping time period; The derivative ratios of all overlapping time periods are accumulated, and the amount obtained by dividing the accumulated amount by the number of overlapping time periods is the mean derivative ratio. The amount obtained by subtracting the mean derivative ratio from the derivative ratio is defined as , It is the derivative ratio offset. All the derivative ratio offsets are accumulated. The accumulated amount divided by the number of derivative ratio offsets is the average derivative ratio offset. Compare the derivative ratio offset and the derivative ratio offset mean: If the derivative ratio offset is higher than the derivative ratio offset mean, the corresponding overlapping time period of the derivative ratio offset is defined as an abnormal overlapping time period; If the derivative ratio offset is not higher than the derivative ratio offset mean, the overlapping time period corresponding to the derivative ratio offset is defined as a reasonable overlapping time period; The number of reasonable overlapping time periods in the total overlapping time periods is calculated, and the number of reasonable overlapping time periods divided by the number of overlapping time periods is used as the overlap ratio of the change range. ; Overlap time ratio Overlap ratio with change range Perform the treatment via the equation: Operation to determine the amount of coordination , here, and are all predefined ratio factors, and and All are above zero; Determine the amount of coordination Compare this to the pre-defined decision coordination threshold execution: If the decision is made on the amount of coordination If it is higher than the decision coordination threshold, it means that the voltage value receiving bandwidth is the determining factor of the voltage value backup bandwidth; If the decision on the amount of coordination If it is not higher than the decision coordination critical value, it means that the voltage value receiving bandwidth is not the determining factor of the voltage value backup bandwidth.

[0016] Furthermore, in Step 3, the backup bandwidth value at the current moment is obtained, and the amount obtained by subtracting the backup bandwidth basic amount from the backup bandwidth value is used as the backup bandwidth adjustment amount, and the amount obtained by dividing the backup bandwidth adjustment amount by the mean of the derivative ratio is used as the receiving bandwidth adjustment amount; The voltage value receiving bandwidth of the industrial computer at the current moment is adjusted according to the receiving bandwidth adjustment amount.

[0017] A frequency converter harmonic control device applied to large-capacity compressed air energy storage, comprising: A resonant voltage suppression circuit is connected between the frequency converter used for large-capacity compressed air energy storage and the motor of the air compressor; It also includes: a voltage sensor and an industrial computer connected thereto, wherein the voltage sensor is used to collect the input voltage value of the motor of the air compressor and transmit it to the display screen of the industrial computer for display and to the hard disk of the industrial computer for backup; Industrial computers also include: The identification module 1 is used to obtain the backup information of the industrial computer in real time during the input voltage value of the motor of the backup air compressor, until it is determined how to form the backup message when the input voltage value of the motor of the backup air compressor is determined; The second identification module is used to obtain the corresponding backup bandwidth floating time period when the backup abnormality message is generated according to the backup abnormality message, until it is determined whether the voltage value receiving bandwidth is a factor that determines the voltage value backup bandwidth; The adjustment module is used to obtain a reception bandwidth adjustment amount if the reception bandwidth is a factor determining the voltage value backup bandwidth, and to adjust the current voltage value reception bandwidth according to the reception bandwidth adjustment amount.

[0018] The beneficial effects of the present invention are that, compared with the prior art, the technical effects of the present invention include: Perform analysis based on the backup bandwidth value to obtain the voltage value backup presentation amount , according to the backup presentation volume , determine how to generate backup information when the input voltage value of the motor of the backup air compressor is determined, the present invention monitors the backup bandwidth in real time and calculates the backup presentation quantity according to the voltage value calculated by the backup bandwidth The backup status can be flexibly estimated, so that hidden problems during the backup period can be immediately detected, and the reliability of the voltage value backup can be improved; the present invention obtains the corresponding backup bandwidth floating time period when the backup abnormality message is formed according to the backup abnormality message, and obtains the voltage value corresponding to the backup time instant receiving bandwidth value, and obtains the decision coordination amount according to the voltage value instant receiving bandwidth value and the backup bandwidth floating time period analysis. , based on the decision of the amount of coordination Determine whether the voltage value receiving bandwidth is a factor that determines the voltage value backup bandwidth. If the receiving bandwidth is a factor that determines the voltage value backup bandwidth, adjust the current receiving bandwidth according to the receiving bandwidth adjustment amount. The present invention analyzes the changes in the receiving bandwidth during the input voltage value transmission period in detail through the floating of the backup bandwidth. Through overlapping analysis, it is determined whether the voltage value receiving bandwidth is a factor that causes the abnormal voltage value backup bandwidth. This is suitable for improving the function of backing up the input voltage value of the motor of the air compressor and improving the reliability of the input voltage value backup of the motor of the air compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a flow chart of the frequency converter harmonic control method applied to large-capacity compressed air energy storage described in the present invention; Figure 2 It is a partial structural diagram of the frequency converter harmonic control device applied to large-capacity compressed air energy storage described in the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely expressed in conjunction with the drawings in the embodiments of the present invention. The embodiments expressed in this application are only partial embodiments of the present invention, not all embodiments. According to the spirit of the present invention, other embodiments obtained by technicians in this field without creative work are all within the protection scope of the present invention.

[0021] like Figure 1 As shown, the present invention discloses a method for controlling harmonics of a frequency converter applied to large-capacity compressed air energy storage, comprising: The resonance voltage of the motor of the air compressor when driven by the inverter used for large-capacity compressed air energy storage is suppressed by a resonance voltage suppression circuit connected between the inverter used for large-capacity compressed air energy storage and the motor of the air compressor (the resonance voltage suppression circuit includes a reactor and a damping circuit connected in parallel, one end of the reactor is connected to the output end of the inverter used for large-capacity compressed air energy storage, and the other end of the reactor is connected in sequence to a cable and the motor of the air compressor), so that the inverter used for large-capacity compressed air energy storage can more effectively adjust the speed of the motor of the air compressor; The voltage sensor collects the input voltage value of the motor of the air compressor and transmits it to the display screen of the industrial computer for display and to the hard disk of the industrial computer for backup, so as to facilitate the subsequent checking of the harmonic status of the input voltage of the motor of the air compressor; The voltage sensor collects the input voltage value of the air compressor motor and transmits it to the hard disk of the industrial computer for backup, which also includes: Step 1, during the period of backing up the input voltage value of the motor of the air compressor, the backup information of the industrial computer is obtained in real time until it is determined how to form the backup information when the input voltage value of the motor of the air compressor is backed up; In a preferred but non-limiting embodiment of the present invention, in Step 1, the backup information includes a backup bandwidth value, and the backup bandwidth value is analyzed to obtain the voltage value backup presentation amount. , according to the backup presentation volume , determine how to generate backup information when the input voltage value of the motor of the backup air compressor is changed, and the backup information includes backup reasonable information and backup abnormal information. The backup bandwidth value is the specific value of the backup bandwidth.

[0022] The backup bandwidth value can be detected by CrystalDiskMark software. The backup bandwidth value is the speed of the input voltage value of the motor of the backup air compressor at the corresponding backup time.

[0023] In a preferred but non-limiting embodiment of the present invention, in Step 1, during the input voltage value period of the motor of the backup air compressor, the input voltage value period of the motor of the backup air compressor is cut into multiple segments by a number of backup moments (the cutting may be equidistant cutting), the backup moment is taken as the horizontal axis value of the rectangular coordinate system, the backup bandwidth value corresponding to the backup moment is taken as the vertical axis value of the rectangular coordinate system, and a rectangular coordinate system is constructed in this way, the backup bandwidth value corresponding to the backup moment is marked in the rectangular coordinate system to form marking points, and then two adjacent marking points are connected by straight lines to obtain a backup bandwidth change polyline; The backup bandwidth basic quantity is marked on the vertical axis of the rectangular coordinate system to obtain the backup bandwidth origin point, and a horizontal line is drawn through the backup bandwidth origin point (the horizontal line passes through the backup bandwidth origin point), which is defined as the backup bandwidth origin line.

[0024] The basic amount of backup bandwidth may be an average of the backup bandwidth values ​​corresponding to several backup moments during the past period in which the input voltage value of the compressor motor was backed up on the hard disk of the industrial computer.

[0025] In a preferred but non-restrictive embodiment of the present invention, in Step 1, the section where the backup bandwidth variation broken line overlaps with the backup bandwidth original line is defined as the backup bandwidth overlapping line, the section within the backup bandwidth variation broken line that is above the backup bandwidth original line is defined as the backup bandwidth upper floating broken line, the section within the backup bandwidth variation broken line that is below the backup bandwidth original line is defined as the backup bandwidth lower floating broken line, the number of backup bandwidth upper floating broken lines and the number of backup bandwidth lower floating broken lines are summed up, and the sum of the number of backup bandwidth upper floating broken lines and the number of backup bandwidth lower floating broken lines is taken as the number of backup bandwidth floating broken lines, and the sum of the number of backup bandwidth floating broken lines divided by the number of all broken line segments during the input voltage value of the motor of the backup air compressor (the number of all broken line segments is the sum of the number of backup bandwidth floating broken lines and the number of backup bandwidth overlapping lines) is taken as the backup bandwidth floating broken line number ratio. ; Get the integral between the upper floating polyline of the backup bandwidth and the original line of the backup bandwidth (the integral is the sum of the integrals of the segments of the upper floating polyline of the backup bandwidth formed by the intersection of the upper floating polyline of the backup bandwidth and the original line of the backup bandwidth minus the integral of the segments of the original line of the backup bandwidth formed by the intersection of the upper floating polyline of the backup bandwidth and the original line of the backup bandwidth), and take the integral between the upper floating polyline of the backup bandwidth and the original line of the backup bandwidth as the upper floating integral of the backup bandwidth, and get the integral between the lower floating polyline of the backup bandwidth and the original line of the backup bandwidth (the integral is the sum of the integrals of the segments of the upper floating polyline of the backup bandwidth and the original line of the backup bandwidth The sum of the integrals of the segments of the backup bandwidth lower floating polyline formed by the intersection of the backup bandwidth lower floating polyline and the backup bandwidth primitive line is subtracted from the integral of the segment of the backup bandwidth primitive line formed by the intersection of the backup bandwidth lower floating polyline and the backup bandwidth primitive line, and the integral between the backup bandwidth lower floating polyline and the backup bandwidth primitive line is taken as the backup bandwidth lower floating integral, and the total backup bandwidth upper floating integral is added to the backup bandwidth lower floating integral, and the sum is taken as the backup bandwidth floating integral, and the backup bandwidth floating integral is divided by the backup bandwidth floating integral critical value defined in advance according to specific requirements as the backup bandwidth floating integral ratio. .

[0026] In a preferred but non-limiting embodiment of the present invention, in Step 1, the number of backup bandwidth floating broken lines is Floating credit ratio of backup bandwidth The treatment is performed, that is, through the equation: Calculate the backup data , here, , are ratio factors predefined according to specific requirements, and , All are above zero; Back up the volume Compared with the backup presentation thresholds defined in advance according to specific requirements: If the backup presents the amount If the backup voltage is lower than the critical value, a backup abnormality message is generated; the backup abnormality message can be a pre-defined representation that during the period when the input voltage value of the motor of the backup air compressor is increased, a message that there is a backup problem is generated, and the message can be transmitted to the display screen of the industrial computer for display.

[0027] If the backup presents the amount If the backup voltage is not lower than the critical value, a backup reasonable message is generated. The backup reasonable message can be a pre-defined representation that during the input voltage value of the motor of the backup air compressor, a backup problem message is generated, which can be transmitted to the display screen of the industrial computer for display.

[0028] The backup volume The ratio of the number of floating lines to and floating points ratio The amount of backup presented after the execution of the processing It reflects the high efficiency of voltage value backup, and the number of floating broken lines is It reflects the specific backup bandwidth of the input voltage value and the number of broken line segments with different basic backup bandwidth during the backup period, and the floating integral ratio It reflects the abnormal amplitude of the backup bandwidth when the input voltage value is backed up.

[0029] During the input voltage value of the motor of the backup air compressor, the backup information is obtained in real time. Here, the backup information includes the backup bandwidth value. The analysis is performed according to the backup bandwidth value to obtain the voltage value backup presentation amount. , according to the backup presentation volume , determine how to generate backup information when the input voltage value of the motor of the backup air compressor is used, the backup information includes backup reasonable information and backup abnormal information, the present invention detects the backup bandwidth in real time and calculates the backup presentation amount according to the voltage value calculated by the backup bandwidth To flexibly estimate the backup status, so that hidden problems during the backup period can be detected immediately and the reliability of input voltage backup can be improved.

[0030] Step 2, according to the backup abnormality message, obtain the corresponding backup bandwidth floating time period when the backup abnormality message is generated, until it is determined whether the voltage value receiving bandwidth is the factor that determines the voltage value backup bandwidth; In a preferred but non-limiting embodiment of the present invention, in Step 2, the backup bandwidth floating time period includes a backup bandwidth upper floating time period and a backup bandwidth lower floating time period, and the voltage value corresponding to the backup time instant receiving bandwidth value is obtained (the voltage value corresponding to the backup time instant receiving bandwidth value is the speed at which the industrial computer receives the input voltage value at the backup time, and the receiving bandwidth value can be obtained through the resource monitor tool in the operating system of the industrial computer), and the overlapping time interval ratio is obtained according to the voltage value instant receiving bandwidth value and the backup bandwidth floating time period. Overlap ratio with change range , based on the overlap time ratio Overlap ratio with change range Execute analysis to obtain the decision coordination amount , based on the decision of the amount of coordination Determine whether the voltage value receiving bandwidth is a factor in determining the voltage value backup bandwidth.

[0031] In a preferred but non-limiting embodiment of the present invention, in Step 2, the backup time is regarded as the horizontal axis value of the rectangular coordinate system, and the receiving information corresponding to the backup time is regarded as the vertical axis value of the rectangular coordinate system, so as to construct a rectangular coordinate system, where the receiving information includes the voltage value instant receiving bandwidth value, and the voltage value instant receiving bandwidth value corresponding to the backup time is obtained, and the voltage value instant receiving bandwidth value corresponding to the backup time is marked in the rectangular coordinate system to form a marking point, and the adjacent marking points are connected by straight lines to obtain the instant receiving bandwidth floating polyline; The voltage value, which is the basic quantity of the instantaneous receiving bandwidth value, is taken as the primitive value and marked on the vertical axis of the rectangular coordinate system. A horizontal line is drawn through the primitive value (the horizontal line passes through the primitive value on the vertical axis), and it is defined as the receiving bandwidth primitive line.

[0032] The basic amount of the voltage value instant receiving bandwidth value may be an average of the voltage value instant receiving bandwidth values ​​corresponding to several backup moments during the past period in which the input voltage value of the compressor motor was backed up on the hard disk of the industrial computer.

[0033] In a preferred but non-restrictive implementation of the present invention, in Step 2, the section of the receiving bandwidth variation polyline above the receiving bandwidth primitive line is defined as the receiving bandwidth upper floating polyline, the section of the receiving bandwidth variation polyline below the receiving bandwidth primitive line is defined as the receiving bandwidth lower floating polyline, the time period corresponding to the receiving bandwidth upper floating polyline (the time period is the time period formed by the receiving bandwidth upper floating polyline on the horizontal axis of the rectangular coordinate system) is obtained, and it is defined as the receiving bandwidth upper floating time period, the time period corresponding to the receiving bandwidth lower floating polyline (the time period is the time period formed by the receiving bandwidth lower floating polyline on the horizontal axis of the rectangular coordinate system) is obtained, and it is defined as the receiving bandwidth lower floating time period; According to the backup abnormality message, the corresponding backup bandwidth upper floating time period and backup bandwidth lower floating time period when the backup abnormality message is formed are obtained. (When the backup abnormality message is formed, the time period formed by the corresponding backup bandwidth upper floating line on the horizontal axis of the rectangular coordinate system during the input voltage value of the motor of the backup air compressor corresponding to the backup abnormality message is the corresponding backup bandwidth upper floating time period when the backup abnormality message is formed, and the time period formed by the corresponding backup bandwidth lower floating line on the horizontal axis of the rectangular coordinate system during the input voltage value of the motor of the backup air compressor corresponding to the backup abnormality message is the corresponding backup bandwidth lower floating time period when the backup abnormality message is formed).

[0034] In a preferred but non-limiting embodiment of the present invention, in Step 2, the overlapping time period between the upper floating time period of the receiving bandwidth and the upper floating time period of the backup bandwidth is defined as the upper overlapping time period, and the overlapping time period between the lower floating time period of the receiving bandwidth and the lower floating time period of the backup bandwidth is defined as the lower overlapping time period; The upper overlapping time period and the lower overlapping time period are both regarded as overlapping time periods, and the time interval size corresponding to the overlapping time period (the time interval size corresponding to the overlapping time period is the cumulative sum of the time interval sizes of all the upper overlapping time periods and the time interval sizes of the lower overlapping time periods) is defined as the overlapping time interval; The overlap time ratio is obtained by dividing the overlap time by the total time corresponding to the input voltage value of the backup air compressor motor. ; Select several moments in the overlapping time period as analysis moments (the selection can be arbitrary), respectively obtain the derivative values ​​of the backup bandwidth change broken line and the instant receiving bandwidth floating broken line corresponding to the overlapping time period at the analysis moments (the derivative value of the backup bandwidth change broken line corresponding to the overlapping time period at the analysis moment is the derivative of the line segment whose horizontal coordinate is the analysis moment of the backup bandwidth change broken line corresponding to the overlapping time period, and the derivative value of the instant receiving bandwidth floating broken line corresponding to the overlapping time period at the analysis moment is the derivative of the line segment whose horizontal coordinate is the analysis moment of the instant receiving bandwidth floating broken line corresponding to the overlapping time period), and divide the derivative value of the backup bandwidth change broken line corresponding to the overlapping time period at the analysis moment by the derivative value of the instant receiving bandwidth floating broken line corresponding to the overlapping time period at the analysis moment to obtain the amount as the derivative ratio at the analysis moment, divide the amount obtained by accumulating the derivative ratios at all the analysis moments by the number of analysis moments to obtain the corresponding average, and the corresponding average is the derivative ratio in the overlapping time period; The derivative ratios of all overlapping time periods are accumulated, and the amount obtained by dividing the accumulated amount by the number of overlapping time periods is the mean derivative ratio. The amount obtained by subtracting the mean derivative ratio from the derivative ratio is defined as , It is the derivative ratio offset. All the derivative ratio offsets are accumulated. The accumulated amount divided by the number of derivative ratio offsets is the average derivative ratio offset. Compare the derivative ratio offset and the derivative ratio offset mean: If the derivative ratio offset is higher than the derivative ratio offset mean, the overlapping time period corresponding to the derivative ratio offset (the overlapping time period corresponding to the derivative ratio offset is the overlapping time period corresponding to the derivative ratio corresponding to the derivative ratio offset) is defined as an abnormal overlapping time period; If the derivative ratio offset is not higher than the derivative ratio offset mean, the overlapping time period corresponding to the derivative ratio offset is defined as a reasonable overlapping time period; The number of reasonable overlapping time periods in the total overlapping time periods is calculated, and the number of reasonable overlapping time periods divided by the number of overlapping time periods is used as the overlap ratio of the change range. ; Overlap time ratio Overlap ratio with change range Perform the treatment via the equation: Operation to determine the amount of coordination , here, and are all ratio factors predefined according to specific requirements, and and All are above zero; Determine the amount of coordination Compared with the pre-defined decision coordination threshold execution according to specific requirements: If the decision on the amount of coordination If it is higher than the decision coordination threshold, it means that the voltage value receiving bandwidth is the determining factor of the voltage value backup bandwidth; If the decision on the amount of coordination If it is not higher than the critical value of the decision coordination, it means that the voltage value receiving bandwidth is not the determining factor of the voltage value backup bandwidth, and other determining factors need to be further analyzed. Other determining factors may be hard disk aging or the amount of information received by the industrial computer from the outside world. The voltage value receiving bandwidth is the receiving bandwidth of the industrial computer receiving the input voltage value of the air compressor motor.

[0035] Step 3, if the receiving bandwidth is a factor that determines the voltage value backup bandwidth, the receiving bandwidth adjustment amount is obtained, and the current voltage value receiving bandwidth is adjusted according to the receiving bandwidth adjustment amount.

[0036] In a preferred but non-limiting embodiment of the present invention, in Step 3, the backup bandwidth value at the current moment is obtained, and the amount obtained by subtracting the backup bandwidth basic amount from the backup bandwidth value is used as the backup bandwidth adjustment amount, and the amount obtained by dividing the backup bandwidth adjustment amount by the mean of the derivative ratio is used as the receiving bandwidth adjustment amount; The voltage value receiving bandwidth of the industrial computer at the current moment is adjusted according to the receiving bandwidth adjustment amount. The receiving bandwidth adjustment amount adjusts the voltage value receiving bandwidth of the industrial computer at the current moment, that is, the amount obtained by adding the receiving bandwidth adjustment amount to the voltage value instant receiving bandwidth value basic amount is regarded as the voltage value receiving bandwidth of the industrial computer at the current moment.

[0037] like Figure 2 As shown, the present invention discloses a frequency converter harmonic control device for large-capacity compressed air energy storage, comprising: A resonance voltage suppression circuit is connected between the frequency converter used for large-capacity compressed air energy storage and the motor of the air compressor (the resonance voltage suppression circuit includes a reactor and a damping circuit connected in parallel, one end of the reactor is connected to the output end of the frequency converter used for large-capacity compressed air energy storage, and the other end of the reactor is connected in sequence to a cable and the motor of the air compressor), so as to suppress the resonance voltage of the motor of the air compressor when driven by the frequency converter used for large-capacity compressed air energy storage, so that the frequency converter used for large-capacity compressed air energy storage can more effectively adjust the speed of the motor of the air compressor; It also includes: a voltage sensor and an industrial computer connected thereto, wherein the voltage sensor is used to collect the input voltage value of the motor of the air compressor and transmit it to the display screen of the industrial computer for display and to the hard disk of the industrial computer for backup, so as to facilitate the subsequent checking of the harmonic condition of the input voltage of the motor of the air compressor; Industrial computers also include: The identification module 1 is used to obtain the backup information of the industrial computer in real time during the input voltage value of the motor of the backup air compressor, until it is determined how to form the backup message when the input voltage value of the motor of the backup air compressor is determined; The second identification module is used to obtain the corresponding backup bandwidth floating time period when the backup abnormality message is generated according to the backup abnormality message, until it is determined whether the voltage value receiving bandwidth is a factor that determines the voltage value backup bandwidth; The adjustment module is used to obtain a reception bandwidth adjustment amount if the reception bandwidth is a factor determining the voltage value backup bandwidth, and to adjust the current voltage value reception bandwidth according to the reception bandwidth adjustment amount.

[0038] The beneficial effects of the present invention are that, compared with the prior art, the technical effects of the present invention include: Perform analysis based on the backup bandwidth value to obtain the voltage value backup presentation amount , according to the backup presentation volume , determine how to generate backup information when the input voltage value of the motor of the backup air compressor is determined, the present invention monitors the backup bandwidth in real time and calculates the backup presentation quantity according to the voltage value calculated by the backup bandwidth The backup status can be flexibly estimated, so that hidden problems during the backup period can be immediately detected, and the reliability of the voltage value backup can be improved; the present invention obtains the corresponding backup bandwidth floating time period when the backup abnormality message is formed according to the backup abnormality message, and obtains the voltage value corresponding to the backup time instant receiving bandwidth value, and obtains the decision coordination amount according to the voltage value instant receiving bandwidth value and the backup bandwidth floating time period analysis. , based on the decision of the amount of coordination Determine whether the voltage value receiving bandwidth is a factor that determines the voltage value backup bandwidth. If the receiving bandwidth is a factor that determines the voltage value backup bandwidth, adjust the current receiving bandwidth according to the receiving bandwidth adjustment amount. The present invention analyzes the changes in the receiving bandwidth during the input voltage value transmission period in detail through the floating of the backup bandwidth. Through overlapping analysis, it is determined whether the voltage value receiving bandwidth is a factor that causes the abnormal voltage value backup bandwidth. This is suitable for improving the function of backing up the input voltage value of the motor of the air compressor and improving the reliability of the input voltage value backup of the motor of the air compressor.

[0039] In addition, one end of the reactor can also be connected to the input end of a frequency converter used for large-capacity compressed air energy storage.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not deviate from the spirit and scope of the present invention should be covered within the protection space of the claims of the present invention.

Claims

1. A frequency converter harmonic control method applied to large-capacity compressed air energy storage, characterized in that: include: A resonance voltage suppression circuit connected between a frequency converter applied to large-capacity compressed air energy storage and a motor of an air compressor is used to suppress the resonance voltage of the motor of the air compressor when driven by the frequency converter applied to large-capacity compressed air energy storage; The voltage sensor collects the input voltage value of the motor of the air compressor and transmits it to the display screen of the industrial computer for display and to the hard disk of the industrial computer for backup; The voltage sensor collects the input voltage value of the air compressor motor and transmits it to the hard disk of the industrial computer for backup, which also includes: Step 1, during the period of backing up the input voltage value of the motor of the air compressor, the backup information of the industrial computer is obtained in real time until it is determined how to form the backup information when the input voltage value of the motor of the air compressor is backed up; Step 2, according to the backup abnormality message, obtain the corresponding backup bandwidth floating time period when the backup abnormality message is generated, until it is determined whether the voltage value receiving bandwidth is the factor that determines the voltage value backup bandwidth; Step 3, if the receiving bandwidth is a factor that determines the voltage value backup bandwidth, the receiving bandwidth adjustment amount is obtained, and the current voltage value receiving bandwidth is adjusted according to the receiving bandwidth adjustment amount.

2. The inverter harmonic control method for large-capacity compressed air energy storage according to claim 1 is characterized in that: In Step 1, the backup information includes the backup bandwidth value, and the backup bandwidth value is analyzed to obtain the voltage value backup presentation amount. , according to the backup presentation volume , determine how to generate backup information when the input voltage value of the motor of the backup air compressor is high, and the backup information includes backup reasonable information and backup abnormal information.

3. The inverter harmonic control method for large-capacity compressed air energy storage according to claim 2 is characterized in that: In Step 1, during the input voltage value period of the motor of the backup air compressor, the input voltage value period of the motor of the backup air compressor is cut by a number of backup moments, the backup moment is regarded as the horizontal axis value of the rectangular coordinate system, the backup bandwidth value corresponding to the backup moment is regarded as the vertical axis value of the rectangular coordinate system, and the rectangular coordinate system is constructed in this way. The backup bandwidth value corresponding to the backup moment is marked in the rectangular coordinate system to form a marking point, and then two adjacent marking points are connected by straight lines to obtain the backup bandwidth change polyline; The backup bandwidth basic quantity is marked on the vertical axis of the rectangular coordinate system to obtain the backup bandwidth origin point, and a horizontal line is drawn through the backup bandwidth origin point to define it as the backup bandwidth origin line.

4. The inverter harmonic control method for large-capacity compressed air energy storage according to claim 3 is characterized in that: In Step 1, the section where the backup bandwidth variation polyline overlaps with the backup bandwidth original line is defined as the backup bandwidth overlapping line, the section within the backup bandwidth variation polyline that is above the backup bandwidth original line is defined as the backup bandwidth upper floating polyline, and the section within the backup bandwidth variation polyline that is below the backup bandwidth original line is defined as the backup bandwidth lower floating polyline. The number of backup bandwidth upper floating polylines and the number of backup bandwidth lower floating polylines are summed up, and the sum of the number of backup bandwidth upper floating polylines and the number of backup bandwidth lower floating polylines is taken as the number of backup bandwidth floating polylines, and the amount obtained by dividing the number of backup bandwidth floating polylines by the number of all polyline segments during the input voltage value of the motor of the backup air compressor is taken as the backup bandwidth floating polyline number ratio. ; The integral between the upper floating polyline of the backup bandwidth and the original line of the backup bandwidth is obtained, and the integral between the upper floating polyline of the backup bandwidth and the original line of the backup bandwidth is used as the upper floating integral of the backup bandwidth. The integral between the lower floating polyline of the backup bandwidth and the original line of the backup bandwidth is obtained, and the integral between the lower floating polyline of the backup bandwidth and the original line of the backup bandwidth is used as the lower floating integral of the backup bandwidth. The upper floating integral of the backup bandwidth is added to the lower floating integral of the backup bandwidth, and the amount obtained by adding the upper floating integral of the backup bandwidth is used as the floating integral of the backup bandwidth. The amount obtained by dividing the floating integral of the backup bandwidth by the critical value of the floating integral of the backup bandwidth defined in advance is used as the floating integral ratio of the backup bandwidth. .

5. The inverter harmonic control method for large-capacity compressed air energy storage according to claim 4 is characterized in that: In Step 1, the number of backup bandwidth floating curves is Floating credit ratio of backup bandwidth The treatment is performed, that is, through the equation: Calculate the backup data , here, , are all predefined ratio factors, and , All are above zero; Back up the volume Compare with the pre-defined backup threshold execution: If the backup presents the amount If the backup value is lower than the critical value, a backup abnormality message will be generated; If the backup presents the amount If the backup value is not less than the critical value, a backup validity message is generated.

6. The inverter harmonic control method for large-capacity compressed air energy storage according to claim 5 is characterized in that: In Step 2, the backup bandwidth floating time period includes the backup bandwidth upper floating time period and the backup bandwidth lower floating time period. The voltage value corresponding to the backup time is obtained to instantly receive the bandwidth value. The overlapping time interval ratio is obtained based on the voltage value instant receiving bandwidth value and the backup bandwidth floating time period. Overlap ratio with change range , based on the overlap time ratio Overlap ratio with change range Execute analysis to obtain the decision coordination amount , based on the decision of the amount of coordination Determine whether the voltage value receiving bandwidth is a factor in determining the voltage value backup bandwidth.

7. The inverter harmonic control method for large-capacity compressed air energy storage according to claim 6 is characterized in that: In Step 2, the backup time is regarded as the horizontal axis value of the rectangular coordinate system, and the receiving information corresponding to the backup time is regarded as the vertical axis value of the rectangular coordinate system, so as to construct the rectangular coordinate system. Here, the receiving information includes the voltage value and the instant receiving bandwidth value, and the voltage value and the instant receiving bandwidth value corresponding to the backup time are obtained. The voltage value and the instant receiving bandwidth value corresponding to the backup time are marked in the rectangular coordinate system to form marking points, and the adjacent marking points are connected with straight lines to obtain the floating polyline of the instant receiving bandwidth; The voltage value, which is the basic quantity of the instantaneous receiving bandwidth value, is regarded as the primitive value and marked on the vertical axis of the rectangular coordinate system. A horizontal line is drawn through the primitive value and defined as the receiving bandwidth primitive line.

8. The inverter harmonic control method for large-capacity compressed air energy storage according to claim 7 is characterized in that: In Step 2, the section of the receiving bandwidth variation line above the receiving bandwidth primitive line is defined as the receiving bandwidth upper floating line, the section of the receiving bandwidth variation line below the receiving bandwidth primitive line is defined as the receiving bandwidth lower floating line, the time period corresponding to the receiving bandwidth upper floating line is obtained and defined as the receiving bandwidth upper floating time period, the time period corresponding to the receiving bandwidth lower floating line is obtained and defined as the receiving bandwidth lower floating time period; According to the backup abnormality message, the corresponding backup bandwidth upper floating time period and backup bandwidth lower floating time period when the backup abnormality message is generated are obtained; In Step 2, the overlapping time period between the upper floating time period of the receiving bandwidth and the upper floating time period of the backup bandwidth is defined as the upper overlapping time period, and the overlapping time period between the lower floating time period of the receiving bandwidth and the lower floating time period of the backup bandwidth is defined as the lower overlapping time period; The upper overlapping time period and the lower overlapping time period are both regarded as overlapping time periods, and the time interval corresponding to the overlapping time period is defined as the overlapping time interval; The overlap time ratio is obtained by dividing the overlap time by the total time corresponding to the input voltage value of the backup air compressor motor. ; Select several moments in the overlapping time period as analysis moments, obtain derivative values ​​of the backup bandwidth change line and the instant receiving bandwidth floating line corresponding to the overlapping time period at the analysis moments respectively, and divide the derivative value of the backup bandwidth change line corresponding to the overlapping time period at the analysis moment by the derivative value of the instant receiving bandwidth floating line corresponding to the overlapping time period at the analysis moment to obtain the derivative ratio at the analysis moment, divide the accumulated derivative ratios at all analysis moments by the number of analysis moments to obtain the corresponding average, and the corresponding average is the derivative ratio in the overlapping time period; The derivative ratios of all overlapping time periods are accumulated, and the amount obtained by dividing the accumulated amount by the number of overlapping time periods is the mean derivative ratio. The amount obtained by subtracting the mean derivative ratio from the derivative ratio is defined as , It is the derivative ratio offset. All the derivative ratio offsets are accumulated. The accumulated amount divided by the number of derivative ratio offsets is the average derivative ratio offset. Compare the derivative ratio offset and the derivative ratio offset mean: If the derivative ratio offset is higher than the derivative ratio offset mean, the corresponding overlapping time period of the derivative ratio offset is defined as an abnormal overlapping time period; If the derivative ratio offset is not higher than the derivative ratio offset mean, the overlapping time period corresponding to the derivative ratio offset is defined as a reasonable overlapping time period; The number of reasonable overlapping time periods in the total overlapping time periods is calculated, and the number of reasonable overlapping time periods divided by the number of overlapping time periods is used as the overlap ratio of the change range. ; Overlap time ratio Overlap ratio with change range Perform the treatment via the equation: Operation to determine the amount of coordination , here, and are all predefined ratio factors, and and All are above zero; Determine the amount of coordination Compare this to the pre-defined decision coordination threshold execution: If the decision is made on the amount of coordination If it is higher than the decision coordination threshold, it means that the voltage value receiving bandwidth is the determining factor of the voltage value backup bandwidth; If the decision is made on the amount of coordination If it is not higher than the decision coordination critical value, it means that the voltage value receiving bandwidth is not the determining factor of the voltage value backup bandwidth.

9. The inverter harmonic control method for large-capacity compressed air energy storage according to claim 8, characterized in that: In Step 3, the backup bandwidth value at the current moment is obtained, and the amount obtained by subtracting the backup bandwidth basic amount from the backup bandwidth value is used as the backup bandwidth adjustment amount, and the amount obtained by dividing the backup bandwidth adjustment amount by the mean of the derivative ratio is used as the receiving bandwidth adjustment amount; The voltage value receiving bandwidth of the industrial computer at the current moment is adjusted according to the receiving bandwidth adjustment amount.

10. A frequency converter harmonic control device applied to large-capacity compressed air energy storage, characterized in that: include: A resonant voltage suppression circuit is connected between the frequency converter used for large-capacity compressed air energy storage and the motor of the air compressor; It also includes: a voltage sensor and an industrial computer connected thereto, wherein the voltage sensor is used to collect the input voltage value of the motor of the air compressor and transmit it to the display screen of the industrial computer for display and to the hard disk of the industrial computer for backup; Industrial computers also include: The identification module 1 is used to obtain the backup information of the industrial computer in real time during the input voltage value of the motor of the backup air compressor, until it is determined how to form the backup message when the input voltage value of the motor of the backup air compressor is determined; The second identification module is used to obtain the corresponding backup bandwidth floating time period when the backup abnormality message is generated according to the backup abnormality message, until it is determined whether the voltage value receiving bandwidth is a factor that determines the voltage value backup bandwidth; The adjustment module is used to obtain a reception bandwidth adjustment amount if the reception bandwidth is a factor determining the voltage value backup bandwidth, and to adjust the current voltage value reception bandwidth according to the reception bandwidth adjustment amount.

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