CN-122026694-A - Inverter narrow pulse compensation method, system, equipment and storage medium

CN122026694ACN 122026694 ACN122026694 ACN 122026694ACN-122026694-A

Abstract

The invention discloses a narrow pulse compensation method, a system, equipment and a storage medium of an inverter, which relate to the technical field of power electronics and inverter control and comprise the steps of collecting narrow pulse multi-source data through an acquisition part, inputting the narrow pulse multi-source data into a fitting part and outputting a blocking pulse feature set; the method comprises the steps of inputting a blocking pulse characteristic set into a calculating part, outputting the times and the distribution mode of compensation pulses and storing the times and the distribution mode of the compensation pulses into the compensating part, wherein the blocking pulse characteristic set is obtained through self-adaptive polynomial fitting of blocking narrow pulse envelopes, the times of the compensation pulses are obtained through pulse width and a preset threshold value, the output distribution mode is obtained through envelopes and least squares, and the times and the distribution mode of the compensation pulses stored in the compensating part are overlapped and executed at the same position in the next period. The method of the invention has better effects on the integrity of the blocking pulse characterization, the calculability of the compensation times and the distribution mode and the periodical consistency of the compensation execution.

Inventors

YU PUDE
CHEN CHENG
Qiao Weizhuo
ZHOU MIN
CHEN JIANNING
XU WENXUAN
SHAO YICHEN
TIAN ANMIN
SHI XINYI
Wo Renfei
Zhao Yingjiang

Assignees

南京南瑞新能源科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (10)

1. A method for inverter narrow pulse compensation, comprising: collecting narrow pulse multi-source data through an collecting part (100), inputting the narrow pulse multi-source data into a fitting part (200) and outputting a blocking pulse characteristic set; Inputting the lockout pulse feature set into a calculating unit (300), outputting the number of times and the distribution pattern of the compensation pulse and storing the number of times and the distribution pattern in a compensating unit (400), The blocking pulse feature set is obtained through self-adaptive polynomial fitting of blocking narrow pulse envelopes; the number of the compensation pulses is obtained through pulse width and a preset threshold value; The output distribution mode is obtained through envelope and least square; the number of compensation pulses stored in the compensation unit (400) is superimposed on the same position in the next cycle as the distribution pattern.
2. The inverter narrow pulse compensation method according to claim 1, wherein the acquisition of narrow pulse multi-source data by the acquisition section (100) comprises, Calculating the power grid frequency and the set switching frequency through phase locking, and calculating the number of switching pulses in a power frequency period; And counting the starting positions and the quantity of the narrow pulses to be blocked and the narrow pulse width of each blocking in the current power frequency period in real time.
3. The method for inverter narrow pulse compensation according to claim 1 or 2, wherein the set of blocked pulse features is obtained by an adaptive polynomial fit of a blocked narrow pulse envelope comprising, Fitting an envelope curve of the blocked narrow pulse; adopting a self-adaptive polynomial fitting mode, wherein the polynomial order is the number of the blocking pulses minus 1; calculating an envelope trend by using the positions and the amplitudes at different moments; taking the envelope trend as the integral distribution characteristic of the blocking pulse; The lockout pulse feature set includes lockout pulse global distribution features and lockout pulse cumulative widths.
4. The method for inverter narrow pulse compensation according to claim 3, wherein calculating the lockout pulse accumulation width comprises, The narrow pulse occurs at zero crossing of the duty cycle, each blocked pulse being continuous; Accumulating the blocking pulse width stored each time, and calculating the total lost pulse width; the total missing pulse width is taken as the lockout pulse cumulative width.
5. The method for compensating for narrow pulses of an inverter according to claim 1,2 or 4, wherein the number of compensating pulses is obtained by a pulse width, a preset threshold value, Setting a preset threshold value to be 2 mu s; based on the obtained lockout pulse accumulation width, rounding down the ratio of the lockout pulse accumulation width to a preset threshold; the maximum value of the decomposition count of the total compensation pulse is obtained.
6. The method for inverter narrow pulse compensation according to claim 5, wherein said output distribution pattern is obtained by envelope and least square, Determining the number of compensation pulses; The ratio of the cumulative width of the blocking pulse to the number of compensation pulses is rounded upwards to obtain the minimum width value of each pulse compensation; and ensures that the minimum width of the pulse compensation is greater than a preset threshold.
7. The inverter narrow pulse compensation method of claim 1,2, 4 or 6, wherein the performing of superposition at the same location in the next cycle comprises, Delaying the calculated compensation duty ratio by one power frequency period, and performing superposition compensation at the same position in the next period.
8. An inverter narrow pulse compensation system adopting the inverter narrow pulse compensation method according to any one of claims 1-7 is characterized by comprising an acquisition module, a fitting module, a calculation module and a compensation module; The acquisition module acquires narrow pulse multi-source data through an acquisition part (100); The fitting module comprises a fitting part (200), wherein the fitting part (200) is connected with the acquisition part (100) and is used for identifying the blocked narrow pulse in the narrow pulse multi-source data, storing information corresponding to the blocked narrow pulse, performing self-adaptive polynomial fitting on the blocked narrow pulse envelope and outputting a blocked pulse feature set; the calculation module comprises a calculation part (300), the calculation part (300) is connected with the fitting part (200), the number of times of compensation pulses is determined according to the pulse width in the blocking pulse characteristic set and a preset threshold value, and the distribution mode of the compensation pulses is determined according to the envelope and the least square; The compensation module comprises a compensation part (400), wherein the compensation part (400) is connected with the calculation part (300) and is used for saving the times and the distribution mode of compensation pulses and performing superposition execution at the same position in the next period.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the inverter narrow pulse compensation method of any one of claims 1-7 when executing the computer program.
10. A computer readable storage medium having stored thereon a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the inverter narrow pulse compensation method of any of claims 1 to 7.

Description

Inverter narrow pulse compensation method, system, equipment and storage medium Technical Field The invention relates to the technical field of power electronics and inverter control, in particular to an inverter narrow pulse compensation method, an inverter narrow pulse compensation system, an inverter narrow pulse compensation device and a storage medium. Background The prior art generally uses clipping or widening to a minimum pulse width for an excessively narrow pulse when the narrow pulse is not compensated. Less recent studies on the problem of narrow pulses have reported that the processing of narrow pulses is generally addressed in conjunction with specific PWM methods: In the prior art, SVPWM of a three-level inverter is researched, and a non-nearest three-vector N2TV method and a non-nearest four-vector N2TV method which are different from a traditional three-level inverter SVPWM control method-a nearest three-vector NTV method are provided for solving the problem of narrow pulse, but the problem of larger harmonic wave is also solved. A new SVPWM implementation scheme is provided by considering the problem of narrow pulse and reducing the switching frequency, the method subdivides a 60-degree large triangle area into 14 small areas with different shapes, and the vector action sequence of each cell is researched; the number of the district divisions is too large, and when the microcomputer carries out space voltage vector control and judges the vector position, the operation amount is large, time and labor are wasted, and the method is not practical. In addition, other existing methods adopt a method with reverse voltage vector output sequence, and combine a three-level SVPWM method, and aiming at the narrow pulse problem and the midpoint potential fluctuation problem, respective vector action schemes are provided for 4 different triangular areas in a 60-degree interval, and the method cannot eradicate the narrow pulse and can only cut the narrow pulse into half. The three-level SVPWM control method adopts an NTV rule, considers the problem of narrow pulse, controls the fluctuation of the neutral point potential and reduces the switching frequency, and the research result is unsatisfactory. Disclosure of Invention The present invention has been made in view of the above-described problems. The invention solves the technical problems that the traditional processing mode adopts a direct blocking mode, thus leading to the distortion of the output duty ratio at the zero crossing position, increasing the distortion rate of the output voltage and the current, and the duty ratio is released based on the blocking threshold value in equal proportion by calculating the blocking total amount of the narrow pulse, and the equivalent compensation output of the duty ratio is generally ensured at the zero crossing position by utilizing the PWM equivalent principle, thereby ensuring the electric energy quality of the output voltage and the current. In order to solve the technical problems, the invention provides the technical scheme that the narrow pulse compensation method of the inverter comprises the steps of collecting narrow pulse multi-source data through an acquisition part, inputting the narrow pulse multi-source data into a fitting part and outputting a blocking pulse feature set. The lockout pulse feature set is input into the calculation unit, and the number of times and the distribution pattern of the compensation pulse are output and stored in the compensation unit. Wherein the blocked pulse feature set is obtained by adaptive polynomial fitting of the blocked narrow pulse envelope. The number of compensation pulses is obtained by pulse width and preset threshold value. The output distribution mode is obtained through envelope and least square. The number of compensation pulses stored in the compensation unit is superimposed on the same position in the next cycle as the distribution pattern. The method for compensating the narrow pulse of the inverter comprises the steps of acquiring narrow pulse multi-source data through an acquisition part, calculating the power grid frequency and the set switching frequency through phase locking, and calculating the number of switching pulses in a power frequency period. And counting the starting position and the quantity of the narrow pulse to be blocked and the narrow pulse width to be blocked each time in the current power frequency period in real time. The method for compensating the narrow pulse of the inverter comprises the following steps of obtaining an envelope curve of the blocked narrow pulse by adaptive polynomial fitting of the envelope of the blocked narrow pulse. And adopting a self-adaptive polynomial fitting mode, wherein the polynomial order is the number of the blocking pulses minus 1. And calculating the envelope trend by using the positions and the amplitude values at different moments. The envelope trend is taken as the overall distribution c