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Method for solving phase lag caused by three-phase current sampling and filtering, electronic equipment and computer readable storage medium

A phase lag, three-phase current technology, applied in the field of frequency conversion, can solve problems such as phase lag, reduce the failure rate, enhance the reliability and effectiveness of filtering, and achieve simple and accurate effects

Active Publication Date: 2020-06-19
GUANGDONG HIWAVE TECH
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  • Abstract
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Problems solved by technology

[0009] The invention aims to solve the phase lag problem caused by three-phase current sampling and filtering

Method used

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  • Method for solving phase lag caused by three-phase current sampling and filtering, electronic equipment and computer readable storage medium
  • Method for solving phase lag caused by three-phase current sampling and filtering, electronic equipment and computer readable storage medium
  • Method for solving phase lag caused by three-phase current sampling and filtering, electronic equipment and computer readable storage medium

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Embodiment Construction

[0038] In order to solve the phase lag problem caused by three-phase current sampling and filtering, this embodiment mainly includes two parts: coordinate transformation and low-pass filtering of the collected three-phase AC signal of the frequency converter. After the signal is collected, the three-phase AC signal is digitally converted into a DC signal, and the converted DC signal is filtered through a low-pass filter in the form of a DC signal. After the filtering is completed, it is converted back into a three-phase AC signal. Since the filtering object is converted into a DC signal, the phase lag problem caused by the filtering of the AC signal is solved.

[0039] See figure 2 , the above scheme specifically includes the following steps executed in sequence:

[0040] Step S1. Through the ADC channel of the controller, sample the three-phase AC signal (can be voltage or current) of the frequency converter x A ,x B ,x C , since it is a three-phase AC signal with a phas...

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Abstract

The invention relates to a method for solving phase lag caused by three-phase current sampling and filtering, electronic equipment and a computer readable storage medium. The method comprises the following steps: A, sampling a three-phase alternating current signal of a frequency converter and storing the three-phase alternating current signal as a digital quantity alternating current signal; B, converting the digital quantity alternating-current signal into a digital quantity direct-current signal, and filtering the converted digital quantity direct-current signal through a digital low-pass filter; and C, performing inverse transformation on the filtered digital quantity direct-current signal to recover the filtered digital quantity direct-current signal into a three-phase alternating-current signal. According to the invention, the problem of phase lag when the controller filters the three-phase alternating current signal is solved, signal sampling and filtering are accurate, the service life of the frequency converter is greatly prolonged, the failure rate is greatly reduced, the software filtering algorithm is simple and accurate to realize, and the filtering reliability and effectiveness are greatly enhanced.

Description

technical field [0001] The invention relates to the field of frequency conversion, in particular to a method for solving the phase lag caused by three-phase current sampling and filtering, electronic equipment, and a computer-readable storage medium. Background technique [0002] The frequency converter is a power supply that provides voltage regulation and frequency modulation to the motor, and is mainly composed of three parts: rectification, smoothing, and inverter. During the inverter process, the switching frequency of the IGBT tube is very high, which will generate a large amount of interfering high-frequency electromagnetic waves. These high-frequency interferences will enter the entire circuit network through space radiation and power supply loops. It has a great impact, especially when collecting the drive current of the inverter. If it is not handled properly, it will cause control failure, and even cause abnormal operation of various components on the circuit boar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
CPCG01R19/2509
Inventor 王树材黎祥松柳晶津方晖
Owner GUANGDONG HIWAVE TECH
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