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

A technology of phase lag and three-phase current, which is applied in the field of frequency conversion, can solve problems such as phase lag, achieve low failure rate, accurate signal sampling and filtering, and achieve simple and accurate effects

Active Publication Date: 2022-05-03
GUANGDONG HIWAVE TECH
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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 ph...

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Abstract

The present invention relates to a method for solving the phase lag caused by three-phase current sampling and filtering, electronic equipment, and a computer-readable storage medium, wherein the method includes: step A. sampling the three-phase AC signal of the frequency converter and storing it as a digital measure the AC signal; Step B. Convert the digital AC signal into a digital DC signal, and filter the converted digital DC signal through a digital low-pass filter; Step C. Invert the filtered digital DC signal The conversion is restored to a three-phase AC signal. The invention solves the problem of phase lag when the controller filters the three-phase AC signal, the signal sampling and filtering are accurate, the service life of the frequency converter is greatly extended, the failure rate is greatly reduced, and the software filtering algorithm is simple and accurate, and the filtering reliability and effectiveness are greatly improved. strengthen.

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 Patents(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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