快速傅里叶变换在交直流漏电识别中的应用研究  

Research and Application of Fast Fourier Transform in AC/DC Leakage Identification

作　　者：李彤 尹志宏[1] 张文斌[1] LI Tong;YIN Zhi-hong;ZHANG Wen-bin(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学机电工程学院,云南昆明650500

出　　处：《软件导刊》2021年第10期202-206,共5页Software Guide

基　　金：云南电网有限责任公司科技项目(1026HC2010062)。

摘　　要：为解决传统交直流漏电电流识别方法无法应用于单片机的问题,提出一种基于快速傅里叶变换的交直流漏电电流识别方法。首先,通过实验建立漏电电流的频谱特征库,采用磁通门交直流互感器检测交直流漏电电流信号;使用STM32单片机对信号进行快速傅里叶变换获得频谱,再将信号频谱与特征库匹配,从而确定漏电电流波形。实验结果表明,该方法能够使用STM32单片机对国标规定的11种漏电电流波形进行识别,正确率达到95%,可满足漏电保护开关的要求。In order to solve the shortcomings of traditional AC/DC leakage current identification method that cannot be applied to single chip microcomputer,an AC/DC leakage current identification method based on fast Fourier transform is proposed.Firstly,the spectrum characteristic library of leakage current is established by experiment,and the leakage current signal is detected by flux-gate AC/DC transformer;The STM32 single chip microcomputer is used to obtain the spectrum of the signal by fast Fourier transform,and then the spectrum of the signal is matched with the feature library to determine the waveform of the leakage current.The experimental results show that the recognition method can identify the waveform of 11 kinds of leakage current specified in the national standard by STM32 single chip microcomputer,the correct rate reaches 95%,which meets the requirement of leakage protection switch.

关 键 词：交直流漏电 电流波形识别 快速傅里叶变换 STM32单片机 磁通门交直流互感器 

分 类 号：TP319[自动化与计算机技术—计算机软件与理论]