基于STFT的电能质量谐波检测  

Harmonic Detection of Power Quality Based on STFT

作　　者：余茂全[1] 张雅洁[1] 盛海军[1] YU Maoquan;ZHANG Yajie;SHENG Haijun(School of Mechanical and Electrical Engineering,Anhui Water Conservancy Technical College,Hefei 231603,Anhui)

机构地区：[1]安徽水利水电职业技术学院机电工程学院,安徽合肥231603

出　　处：《湖南工业职业技术学院学报》2025年第1期6-10,共5页Journal of Hunan Industry Polytechnic

基　　金：2022年度安徽省高校自然科学研究项目“新型电力系统背景下智能安全带的设计”(项目编号:2022AH052284);2022年度安徽省职业与成人教育学会教育教学研究规划重点课题“电气自动化专业虚实结合实训平台建设及教学研究”(项目编号:Azcj2022029);2024年度安徽省中青年教师培养行动项目“优秀青年教师培育项目”(项目编号:YQYB2024154)。

摘　　要：针对电能质量谐波检测问题,介绍了短时傅里叶变换(STFT)以及采用STFT作为时频分析工具分析电能质量扰动的方法,在STFT中选取不同窗长的窗函数对同一电能质量谐波信号进行时频分解,分析不同窗长对检测结果的影响。仿真结果表明,相对于传统的傅里叶变换,STFT对电能质量谐波检测具有较高的准确度,选取适当的窗函数,时频分辨率也得到较大提高,有助于电能质量的治理。In view of the problem of harmonic detection of power quality,the short-time Fourier transform(STFT)and the method of using STFT as a time-frequency analysis tool to analyze power quality disturbances are introduced.In STFT,the window functions with different window lengths are selected to decompose the same power quality harmonic signal in time-frequency,and the influence of different window lengths on the detection results is analyzed.The simulation results show that compared with the traditional Fourier transform,STFT has a higher accuracy in the harmonic detection of power quality,and the time-frequency resolution is also greatly improved by selecting the appropriate window function,which is conducive to the governance of power quality.

关 键 词：短时傅里叶变换 STFT 电能质量 时频分析 

分 类 号：TM76[电气工程—电力系统及自动化]