中山大学学报（自然科学版）Issue(4)：40-44,5.
基于 FFT 与小波变换结合的嵌入式电能质量检测系统
The Embedded System for Power Quality Detection Based on FFT and Wavelet Theory
摘要
Abstract
The advantages of FFT application in frequency domain and wavelet theory in time domain were studied , and an Embedded System for Power Quality Detection ( ESPQD ) based on radix-4 FFT and Wavelet Transform is developed .The ESPQD uses the wavelet theory to monitor the transient power qualityincluding voltage dip , voltage swell and so on .FFT is applied to analysis harmonics of electrical signals in steady-state.Three different states including steady-state, voltage dip and transient interference were tested with both the ESPQD hardware system and Matlab simulation for verification .The results show that the amplitude error of fundamental wave is within 0.3%, meeting the A level standard of the u-tility grid standards GB/T 14549-93 about harmonic measuring instruments .The system can also pre-cisely and quickly detect the abrupt changes of the electrical signals during voltage dip and transient in -terference .The time difference between ESPQD and simulation is within 1.6 ms and the system can be used in real time measurement .关键词
FFT/小波变换/电能质量Key words
FFT/wavelet transform/power quality分类
信息技术与安全科学引用本文复制引用
沈海滨,郑寿森,祁新梅..基于 FFT 与小波变换结合的嵌入式电能质量检测系统[J].中山大学学报（自然科学版）,2014,(4):40-44,5.基金项目
广东省自然科学基金资助项目 （）
