The Embedded System for Power Quality Detection Based on FFT and Wavelet Theory

SHEN Haibin; ZHENG Shousen; QI Xinmei

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The Embedded System for Power Quality Detection Based on FFT and Wavelet Theory

更新时间：2023-12-11

- The Embedded System for Power Quality Detection Based on FFT and Wavelet Theory
- Acta Scientiarum Naturalium Universitatis SunYatseni Vol. 53, Issue 4, Pages: 40-44(2014)
- 作者机构：
  
  中山大学电力电子及控制技术研究所,广东,珠海,519082
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2014，
  
  Published Online：25 July 2014，
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SHEN Haibin, ZHENG Shousen, QI Xinmei. The Embedded System for Power Quality Detection Based on FFT and Wavelet Theory. [J]. Acta Scientiarum Naturalium Universitatis SunYatseni 53(4):40-44(2014)
DOI：

SHEN Haibin, ZHENG Shousen, QI Xinmei. The Embedded System for Power Quality Detection Based on FFT and Wavelet Theory. [J]. Acta Scientiarum Naturalium Universitatis SunYatseni 53(4):40-44(2014) DOI：

摘要

该文研究应用FFT在频域与小波变换在时域的优势，设计搭建了基_4 FFT与Daub4小波变换结合的嵌入式电能质量检测系统。该系统利用小波变换检测电压骤升、骤降等暂态问题，使用FFT分析稳态下电信号谐波。为验证系统的实际检测能力，分别对稳态、电压骤降、电压暂态干扰三种状况进行了实时监测测试和Matlab软件分析，结果表明：该嵌入式电能质量检测系统在稳态时，检测基波幅值的误差为0.3%，满足公用电网GB/T 14549—93对谐波测量仪器的A级标准；同时，在电压骤降、电压暂态干扰状态下也能准确检测到电信号的突变时间，实际系统检测和软件仿真结果误差在1.6 ms内，满足实时性要求。

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 utility grid standards GB/T 14549-93 about harmonic measuring instruments. The system can also precisely and quickly detect the abrupt changes of the electrical signals during voltage dip and transient interference. 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

Keywords

FFTwavelet transformpower quality

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