基于加窗FFT电力系统谐波分析仪设计.doc

基于加窗FFT电力系统谐波分析仪设计 摘要 随着科学技术和国民经济的快速发展，各种工业生产对电力系统电能质量的要求越来越高。然而，现代电力电子设备和非线性负载的大量使用又造成电能污染日趋严重，电能质量成为电力部门及其用户日益关注的问题。本文对电能质量检测的有关理论进行了深入的分析研究，并在理论研究的基础上给出了电力参数测量及谐波分析的方法。 本设计根据对谐波信号的自身特点进行理论分析，研究谐波对电能计量的影响，将基于傅立叶变换的小波变换作为谐波分析的基本方法。在硬件电路实现上，着重选择了传感器滤波电路，A/D转换电路与DSP开发系统相连接对谐波信号进一步处理.利用加窗FFT算法实现对电力系统谐波信号的滤波和提取，在完成了软件和硬件部分的设计后在进行仿真实验. 关键词：电力系统谐波；电能计量；FFT；DSP Windowed FFT-based power system harmonics Analyzer ABSTRACT With the rapid development of science technology and national economy，diversekinds of industry production demand higher power quality，moreover，with the widely application of modern power quality isdeteriorated increasingly，therefore，more and more close attention is paid to power quality by bothelectric department and consumers。In this paper，the theory on power quality detectiuon is researched in great depth。On the basis of the theory，the electric parameter measurement and harmonic analysis are designed and developed。 This thesis perfomance of hamonic signal and the influence of hamonic are analysis wavelet transformation based on FFT is the basic method of harmonic analysis.In hardware circuit implementation，notice to choose sigal sensons，siganal magnify circuit and filter circuit are reasonably designed。 Then the data sampling circuit is connect with DSP develop system to process harmonic signal。Simulated examination is done after the hardware and software design。 Key words：Electric power system harmonic，electric energy measurement，FFT，DSP 目录 第1章绪论 1.1课题的背景和意义..................................... ...............1 1.2电力系统谐波研究的现状和发展...................... .................2 1.3电力系统谐波特??...................................... ..............3 1.3.1谐波产生的原因...........................................3 1.3.2谐波对电网的影响..........................................3 1.3.3谐波的检测.................................. .... ...............4 第2章电力系统谐波分析的窗函数分析介绍 2．1离散傅立叶变换的泄漏与栅栏效应................