摘要：随着科学技术的进步，各种新型的用电设备在社会的各个领域得广泛的使用，用电设备运行所要求的高安全性和精确性，对电能的使用和需求产生了更高的要求，但非线性负荷大量使用却带来了严重的电力谐波污染，给系统安全、稳定、高效运行和供用电设备造成严重影响及危害。如何能把谐波的危害最大限度地减少是目前电力系统领域极为关注的问题，而解决这一问题的关键在于定量地确定谐波的成分、幅值和相位等。提高电网谐波监测分析水平，对于抑制高次谐波含量是十分必要和有价值的。78959

本文介绍了电力系统谐波的基本概念、危害及常见的几种谐波检测算法及其不足,介绍了基于瞬时无功功率理论检测法，同时进行仿真验证,还就谐波检测系统的软硬件进行了设计。为了能满足实时谐波分析算法运算量大的需求，硬件上采用了DSP+ARM的设计方法，这种方法可以充分发挥DSP芯片的数字信号处理功能和ARM的控制功能，以实现系统中的复杂软件算法，运算速度也能得以提高。系统的软件部分分为两部分，一是DSP的程序设计，包括数据采集、处理数据等；二是ARM，包括人机接口、远程通讯等子程序。

毕业论文关键词：电力系统，谐波检测，小波变换，傅立叶变换 

Abstract: With the progress of science and technology, all kinds of new electrical equipment in all areas of society are widely used, due to equipment operation requirements of high security and accurate, the use and demand for electrical energy produced higher requirements, but the extensive use of non-linear load has brought about severe power harmonics pollution, causing serious influence and harm to the system safe, stable and high efficient operation and power supply equipment。 How to reduce the harm of harmonics to the maximum extent is the most concerned problem in the current power system, and the key to solve this problem is to quantitatively determine the components, amplitude and phase of harmonics。 It is very necessary and valuable to improve the level of harmonic monitoring and analysis of power network。

This paper introduces the basic concept of power system harmonic, harmonic harm and common harmonic detection algorithm and its shortcomings, and puts forward the algorithm of wavelet transform and Fourier transform。 The software and hardware of the harmonic detection system are designed。 In order to meet the real-time harmonic analysis algorithm for computing a large quantity of demand, hardware adopts the design method of DSP + ARM。 This method can give full play to the DSP chip of digital signal processing and the control ability of arm, in order to achieve complex software algorithm in system, computing speed can also can be improved。 The software part of the system is pided into two parts, the DSP program design, including data acquisition, data processing and so on; two is the ARM, including man-machine interface, remote communication, etc。

Key words: power system,harmonic detection, Fourier Transform, Wavelet Transform

目 录 

1 绪论 3

1。1 课题研究背景及意义 3

1。2 国内外研究现状及动态 3

1。3 谐波的基本概念 4

1。4 谐波的检测指标 5

1。5 论文结构 5

2 常用谐波检测方法研究 5

2。1 采用模拟带通(或带阻)滤波器测量谐波 5

2。2 基于傅立叶变换的谐波检测与分析