摘要在20世纪30年代，人类第一次发现了谐波，并且陆续地发现它对电力系统能够造成非常大的危害，这个发现立即引起了世界的关注。

近年来，随着科学技术的不断发展，特别是电力电子的大力发展，愈来愈多的非线性设备在电网方面得到应用，各种整流、变频、调压装置以及家用电器等等，其生成的谐波污染也越来越严重，进而降低了电能的质量，还可能令各类型电气设备产生故障，这在很大程度上威胁到了电力系统的正常工作。因此对各类谐波分量进行准确的检测计算分析是谐波治理以及检验各种设备等相关问题得以解决的前提。对于电网谐波，其主要含有稳态谐波以及时变谐波分量。现在已有较多的算法来实现对电网谐波分量的频率、幅值以及相位等参数的检测计算；本文分别检验解析了基于傅里叶变换算法和小波变换算法在谐波分量计算时参数估计的性能，然后应用MATLAB工具对其进行简单分析检验，比较不同算法在谐波分量估计分析中的优劣并作出总结。75808

该论文有图8幅，表4个，参考文献18篇。

毕业论文关键词：傅里叶变换  小波变换  谐波检测计算

Comparison and analysis of power system harmonic component calculation method based on numerical simulation

Abstract

Recently, in the deepening of the power electronic technology development at the same time , a large number of nonlinear devices has been widely used in the power grid , such as various rectifier , inverter , pressure regulating device as well as household appliances , etc , which makes the distribution of harmonic pollution because more and more serious , resulting in a decline in the quality level of the power and various types of electrical equipment failure, greatly threats the safety。 High quality and economic operation of power system。 The accurate detection of harmonic suppression, harmonic governance and equipment inspection to solve related problems such as the basic and prerequisite。 Power grid in power system harmonic component is complex, mainly contain the steady-state harmonic component, harmonic component and time-varying harmonic component。 in order to detect calculate of different type of harmonic component parameters such as frequency, amplitude, phase, now existing detection method to calculate the more; in this paper, the algorithm based on Fourier transform, wavelet transform algorithm and an algorithm based on TLSESPRIT and wavelet transform in the analysis of harmonic component estimate characteristics are analyzed, and the algorithm with MATLAB simulation the performance of parameter estimation, of different algorithms were compared in the analysis on harmonic component estimation 。

Key Words: Fourier transform   wavelet transform   harmonic detection is calculated。

目  录

摘要Ⅰ

Abstract-Ⅱ

目录Ⅲ

图清单-Ⅳ

表清单-Ⅳ

1 绪论1

1。1课题的研究背景1

1。2电力系统谐波的来源以及危害1

1。3谐波分量检测计算分析的研究现状4

1。4本章小结-该论文的主要工作5

2基于傅里叶变换的电力系统谐波检测计算-7

2。1标傅里叶变换算法-7

2。2傅里叶变换算法谐波检测的特性-8

2。3加汉宁窗傅里叶的检测算法10

2。4仿真分析10

2。5本章总结15

3基于小波变换的电力系统谐波分析-17

3。1基于离散小波变换的谐波分析-17

3。2基于连续小波变换的谐波分析-19

3。3仿真分析23

3。4本章小结25

4总结与展望-28

参考文献30

致谢30

附录31

图清单