论文标题:广元电力系统谐波检测方案研究
A Study on Harmonic Detection Motheds of the Power Supply & Transmit Electricity System in Guangyuan District
论文作者 罗辉
论文导师 吕厚余,论文学位 硕士,论文专业 电气工程
论文单位 重庆大学,点击次数 1120,论文页数 61页File Size254k
2002-03-16论文网 http://www.lw23.com/lunwen_45547/ 电网谐波,谐波检测,预测,人工神经网络,瞬时功率理论,小波变换,电磁变换
Power harmonic,harmonic detecting,prediction,artificial neural network,instantaneous reactive power,wavelet analysis,electromagnetism transform
本文对国内外应用于电力供电系统电力谐波检测的基于五种原理的检测方法进行了分析研究。简要阐述了电力系统谐波检测分析所普遍采用的傅利叶变换和快速傅利叶变换的基本理论以及与数字信号采样密切相关的均匀抽样定理、频谱混叠现象、窗函数和频谱泄漏等的基本理论。分析调查了广元供电系统的电力谐波污染现状，提出了相应的电力谐波检测方法与治理方案。论文的主要内容有：概述了电力系统产生电力谐波的主要原因，电力系统中存在的电力谐波可能给电力系统设备、其它用电设备以及其周围的通讯系统可能带来的危害，分析说明了对电力系统的谐波进行检测与治理的必要性和意义。对广元电力系统的非线性负荷进行调查分析；就该电力系统的1991、2000年度的谐波检测报告进行分析研究，简要阐述了广元电力系统的非线性负荷现状和目前该电力系统的谐波污染状况。简要阐述了电力系统谐波检测分析所普遍采用的傅利叶变换和快速傅利叶变换的基本理论，简要阐明了与数字信号采样密切相关的均匀抽样定理、频谱混叠现象、窗函数和频谱泄漏等的基本理论，同时阐述了电力系统的谐波检测与分析的相关理论基础知识。阐述了目前国内外主要应用的五种可用电力谐波检测的原理：神经网络原理、瞬时功率理论原理、小波变换原理、预测原理以及电磁变换原理同时比较了目前基于这五种原理的电力谐波检测方法，指出它们各自的适用范围及其优、缺点。针对广元电力系统接入的不同类型的非线性负荷的具体情况，将广元电力系统分成三个部分，针对每个部分的特点提出了相应的比较适宜于该部分的谐波检测方法与治理的方案。
This thesis is about studying the methods that application in the electric power supply system to detect the electric power harmonic in domestic and abroad. In this thesis, summarized the basic theories of Fourier transformation and the fast Fourier transformation that are generally adopted to detect and analyze the electric power harmonic in the electric power supply system. At the same time, summarized the even sample principle, the phenomenon of frequency mix, the window functions and the frequency leaking as so on, those are closely-related to sample from figure signal. Furthermore, we analyzed the investigating reports which were concerned the present situation of the electric power harmonic pollution in the Guangyuan district"s electric power supply system, and presented the necessity and important of detecting and eliminating the electric power harmonic in the electric power supply system. The thesis"s main contents including: Summarized the main reasons why the electric power supply system produce the electric power harmonic, and the electric power harmonic may bring what harms to electric power supply system"s equipments and the other appliances which are connected in electric power supply system or the other electronic appliances beside the electric power supply system. Analyzed and explained the necessity and important that should detect and eliminate the electric power harmonic in the electric power supply system; Investigated and analyzed the no-line loads in Guangyuan district"s electric power supply system. Analyzed and studied the situations of this electric power supply system and its examination reports that were done by Sichuan Province Electric Power Company in 1991, 2000. Summarized no-line loads and the present situations of the electric power harmonic pollution in the Guangyuan district"s electric power supply system;Explained the theories of Fourier transformation and the fast Fourier transformation those are widely adopted by majority scholars to examine and analyze the electric power harmonic in the electric power supply system. Summarized the principle of even sample, the frequency mix phenomenon, the window functions and the frequency leaking as so on, those are closely -related to the figure signal. At the same time, summarized the basic principleto examine the electric power harmonic;Compared the methods those are based on five different principles, those methods are widely adopted by some scholars to examine the electric power harmonic in the electric power supply system. As the same time, pointed out the advantages and disadvantages of each method;Gave different methods those are applied in the three different kinds of the no-line loads in the Guangyuan district"s specific electric power supply system to examine and eliminate the electric power harmonic.
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