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非线性负载的大量应用给电网带来了严重的谐波污染，并由此产生了一系列电能质量问题，而各种敏感负载对电网的供电质量又提出了更高的要求。无源电力滤波器因其结构简单、设备投资少、运行可靠性高、运行费用低，成为电力系统中最普遍的谐波抑制设备。本论文对主电路串联电抗器的无源电力滤波器的参数设计方法进行了研究。对无源滤波装置的实际运行情况进行分析，在装置的可靠性方面进行了若干改进的措施。这些措施提高了无源滤波器运行的可靠性，可以避免某些潜在的危险，提高了晶闸管的使用寿命。在实际应用过程中发现只在主电路串联电抗器时，其电压电流畸变率均有减少。如果将负载看作是谐波电流源，这种现象是无法解释的。因此通常在无源滤波器设计中采用的电流源模型是不准确的。因此有必要找到一种更加准确的谐波源模型。7987
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通过模型的计算与仿真结果和实验波形的对比验证，说明了此种模型在滤波器设计方面的有效性。
关键词：谐波抑制，无源滤波器设计，谐波源模型， matlab 仿真
Title I mproved Method of the power system of the passive
filter
Abstract Abstract Abstract Abstract
Wide-range application of nonlinear load has brought serious harmonic pollution
to power grid, as well as a series of power quality problems. However , some sensitive
load has tougher and tougher requirement on power quality .Therefore, passive power
filer(PPF)is most widely used as harmonic-eliminating device in powe r
system ,because of simple configuration, low investment ,high reliability ,and low
operation cost .The parameter design of PPF with series reactor in source branch is
researched in this paper.
Through analyzing the operation of the passive power filter, a number of measures
have been carried out to improve the reliability of the device .These measures improve
the reliability of the passive filter and eliminate some potential risks. The life length of
the SCR can be improved.
In the course of practical application, the system that only series reactor in the
source branch, its voltage and current distortion rate has decreased. If the load is
regarded as a harmonic current source, this phenomenon is impossible to explain. So
the current source model which is often used in the passive filter design is not accurate.
Therefore, it is necessary to find a more accurate model of the harmonic source.
Through compositing the model numeration with simulation result and the actual
w aveforms ,the effectvity of the model in filter design is verified.
Keywords : harmonic suppression , design of passive power filter, the model of
harmonic source, matlab simulation目次
1 绪论 . 1
1.1 本课题的研究目的及意义 1
1.2 电力系统无源滤波器的国内外研究现状及趋势 . 2
1.3 无源滤波器的应用现状及存在的问题 . 3
1.4 本文主要工作 . 4
1.5 本章小结 . 4
2 无源电力滤波器基础理论 4
2.1 无源滤波器基本原理 4
2.2 单调谐滤波器 . 5
2.3 高通滤波器 . 9
2.4 系统等值谐波阻抗对滤波器参数的影响研究 . 13
2.5 本章小结 . 16
3 无源滤波器工程设计方法 16
3.1 引言 . 16
3.2 无源滤波器的一般性设计原则 16
3.3 设计滤波装置的原始数据 17
3.4 滤波装置设计方案的确定 18
3.5 单调谐滤波器设计方法 19
3.6 高通滤波器的设计方法 29
3.7 本章小结 . 31
4 无源滤波器的改进与仿真 31
4.1 传统无源滤波器的原理分析 31
4.2 基于 Matlab/Simulink 的无源滤波器的改进与分析 33