农村电网谐波抑制与无功补偿研究.doc

    
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农村电网谐波抑制与无功补偿研究,3万字自己原创的毕业论文,仅在本站独家出售,重复率低,推荐下载使用摘要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...
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农村电网谐波抑制与无功补偿研究

3万字
自己原创的毕业论文,仅在本站独家出售,重复率低,推荐下载使用

摘要 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。随着农村的不断进步发展,非线性负载在农村电网的大量应用给电网带来了严重的谐波污染。我国农村电网以三相四线制低压网络向用户供电,无功负荷主要集中在电网末端,其中配电压器和用电设备(主要是异步电动机)的无功消占总无功负荷的95%以上。这些变压器容量必须按农忙季节或防汛抗旱等要求进行配备,用电季节性强、电力负荷分散、峰谷悬殊,从而普遍存在马拉小车现象,使得农网配变长时间处于低负荷运行状态,消耗大量农网无功;农网的第2个用电特点是用电负荷分散,供电半径过长,输电线路亦消耗大量无功功率。第3个特点是农网的无功补偿设备配置不合理,线路陈旧、杂乱、导线截面过小,而且许多地方仍然在使用老式高耗能的变压器,这些设备的存在不仅产生了电压质量差和线损大的问题,而且也消耗了电网中的无功。本文通过对瞬时无功功率的分析和无功功率补偿装置的研究设计一个适合农村电网的谐波抑制和无功功率补偿系统。

关键词: 农村电网 谐波 无功功率补偿 无源滤波器


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 filter(PPF)is most widely used as harmonic-eliminating device in power system,because of simple configuration,low investment,high reliability,and low operation cost.This paper penetrates on aprofound and detailed study on the parameter design of PPF. With the continuous progress of rural development, the application of nonlinear load in rural power grid brings serious harmonic pollution to power grid. Rural power grid in China in three phase four wire system low voltage network to the user. Reactive load are mainly concentrated in the end of the power grid, including voltage device and electric equipment (mainly asynchronous motor) reactive account for more than 95% of total reactive load. The transformer capacity must be equipped with required by or flood control and drought relief, the busy farming season, strong seasonality, disperse power load and electricity peak valley, which are widespread mara car phenomenon, make the low load operation of the site with longer time, consume a large amount of rural electric reactive power. Rural electric power load is the second power characteristic of scattered, power supply radius is too long, also consume a large amount of reactive power transmission lines. Third feature is the reactive power compensation equipment site configuration is not reasonable, the old line, the clutter, wire section is too small, and many places still use the old gas-guzzling transformer, the existence of these devices not only produce the voltage quality is poor and the problem of line loss, but also consumes the reactive power in power grid. This article through to the analysis of the instantaneous reactive power and reactive power compensation device of study design a suitable for rural power grid harmonic suppression and reactive power compensation system.

Key words: Rural power grid Harmonic pression reactive compensation passive filter
目录
第一章 绪论 1
1.1谐波的产生及危害 1
1.2谐波抑制与无功补偿的关系 2
1.3谐波的抑制 2
1.4农网中的无功补偿 5
1.5电力系统无功补偿技术的发展现状 7
1.6研究内容 7
第二章 谐波与无功的检测 9
2.1电力系统谐波的定义 9
2.2电力系统谐波与无功的检测方法 11
2.2.1频域理论 12
2.2.2小波变换 12
2.2.3神经网络 13
2.3快速傅立叶法检测 14
2.3.1 周期函数的傅立叶表示 14
2.3.2 傅立叶级数的指数形式 15
2.3.3 离散傅立叶变换(DFT) 17
2.3.4 快速傅立叶变换(FFT) 18
2.4基于瞬时无功理论的谐波和无功功率检测 20
2.4.1 三相电路的瞬时无功功率理论 20
2.4.2 三相电路的谐波和无功电流的实时检测 23
第三章 无功补偿 28
3.1 无功补偿技术概述 28
3.1.1 正弦电路功率因数的定义 28
3.1.2 非正弦电路功率因数的定义 29
3.2 饱和电抗器型无功补偿装置(SR) 31
3.2.1 自饱和电抗器型静止无功功率补偿装置 31
3.2.2 可控饱和电抗器型静止无功功率补偿装置 31
3.3晶闸管投切电容器型静止无功补偿(TSC) 32
3.4 采用全控器件的静止无功发生器(SVG) 33
3.5晶闸管控制电抗器型静止无功补偿装置(TCR) 34
3.5.1 TCR动态静止型无功补偿装置理原 34
3.5.2 TCR+TSC混合型静止无功补偿装置 37
3.5.3 TCR型主电路的晶闸管阀及其保护 37
3.5.4 TCR的触发系统 38
第四章 单调滤波器的设计和改进方法 40
4.1引言 40
4.2 LC滤波器的结构和基本原理 40
4.2.1单调谐滤波器 40
4.2.2影响单调谐滤波器性能的参数研究 41
4.3 LC滤波器的设计准则和设计步骤 43
4.3.1 LC滤波器设计准则 43
4.3.2 LC滤波器的设计步骤 44
4.3.3单调滤波器的设计 45
4.4单调滤波器的改进方法 49
4.4.1交流调谐滤波器的改进思路 49
4.4.2电抗器可调方案 50
第五章 农网的谐波抑制和无功补偿系统的设计譆@� 52
5.1设计背景 52
5.2 主要功..