摘要动态电压恢复器(DVR)是最近几年来出现的补偿电压的设备,将它安装在负荷前端，当线路电压正常时DVR被短路，与主电路隔离从而不会工作;当系统电压畸变时,DVR将会在将会在非常短的时间内动作,对电压畸变进行有效补偿。开关电容变换器是一种新型、不含感性元件的电能变换器，它由电容以及开关元件等组成，功能为能量转换与电压变换。由于电路结构较为简单，因此开关电容体积小、重量轻。用开关电容作为DVR直流储能单元与逆变单元之间的电能转换器，能够有效消除低频纹，提高直流电能质量，从而提高补偿效果，并且省去了隔离变压器等大型器件所占空间。两者结合应用具有较大的现实意义。28083
关键词 动态电压恢复器 开关电容变换器 电压补偿
毕业论文设计说明书外文摘要
Title The Dynamic Voltage Restorer(DVR) Based on the Switched-capacitor Concept
Abstract
DVR is an emerging DFACTS device which is connected in series between power source and sensitive load.DVR will be bypassed as long as the circuit voltage is normal, and it will compensate for the abnormal change of voltage within millisecond scale. switched-capacitor is a typical non-inductance converter.The change of voltage and switch between different energy is mostly achieved by switch and capacitor.Since there is no inductance or transformer, the size and weight of power source can be greatly reduced. One of the advantage of using switched-capacitor as the electrical energy converter between DVR DC energy storage unit and converter unit is that it can efficiently diminish low frequency pattern and increase the quality of direct current so as to enhance the compensation effect and to avoid occupying size due to large-sized machines such as transformer. In general, the combination of DVR and switched-capacitor will definitely achieve high realistic value.
Keywords DVR switched-capacitor converter Voltage compensation
目 次
1 绪论 1
1.1 电能质量问题概述 1
1.2 动态电压恢复器DVR国内外研究现状 3
1.3 开关电容变换器概述 3
1.4 本论文的主要工作 4
2 动态电压恢复器（DVR）的结构与原理 5
2.1 DVR的基本结构 5
2.2 DVR的运行模式 6
2.3 DVR逆变器控制策略 6
3 主电路设计 7
3.1 主电路总体结构及参数设定 8
3.2 逆变模块结构选择 9
3.3 直流储能单元选择 10
3.4 输出滤波器 11
3.5 开关电容变换器结构选择 13
3.6 动态电压恢复器控制策略 14
4 仿真及结果分析 15
4.1 主电路仿真 15
4.2 检测电路仿真 16
4.3 逆变电路仿真 19
结 论 23
致 谢 24
参考文献25
1 绪论
1.1 电能质量问题概述
1.1.1 电能质量概念与问题分类
电力系统运营的意义在于在电能质量较高的情况下，不间断地给负载供电，保证有功功率与无功功率的平衡稳定，另一方面也要确保其经济性。
电能质量(Power Quality)，从严谨的学术方面讲，指的是电力系统的电压、频率和波形。从一般性上讲是指电压质量、电流质量、供电质量和用电质量。 开关电容变换器在DVR中的应用:http://www.751com.cn/zidonghua/lunwen_22801.html