开关电容变换器在DVR中的应用
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。