毕业设计说明书中文摘要由电能质量下降影响设备正常工作的现象引起了广泛的关注，尤其是无功补偿问题得到了人们的普遍重视。静止无功发生器作为近几年来无功补偿装置的研究热点，它不但可以地对系统中的无功功率做出准确的动态补偿，而且可以抑制电压不平衡，有益于提高电力系统稳定性，应用前景十分可观。82683

本文先对静止无功发生器当前的发展情况做出介绍并对其工作原理做出数学分析，通过对工作特性曲线的比较凸显其无功补偿范围大的特性。无功电流实时准确检测是无功补偿的前提。在瞬时无功功率原理下，本文介绍了两种检测无功电流的方法： p-q运算方法和ip-iq运算方法。为了提高静止无功发生器的性能，本文设计了电流直接控制的双闭环控制策略，可以实现在稳定直流侧电容电压的同时补偿无功功率。而且考虑了在不平衡的运行方式下，设计了运用ip-iq运算方法的正序、负序同步控制策略，实现了无功电流动态补偿的同时抑制电流的负序分量。

最后，在MATLAB仿真平台上对所提出的控制方法进行仿真。仿真波形图证明了所提出的控制策略能够同时补偿无功电流和实现对负序电流的抑制，基本符合设计要求。

毕业论文关键词  静止无功发生器  负载不平衡  无功补偿  直接电流控制

毕业设计说明书外文摘要

Title    Study on the Operation Strategy of SVG  Under Unbalanced Circumstance                                                   

Abstract Recently, with the remarkable improvement of modern technology, an increasing number of perse electronic equipment requires a high demand for the quality of electricity, which causes widespread concern for reactive power compensation。 SVG is a hot topic among the reactive power compensation device in recent years, which is not only effective to make real-time dynamic reactive compensation but also effectively compensate for voltage imbalance and improve the stability of the power system。 In the foreseeable future, SVG has a promising market。

In this paper, the development trend and recent research of SVG is primarily presented。 Then，by presenting the mathematic analysis of Working principle and characteristics, the outstanding ability of reactive compensation of SVG is highlighted。 Based on the instantaneous reactive power theory, two ways of reactive current detection methods are introduced: p-q operation method and ip-iq Algorithm。 In order to improve performance of SVG, this paper proposes a dual-loop control strategy, which can compensate reactive power as well as stabilize DC capacitor voltage。

At last, the proposed strategy is put into simulation by MATLAB。 The simulation confirmed that the proposed strategy can make reactive compensation and suppress the negative sequence current, which met the original design requirements。

Keywords  SVG  Unbalanced loads  Reactive compensation  Direct-current control

目   次

1 绪论 1

1。1 课题研究背景及意义 1

1。2 不平衡现象概述及危害 2

1。3 无功补偿的发展 3

1。4 静止无功发生器的发展趋势 4

1。5