摘要：对电力系统进行无功补偿是为了满足电力系统的发展、各种电气设备对电能质量要求，柔性输电(FACTS)的需要。具有先进控制性能和良好补偿效果的静止无功发生器(SVG)是一种能够实现无功功率动态补偿的有效方法。

本文第一章论述了电网中无功功率的形成及其危害，及无功补偿装置的发展；在第二章介绍了静止无功发生器SVG的工作原理和电流检测方法，在分析比较了各种主电路的拓扑结构之后，选择了三电平二极管箝位型结构作为本文的主电路结构；对无功电流进行准确、快速的检测是实现无功补偿的前提条件，经过对各种电流检测方法的分析最

终选择了基于瞬时无功功率的ipiq检测方法作为本课题的无功电流检测方法；控制方法方面，采用了空间电压矢量脉宽调制，并切加入了中点电位平衡控制以实现了对无功功率的动态实时补偿。在分析研究掌握了SVG的基本原理，拓扑结构和控制方法之后，通过Saber仿真软件搭建出三电平二极管箝位型SVG进行仿真分析。验证所设计的SVG具有有效的动态实时补偿能力。

关键词 静止无功发生器，无功补偿，三电平，空间电压矢量脉宽调制

毕业设计说明书外文摘要

Title Analysis and Design of Small Static Var Generator

Abstract：With the development of power electronics technology, the power quality requirements of various kinds of electrical equipment have been improved, and the reactive power compensation problem in power quality is becoming more and more important with the need of flexible AC transmission system (FACTS).The static var generator (SVG) is an effective method for dynamic compensation of reactive power in power system. Due to its advanced control performance and good compensation effect, SVG has become a hotspot in the field of power electronics research and flexible AC power transmission system.

This paper first discusses the generation of reactive power and its harm to the power system. On this basis, the development of reactive power compensation device is expounded, which leads to the research content of this subject.Then, the working principle of SVG is analyzed. After studying the topology of various main circuits, the three - level diode - clamped structure is chosen as the main circuit structure.The condition of reactive power compensation is to detect the reactive current accurately and quickly. Based on this, the ip-iq detection method based on instantaneous reactive power is adopted.Then, this paper analyzes the various control methods of SVG. Finally, the space voltage vector pulse width modulation is adopted, and the midpoint potential balance control is added and the dynamic real time compensation of reactive power is realized. After the theoretical research and the control strategy are determined, the simulation model is built by Saber simulation software and the simulation analysis is carried out. The parameters of the simulation model are selected according to the engineering design standard, and the simulation results are obtained. Power compensation is expected to prove that the design of the SVG has a good dynamic real-time compensation performance.

Keywords Static Var Generator，Reactive Power Compensation，Three-level , Space—vector Pulse WidthModulation

目次

1 绪论 1

1.1 课题研究的背景和意义 1

1.2 无功功率的产生及无功补偿装置的发展 1

1.2.1 无功功率的产生及危害