10kV链式星接STATCOM直流电容参数计算与均压策略  

Calculation of DC Capacitor Parameter and Grading Strategy for 10kV Cascaded Star-connected STATCOM

作　　者：封磊 苟锐锋 张万荣 杨晓平 江戈 张艳梅 孙伟 

机构地区：[1]西安西电电力系统有限公司,陕西西安710065

出　　处：《电力电容器与无功补偿》2015年第3期24-31,36,共9页Power Capacitor & Reactive Power Compensation

基　　金：国家高技术研究发展计划(863计划)(2011AA050403)

摘　　要：静止同步补偿器(static synchronous compensator,STATCOM)普遍是由具有相同结构的H桥链节级联组成。根据链式星形接法STATCOM的拓扑结构分析了向量和数学模型;然后从能量脉动角度,结合电容电压波动系数,给出了直流电容的选取原则和计算方法;并针对直流电容电压均衡问题,详细阐述了总电压控制和链节电压控制的原理;进而将其实施到电压电流的双闭环控制策略当中,最终得到链节电压的预控值和微调量,从而实现了STATCOM各链节之间的电压均衡,以及与电网的有功平衡。仿真分析和工业样机的实验结果表明,所提控制方法的暂态和动态性能良好,可为STATCOM工程设计提供参考。Static synchronous compensator （STATCOM） is commonly composed of the H bridge link with same structure. In this paper, the vector and mathematical model is analyzed in accordance with the topology of star STATCOM, then the selection principle and calculation method of DC capacitance are given from the point view of energy pulsation together with fluctuation coefficient of capacitive voltage. The principle of full voltage and link voltage control is described in detail for the voltage balancing problem of DC capacitor, which is furthermore implemented in the double closed-loop of voltage and current con- trol strategy. Finally, the pre-control value and fine tuning variable of link voltage is obtained, thus achiev- ing voltage balance between links of STATCOM and the active power balance with the gird. It is shown by the simulation analysis and the experimental result of industrial prototype that both transient and dy- namic performance of the proposed method is good, which can provide reference for the STATCOM engi- neering design.

关 键 词：静止无功补偿器 链式 均压策略 

分 类 号：TM761[电气工程—电力系统及自动化]