Control of VSC-based STATCOM using conventional and direct-current vector control strategies
Control of VSC-based STATCOM using conventional and direct-current vector control strategies
复制标题
DOI：
10.1016/j.ijepes.2012.08.060
复制
发表时间：
2013-02
影响因子：
5.2
通讯作者：
Shuhui Li;Ling Xu;T. Haskew
中科院分区：
文献类型：
--
作者：
Shuhui Li;Ling Xu;T. Haskew
STATCOM是一种可以补偿无功功率并为交流系统提供电压支持的设备。随着电力电子技术的发展，基于VSC的IGBT或IGCT变换器在现代STATCOM系统中得到越来越多的应用。传统的基于VSC的STATCOM由一个电压源换流器和一个基于传统标准d-q矢量控制技术的控制系统组成，电压源换流器一侧连接到储能装置，另一侧连接到交流电力系统。本文研究并比较了基于VSC的静止同步补偿器（STATCOM）的传统矢量控制方案和直流矢量控制方案。分析了传统控制机制的局限性。基于直流矢量控制设计，提出了一种最优控制策略。闭环控制评估表明，D-STATCOM系统的工作以及使用所提出的控制机制内和超出转换器的线性调制限制，而传统的标准控制技术可能会导致过电压和系统振荡时，转换器操作超过其线性调制限制。
A STATCOM is a device that can compensate reactive power and provide voltage support to an ac system. Due to the advance of power electronic technology, VSC-based IGBT or IGCT converters have been increasingly used in modern STATCOM systems. A traditional VSC-based STATCOM consists of a voltage source converter, connected to an energy storage device on one side and to the ac power system on the other, and a control system based on the conventional standard d–q vector control technology. This paper studies and compares the conventional and a direct-current vector control schemes for a VSC-based STATCOM. A limitation of the conventional control mechanism is analyzed. An optimal control strategy is developed based on a direct-current vector control design. Close-loop control evaluation demonstrates that a D-STATCOM system works well using the proposed control mechanism both within and beyond the converter linear modulation limit while the conventional standard control technique could result in over voltage and system oscillations when the converter operates beyond its linear modulation limit.