动态电容器复合控制策略及其谐振问题分析  

Analysis of Resonance Problem and Integrated Control Strategy for Dynamic Capacitor

作　　者：戴子薇[1] 陈新文[1] 王欣 戴珂[1] 

机构地区：[1]华中科技大学强电磁工程与新技术国家重点实验室,武汉430074 [2]台达电子企业管理有限公司,上海201209

出　　处：《电气工程学报》2015年第7期33-40,共8页Journal of Electrical Engineering

基　　金：国家自然科学基金面上资助项目(51277086)

摘　　要：电力电容器是补偿电力系统静态无功的基本元件,本文采用Buck型交流变换器对其进行改造形成动态电容器,在多同步旋转坐标系下采用偶次谐波调制的控制方法,进行了动态电容器的Matlab/Simulink建模仿真,验证了其无功和谐波等复合补偿功能。同时,理论分析表明,静态和动态电容器均可能导致电力系统谐波谐振问题,在检测网侧电流对动态电容器进行控制的情况下,控制系统的环路稳定性因谐波谐振的存在而遭到破坏,可以通过改变谐振谐波检测指令极性的方法对其进行有效抑制,初步的仿真结果完全验证了上述分析的正确性。Power capacitor, was a basic element to supply static VAR in power system, which could be upgraded into dynamic capacitor using Buck-type AC-AC converter in this paper. By means of multiple synchronous reference frames and even harmonic modulation method, the simulation model of dynamic capacitor was built under Matlab/Simulink environment, and the VAR and harmonic integrated compensation functions of it were well proved. In the meanwhile, it was shown that either static or dynamic capacitor might cause harmonic resonance problem. The stability of the control loop of dynamic capacitor was corrupted for the existence of harmonic resonance when method of measuring grid current was used to control it. It could be improved by changing the polarity of resonant harmonic references, which was completely verified by preliminary simulation results.

关 键 词：动态电容器 偶次谐波调制复合补偿 谐波谐振 

分 类 号：TM464[电气工程—电器] TM714.3