摘要
采用静止同步补偿器(STATCOM)对配电系统中公共连接点处不平衡电压和电流进行控制是改善电网电能质量的一种有效方法。本研究利用开关函数基频模型,分析了STATCOM在不平衡控制时因交直流侧的调制耦合而导致STATCOM输出电流波形畸变的机理,提出了一种改进的开关函数,切断了STATCOM直流侧与交流侧的耦合通路,消除了不平衡补偿对STATCOM输出补偿电流的影响。以三相负荷不平衡控制为例,搭建了三相不平衡控制系统的仿真模型,验证了理论分析的正确性。
STATCOM adopted to control over unbalanced voltage and currents at the point of common coupling in power ditribution system is a kind of effective method to improve electric power qualities in power grid.The switching function model is used in this paper to analyse the STATCOM output current waveshape distorttion mechanism caused by modulation coupling between DC and AC sides in unblanced control,whereby an improved swithch function is presendted to cut off the coupling passageway from DC side to AC side so as to eliminate the influence of unbalanced control over the AC side current of STATCOM.With three-phase loading unblance control as an example,the simulation model of three-phase unbalance control system is established to test the correctness of theoretical analysis.
出处
《西安理工大学学报》
CAS
北大核心
2012年第4期459-463,共5页
Journal of Xi'an University of Technology
基金
陕西省重点学科建设专项基金资助项目(00X901)
陕西省工业攻关计划基金资助项目(2010K09-09)
