基于Steinmetz理论的三相四线制不平衡电流补偿  

Three-phase Four-wire Unbalanced Current Compensation Based on Steinmetz Theory

作　　者：王江彬 田铭兴[1] 陈敏[1] 赵远鑫 

机构地区：[1]兰州交通大学自动化与电气工程学院,兰州730070

出　　处：《电力系统及其自动化学报》2016年第9期20-26,共7页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(51167009);国家自然科学基金资助项目(51367010);甘肃省科技计划资助项目(1304WCGA181);兰州市科技计划资助项目(2013-4-111)

摘　　要：由于零序分量的存在,三相四线制电路的不平衡补偿问题较三相三线制电路更复杂。该文基于Steinmetz理论的对称分量分析法考虑三相三线制系统负荷的平衡化补偿思路给出了三相四线制系统负荷不平衡电流的补偿方法,并给出3种约束方程下的补偿电纳模型。在三相四线制系统中,在已找到的3种约束方程条件下,对Y型联接的负荷进行零、负序电流补偿,并使系统功率因数提高到1。最后通过Matlab仿真表明,所提补偿理论不仅能实现不平衡电流的平衡化,还能使系统总功率因数接近于1,证明了所提补偿理论的正确性。Because of the existence of zero sequence components, the unbalanced compensation of three-phase four- wire system is more complicated than that of three-phase three-wire system. The compensation method of symmetrical component analysis method based on Steinmetz theory in three-phase three-wire system load balancing compensation is considered in the three-phase four-wire system unbalanced load current compensation. Moreover, the compensation model of three kinds of constraint equations is given. In the three-phase four-wire system with the three above constraint equations, attempts are made to compensate the zero sequence and negative sequence current for star-connected load, and increase the system power factor to 1. Finally, the Matlab simulation results show that the proposed compensation theory can not only keep the unbalanced current balanced, but also make the power factor of total system be equal to 1 approximately, which proves the correctness of the proposed compensation theory.

关 键 词：对称分量分析法 三相四线制 约束方程 零、负序电流补偿 

分 类 号：TM714.3[电气工程—电力系统及自动化]