用于不平衡补偿的变压器隔离型链式D-STATCOM的研究  

Research on the Transformer-isolated Multilevel H-bridges D-STATCOM for Unbalanced Load Compensation

作　　者：许树楷[1] 宋强[1] 朱永强[1] 刘文华[1] 李建国[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京市海淀区100084

出　　处：《中国电机工程学报》2006年第9期137-143,共7页Proceedings of the CSEE

基　　金：国家重点基础研究发展规划973项目(2004CB217907)~~

摘　　要：针对大容量冲击性负荷所带来的不对称、电压波动和闪变等电能质量问题,提出了基于变压器隔离型链式逆变器的D-STATCOM,用于对冲击负荷的快速补偿。首先针对主电路拓扑结构特点,提出了基于载波移相的空间矢量调制策略;针对不平衡负荷特点,采用基于双d-q变换和对称分量法计算补偿线电流,并提出了补偿相电流的优化设计方法来提高D-STATCOM的补偿能力。提出了瞬时电流分相控制方法,可以使D-STATCOM的输出快速地跟踪参考补偿电流以提高响应速度。在所建立的10kVA物理样机上的试验结果验证了所提方法的有效性。Research on distribution-static compensator （D- STATCOM） for unbalanced and nonlinear load compensation is proposed, A novel transformer-isolated multilevel H-bridges inverter is introduced, which is suitable for large unbalanced load compensation. A phase-shift space vector modulation （SVM） strategy is proposed. The dual d-q transformation and symmetrical components method are used to determine the compensation line-currents for unbalanced load. An optimum design method is proposed to balance the three-phase compensation currents of the delta-connected transformer. A current control scheme with fast response speed is designed to regulate the instantaneous three-phase currents separately. Finally the 10kVA D-STATCOM prototype is presented and the experimental results are used to verify the proposed methods.

关 键 词：配电侧静止无功发生器 隔离变压器 不平衡负荷补偿 双d-q变换 对称分量法 

分 类 号：TM76[电气工程—电力系统及自动化]