基于星形接法的三相链式功率调节系统直流母线电压平衡控制  

DC Bus Voltage Balancing Control of Three-Phase Cascade Power Regulation System with Star Connection

作　　者：万承宽[1,2] 杨耕[3] 张桐硕[2] 邬伟扬[2] 赖成毅 

机构地区：[1]东方日立(成都)电控设备有限公司,成都611731 [2]燕山大学电力电子节能与传动控制河北省重点实验室,秦皇岛066004 [3]清华大学自动化系,北京100084

出　　处：《电工技术学报》2012年第12期256-263,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金重点资助项目(50837003,60974130)

摘　　要：三相链式功率调节系统可用于电网的瞬态有功、无功调节。该系统有多组直流母线,由于其直流母线上储电装置的性能不一致、以及负载参数不同,将引起系统各个直流母线电压不等或不平衡,从而影响系统的可靠运行以及满额运行。针对星形接法的链式功率调节系统三相直流母线电压不平衡的问题,本文提出了一种基于负序电压注入的平衡三相直流母线电压方法。论文说明了方法的原理,推导了主要的实现步骤,与已有的基于零序电压注入的平衡方法进行了比较。仿真和实验证明该方法的有效性。Three-phase cascade H-bridge（CHB） power regulation system（PRS） can be used for the dynamic adjustment of active and/or reactive power in power grid.This system consists of many sets of DC bus.Because of the performance differences of the electrical storage unit and load imbalance in DC bus,the DC link voltages are imbalance among different phases,which makes derating operation or even failure.This paper proposes a DC voltage balance method based on the negative-sequence-voltage injection.The principle of the method is described and the basic algorithms are derived for the implementation.The strategy is also compared with the zero-sequence voltage injection based strategy.The simulation and experimental results verify validity of the method.

关 键 词：直流母线电压平衡 负序电压注入 H桥级联变换器 功率调节系统 

分 类 号：TM712[电气工程—电力系统及自动化]