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

摘要

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.%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。