摘要
三相链式功率调节系统可用于电网的瞬态无功调节。该系统由多个独立的H桥单元串联组成,由于各H桥单元损耗以及直流母线上电容参数不同,将引起系统各个直流母线电压不平衡,从而影响系统的可靠运行。本文提出了一种具有软充电功能的拓扑结构,针对三相直流母线电压不平衡的问题,采用了一种基于负序电压注入的平衡三相直流母线电压的方法。论文说明了控制方法的原理,推导了主要的实现步骤。物理实验证明了系统控制方法的有效性。
Three-phase cascade H-bridge, （CHB） power regulating system （PRS） can be used for dynamic adjustment of reactive power in power grid. This system consists of many sets of DC buses. Because of the performance and loss in differences of the capacitance unit in DC bus, the DC link voltages are imbalanced among different units, which makes derating operation or even failure. This paper presents a topology with soft charging function based on the cascade power regulation system, using a DC voltage balance method hased on the negative-sequence-voltage injection. The principle of the method is described and the basic algorithms are derived for the implementation. The experimental results verify the validity of the method.
出处
《东方电气评论》
2015年第1期15-20,共6页
Dongfang Electric Review
