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为了克服传统配电静止无功补偿器(D-STATCOM)主电路拓扑结构存在的缺陷,提出了一种新型主电路拓扑结构——基于变压器隔离型链式逆变器的主电路拓扑结构。进行了基于载波移相空间矢量脉冲宽度调制(SVM)脉冲控制策略的仿真研究。在三相直流电容共用情况下,给出了不平衡负荷补偿的控制算法。基于以上原理的±10kvarD-STATCOM的实验结果表明了所提主电路结构的有效性及不平衡负荷补偿控制方法的正确性和实用性。
In order to overcome the shortcomings of the main circuit topology of D-STATCOM, a new main circuit topology is proposed, which is based on the main circuit topology of the isolated inverter. The simulation research on the pulse control strategy based on carrier phase shift space vector pulse width modulation (SVM) is carried out. Under the condition of sharing three-phase DC capacitor, a control algorithm of unbalanced load compensation is given. The experimental results of ± 10kvarD-STATCOM based on the above principles show the validity of the proposed main circuit structure and the correctness and practicability of the unbalanced load compensation control method.