基于直流侧能量的星接级联STATCOM零序电压注入控制方法

设计了一个应用于工业和配电网的级联STATCOM,采用相移载波脉冲宽度调制.提出了一种基于直流侧能量的新型星接级H桥STATCOM零序电压注入的控制策略,提出的方法利用对零序电压与补偿电流的相互作用,使有功功率在三相之间建立起一种交换机制,将不平衡量导致的直流侧的影响在三相之间平均起来,避免了补偿器的负序过流,在保证跟踪补偿电流的同时保持阀组之间直流侧电压平衡;最后通过仿真和实验结果验证了该方法的准确性与快速性,证明该方法可提高级联H桥拓扑结构不对称补偿的响应速度与精确度,解决了该拓扑结构在系统电压不对称或负载不平衡情况下的控制.通过仿真和实验验证了提出的方法的有效性和可靠性.

Zero-sequence Voltage Injecting Control of Cascaded STATCOM Based on DC Side Energy

A cascaded STATCOM （static synchronous compensator） used in industrial and distribution network is designed and studied in this paper,using phase shift cartier pulse width modulation control strategy.A novel zero sequence voltage injecting control method of cascaded STATCOM based on DC side energy is proposed in this paper.Based on the interaction of zero-sequence voltage and compensating current,an active power exchange among the three-phase is established which can average the DC side effect caused by unbalanced components.Negative over-current of compensator can be avoided and the cluster＇ s DC side capacitor voltage balance can be maintained with the assurance of tracking the compensating current.Simulation and experimental results proved that the asymmetrical compensation response speed and precision of cascaded H-Bridge topology can be improved and the topology control under asymmetrical voltage and unbalanced load is realized.Simulation and experimental results proved the accuracy and rapidity of the proposed method.