摘要
对MMC拓扑以及负序电流的产生进行分析,以基于正弦分解的瞬时对称分量法对交流故障电压分离出正序负序分量,并改进双闭环控制策略,对正序负序电量分别控制并叠加于控制参考电压。仿真表明控制方法有效抑制负序电流,并使柔性直流输电系统不平衡情况下保持阀侧电流对称运行,不发生换流器闭锁,保证输电系统在故障切除前持续运行。
A modified instantaneous symmetrical components method was used to isolated positive and negative sequence components from the AC breakdown voltage. With improved dual-loop control system, the positive and negative sequence voltages were controlled and superimposed on the voltage reference. Simulation results show that this strategy is effective to suppress the negative sequence current, and to keep the valve-side current symmetric. It is ensured the flexible HVDC system continued operation in imbalance condition without lockout the inverters.
出处
《云南电力技术》
2015年第5期97-101,共5页
Yunnan Electric Power
基金
广东省第三批领军人才专项资金资助项目
