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中文摘要：
针对传统高压直流输电逆变侧易发生换相失败的问题,提出了一种新型强迫换相桥路拓扑,该拓扑的阀臂采用了两组串联晶闸管通过电容器并联结构。基于该拓扑结构,给出了3种工作状态及相互切换模式,设计了电容电压控制策略,并通过理论计算得到了电容预充电压的最优值。最后,在PSCAD/EMTDC仿真环境下搭建了所提出的新型桥路模型,进行正常及故障情况下的仿真,验证了电容电压控制策略的正确性,且与传统HVDC相比,新桥路能防御交流系统大部分单相故障,对三相故障也有很好的防御效果,有效地降低了换相失败发生的概率。所提出的拓扑结构可以有效提高HVDC对换相失败的抵御能力,改善系统的故障恢复特性。
英文摘要：
To reduce the commutation failure probability of line-commutated-converter based high voltage direct current （LCC-HVDC）, we proposed a new forced commutation bridge topology, of which each ann consists of two series of valve groups and one auxiliary capacitor. Based on the new topology, three operation states and switching modes are presented. Then, a control strategy of capacity voltage is proposed and optimal initial charging voltage of capacity is calculated theoretically. Finally, the proposed commutation bridge circuit is developed in PSCAD/EMTDC, and the steady state and transient performances of it is analyzed. Simulation results show that the new topology can mitigate the commutation failure effectively under AC faults condition. Hence, the proposed topology can improve HVDC systems in both commutation failure immunity and recovery performances.
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