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中文摘要：
针对双极柔性直流输电系统站内接地故障,对其故障机理及故障特性进行研究,推导故障分量的数学表达式。分析结果表明,故障发生后交流电流会出现直流偏置导致交流断路器无法正常断开,并且故障站子模块持续充电导致子模块严重过压。针对上述情况,制定相应的保护控制策略,并通过仿真结果验证了相关理论计算及控制保护策略的正确性。
英文摘要：
In view of converter grounding fault of bipolar flexible high voltage direct current（HVDC） transmission system, fault mechanisms and fault characteristics were studied, and mathematic expression of fault components were derived. Analysis results show that the AC fault current contains DC bias leading to the AC breaker cannot disconnect properly and the DC fault current continuously charge the sub-module leading to the sub-module overvoltage seriously. According to the aforementioned situation, control and protection schemes were developed. The simulation results demonstrate the relevant analysis is precise and the protection scheme is validity.
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