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中文摘要：
为了减小含有STATCOM的HVDC输电系统发生换相失败的概率,对STATCOM和HVDC系统原有的控制策略进行了改善。故障时,基于STATCOM的定交流电压控制,投入交流电压参考值调节功能;基于HVDC的定直流电流控制和定关断角控制,投入附加直流电流和附加关断角控制功能。在PSCAD/EMTDC中进行的仿真分析表明：当换流母线处分别发生故障水平为23.08%、84.24%的单相电感接地故障时,交流电压参考值调节功能可以有效抵御换相失败、防止连续换相失败;当故障更严重,故障水平上升为120.34%时,附加直流电流和附加关断角控制功能可以有效防止连续换相失败。所提出的控制方法可以有效提高HVDC对换相失败的抵御能力,改善系统的运行性能。
英文摘要：
In order to reduce the probability of commutation failure in HVDC transmission system equipped with STATCOM, we developed an improved control strategy of STATCOM and HVDC system. When a fault occurs, based on the constant AC voltage control of STATCOM, a regulation function for AC voltage reference value is applied to STAT- COM. Meanwhile, additional DC current and extinction angle control functions are applied to HVDC system. Simulation in PSCAD/EMTDC shows that the proposed constant AC voltage control of STATCOM can mitigate commutation failure when the levels of single phase fault at inverter busbar are 23.08% and 84.24%, and the additional DC current and extinc- tion angle control functions can prevent continuous commutation failure when the fault level gets higher, such as 120.34% Hence, the proposed control method can improve HVDC systems in both commutation failure immunity and operation performance.
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