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中文摘要：
换相失败是直流输电（HVDC）系统常见的故障,模拟仿真换相失败时暂态反映特性曲线非常必要,分析了产生换相失败的影响因素,采用PSCAD/EMTDC仿真软件,以CIGRE直流输电第一标准模型为仿真电路,模拟逆变侧单相短路故障和三相短路故障时直流侧和交流侧的电压变化,波形显示单相短路故障比三相短路故障恢复快。若增大熄弧角γ来减小换相失败的几率,直流输电系统会减少输送功率,消耗更多的无功功率。
英文摘要：
Commutation failure is a common fault in HVDC system and simulation of the transient characteristic curve in commutation failure is very necessary.Some factors causing the commutation failure were presented.By using PSCAD/EMTDC simulation software and taking CIGRE HVDC benchmark model as the simulation circuit,the variations of the DC and AC side voltages when the single-phase fault and the three-phase fault occurring on the inverter side were simulated.The waveforms showed that the single-phase fault recovered more rapidly than the three-phase fault.If the extinction angle γ was increased to reduce the probability of the commutation failure,the HVDC system would reduce the transmission power and consume more reactive power.
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