摘要
交流输电线路接地或相间短路故障容易引起直流受端换流站交流母线电压跌落或畸变,进而导致直流换相失败。为此梳理了影响直流换相失败的因素,说明了直流持续换相失败到直流闭锁所需的时间。针对深圳电网多直流馈入的结构,分析不同片网的交流线路故障对直流换相失败的影响,根据直流换相失败期间的功率变化情况评估现有模型的准确度,并基于影响结果区分了不同片区的交流故障对直流换相失败的严重程度,结果表明深圳电压多馈入直流换相失败的概率,与交流线路故障类型以及故障线路电气距离密切相关。
AC transmission line grounding or interphase faults easily cause the AC bus voltage of DC receiving-end converter station to drop or distort,which leads to DC commutation failure.This paper sorts out the influencing factors of HVDC commutation failure,and illustrates the time required for continuous DC commutation failure to DC block.In view of multi-infeed HVDC structure of Shenzhen power grid,the impact of AC line faults of different grids on DC commutation failure is analyzed.According to the power change during the DC commutation failure,the accuracy of the existing models is evaluated.Based on the impact results,the severity of DC commutation failures caused by AC transmission line faults in different area is distinguished.The simulation results show that the multi-infeed DC commutation failure probability of Shenzhen voltage is closely related to the fault type of AC lines and the electrical distance of the fault lines.
作者
马伟哲
MA Weizhe(Shenzhen Power Supply Bureau Company,Shenzhen 518000,China)
出处
《电工技术》
2020年第9期42-45,共4页
Electric Engineering
