针对换相失败影响因素分析已经取得一些成果,但故障清除时刻(故障分闸角)对换相失败的影响有待进一步研究.首先基于换相失败过程分析过零点偏移角对关断角的影响;其次基于换相电压时间面积法分析不同故障合闸角对逆变器首次换相失败的影响,并进一步分析故障分闸角及过零点偏移角对后续换相失败的影响,发现故障在换相过程中清除引发后续换相失败风险最大;最后以单相接地故障为例,基于PSCAD/EMTDC中的(conseil international des grands reseaux electriques,CIGRE)模型的不同故障合闸角与分闸角的仿真测试结果验证了理论分析的正确性.
Analysis of Subsequent Commutation Failures with Fault Division Angle and Single-Phase Faults Considered
Although some results have been obtained in the analysis of factors affecting commutation failure,but the influence of fault clearance time(fault division angle)on commutation failure still needs to be studied further.Firstly,based on the commutation failure process,the effect of zero-crossing offset angle on the turn-off angle is analyzed.Secondly,based on the time area of commutation voltage,the influence of different initial fault angles on the first commutation failure of the inverter is analyzed,and the influence of fault division angle and zero-crossing offset angle on subsequent commutation failure is further analyzed.It is found that the risk of subsequent commutation failure is greatest when the fault is cleared in commutation.Finally,taking single-phase grounding fault as an example,simulation test results of different initial fault angles and fault division angle based on PSCAD/EMTDC and CIGRE HVDC models verify the correctness of the theoretical analysis.
HVDC transmissionsingle phase ground faultcommutation failurezero-crossing offset anglephase-change voltage time areainitial fault anglefault division angle
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