考虑直流电流变化及交流故障发生时刻影响的HVDC换相失败分析方法

发布时间：2018-01-06 12:28

本文关键词：考虑直流电流变化及交流故障发生时刻影响的HVDC换相失败分析方法　出处：《电网技术》2015年05期 　论文类型：期刊论文

【摘要】：研究了交流系统三相对称故障造成的直流电流变化及故障时刻对HVDC换相失败的影响,由关断角减小到换相失败临界值,推出换相电压值的计算方法。该方法在经典计算方法的基础上,考虑了故障后直流电流的变化,推导了换相电压值与关断角的关系式;在此基础上进一步研究了故障时刻对临界换相电压值的影响,推导了故障时刻与临界换相电压值的关系式。对双极直流系统算例进行了相应的计算分析,并通过时域仿真验证了该分析结果的正确性。研究得出,计算临界换相电压值在计及故障造成的直流电流的变化和故障时刻的影响是不同的,该方法可有效提高理论分析临界换相电压值的计算精度,进一步说明故障后是否发生换相失败,与是否有足够的关断角或相应的反向换相电压时间面积相关。
[Abstract]:Effect of DC current changes and fault time of three-phase AC system caused by the failure of commutation failure in HVDC, by the turn off angle to reduce commutation failure critical value, launched for calculation of phase voltage. The method is based on the classical calculation method, considering the change of DC current after a fault is derived the commutation voltage value and turn off angle relation; on the basis of further research on the failure moment of critical commutation voltage, phase voltage and fault time is critical for value relationship. For example a bipolar HVDC system is analyzed and the corresponding calculation, the correctness of the analysis results verified by time domain simulation. The results of calculation, the critical effect of commutation voltage and DC current value resulting in failure and the change of fault time is different, this method can effectively improve the theoretical analysis of critical commutation power The calculation accuracy of pressure value further indicates whether commutation failure occurs after failure, which is related to whether there is enough turn off angle or the corresponding reverse commutation voltage and time area.

【作者单位】：国网湖北省电力公司经济技术研究院;强电磁工程与新技术国家重点实验室(华中科技大学);国网湖南省电力公司电力科学研究院;
【分类号】：TM721.1
【正文快照】： moment of AC fault0引言随着“西电东送、南北互供和全国联网”战略的逐步推进,华北—华中—东北将通过特高压交流形成同步电网,并将与华东、西北和南方3个电网采用直流方式实现异步互联[1-2]。如果这些直流通道中的某个换流站发生了单次换相失败,直流输送功率将减小,若发生

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