徐敬友;谭海燕;孙海顺;吴晋波;

• 1:国网湖北省电力公司经济技术研究院
• 2:强电磁工程与新技术国家重点实验室(华中科技大学)
• 3:国网湖南省电力公司电力科学研究院

摘要(Abstract)：

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。

关键词(KeyWords)： 高压直流输电;换相失败;临界换相电压值;直流电流;故障时刻

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 徐敬友;谭海燕;孙海顺;吴晋波;

Email:

DOI: 10.13335/j.1000-3673.pst.2015.05.014

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