ZHUANG Yi,LI Xiaopeng,TENG Yufei,et al.Novel method for HVDC power transmission system grounding electrode line protection[J].Electric Power Automation Equipment,2019,39(09):74-79.
ZHUANG Yi,LI Xiaopeng,TENG Yufei,et al.Novel method for HVDC power transmission system grounding electrode line protection[J].Electric Power Automation Equipment,2019,39(09):74-79.DOI: 10.16081/j.epae.201909005.
Novel method for HVDC power transmission system grounding electrode line protection
To deal with the problem that the existing grounding electrode line protections based on signal injection might have protection failure under certain fault conditions,a novel approach of grounding electrode line protection based on multi-band voltage amplitude integration is proposed. Simulative analysis indicates that the voltage spectrum of the head end changes greatly after the faults occurred in grounding electrode line. On this basis,the proposed approach utilizes the wavelet packet analysis to provide different frequency bands of head-end voltages,and the variation of voltage amplitude integration is used as fault identification criterion. Simulative results based on PSCAD/EMTDC indicate that the proposed protection method effectively identifies different types of faults on the grounding electrode line,and its performance is not affected by the fault resistance. Hence,the proposed approach has promising prospects for engineering applications.
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