WENG Hanli,JIA Yongbo,LIU Lei,et al.Mal-operation mechanism and novel cross-approximate entropy based blocking scheme of bridge differential protection in converter stations[J].Electric Power Automation Equipment,2019,39(09):88-94.
WENG Hanli,JIA Yongbo,LIU Lei,et al.Mal-operation mechanism and novel cross-approximate entropy based blocking scheme of bridge differential protection in converter stations[J].Electric Power Automation Equipment,2019,39(09):88-94.DOI: 10.16081/j.epae.201909006.
Mal-operation mechanism and novel cross-approximate entropy based blocking scheme of bridge differential protection in converter stations
Aiming at the situation that multiple mal-operation events of bridge differential protection in converter stations occurred during the operation process of HVDC transmission projects,the mal-operation mecha-nism is researched. The UHVDC transmission simulation model is built in PSCAD/EMTDC,the mal-operation behaviors of bridge differential protection in the cases of no-load closing and external fault removal are simulated and analyzed to reveal the mal-operation reasons,and a novel blocking scheme for preventing mal-operation of bridge differential protection based on cross-approximate entropy algorithm is proposed,which can prevent mal-operation of bridge differential protection caused by CT transformation abnormality. The simulative results show that the proposed scheme can effectively prevent mal-operation of bridge diffe-rential protection in the cases of magnetizing and recovery inrush current.
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