WENG Hanli,GUO Yida,LI Haowei,et al.Countermeasures for Mal-operation of Zero-sequence Differential Protection of Converter Transformer Under Inrush Current Condition[J].Automation of Electric Power Systems,2020,44(23):143-149.
WENG Hanli,GUO Yida,LI Haowei,et al.Countermeasures for Mal-operation of Zero-sequence Differential Protection of Converter Transformer Under Inrush Current Condition[J].Automation of Electric Power Systems,2020,44(23):143-149. DOI: 10.7500/AEPS20191216010.
Countermeasures for Mal-operation of Zero-sequence Differential Protection of Converter Transformer Under Inrush Current Condition
Aiming at the case of mal-operation of zero-sequence differential protection for the converter transformer in the high voltage direct current (HVDC) transmission project
this paper analyzes the phenomenon that the neutral-line zero-sequence current has a large amplitude and decays slowly under the recovery inrush current condition caused by removal of external faults and the inrush current condition caused by the energization of unloaded converter transformers
based on the HVDC simulation model using actual engineering parameters. By identifying differences in similarity characteristics between the waveforms of neutral-line zero-sequence current and the self-produced zero-sequence current under inrush current and internal fault conditions
this paper proposes a new criterion of the zero-sequence differential protection for converter transformers
based on the dynamic time warping (DTW) distance of zero-sequence current. The simulation and recorded cases show that the criterion has the same operation performance as the conventional zero-sequence differential protection in aspects of protecting range and transition resistance endurance ability during various internal faults. The false differential current caused by abnormal transmission of current transformers under the inrush current condition can be correctly identified
and the risk of mal-operation of zero-sequence differential protection can be reduced.
KANG Yiqun , YOU Li , LI Zhenyu , et al . Analysis on relay protection configuration of large generator-transformer unit [J]. Hubei Electric Power , 2018 , 42 ( 2 ): 32 - 35 .
LI Yingwen , LIU Tao , PEI Dongliang , et al . Configuration analysis on current differential protection for 1 000 kV UHV transformer [J]. Journal of Electric Power Science and Technology , 2017 , 32 ( 3 ): 106 - 113 .
ZHANG Wen , ZHOU Xiangsheng , SONG Shubo , et al . Improvement of the non-redundant problem of converter transformer protection of Yun-Guang UHVDC system [J]. Power System Protection and Control , 2014 , 42 ( 14 ): 151 - 154 .
DING Suyang , LIN Xiangning , WENG Hanli , et al . Mal-operation risk analysis and countermeasure on zero-sequence differential protection of converter substation during existence of recovery inrush due to fault removal [J]. Proceedings of the CSEE , 2017 , 37 ( Supplement 1 ): 12 - 20 .
LU Junsheng . Operation performance analyses and novel principles studies on differential-type protections of power transformer under AC-DC deeply coupling interactions [D]. Wuhan : Huazhong University of Science and Technology , 2016 .
TANG Jusheng . Research on transformer differential protection based on second harmonic braking [D]. Huainan : Anhui University of Science and Technology , 2018 .
JIN Enshu , SUN Shiyong , QI Zheng , et al . A new algorithm to prevent the mal-operation of transformer differential protection after removing external fault [J]. Power System Protection and Control , 2011 , 39 ( 12 ): 27 - 30 .
LIU Zhongping , LU Yuping , YUAN Yubo . Study of transformer recovery inrush after clearance of external faults [J]. Automation of Electric Power Systems , 2005 , 29 ( 8 ): 41 - 44 .
LIU Penghui , HUANG Chun . A fault section location method for small-current grounding fault in distribution network based on dynamic time warping distance [J]. Power System Technology , 2016 , 40 ( 3 ): 952 - 957 .
LI Hailin , YANG Libin . Similarity measure for time series based on incremental dynamic time warping [J]. Computer Science , 2013 , 40 ( 4 ): 227 - 230 .
ZHU Hongtao , LI Shan , XIAO Yong , et al . Rail waveform matching method based on dynamic time warping [J]. Journal of Vibration and Shock , 2018 , 37 ( 11 ): 246 - 251 .
HUANG Chun , LIU Penghui , JIANG Yaqun , et al . Feeder differential protection based on dynamic time warping distance in active distribution network [J]. Transactions of China Electrotechnical Society , 2017 , 32 ( 6 ): 240 - 247 .
WENG Hanli , LI Xuehua , LU Junsheng , et al . Symmetrical inrush current mechanism of ultra-high voltage converter transformer and its impact on converter connection-transformer differential protection [J]. Automation of Electric Power Systems , 2017 , 41 ( 5 ): 153 - 158 .
WENG Hanli , LIU Lei , LIN Xiangning , et al . Mechanism and countermeasures of mal-operation of converter transformer zero-sequence overcurrent protection caused by inrush currents [J]. Automation of Electric Power Systems , 2019 , 43 ( 9 ): 171 - 178 .
WANG Ye , LU Yuping , XU Yichao , et al . A differential protection algorithm based on dynamic time warping [J]. Proceedings of the CSEE , 2012 , 32 ( 28 ): 133 - 141 .
WENG Hanli , WANG Sheng , LIN Xiangning , et al . Waveform similarity based transformer phase differential protection against current transformer saturation [J]. Automation of Electric Power Systems , 2019 , 43 ( 4 ): 132 - 138 .
LIN Xiangning , HUANG Jingguang , ZENG Linjun , et al . Analysis of electromagnetic transient and adaptability of second-harmonic restraint based differential protection of UHV power transformer [J]. IEEE Transactions on Power Delivery , 2010 , 25 ( 4 ): 2299 - 2307 .