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1.梯级水电站运行与控制湖北省重点实验室(三峡大学),湖北省宜昌市 443002
2.国网甘肃省电力公司检修公司,甘肃省兰州市 730000
3.中国长江电力股份有限公司,湖北省宜昌市 443002
翁汉琍(1980—),女,博士,副教授,主要研究方向:电力系统分析、继电保护与控制。E-mail:honey_weng@163.com
郭祎达(1997—),女,硕士研究生,主要研究方向:电力系统分析、继电保护与控制。E-mail:286826552@qq.com
李昊威(1994—),男,通信作者,硕士,主要研究方向:电力系统分析、继电保护与控制。E-mail:835020738@qq.com
收稿日期:2019-12-16,
修回日期:2020-07-15,
网络出版日期:2020-09-23,
纸质出版日期:2020-12-10
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翁汉琍,郭祎达,李昊威等.涌流工况下换流变压器零序差动保护误动对策[J].电力系统自动化,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.
翁汉琍,郭祎达,李昊威等.涌流工况下换流变压器零序差动保护误动对策[J].电力系统自动化,2020,44(23):143-149. DOI: 10.7500/AEPS20191216010.
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.
针对高压直流输电工程中换流变压器零序差动保护误动的案例,采用基于工程实际参数的高压直流输电仿真模型,对换流变压器外部故障切除恢复性涌流及空载合闸励磁涌流导致中性线零序电流幅值较大且衰减缓慢的现象进行了仿真分析。通过识别中性线零序电流与自产零序电流波形呈现出的相似度特征在涌流工况和区内故障时的差异,提出了基于零序电流动态时间弯曲距离的换流变压器零序差动保护新判据。经仿真算例和录波案例验证,该判据在各类区内故障时具有与传统零序差动保护相同的保护范围及抗过渡电阻能力,可以正确辨识涌流工况下电流互感器传变异常引起的虚假差动电流,进而降低零序差动保护误动风险。
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.
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