基于波形相似度的抗电流互感器饱和变压器相位差动保护
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摘要
变压器差动保护中电流互感器饱和导致保护可靠性与速动性降低。文中利用波形相似度对变压器区内、区外故障,尤其是电流互感器饱和时两侧电流相位信息进行提取,提出一种基于波形相似度的抗电流互感器饱和变压器差动保护判据,以识别包含电流互感器饱和在内的各种故障情况。仿真与动模试验结果表明,该判据在识别变压器区内、外故障,尤其是电流互感器饱和时均能做出正确判断。对于噪声干扰的情况仅需做简单处理判据即可有效识别故障。
The saturation of current transformer results in the decrease of reliability and rapidity of transformer differential protection.The waveform similarity is used to extract the phase information of the current on both sides of the transformer,especially when the current transformer is saturated.A transformer differential protection criterion against current transformer saturation based on waveform similarity is proposed to identify various faults including saturation of current transformer.The results of simulation and dynamic simulation tests show that the criterion can make correct judgments when identifying faults inside and outside the transformer,especially when the current transformer is saturated.In the case of noise interference,the fault can be identified effectively only by simple processing.
The saturation of current transformer results in the decrease of reliability and rapidity of transformer differential protection.The waveform similarity is used to extract the phase information of the current on both sides of the transformer,especially when the current transformer is saturated.A transformer differential protection criterion against current transformer saturation based on waveform similarity is proposed to identify various faults including saturation of current transformer.The results of simulation and dynamic simulation tests show that the criterion can make correct judgments when identifying faults inside and outside the transformer,especially when the current transformer is saturated.In the case of noise interference,the fault can be identified effectively only by simple processing.
引文
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[10]杨恢宏,谢百煌,毕大强,等.基于虚拟制动电流采样点差动的CT饱和识别方法[J].继电器,2006,34(13):50-53.YANG Huihong,XIE Baihuang,BI Daqiang,et al.Using the sampling differential protection based on the constructed restraint current to identify CT saturation[J].Relay,2006,34(13):50-53.
[11]杨经超,尹项根,陈德树,等.采样值差动保护动作特性的研究[J].中国电机工程学报,2003,23(9):71-77.YANG Jingchao,YIN Xianggen,CHEN Deshu,et al.Study on the operating characteristic of sampled value differential protection[J].Proceedings of the CSEE,2003,23(9):71-77.
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[13]陈国锋.基于数学形态学的变压器差动保护的研究[D].北京:华北电力大学,2015.CHENGuofeng. Researchontransformerdifferential protection based on mathematical morphology[D].Beijing:North China Electric Power University,2015.
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[15]董新涛,康小宁,步梦琼,等.基于动态虚拟磁通分析的CT饱和识别方案研究[J].电力系统保护与控制,2017,45(7):126-130.DONG Xintao, KANG Xiaoning,BU Mengqiong,et al.Research on the method to identify CT saturation based on dynamic virtual magnetic flux[J].Power System Protection and Control,2017,45(7):126-130.
[16]赵航,林湘宁,喻锟,等.基于模量Hausdorff距离波形比较的直流输电线路选择性快速保护方案[J].中国电机工程学报,2017,37(23):6888-6900.ZHAO Hang,LIN Xiangning,YU Kun,et al.A high-speed protection scheme for HVDC transmission line based on Hausdorff distance comparison[J].Proceedings of the CSEE,2017,37(23):6888-6900.
[17]曹京京.Hausdorff距离的计算原理及其在二维匹配中的应用[D].大连:大连理工大学,2013.CAO Jingjing.The calculation theory of Hausdorff distance and its application to the matching of 2Dgeometrical objects[D].Dalian:Dalian University of Technology,2013.
[18]翁汉琍,刘华,林湘宁,等.基于Hausdorff距离算法的变压器差动保护新判据[J].中国电机工程学报,2018,38(2):475-483.WENG Hanli,LIU Hua,LIN Xiangning,et al.A novel criterion of the transformer differential protection based on the Hausdorff distance algorithm[J].Proceedings of the CSEE,2018,38(2):475-483.
[19]陈乐,薄志谦,林湘宁,等.基于波形相似度比较的线路快速纵联保护研究[J].中国电机工程学报,2017,37(17):5018-5027.CHEN Le,BO Zhiqian,LIN Xiangning,et al.Waveform similarity comparison based high-speed pilot protection for transmission line[J].Proceedings of the CSEE,2017,37(17):5018-5027.
[20]谷君,郑涛,黄少锋,等.变压器外部故障切除后差动保护误动原因及防止对策[J].中国电机工程学报,2009,29(16):49-55.GU Jun,ZHENG Tao, HUANG Shaofeng,et al.Maloperation of transformer differential protection after removal of731external fault and countermeasure[J].Proceedings of the CSEE,2009,29(16):49-55.
[21]袁宇波,陆于平,许扬,等.切除外部故障时电流互感器局部暂态饱和对变压器差动保护的影响及对策[J].中国电机工程学报,2005,25(10):12-17.YUAN Yubo,LU Yuping,XU Yang,et al.The influence and countermeasure to transformer differential protection of CT partial transient saturation caused by external fault removal[J].Proceedings of the CSEE,2005,25(10):12-17.
[2]翁汉琍,李雪华,鲁俊生,等.特高压换流变压器对称性涌流的生成及其对大差保护的影响[J].电力系统自动化,2017,41(5):153-158.DOI:10.7500/AEPS2016042000.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. DOI:10.7500/AEPS2016042000.
[3]曾杰,张禄亮,吴青华.基于形态学骨架的变压器差动保护[J].电力系统自动化,2017,41(23):68-76.DOI:10.7500/AEPS20170111008.ZENG Jie,ZHANG Luliang, WU Qinghua.Morphological skeleton based differential protection for power transformers[J].Automation of Electric Power Systems,2017,41(23):68-76.DOI:10.7500/AEPS20170111008.
[4]丛伟,王伟旭,肖静,等.控制合闸电压幅值的变压器励磁涌流抑制方案[J].电力系统自动化,2017,41(8):159-165.DOI:10.7500/AEPS20161014001.CONG Wei,WANG Weixu,XIAO Jing,et al.Transformer inrush current restraining scheme based on switching voltage amplitude controlling method[J].Automation of Electric Power Systems, 2017, 41(8):159-165. DOI:10.7500/AEPS20161014001.
[5]王志鸿,郑玉平,贺家李.通过计算谐波比确定母线保护中电流互感器的饱和[J].电力系统及其自动化学报,2000,12(5):19-24.WANG Zhihong,ZHENG Yuping,HE Jiali.A algorithm to distinguish current transformer’s saturation by calculating the harmonics ratio of branch current[J].Proceedings of the EPSA,2000,12(5):19-24.
[6]黄志元,何奔腾,张雪松.利用磁制动检测电流互感器饱和的实用化研究[J].电力系统自动化,2006,30(4):75-79.HUANG Zhiyuan,HE Benteng,ZHANG Xuesong.Research on the practicality of current transformer saturation detection using the magnetic restraint principle[J].Automation of Electric Power Systems,2006,30(4):75-79.
[7]李岩,陈德树,张哲,等.鉴别TA饱和的改进时差法研究[J].继电器,2001,29(11):1-4.LI Yan,CHEN Deshu,ZHANG Zhe,et al.Research of the improved time difference method to distinguish TA’s saturation[J].Relay,2001,29(11):1-4.
[8]沈全荣,严伟,梁乾兵,等.异步法电流互感器饱和判别新原理及其应用[J].电力系统自动化,2005,29(16):84-86.SHEN Quanrong, YAN Wei, LIANG Qianbing, et al.Asynchronous method for the recognition of current transformer saturation and its application[J].Automation of Electric Power Systems,2005,29(16):84-86.
[9]李旭,黄继东,倪传坤,等.不同电流互感器混用对线路差动保护的影响及对策的研究[J].电力系统保护与控制,2014,42(3):141-145.LI Xu,HUANG Jidong,NI Chuankun,et al.Influence of mixing different types of current transformers on line differential protection and the countermeasures[J].Power System Protection and Control,2014,42(3):141-145.
[10]杨恢宏,谢百煌,毕大强,等.基于虚拟制动电流采样点差动的CT饱和识别方法[J].继电器,2006,34(13):50-53.YANG Huihong,XIE Baihuang,BI Daqiang,et al.Using the sampling differential protection based on the constructed restraint current to identify CT saturation[J].Relay,2006,34(13):50-53.
[11]杨经超,尹项根,陈德树,等.采样值差动保护动作特性的研究[J].中国电机工程学报,2003,23(9):71-77.YANG Jingchao,YIN Xianggen,CHEN Deshu,et al.Study on the operating characteristic of sampled value differential protection[J].Proceedings of the CSEE,2003,23(9):71-77.
[12]SACHDEV M S,SIDHU T S,GILL H S,et al.A busbar protection technique and its performance during CT saturation and CT ratio-mismatch[J].IEEE Transactions on Power Delivery,2000,15(3):895-901.
[13]陈国锋.基于数学形态学的变压器差动保护的研究[D].北京:华北电力大学,2015.CHENGuofeng. Researchontransformerdifferential protection based on mathematical morphology[D].Beijing:North China Electric Power University,2015.
[14]林湘宁,刘沛,高艳.基于数学形态学的电流互感器饱和识别判据[J].中国电机工程学报,2005,25(5):46-50.LIN Xiangning,LIU Pei,GAO Yan.A novel method to identify the saturation of the current transformer using mathematical morphology[J].Proceedings of the CSEE,2005,25(5):46-50.
[15]董新涛,康小宁,步梦琼,等.基于动态虚拟磁通分析的CT饱和识别方案研究[J].电力系统保护与控制,2017,45(7):126-130.DONG Xintao, KANG Xiaoning,BU Mengqiong,et al.Research on the method to identify CT saturation based on dynamic virtual magnetic flux[J].Power System Protection and Control,2017,45(7):126-130.
[16]赵航,林湘宁,喻锟,等.基于模量Hausdorff距离波形比较的直流输电线路选择性快速保护方案[J].中国电机工程学报,2017,37(23):6888-6900.ZHAO Hang,LIN Xiangning,YU Kun,et al.A high-speed protection scheme for HVDC transmission line based on Hausdorff distance comparison[J].Proceedings of the CSEE,2017,37(23):6888-6900.
[17]曹京京.Hausdorff距离的计算原理及其在二维匹配中的应用[D].大连:大连理工大学,2013.CAO Jingjing.The calculation theory of Hausdorff distance and its application to the matching of 2Dgeometrical objects[D].Dalian:Dalian University of Technology,2013.
[18]翁汉琍,刘华,林湘宁,等.基于Hausdorff距离算法的变压器差动保护新判据[J].中国电机工程学报,2018,38(2):475-483.WENG Hanli,LIU Hua,LIN Xiangning,et al.A novel criterion of the transformer differential protection based on the Hausdorff distance algorithm[J].Proceedings of the CSEE,2018,38(2):475-483.
[19]陈乐,薄志谦,林湘宁,等.基于波形相似度比较的线路快速纵联保护研究[J].中国电机工程学报,2017,37(17):5018-5027.CHEN Le,BO Zhiqian,LIN Xiangning,et al.Waveform similarity comparison based high-speed pilot protection for transmission line[J].Proceedings of the CSEE,2017,37(17):5018-5027.
[20]谷君,郑涛,黄少锋,等.变压器外部故障切除后差动保护误动原因及防止对策[J].中国电机工程学报,2009,29(16):49-55.GU Jun,ZHENG Tao, HUANG Shaofeng,et al.Maloperation of transformer differential protection after removal of731external fault and countermeasure[J].Proceedings of the CSEE,2009,29(16):49-55.
[21]袁宇波,陆于平,许扬,等.切除外部故障时电流互感器局部暂态饱和对变压器差动保护的影响及对策[J].中国电机工程学报,2005,25(10):12-17.YUAN Yubo,LU Yuping,XU Yang,et al.The influence and countermeasure to transformer differential protection of CT partial transient saturation caused by external fault removal[J].Proceedings of the CSEE,2005,25(10):12-17.