一种抽能型高抗的抽能绕组匝间短路保护方案研究
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摘要
抽能型高压并联电抗器,简称抽能高抗,实质是一台由网侧绕组和抽能绕组构成的空心型变压器,属于一种既能吸收系统多余无功也能提供站用电源的新型电抗器。目前,工程上通常采用抽能绕组过电流或零序过电流保护反映抽能绕组的匝间短路故障,存在着选择性差、动作时间长等不足。因此,提出一种新型的抽能绕组匝间短路保护方案以解决这一问题,即综合采用抽能高抗网侧绕组的电压和电流以及抽能绕组环内电流等电气量,由区外异常判据、铁芯饱和判据和自产零序过流判据以逻辑相与的方式共同构成。RTDS仿真实验表明,该保护方案,既能保证在各种非区内故障工况下可靠不动作,又能灵敏反映抽能绕组4%匝以上的匝间短路故障,并将保护动作时间缩短至50 ms左右,解决了以往抽能绕组匝间短路保护方案选择性差、动作时间长等问题。
The power extraction high voltage parallel reactor,referred to as energy extraction reactor,is essentially a hollow transformer consisting of grid-side windings and auxiliary windings. It belongs to a new type of reactor which can absorb the redundant reactive power of the system and provide the power supply for the station. At present,over-current or zero-sequence over-current protection is usually used in engineering to reflect the inter-turn short-circuit fault of the auxiliary windings. This protection scheme has some shortcomings,such as poor selectivity and long operation time. Therefore,in this paper,a new scheme of inter-turn winding short circuit protection for energy extraction reactor was proposed. The scheme integrates the voltage and current of the high reactance winding on the grid side and the current in the winding ring. It consists of the criterion of out-of-zone anomaly,the criterion of core saturation and the criterion of self-produced zero-sequence overcurrent in a logical phase. RTDS simulation results show that the protection scheme can not only ensure reliable operation under various nonregional fault conditions,but also reflect inter-turn short circuit fault of auxiliary winding more than 4%,and shorten the protection operation time to about 50 ms,thus solving the problems of poor selectivity and long operation time of previous interturn short circuit protection schemes for auxiliary winding.
The power extraction high voltage parallel reactor,referred to as energy extraction reactor,is essentially a hollow transformer consisting of grid-side windings and auxiliary windings. It belongs to a new type of reactor which can absorb the redundant reactive power of the system and provide the power supply for the station. At present,over-current or zero-sequence over-current protection is usually used in engineering to reflect the inter-turn short-circuit fault of the auxiliary windings. This protection scheme has some shortcomings,such as poor selectivity and long operation time. Therefore,in this paper,a new scheme of inter-turn winding short circuit protection for energy extraction reactor was proposed. The scheme integrates the voltage and current of the high reactance winding on the grid side and the current in the winding ring. It consists of the criterion of out-of-zone anomaly,the criterion of core saturation and the criterion of self-produced zero-sequence overcurrent in a logical phase. RTDS simulation results show that the protection scheme can not only ensure reliable operation under various nonregional fault conditions,but also reflect inter-turn short circuit fault of auxiliary winding more than 4%,and shorten the protection operation time to about 50 ms,thus solving the problems of poor selectivity and long operation time of previous interturn short circuit protection schemes for auxiliary winding.
引文
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[17]童力,何立群,赵建文,等.基于SOGI-PLL锁相技术的磁阀式可控电抗器运行特性研究[J].浙江电力,2018,37(4):14-18.TONG Li,HE Liqun,ZHAO Jianwen,et al.Investigation on operation characteristics of magnetic-valve controllable reactor based on SOGI-PLL[J].Zhejiang Electric Power,2018,37(4):14-18.
[18]朱铭炼,姜田贵,欧阳有鹏,等.模块化多电平换流器直流双极短路故障耐受能力研究[J].电力工程技术,2018,37(2):44-48,60.ZHU Minglian,JIANG Tiangui,OUYANG Youpeng,et al.Current distribution and junction temperature calculation of protective thyristor for MMC valve[J].Electric Power Engineering Technology,2018,37(2):44-48,60.
[19]尹刚,彭勇.500 k V抽能并联电抗器的匝间短路保护[J].电网技术,2012,11(2):227-231.YING Gang,PENG Yong.Turn-to-turn faults protection of 500k V energy extraction shunt reactor[J].Power System Technology,2012,11(2):227-231.
[20]莫品豪,文继锋,鲍斌,等.分级可控型高抗控制绕组的匝间保护研究[J].电力系统自动化,2016,40(14):105-107.MO Pinhao,WEN Jifeng,BAO Bin,et al.Inter-turn protection for control winding of high-voltage step controlled shunt reactor[J].Automation of Electric Power Systems,2016,40(14):105-107.
[21]陈卫,陈德树,尹项根,等.基于零序幅值比较的电抗器匝间保护[J].电力系统及其自动化学报,2006,18(4):41-44.CHEN Wei,CHEN Deshu,YIN Xianggen,et al.Investigation of shunt reactor inter-turn protection based on zero sequence magnitude comparison[J].Proceedings of the CSU-EPSA,2006,18(4):41-44.
[2]李世雄.500 k V抽能并联电抗器在湖北鱼峡开关站的应用[J].湖北电力,2009,33(S1):87-90.LI Shixiong.Application of 500 k V shunt reactors with auxiliary winding system in switching station of Hubei Yuxia[J].Hubei Electric Power,2009,33(S1):87-90.
[3]白元强.500 k V抽能电抗器结构[J].江苏电机工程,2000,19(3):15-18.BAI Yuanqiang.The constraction of 500 k V energy extraction shunt reactor[J].Jiangsu Electrical Enginerring,2010,19(3):15-18.
[4]张进德,曾鹏,邓皓元,等.500 k V抽能并联电抗器-6 k V所用变系统运行分析[J].湖北电力,2010,34(5):36-38.ZHANG Jinde,ZENG Peng,DENG Haoyuan,et al.Operation analysis of 500 k V energy extraction shunt reactor 6 k Vauxiliary transformer system[J].Hubei Electric Power,2010,34(5):36-38.
[5]郑一鸣,孙翔,张建平,等.振动监测方法在特高压电抗器缺陷分析中的应用[J].浙江电力,2018,37(1):27-31.ZHENG Yiming,SUN Xiang,ZHANG Jianping,et al.Application of vibration monitoring method in defect analysis of ultra-high voltage reactor[J].Zhejiang Electric Power,2018,37(1):27-31.
[6]童力,赵建文,戴哲仁,等.基于MATLAB的磁阀式可控电抗器仿真技术研究[J].浙江电力,2018,37(7):49-55.TONG Li,ZHAO Jianwen,DAI Zheren,et al.Study of magneticvalve controllable reactor simulation technology based on MAT-LAB[J].Zhejiang Electric Power,2018,37(7):49-55.
[7]恩斯特·克诺尔.带有抽能线圈系统的电抗器[J].国际电力,1998,1(1):56-57.KNOLL E.The shunt reactor with auxiliary winding[J].International Power,1998,1(1):56-57.
[8]谭黎军,龚筱琦,苏钟焕,等.500 k V抽能并联电抗器空_负载特性研究[J].变压器,2015,52(10):33-37.TAN Lijun,GONG Xiaoqi,SU Zhonghuan,et al.No-load and load characteristics research of 500 k V shunt reactor with transformer function[J].Transformer,2015,52(10):33-37.
[9]李惠琪,崔翔,李琳,等.带抽能线圈并联铁心电抗器的分析[J].电工技术学报,2004,19(12):15-19.LI Huiqi,CUI Xiang,LI Lin,et al.Analysis of high-voltage shunt reactor with auxiliary winding system[J].Transactions of China Electro technical Society,2004,19(12):15-19.
[10]程范卿.磁阀式可控电抗器保护研究[D].北京:华北电力大学,2009.CHENG Fanqing.Protection study of magnetic value controllable reactors[D].Beijing:North China Electric Power University,2009.
[11]ALEKSANDROV G N.Controllable shunting reactor of Transformer type[J].IEEE Trans on Industrial Electronics,1991,38(6):439-445.
[12]田铬兴,励庆孚.变压器式可控电抗器的磁场和参数计算[J].西安交通大学学报,2005,39(6):656-658.TIAN Mingxing,LI Qingfu.Calculation of magnetic flux and parameters of reactor of transformer type[J].Journal of Xi'an Jiaotong University,2005,39(6):656-658.
[13]田翠华,陈柏超.可控电抗器在西北750 k V系统中的应用[J].高电压技术,2005,31(3):18-21.TIAN Cuihua,CHEN Baichao.Application of controlled reactor in Northwest 750 k V power system[J].High Voltage Engineering,2005,31(3):18-21.
[14]田铬兴,励庆孚.变压器式可控电抗器的谐波分析和功率级数计算[J].中国电机工程学报,2003,23(8):168-171.TIAN Mingxing,LI Qingfu.Harmonic current and power-stepnumber of controllable shunting reactors of transformer type[J].Proceedings of the CSEE,2003,23(8):168-171.
[15]陈松林,王志鸿,郑玉平,等.新型微机电抗器保护的研制与开发[J].电力系统自动化,2003,27(24):70-73.CHEN Songlin,WANG Zhihong,ZHENG Yuping,et al.Research&development of a new digital shunt reator Protection[J].Automation of Electric Power Systems,2003,27(24):70-73.
[16]陈聪,陶悦玥,罗潇,等.高抗抽能绕组保护配置改进方法[J].湖北电力,2017,41(5):7-9.CHEN Cong,TAO Yueyue,LUO Xiao,et al.Improved protection for high-voltage shunt reactor with auxiliary winding system[J].Hubei Electric Power,2017,41(5):7-9.
[17]童力,何立群,赵建文,等.基于SOGI-PLL锁相技术的磁阀式可控电抗器运行特性研究[J].浙江电力,2018,37(4):14-18.TONG Li,HE Liqun,ZHAO Jianwen,et al.Investigation on operation characteristics of magnetic-valve controllable reactor based on SOGI-PLL[J].Zhejiang Electric Power,2018,37(4):14-18.
[18]朱铭炼,姜田贵,欧阳有鹏,等.模块化多电平换流器直流双极短路故障耐受能力研究[J].电力工程技术,2018,37(2):44-48,60.ZHU Minglian,JIANG Tiangui,OUYANG Youpeng,et al.Current distribution and junction temperature calculation of protective thyristor for MMC valve[J].Electric Power Engineering Technology,2018,37(2):44-48,60.
[19]尹刚,彭勇.500 k V抽能并联电抗器的匝间短路保护[J].电网技术,2012,11(2):227-231.YING Gang,PENG Yong.Turn-to-turn faults protection of 500k V energy extraction shunt reactor[J].Power System Technology,2012,11(2):227-231.
[20]莫品豪,文继锋,鲍斌,等.分级可控型高抗控制绕组的匝间保护研究[J].电力系统自动化,2016,40(14):105-107.MO Pinhao,WEN Jifeng,BAO Bin,et al.Inter-turn protection for control winding of high-voltage step controlled shunt reactor[J].Automation of Electric Power Systems,2016,40(14):105-107.
[21]陈卫,陈德树,尹项根,等.基于零序幅值比较的电抗器匝间保护[J].电力系统及其自动化学报,2006,18(4):41-44.CHEN Wei,CHEN Deshu,YIN Xianggen,et al.Investigation of shunt reactor inter-turn protection based on zero sequence magnitude comparison[J].Proceedings of the CSU-EPSA,2006,18(4):41-44.