一种基于虚拟电流制动量的电流差动保护
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摘要
为了减小负荷电流增加制动量对电流差动保护灵敏度的影响,提出了一种基于虚拟电流制动量的电流差动保护。首先比较线路两侧电流大小,利用两侧电流幅值比与相位关系构造虚拟电流,虚拟电流可以根据线路两侧电流幅值关系自适应调整制动量大小。与利用线路两侧电流相位差的制动量相比:区内故障时,虚拟电流制动量小于电流相位差制动量,提高了电流差动保护灵敏度;区外故障时,虚拟电流制动量等于电流相位差制动量,电流差动保护的可靠性不降低。同时分析了弱馈线路、串补线路电流反相两种情况下虚拟制动电流的适应性。利用RTDS建立仿真模型验证保护的动作性能。仿真结果表明,虚拟电流制动量可以有效提高电流差动保护的灵敏度和可靠性,同时具有良好的适应性。
In order to reduce the influence of load current on the sensitivity of current differential protection, a current differential protection based on virtual brake current is proposed. Comparing current sizes of transmission line firstly, then amplitude ratio and phase relationship of both side currents are used to construct the virtual current. The virtual current can adjust the braking size according to the current amplitude relationship on both sides of the line. Comparing to brake current using phase differences of line both side currents, virtual brake current is smaller than phase differences brake current for internal faults and it improves the sensitivity of zero current differential protection. Virtual brake current is equal to phase differences brake current for external faults and it doesn't reduce the reliability of zero current differential protection. its adaptation is analyzed for weak feeder line and current inverse for line with series compensation device. RTDS simulation results show that virtual braking current can improve the sensitivity and reliability of the current differential protection effectively. Its adaptability is good.
In order to reduce the influence of load current on the sensitivity of current differential protection, a current differential protection based on virtual brake current is proposed. Comparing current sizes of transmission line firstly, then amplitude ratio and phase relationship of both side currents are used to construct the virtual current. The virtual current can adjust the braking size according to the current amplitude relationship on both sides of the line. Comparing to brake current using phase differences of line both side currents, virtual brake current is smaller than phase differences brake current for internal faults and it improves the sensitivity of zero current differential protection. Virtual brake current is equal to phase differences brake current for external faults and it doesn't reduce the reliability of zero current differential protection. its adaptation is analyzed for weak feeder line and current inverse for line with series compensation device. RTDS simulation results show that virtual braking current can improve the sensitivity and reliability of the current differential protection effectively. Its adaptability is good.
引文
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[16]袁荣湘,陈德树,马天皓,等.基于相关分析的暂态电流差动保护的原理与性能研究[J].电网技术,2000,24(4):40-42.YUAN Rongxiang,CHEN Deshu,MA Tianhao,et al.Study on transient current differential protection based on correlation analysis[J].Power System Technology,2000,24(4):40-42.
[17]赵曙伟.变压器差动保护的补偿算法[J].智慧电力,2017,45(10):95-100.ZHAO Shuwei.Analysis of Compensation Algorithm for Transformer Differential Protection[J].Smart Power,2017,45(10):95-100.
[18]张尧,李玉平,陈实.分布式就地化变压器保护定值自整定的实现方案研究[J].智慧电力,2017,45(10):72-76.ZHANG Yao,LI Yuping CHEN Shi.Research on distributed on-site transformer protection self-setting solution[J].Smart Power,2017,45(10):72-76.
[19]刘毅,刘汉伟,梅涛.一种确定保护受串补电容影响区域的仿真方法[J].电力系统保护与控制,2016,44(4):84-90.LIU Yi,LIU Hanwei,MEI Tao.Simulation method of defining the area in which the distance protection affected by the series compensation capacitor[J].Power System Protection and Control,2016,44(4):84-90.
[20]闫旭,李春明.基于模糊逻辑的可控串补线路故障分类[J].电力系统保护与控制,2016,44(4):122-127.YAN Xu,LI Chunming.Fuzzy-logic-based fault classification in a series compensated transmission line[J].Power System Protection and Control,2016,44(4):122-127.
[2]柳焕章,李晓华.新型数字线路电流差动保护原理及其应用[J].电网技术,2007,31(11):74-81.LIU Huanzhang,LI Xiaohua.A novel principle of digital current differential protection for transmission line and its application[J].Power System Technology,2007,31(11):74-81.
[3]李晓华,柳焕章,尹项根,等.新型双K值差动保护研究[J].中国电机工程学报,2007,27(25):49-55.LI Xiaohua,LIU Huanzhang,YIN Xianggen,et al.Novel differential protection with double restraint coefficient[J].Proceedings of the CSEE,2007,27(25):49-55.
[4]李斌,范瑞卿,于绚,等.相位相关电流差动保护新原理[J].中国电机工程学报,2011,31(7):96-101.LI Bin,FAN Ruiqing,YU Xuan,et al.A novel principle of phase related current differential protection[J].Proceedings of the CSEE,2011,31(7):96-101.
[5]马文龙,郭效军,王文雄,等.一种超高压输电线路自适应分相电流差动保护新原理研究[J].电力自动化设备,2004,24(12):12-15.MA Wenlong,GUO Xiaojun,WANG Wenxing,et al.Study on new principle of adaptive current differential protection for EHV transmission line[J].Electric Power Automation Equipment,2004,24(12):12-15.
[6]吴继维,童晓阳,廖小君,等.基于零序差动阻抗的输电线路保护新原理研究[J].电力系统保护与控制,2017,45(10):11-17.WU Jiwei,TONG Xiaoyang,LIAO Xiaojun,et al.Transmission line protection principle based on zero sequence differential impedance[J].Power System Protection and Control,2017,45(10):11-17.
[7]Xianggen Yin,Zhe Zhang,Zhenxing Li,et al.The research and the development of the wide area relaying protection based on fault element identification[J].Protection and Control of Modern Power Systems,2016,1(1):95-107.DOI:10.1186/s41601-016-0023-z.
[8]赵萍,裘愉涛,徐华,等.适用于多点T接的新型电流差动保护[J].电力系统保护与控制,2017,45(20):152-157.ZHAO Ping,QIU Yutao,XU Hua,et al.A new current differential relay scheme for multi“T”nodes transmission line[J].Power System Protection and Control,2017,45(20):152-157.
[9]黄景光,梅李鹏,林湘宁,等.故障行波特性对光纤差动保护时延的影响分析[J].电力系统保护与控制,2016,44(7):76-82.HUANG Jingguang,MEI Lipeng,LIN Xiangning,et al.Influence on the optical fiber differential protection delay based on characteristic of fault traveling wave[J].Power System Protection and Control,2016,44(7):76-82.
[10]王秀莲,崔云龙,胡广.光伏并网系统送出线路不对称故障的差动保护灵敏度研究[J].电力系统保护与控制,2017,45(21):20-26.WANG Xiulian,CUI Yunlong,HU Guang.Sensitivity studies on differential protection during the output line of grid-connected photovoltaic systems occur asymmetrical faults[J].Power System Protection and Control,2017,45(21):20-26.
[11]柳焕章,周泽昕,周春霞,等.输电线路突变量电流差动继电器[J].中国电机工程学报,2013,33(1):146-152.LIU Huanzhang,ZHOU Zexin,ZHOU Chunxia,et al.Current differential relay of transmission lines based on incremental quantity[J].Proceedings of the CSEE,2013,33(1):146-152.
[12]林湘宁,刘沛.全电流与故障分量电流比例差动判据的比较研究[J].中国电机工程学报,2004,24(10):27-31.LIN Xiangning,LIU Pei.Comparative studies on percentage differential criteria using phase current and superimposed pahse current[J].Proceedings of the CSEE,2004,24(10):27-31.
[13]林湘宁,何战虎,刘世明,等.复式电流比例差动保护判据的可靠性评估[J].中国电机工程学报,2001,21(7):98-102.LIN Xiangning,HE Zhanhu,LIU Shiming,et al.Reliability evaluations on complex current percentage differential criterion[J].Proceedings of the CSEE,2001,21(7):98-102.
[14]李晓华,张哲,尹项根,等.故障分量比率差动保护整定值的选取[J].电网技术,2001,25(4):47-50.LI Xiaohua,ZHANG Zhe,YING Xianggen,et al.Selection of settings of differential protection based on fault component[J].Power system technology,2001,25(4):47-50.
[15]尹项根,邰能灵,杨书富.标积制动量的应用与分析[J].中国电机工程学报,2000,20(1):85-88.YING Xianggen,TAI Nengling,YANG Shufu.The application and analysis of the differential protection with the product-restraint quantity[J].Proceedings of the CSEE,2000,20(1):85-88.
[16]袁荣湘,陈德树,马天皓,等.基于相关分析的暂态电流差动保护的原理与性能研究[J].电网技术,2000,24(4):40-42.YUAN Rongxiang,CHEN Deshu,MA Tianhao,et al.Study on transient current differential protection based on correlation analysis[J].Power System Technology,2000,24(4):40-42.
[17]赵曙伟.变压器差动保护的补偿算法[J].智慧电力,2017,45(10):95-100.ZHAO Shuwei.Analysis of Compensation Algorithm for Transformer Differential Protection[J].Smart Power,2017,45(10):95-100.
[18]张尧,李玉平,陈实.分布式就地化变压器保护定值自整定的实现方案研究[J].智慧电力,2017,45(10):72-76.ZHANG Yao,LI Yuping CHEN Shi.Research on distributed on-site transformer protection self-setting solution[J].Smart Power,2017,45(10):72-76.
[19]刘毅,刘汉伟,梅涛.一种确定保护受串补电容影响区域的仿真方法[J].电力系统保护与控制,2016,44(4):84-90.LIU Yi,LIU Hanwei,MEI Tao.Simulation method of defining the area in which the distance protection affected by the series compensation capacitor[J].Power System Protection and Control,2016,44(4):84-90.
[20]闫旭,李春明.基于模糊逻辑的可控串补线路故障分类[J].电力系统保护与控制,2016,44(4):122-127.YAN Xu,LI Chunming.Fuzzy-logic-based fault classification in a series compensated transmission line[J].Power System Protection and Control,2016,44(4):122-127.