基于故障分量瞬时功率相空间轨迹识别的线路纵联保护新原理
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摘要
纵联差动保护具有高选择性、全线速动的优点,广泛应用于220kV及以上高压输电线路,其动作性能显著优于其他纵联主保护,在现场应用中逐渐居主导地位。但是,采样数据同步对时误差、可控高抗补偿度不确定等因素将对该保护的性能产生较大的不利影响。针对上述问题,基于相空间轨迹识别的思路,提出一种具备抗同步对时误差能力的线路纵联保护新原理:首先从理论上验证了相空间重构法应用于线路保护的可行性,选取故障分量瞬时功率作为重构相空间的一维时间序列,分析了系统不同工况下相空间轨迹的变化规律,进而设计了一种基于相空间轨迹识别的线路纵联保护新判据。基于PSCAD/EMTDC的仿真结果表明,所提新判据具有免整定、超快速动作,不受并联电抗器补偿度不确定影响,基本不受两侧数据失步影响,以及耐受高过渡电阻等优点。
Pilot differential protection is with high selectivity and speed and widely used in 220 kV and above high voltage transmission line, which is significantly superior to other pilot protections and occupies the leading position in the field application. However, the synchronization error and uncertainty of controllable high resistance compensation degree have a great adverse effect on the performance of the protection. To deal with above problems, a novel principle of line pilot protection based on the recognition of phase space trajectory with synchronization error tolerating ability was proposed in this paper. Firstly, the possibility of applying phase space reconstruction method to the line protection was analyzed. Then fault component instantaneous power was selected as one dimensional time series of phase space, the phase space trajectory variation characteristic under different condition was analyzed and finally a new line pilot protection criterion based on the recognition of phase space trajectory was proposed. PSCAD/EMTDC based simulation results verifies that the proposed criterion has the advantages of no setting,high speed, high transition resistance tolerating ability, and it is barely influenced by the compensation degree of shunt reactors and asynchrony of two side data.
Pilot differential protection is with high selectivity and speed and widely used in 220 kV and above high voltage transmission line, which is significantly superior to other pilot protections and occupies the leading position in the field application. However, the synchronization error and uncertainty of controllable high resistance compensation degree have a great adverse effect on the performance of the protection. To deal with above problems, a novel principle of line pilot protection based on the recognition of phase space trajectory with synchronization error tolerating ability was proposed in this paper. Firstly, the possibility of applying phase space reconstruction method to the line protection was analyzed. Then fault component instantaneous power was selected as one dimensional time series of phase space, the phase space trajectory variation characteristic under different condition was analyzed and finally a new line pilot protection criterion based on the recognition of phase space trajectory was proposed. PSCAD/EMTDC based simulation results verifies that the proposed criterion has the advantages of no setting,high speed, high transition resistance tolerating ability, and it is barely influenced by the compensation degree of shunt reactors and asynchrony of two side data.
引文
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[18]郑涛,刘万顺,吴春华,等.基于瞬时功率的变压器励磁涌流和内部故障电流识别新方法[J].电力系统自动化,2003,27(23):51-55.Zheng Tao,Liu Wanshun,Wu Chunhua,et al.A new approach and internal to the discrimination between inrush-current fault current based on instantaneous power[J].Automation of Electric Power Systems,2003,27(23):51-55(in Chinese).
[19]陈德树,尹项根,张哲,等.故障分量差动保护与故障变化量差动保护[J].电力系统自动化,2008,32(9):39-41.Chen Deshu,Yin Xianggen,Zhang Zhe,et al.Fault component differential protection and fault variation component differential protection[J].Automation of Electric Power Systems,2008,32(9):39-41(in Chinese).
[20]刘凯,索南加乐,邓旭阳,等.基于故障分量正序、负序和零序综合阻抗的线路纵联保护新原理[J].电力自动化设备,2010,30(4):21-25.Liu Kai,Suonan Jiale,Deng Xuyang,et al.Principle of pilot line impedance protection based on integrated of fault component[J].Electric Power Automation Equipment,2010,30(4):21-25(in Chinese).
[2]朱国防,陆于平.线路差动保护的相移制动能力研究[J].中国电机工程学报,2009,29(10):84-90.Zhu Guofang,Lu Yuping.Studies on phase shift restraint capacity of feeder current differential protection[J].Proceedings of the CSEE,2009,29(10):84-90(in Chinese).
[3]曹团结,马锁明,许捷,等.线路电荷变化量差动保护[J].电力系统自动化,2013,37(23):102-107.Cao Tuanjie,Ma Suoming,Xu Jie,et al.Change-of-charge differential protection of transmission lines[J].Automation of Electric Power Systems,2013,37(23):102-107(in Chinese).
[4]Darwish H A,Taalab A M I,Ahmed E S.Investigation of power differential concept for line protection[J].IEEETransactions on Power Delivery,2005,20(2):617-624.
[5]Taalab A M I,Darwish H A,Ahmed E S.Performance of power differential relay with adaptive setting for line protection[J].IEEE Transactions on Power Delivery,2007,22(1):50-58.
[6]黄家凯,高厚磊,彭放,等.输电线路虚拟有功功率差动保护[J].电力系统自动化,2017,41(14):190-196.Huang Jiakai,Gao Houlei,Peng Fang,et al.Virtual active power differential protection for transmission lines[J].Automation of Electric Power Systems,2017,41(14):190-196(in Chinese).
[7]刘世明,许志成,李森林,等.基于相空间的励磁涌流新特征分析[J].电力系统自动化,2012,36(18):134-138.Liu Shiming,Xu Zhicheng,Li Senlin,et al.A novel characteristic of magnetizing inrush current based on phase space[J].Automation of Electric Power Systems,2012,36(18):134-138(in Chinese).
[8]Dubey R,Samantaray S R,Panigrahiand B K,et al.Phase-space-based symmetrical fault detection during power swing[J].IET Generation,Transmission&Distribution,2016,10(8):1947-1956,.
[9]Samantaray S R.Phase-space-based fault detection in distance relaying[J].IEEE Transactions on Power Delivery,2011,26(1):33-41.
[10]Baker G L,Gollub J P.Chaotic Dynamics:An Introduction[M].Cambridge,U.K.:Cambridge University Press,1990.
[11]Takens F.Detecting strange atractors in turbulence,in lecture notes in mathematics[M].Berlin,Germany:Springer Berlin/Heidelberg,1981:366-381.
[12]Sauer T,Yorke J A,Casdagli M.Embedology[J].Journal of Statistical Physics,1991,65(3-4):579-616.
[13]Grassberger P,Procaccia I.Estimation of the Kolmogorov entropy from a chaotic signal[J].Physical Review A,1983,28(4):2591-2593.
[14]Namdari F,Jamali S,Crossley P A.Power differential protection as primary[C]//2008 IET 9th International Conference on Developments in Power System Protection(DPSP 2008),Glasgow,2008:80-85.
[15]李捷,苗世洪,刘沛,等.基于分相有功功率差动原理的线路高阻接地保护判据[J].电网技术,2011,35(8):197-201.Li Jie,Miao Shihong,Liu Pei,et al.A protection criterion for high resistance grounding of transmission line based on phase-segregated active power differential principle[J].Power System Technology,2011,35(8):197-201(in Chinese).
[16]邓翔天,袁荣湘,肖振锋,等.基于瞬时功率理论的输电线路分相电流差动保护[J].电力自动化设备,2014,34(11):82-88.Deng Xiangtian,Yuan Rongxiang,Xiao Zhenfeng,et al.Split-phase differential current protection based on instantaneous power theory for power transmission line[J].Electric Power Automation Equipment,2014,34(11):82-88(in Chinese).
[17]马静,王增平,吴劼.基于广义瞬时功率的新型变压器保护原理[J].中国电机工程学报,2008,28(13):78-83.Ma Jing,Wang Zengping,Wu Jie.A novel principle of transformer protection based on generalized instantaneous power[J].Proceedings of the CSEE,2008,28(13):78-83(in Chinese).
[18]郑涛,刘万顺,吴春华,等.基于瞬时功率的变压器励磁涌流和内部故障电流识别新方法[J].电力系统自动化,2003,27(23):51-55.Zheng Tao,Liu Wanshun,Wu Chunhua,et al.A new approach and internal to the discrimination between inrush-current fault current based on instantaneous power[J].Automation of Electric Power Systems,2003,27(23):51-55(in Chinese).
[19]陈德树,尹项根,张哲,等.故障分量差动保护与故障变化量差动保护[J].电力系统自动化,2008,32(9):39-41.Chen Deshu,Yin Xianggen,Zhang Zhe,et al.Fault component differential protection and fault variation component differential protection[J].Automation of Electric Power Systems,2008,32(9):39-41(in Chinese).
[20]刘凯,索南加乐,邓旭阳,等.基于故障分量正序、负序和零序综合阻抗的线路纵联保护新原理[J].电力自动化设备,2010,30(4):21-25.Liu Kai,Suonan Jiale,Deng Xuyang,et al.Principle of pilot line impedance protection based on integrated of fault component[J].Electric Power Automation Equipment,2010,30(4):21-25(in Chinese).