基于改进Hausdorff距离算法的发变组大差保护新原理
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摘要
发变组大差动保护属于保护双重化中主保护的一种,传统发变组大差保护动作速度慢且易受电流互感器饱和影响。对此,提出了一种兼备速动性及抗饱和特性的基于改进Hausdorff距离算法的发变组大差保护新判据。首先分析了改进Hausdorff距离算法的基本原理:在发变组区内故障时,由各端电流构造的Hausdorff距离值较大;在区外故障及正常运行时,由各端电流构造的Hausdorff距离值较小,基本为0。基于此原理提出了发变组大差保护新判据,并给出了门槛值整定方案。另外,提出了电流互感器饱和识别及保护再开放策略。理论分析和仿真结果验证了所提保护方案的有效性,能快速可靠识别区内故障,在区外故障饱和情况下可靠闭锁,再次发生转换性故障时也能快速开放,且判据门槛值整定简单,不受系统参数的影响。
The large differential protection of generator-transformer unit is one of the dual main protections. The traditional large differential protection of generator-transformer unit is easy to be influenced by current transformer saturation and the operation is slow. To dealing with above problems, a new criterion for large difference protection of generator-transformer unit based on improved Hausdorff Distance algorithm is proposed, which has high operation speed and anti-saturation capability. Firstly, the basic principle of the Hausdorff Distance algorithm is analyzed: when the fault occurs within the generator-transformer unit, the Hausdorff Distance constructed by the current of each terminal is big; when the fault is outside the generator-transformer unit or the system is under normal operation, the Hausdorff Distance constructed by the current of each terminal is smaller, which is basically 0. Based on this principle, a new criterion for the large difference protection of generator-transformer unit is proposed, and the threshold setting scheme is proposed. In addition, the current transformer saturation recognition strategy and protection opening strategy are proposed. Theoretical analysis and simulation results verify the effectiveness of the proposed protection scheme, which can quickly identify the internal fault and be reliably locked under external fault with current transformer saturation, can quickly open again under converted fault. The threshold value setting process is simple and not affected by system parameters.
The large differential protection of generator-transformer unit is one of the dual main protections. The traditional large differential protection of generator-transformer unit is easy to be influenced by current transformer saturation and the operation is slow. To dealing with above problems, a new criterion for large difference protection of generator-transformer unit based on improved Hausdorff Distance algorithm is proposed, which has high operation speed and anti-saturation capability. Firstly, the basic principle of the Hausdorff Distance algorithm is analyzed: when the fault occurs within the generator-transformer unit, the Hausdorff Distance constructed by the current of each terminal is big; when the fault is outside the generator-transformer unit or the system is under normal operation, the Hausdorff Distance constructed by the current of each terminal is smaller, which is basically 0. Based on this principle, a new criterion for the large difference protection of generator-transformer unit is proposed, and the threshold setting scheme is proposed. In addition, the current transformer saturation recognition strategy and protection opening strategy are proposed. Theoretical analysis and simulation results verify the effectiveness of the proposed protection scheme, which can quickly identify the internal fault and be reliably locked under external fault with current transformer saturation, can quickly open again under converted fault. The threshold value setting process is simple and not affected by system parameters.
引文
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[19]戚宣威,李露,黄晓明,等.区外故障导致变压器电流互感器饱和及差动保护误动问题研究[J].电力系统保护与控制,2017,45(20):44-51.QI Xuanwei,LI Lu,HUANG Xiaoming,et al.Study on the CT saturation and mal-operation of the transformer current differential protection during external faults[J].Power System Protection and Control,2017,45(20):44-51.
[20]杜姣,陆于平,朱国防.幅值相位双判据变压器差动保护算法[J].中国电机工程学报,2010,30(16):79-85.DU Jiao,LU Yuping,ZHU Guofang.Differential protection algorithm with double criterions of amplitude and phase angle for transformer[J].Proceedings of the CSEE,2010,30(16):79-85.
[2]林湘宁,刘沛,高艳.基于故障暂态和数学形态学的超高速线路方向保护[J].中国电机工程学报,2005,25(4):13-18.LIN Xiangning,LIU Pei,GAO Yan.Ultra-high-speed line directional protection based on transient and mathematical morphology[J].Proceedings of the CSEE,2005,25(4):13-18.
[3]林湘宁,刘沛,刘世明,等.电力系统超高速保护的形态学-小波综合滤波算法[J].中国电机工程学报,2002,22(9):19-24.LIN Xiangning,LIU Pei,LIU Shiming,et al.A novel integrated morphology-wavelet filter algorithm used for ultra-high-speed protection of power systems[J].Proceedings of the CSEE,2002,22(9):19-24.
[4]孙庆森,张海峰,王猛,等.小波算法在变压器励磁涌流中的应用研究[J].电力系统保护与控制,2017,45(8):121-125.SUN Qingsen,ZHANG Haifeng,WANG Meng,et al.Application of wavelet algorithm in the transformer inrush current[J].Power System Protection and Control,2017,45(8):121-125.
[5]黄南天,李富青,王文婷,等.输电线路故障层次化变步长Tsallis小波奇异熵诊断方法[J].电力系统保护与控制,2017,45(18):38-44.HUANG Nantian,LI Fuqing,WANG Wenting,et al.Amethod of transmission line faults diagnosis based on Tsallis wavelet singular entropy with hierarchical variable step size[J].Power System Protection and Control,2017,45(18):38-44.
[6]张保会,郝治国.智能电网继电保护研究的进展(一)-故障甄别新原理[J].电力自动化设备,2010,30(1):1-6.ZHANG Baohui,HAO Zhiguo.Development of relay protection for smart grid(1):new principles of fault distinction[J].Automation of Electric Power Systems,2010,30(1):1-6.
[7]陈德树,马天皓,刘沛,等.采样值电流差动微机保护的一些问题[J].电力自动化设备,1996,16(4):3-8.CHEN Deshu,MA Tianhao,LIU Pei,et al.Problems in realization of microcomputer based differential current protection by sampled values[J].Electric Power Automation Equipment,1996,16(4):3-8.
[8]钟显,樊艳芳,王一波.双馈集群汇集站主变及送出线路继电保护研究[J].电力系统保护与控制,2016,44(5):47-54.ZHONG Xian,FAN Yanfang,WANG Yibo.Research of transformer and outgoing line protection of collection station where cluster of double-fed wind farms put in[J].Power System Protection and Control,2016,44(5):47-54.
[9]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.
[10]胡玉峰,陈德树,尹项根.采样值差动及其应用[J].电力系统自动化,2000,24(10):40-44.HU Yufeng,CHEN Deshu,YIN Xianggen.New differential protection of power apparatus based on sampled values and its application[J].Automation of Electric Power Systems,2000,24(10):40-44.
[11]林湘宁,何战虎,刘世明,等.电流采样值差动保护若干问题的探讨[J].电力系统自动化,2001,25(19):27-33.LIN Xiangning,HE Zhanhu,LIU Shiming,et al.Discussions on some aspects of sampling value differential current protection[J].Automation of Electric Power Systems,2001,25(19):27-33.
[12]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.
[13]谷君,郑涛,肖仕武,等.基于时差法的Y/△接线变压器和应涌流鉴别新方法[J].中国电机工程学报,2007,27(13):6-11.GU Jun,ZHENG Tao,XIAO Shiwu,et al.A new algorithm based on time differential method to identify sympathetic inrush of transformers connected in wye-delta mode[J].Proceedings of the CSEE,2007,27(13):6-11.
[14]王业,陆于平,徐以超,等.基于动态时间弯曲的差动保护算法[J].中国电机工程学报,2012,32(28):133-141.WANG Ye,LU Yuping,XU Yichao,et al.A differential protection algorithm based on dynamic time warping[J].Proceedings of the CSEE,2012,32(28):133-141.
[15]WANG Anna,SUN Xiyan,ZHOU Xiaoxing,et al,Difference squared Hausdorff Distance based medical image registration[C]//Chinese Control and Decision Conference(CCDC),May 23-25,2011,Mianyang,China:4270-4272.
[16]练仕榴,郑刚,牟善玲.用于心电波形分析的相似性度量策略[J].计算机工程,2011,37(9):263-265.LIAN Shiliu,ZHENG Gang,MOU Shanling.Similarity measurement strategies for ECG waveform analysis[J].Computer Engineering,2011,37(9):263-265.
[17]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):1-9.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):1-9.
[18]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.Similarity comparison based high-speed pilot protection for transmission line[J].Proceedings of the CSEE,2017,37(17):5018-5027.
[19]戚宣威,李露,黄晓明,等.区外故障导致变压器电流互感器饱和及差动保护误动问题研究[J].电力系统保护与控制,2017,45(20):44-51.QI Xuanwei,LI Lu,HUANG Xiaoming,et al.Study on the CT saturation and mal-operation of the transformer current differential protection during external faults[J].Power System Protection and Control,2017,45(20):44-51.
[20]杜姣,陆于平,朱国防.幅值相位双判据变压器差动保护算法[J].中国电机工程学报,2010,30(16):79-85.DU Jiao,LU Yuping,ZHU Guofang.Differential protection algorithm with double criterions of amplitude and phase angle for transformer[J].Proceedings of the CSEE,2010,30(16):79-85.