母线采样值差动保护数据窗选取方法研究
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摘要
采样值差动保护动作行为的正确性取决于数据窗选取的准确性。文中基于电流互感器(current transformer,CT)的磁滞特性,分别对母差区内外故障情况下制动电流与差动电流瞬时值和变化率的特征进行分析,在此基础上,提出一种应用于母线采样值差动保护的数据窗选取方法:首先选取数据窗特征点,再由数据窗特征点倒推数据窗起始点,并进行了实时数字仿真(real time digital simulation,RTDS)验证。本采样值差动保护原理不受系统频率、电流非周期分量及CT传变特性等影响,在区外转区内复杂故障情况下,依然可以保证差动保护动作的快速性和可靠性,数据窗选取方法精准可靠,提高了采样值差动保护动作的灵敏性。
The correctness of the sampled value differential protection behavior depends on the accuracy of the data window selection. Based on the hysteresis characteristics of the current transformer( CT),this paper analyzes instantaneous value and the rate of change of restraint current and differential current under the situation of busbar internal and external faults,and puts forward a data window selection method for sampled value differential protection: first select feather point of data window,then by the feather point to push down the starting point of data window,and RTDS test is carried out to verification the principle.The sampled value differential protection principle is not affected by the system frequency,the non-periodic current and CT transfer characteristics and so on,and it can still guarantee the reliability and rapidity in the complex fault condition,data window selection method is accurate and reliable,improves the sensitivity of sampled value differential protection action.
The correctness of the sampled value differential protection behavior depends on the accuracy of the data window selection. Based on the hysteresis characteristics of the current transformer( CT),this paper analyzes instantaneous value and the rate of change of restraint current and differential current under the situation of busbar internal and external faults,and puts forward a data window selection method for sampled value differential protection: first select feather point of data window,then by the feather point to push down the starting point of data window,and RTDS test is carried out to verification the principle.The sampled value differential protection principle is not affected by the system frequency,the non-periodic current and CT transfer characteristics and so on,and it can still guarantee the reliability and rapidity in the complex fault condition,data window selection method is accurate and reliable,improves the sensitivity of sampled value differential protection action.
引文
[1]薛蓉.多采样率转换算法对差动保护的应用研究[J].电力工程技术,2014,33(5):62-65.XUE Rong.Research on the impacts of multi-Rate conversion algorithm on differential protection[J].Electric Power Engineering Technology,2014,33(5):62-65.
[2]刘志仁,殷志.电流互感器饱和导致保护拒动事故的分析[J].电力工程技术,2016,35(4):84-86.LIU Zhiren,YIN Zhi.Analysis of protective action resistance accidents caused by current transformer saturation[J].Electric Power Engineering Technology,2016,35(4):84-86.
[3]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(10):40-44.HU Yufeng,CHEN Deshu,YIN Xianggen.New differential protection of power apparatus based on sampled value and its application[J].Automation of Electric Power Systems,2000(10):40-44.
[4]黄继东,倪传坤,郭文利,等.母线保护区外转区内故障再动作判据[J].电力系统自动化,2014,38(18):120-124.HUANG Jidong,NI Chuankun,GUO Wenli,et al.Re-tripping discrimination of busbar differential protection when external fault transforms internal faule[J].Automation of Electric Power Systems,2014,38(18):120-124.
[5]张雪梅,李湛.线路故障引起母差保护异常动作的分析[J].电力工程技术,2016,35(5):88-89.ZHANG Xuemei,LI Zhan.Analysis of abnormal action of bus differential protection caused by line fault[J].Electric Power Engineering Technology,2016,35(5):88-89.
[6]李肖博,谭凌,揭萍,等.基于虚拟电流波形特征的母线保护原理[J].电力系统自动化,2015,39(16):115-119.LI Xiaobo,TAN Ling,JIE Ping,et al.An algorithm based on virtual current for busbar protection[J].Automation of Electric Power System,2015,39(16):115-119.
[7]吴崇昊,陆于平,刘小宝,等.基于电流互感器线性传变区检测的母线采样值差动保护[J].电网技术,2008,32(14):70-73.WU Chonghao,LU Yuping,LIU Xiaobao,et al.Busbar sampled value differential protection based on linear transfer section checking of TA[J].Power System Technology,2008,32(14):70-73.
[8]徐晓春,刘革明,戴光武,等.3/2开关接线方式下基于能量制动的抗电流互感器饱和措施[J].电力系统自动化,2016,40(12):189-193.XU Xiaochun,LIU Geming,DAI Guangwu,et al.Energy resistance based anti-saturation scheme with breaker-and-a-half configuration[J].Automation of Electric Power System,2016,40(2):189-193.
[9]杜丁香,周泽昕,王兴国,等.克服母线差动保护汲出电流的对策[J].电力系统自动化,2014,38(24):86-90.DU Dingxiang,ZHOU Zexin,WANG Xingguo,et al.Countermeasures to overcome outflow current for busbar differential protection[J].Automation of Electric Power System,2014,38(24):86-90.
[10]赵永彬,陆于平.一种基于异步法的母线保护中电流互感器饱和判据[J].电网技术,2006,30(15):86-90.ZHAO Yongbin,LU Yuping.An asynchronous method based saturation criterion for CT in busbar protection[J].Power System Technology,2006,30(15):86-90.
[11]李艳鹏,侯启方,刘承志.非周期分量对电流互感器暂态饱和的影响[J].电力自动化设备,2006,26(8):15-18.LI Yanpeng,HOU Qifang,LIU Chengzhi.Influence of nonperiodic components on transient saturation of current transformer[J].Electric Power Automation Equipment,2006,26(8):15-18.
[12]任龙飞,郝治国,张保会.继电保护抗TA暂态饱和改进Prony算法[J].电力自动化设备,2014,34(5):126-131.REN Longfei,HAO Zhiguo,ZHANG Baohui.Improved Prony algorithm against transient CT saturation for relay protection[J].Electric Power Automation Equipment,2014,34(5):126-131.
[13]罗慧,周卿松,苗洪雷.基于LMD母线差动保护CT饱和检测方法研究[J].电力系统保护与控制,2015,43(12):49-53.LUO Hui,ZHOU Qingsong,Miao Honglei.A method for CT saturation detection based on LMD in busbar differential protection[J].Power System Protection and Control,2015,43(12):49-53.
[14]李建新,桂小军,俞镛伟.一种适用于母差保护的CT饱和判据[J].继电器,2006,31(3):72-78.LI Jianxin,GUI Xiaojun,YU Yongwei.CT saturation criterion suited for busbar differential protection[J].Relay,2006,31(3):72-78.
[15]张新刚,王泽忠,王晓华.基于波形奇异性特征检测电流互感器铁心饱和的新方法[J].电力系统自动化,2006,30(1):28-33.ZHANG Xingang,WANG Zezhong,WANG Xiaohua.New current transformer saturation detecting method based on singularity charaeteristics of waveforms[J].Automation of Electric Power Systems,2006,33(1):28-33.
[16]郑涛,刘万顺,肖仕武.一种基于数学形态学提取电流波形特征的变压器保护新原理[J].中国电机工程学报,2004,32(2):53-57.ZHENG Tao,LIU Wanshun,XIAO Shiwu.A new algorithm based on the mathematical morphology for power transformer protecion[J].Proceedings of the CSEE,2004,32(2):53-57.
[17]公茂法,夏文华,张晓明.基于HHT的抗CT饱和变压器故障识别新方法[J].电力系统保护与控制,2013,41(22):79-85.GONG Maofa,XIA Wenhua,ZHANG Xiaoming.New method to identify transformer fault with anti-CT saturation based on HHT[J].Power System Protection and Control,2013,41(22):79-85.
[2]刘志仁,殷志.电流互感器饱和导致保护拒动事故的分析[J].电力工程技术,2016,35(4):84-86.LIU Zhiren,YIN Zhi.Analysis of protective action resistance accidents caused by current transformer saturation[J].Electric Power Engineering Technology,2016,35(4):84-86.
[3]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(10):40-44.HU Yufeng,CHEN Deshu,YIN Xianggen.New differential protection of power apparatus based on sampled value and its application[J].Automation of Electric Power Systems,2000(10):40-44.
[4]黄继东,倪传坤,郭文利,等.母线保护区外转区内故障再动作判据[J].电力系统自动化,2014,38(18):120-124.HUANG Jidong,NI Chuankun,GUO Wenli,et al.Re-tripping discrimination of busbar differential protection when external fault transforms internal faule[J].Automation of Electric Power Systems,2014,38(18):120-124.
[5]张雪梅,李湛.线路故障引起母差保护异常动作的分析[J].电力工程技术,2016,35(5):88-89.ZHANG Xuemei,LI Zhan.Analysis of abnormal action of bus differential protection caused by line fault[J].Electric Power Engineering Technology,2016,35(5):88-89.
[6]李肖博,谭凌,揭萍,等.基于虚拟电流波形特征的母线保护原理[J].电力系统自动化,2015,39(16):115-119.LI Xiaobo,TAN Ling,JIE Ping,et al.An algorithm based on virtual current for busbar protection[J].Automation of Electric Power System,2015,39(16):115-119.
[7]吴崇昊,陆于平,刘小宝,等.基于电流互感器线性传变区检测的母线采样值差动保护[J].电网技术,2008,32(14):70-73.WU Chonghao,LU Yuping,LIU Xiaobao,et al.Busbar sampled value differential protection based on linear transfer section checking of TA[J].Power System Technology,2008,32(14):70-73.
[8]徐晓春,刘革明,戴光武,等.3/2开关接线方式下基于能量制动的抗电流互感器饱和措施[J].电力系统自动化,2016,40(12):189-193.XU Xiaochun,LIU Geming,DAI Guangwu,et al.Energy resistance based anti-saturation scheme with breaker-and-a-half configuration[J].Automation of Electric Power System,2016,40(2):189-193.
[9]杜丁香,周泽昕,王兴国,等.克服母线差动保护汲出电流的对策[J].电力系统自动化,2014,38(24):86-90.DU Dingxiang,ZHOU Zexin,WANG Xingguo,et al.Countermeasures to overcome outflow current for busbar differential protection[J].Automation of Electric Power System,2014,38(24):86-90.
[10]赵永彬,陆于平.一种基于异步法的母线保护中电流互感器饱和判据[J].电网技术,2006,30(15):86-90.ZHAO Yongbin,LU Yuping.An asynchronous method based saturation criterion for CT in busbar protection[J].Power System Technology,2006,30(15):86-90.
[11]李艳鹏,侯启方,刘承志.非周期分量对电流互感器暂态饱和的影响[J].电力自动化设备,2006,26(8):15-18.LI Yanpeng,HOU Qifang,LIU Chengzhi.Influence of nonperiodic components on transient saturation of current transformer[J].Electric Power Automation Equipment,2006,26(8):15-18.
[12]任龙飞,郝治国,张保会.继电保护抗TA暂态饱和改进Prony算法[J].电力自动化设备,2014,34(5):126-131.REN Longfei,HAO Zhiguo,ZHANG Baohui.Improved Prony algorithm against transient CT saturation for relay protection[J].Electric Power Automation Equipment,2014,34(5):126-131.
[13]罗慧,周卿松,苗洪雷.基于LMD母线差动保护CT饱和检测方法研究[J].电力系统保护与控制,2015,43(12):49-53.LUO Hui,ZHOU Qingsong,Miao Honglei.A method for CT saturation detection based on LMD in busbar differential protection[J].Power System Protection and Control,2015,43(12):49-53.
[14]李建新,桂小军,俞镛伟.一种适用于母差保护的CT饱和判据[J].继电器,2006,31(3):72-78.LI Jianxin,GUI Xiaojun,YU Yongwei.CT saturation criterion suited for busbar differential protection[J].Relay,2006,31(3):72-78.
[15]张新刚,王泽忠,王晓华.基于波形奇异性特征检测电流互感器铁心饱和的新方法[J].电力系统自动化,2006,30(1):28-33.ZHANG Xingang,WANG Zezhong,WANG Xiaohua.New current transformer saturation detecting method based on singularity charaeteristics of waveforms[J].Automation of Electric Power Systems,2006,33(1):28-33.
[16]郑涛,刘万顺,肖仕武.一种基于数学形态学提取电流波形特征的变压器保护新原理[J].中国电机工程学报,2004,32(2):53-57.ZHENG Tao,LIU Wanshun,XIAO Shiwu.A new algorithm based on the mathematical morphology for power transformer protecion[J].Proceedings of the CSEE,2004,32(2):53-57.
[17]公茂法,夏文华,张晓明.基于HHT的抗CT饱和变压器故障识别新方法[J].电力系统保护与控制,2013,41(22):79-85.GONG Maofa,XIA Wenhua,ZHANG Xiaoming.New method to identify transformer fault with anti-CT saturation based on HHT[J].Power System Protection and Control,2013,41(22):79-85.