基于小波暂态能量的自适应故障选线新方法
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摘要
针对当前小电流接地系统在相电压过零时发生故障选线准确率不高的问题,分析了小电流接地系统发生单相接地故障后零序电流的频率特征。提出了一种基于小波暂态能量的故障初始角自适应故障选线新方法,该方法利用快速傅里叶变换获取电压相位估算故障初始角,并根据能量最大值原理进行故障选线。通过理论分析,数字仿真实验,证明了所提出的方法基本不受过渡电阻、故障初始角、电弧故障和故障距离的影响,能够准确快速地选出故障线路。
In order to solve the problem that the fault line selection accuracy is not high when the phase-voltage is close to zero-crossing point, the frequency characteristics of the zero-sequence current after a single-phase to ground fault occurs in non-solidly-grounded system are analyzed. At the same time, a new adaptive fault line selection method based on wavelet transient energy fault initial angle is proposed. The method uses fast Fourier transform to obtain voltage phase to estimate the initial angle of the fault, and selects the fault line according to the principle of energy maximum. Through theoretical analysis and numerical simulation, it is proved that the proposed method is not affected by transition resistance, initial angle of fault, arc fault and fault distance, and the fault line can be selected accurately and quickly.
In order to solve the problem that the fault line selection accuracy is not high when the phase-voltage is close to zero-crossing point, the frequency characteristics of the zero-sequence current after a single-phase to ground fault occurs in non-solidly-grounded system are analyzed. At the same time, a new adaptive fault line selection method based on wavelet transient energy fault initial angle is proposed. The method uses fast Fourier transform to obtain voltage phase to estimate the initial angle of the fault, and selects the fault line according to the principle of energy maximum. Through theoretical analysis and numerical simulation, it is proved that the proposed method is not affected by transition resistance, initial angle of fault, arc fault and fault distance, and the fault line can be selected accurately and quickly.
引文
[1]贺家李,宋从炬.电力系统继电保护原理[M].北京:中国电力出版社,2010.
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[3]吴乐鹏,黄纯,林达斌,等.基于暂态小波能量的小电流接地故障选线新方法[J].电力自动化设备,2013,33(5):70-75.
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[11]顾荣斌,蔡旭,陈海昆,等.非有效接地电网单相电弧接地故障的建模及仿真[J].电力系统自动化,2009,33(13):63-67.
[12]陈博博,屈卫锋,杨宏宇,等.小电流接地系统单相接地综合电弧模型与选线方法的研究[J].电力系统保护与控制,2016,44(16):1-7.
[2]琚永安,刘聪,单汝涛,等.消弧线圈接地系统单相断线故障的辨识与定位[J].中国电力,2017,50(8):113-117.
[3]吴乐鹏,黄纯,林达斌,等.基于暂态小波能量的小电流接地故障选线新方法[J].电力自动化设备,2013,33(5):70-75.
[4]彭泓,杨巍.基于EEMD和关联维数的小电流接地故障选线方法[J].测控技术,2017,36(1):124-128.
[5]田书,寿好俊,尚鹏辉.基于HHT的谐振接地配电网暂态量故障选线研究[J].测控技术,2017,36(3):14-19.
[6]徐耀松,邱尚龙.基于HHT与PNN的输电线路故障分类[J].测控技术,2018,37(1):19-22.
[7]要焕年,曹梅月.电力系统谐振接地[M].北京:中国电力出版社,2009.
[8]戴剑锋,张艳霞.基于多频带分析的自适应配电网自适应故障选线研究[J].中国电机工程学报,2003,23(5):44-47.
[9]覃剑,陈祥训,雷林绪.输电线路行波故障测距技术及小波变换应用[M].北京:中国电力出版社,2015.
[10]任建文,张猛,谷雨峰.基于本征模态熵的谐振接地系统故障选线研究[J].华北电力大学学报(自然科学版),2014,41(6):53-59.
[11]顾荣斌,蔡旭,陈海昆,等.非有效接地电网单相电弧接地故障的建模及仿真[J].电力系统自动化,2009,33(13):63-67.
[12]陈博博,屈卫锋,杨宏宇,等.小电流接地系统单相接地综合电弧模型与选线方法的研究[J].电力系统保护与控制,2016,44(16):1-7.