基于IMF和MC-ApEn的含DG中压配电网故障测距研究
|
摘要
中压配电网的定位问题一直是电力系统的研究重点。由于发生单相接地故障后故障电流微弱,传统阻抗法和人工巡线法都存在缺点,DG的接入更加大了测距的难度。文章以行波理论为基础,提出一种基于IMF和MC-ApEn的含DG中压配电网测距方法。文章首先对含DG的配电网暂态电流特性进行分析,提出采用零模-线模传输时间差的测距原理。随后采用EMD分解法提取暂态信号最高频分量,获得行波波头的一次提取。借助表征信号复杂度的近似熵方法,提出MC-ApEn(滑动移除近似熵法)提取行波波头,从而实现故障测距。EMTP/ATP仿真验证了该方法的可行性。
The positioning of medium-voltage distribution network has always been the focus of power system research. Due to the weak fault current after single-phase grounding fault, both the traditional impedance method and the manual inspection method have shortcomings. Using the traveling wave theory, this paper proposes a medium voltage distribution with DG distance measurement method based on IMF and MC-ApEn. This paper first analyzes the transient current characteristics of distribution network with DG, and puts forward the time difference between zero mode and line mode. Then the maximum frequency component of transient signal is extracted by EMD decomposition method, and the first extraction of traveling wave head is obtained. By using approximate entropy method to represent signal complexity, MC-ApEn(moving cut data-approximate entropy method) is proposed to extract the traveling wave head, so as to realize fault ranging. EMTP/ATP simulation proves the feasibility of this method.
The positioning of medium-voltage distribution network has always been the focus of power system research. Due to the weak fault current after single-phase grounding fault, both the traditional impedance method and the manual inspection method have shortcomings. Using the traveling wave theory, this paper proposes a medium voltage distribution with DG distance measurement method based on IMF and MC-ApEn. This paper first analyzes the transient current characteristics of distribution network with DG, and puts forward the time difference between zero mode and line mode. Then the maximum frequency component of transient signal is extracted by EMD decomposition method, and the first extraction of traveling wave head is obtained. By using approximate entropy method to represent signal complexity, MC-ApEn(moving cut data-approximate entropy method) is proposed to extract the traveling wave head, so as to realize fault ranging. EMTP/ATP simulation proves the feasibility of this method.
引文
[1]季涛,孙同景,徐丙垠,等.配电混合线路双端行波故障测距技术[J].中国电机工程学报,2006,26(12):89-94.
[2]LI Yingfeng.Discussion on distribution network neutral grounding modes through arc suppression coil[J].Electric Switchgear,2008(6):1-2.
[3]周聪聪,舒勤,韩晓言.基于线模行波突变的配电网单相接地故障测距方法[J].电网技术,2014,38(7):1973-1978.
[4]SHEHAB-ELDIN E H,MCLAREN P G.Travelling wave distance protection-problem areas and solutions[J].IEEE Transactions on Power Delivery,2002,3(3):894-902.
[5]叶磊.新型中压配电网单端故障定位方法的研究[D].武汉:华中科技大学,2013.
[6]张帆,潘贞存,马琳琳,等.基于模量行波传输时间差的线路接地故障测距与保护[J].中国电机工程学报,2009,29(10):78-83.
[7]贾惠彬,赵海锋,方强华,等.基于多端行波的配电网单相接地故障定位方法[J].电力系统自动化,2012,36(2):96-100.
[8]王阳,曾祥君,黎锐烽,等.基于图论的配电网故障行波定位新算法[J].电力系统自动化,2012,36(18):143-147.
[9]杨荦源,舒勤.基于线模行波突变的配电网全架空线路单相接地的多端检测定位新方法[J].电力系统保护与控制,2016,44(9):22-28.
[10]符玲,何正友,麦瑞坤,等.近似熵算法在电力系统故障信号分析中的应用[J].中国电机工程学报,2008,28(28):68-73.
[11]孙波,徐丙垠,孙同景,等.基于暂态零模电流近似熵的小电流接地故障定位新方法[J].电力系统自动化,2009,33(20):83-87.
[12]何文平,何涛,成海英,等.基于近似熵的突变检测新方法[J].物理学报,2011,60(4):813-821.
[13]王珺,董新洲,施慎行.考虑参数依频变化特性的辐射状架空配电线路行波传播研究[J].中国电机工程学报,2013,33(22):96-102.
[2]LI Yingfeng.Discussion on distribution network neutral grounding modes through arc suppression coil[J].Electric Switchgear,2008(6):1-2.
[3]周聪聪,舒勤,韩晓言.基于线模行波突变的配电网单相接地故障测距方法[J].电网技术,2014,38(7):1973-1978.
[4]SHEHAB-ELDIN E H,MCLAREN P G.Travelling wave distance protection-problem areas and solutions[J].IEEE Transactions on Power Delivery,2002,3(3):894-902.
[5]叶磊.新型中压配电网单端故障定位方法的研究[D].武汉:华中科技大学,2013.
[6]张帆,潘贞存,马琳琳,等.基于模量行波传输时间差的线路接地故障测距与保护[J].中国电机工程学报,2009,29(10):78-83.
[7]贾惠彬,赵海锋,方强华,等.基于多端行波的配电网单相接地故障定位方法[J].电力系统自动化,2012,36(2):96-100.
[8]王阳,曾祥君,黎锐烽,等.基于图论的配电网故障行波定位新算法[J].电力系统自动化,2012,36(18):143-147.
[9]杨荦源,舒勤.基于线模行波突变的配电网全架空线路单相接地的多端检测定位新方法[J].电力系统保护与控制,2016,44(9):22-28.
[10]符玲,何正友,麦瑞坤,等.近似熵算法在电力系统故障信号分析中的应用[J].中国电机工程学报,2008,28(28):68-73.
[11]孙波,徐丙垠,孙同景,等.基于暂态零模电流近似熵的小电流接地故障定位新方法[J].电力系统自动化,2009,33(20):83-87.
[12]何文平,何涛,成海英,等.基于近似熵的突变检测新方法[J].物理学报,2011,60(4):813-821.
[13]王珺,董新洲,施慎行.考虑参数依频变化特性的辐射状架空配电线路行波传播研究[J].中国电机工程学报,2013,33(22):96-102.