采用行波固有频率的混合线路故障测距新方法

发布时间：2018-01-30 04:58

本文关键词： 混合线路固有频率频谱混叠聚类经验模型分解算法　出处：《电力系统及其自动化学报》2015年11期 　论文类型：期刊论文

【摘要】：对于电缆-架空混合线路,由于波阻抗的不连续会形成混叠的固有频率频谱,因此,解决频谱混叠现象是提高固有频率测距法精度的首要问题。为此,提出一种基于聚类经验模型分解(EEMD)算法的行波固有频率的故障测距方案。首先利用EEMD算法得到一系列的固有模态函数(IMF)分量;然后选取聚集故障信息的IMF分量,引入多重信号分类(MUSIC)算法对其进行频谱估计得到固有频率主成分;最后利用故障行波的固有频率和故障距离的关系式即可实现故障测距计算。仿真对比显示了该方法可更好地解决混合线路故障测距时存在的频谱混叠问题,实现较高精度的故障定位。
[Abstract]:For cable-overhead hybrid line, because the discontinuity of wave impedance will form the frequency spectrum of aliasing, therefore, to solve the problem of spectrum aliasing is the most important problem to improve the accuracy of the natural frequency ranging method. A fault location scheme of traveling wave natural frequency based on clustering empirical model decomposition (EEMD) algorithm is proposed. Firstly, a series of intrinsic mode functions (IMFs) components are obtained by using EEMD algorithm. Then the IMF component of the aggregated fault information is selected and the principal component of the natural frequency is obtained by using the multiplex signal classification algorithm to estimate the frequency spectrum. Finally, the calculation of fault location can be realized by using the relationship between the natural frequency of the fault traveling wave and the fault distance. The simulation results show that this method can better solve the problem of spectrum aliasing in hybrid line fault location. High precision fault location is realized.
【作者单位】：福州大学电气工程与自动化学院;
【分类号】：TM75
【正文快照】： 目前,有关电缆-架空混合线路的故障测距的研究倍受关注。混合线路的测距方法多种多样,其中包括行波固有频率法[1-3],该方法通过提取故障行波的固有频率主成分,再利用频率和距离的关系式来实现故障测距。由于电缆和架空线的波阻抗不一致,因此行波在故障点和线路连接点均会发生

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