【摘要】 研究提出了一种基于经验模态分解和Hausdorff距离的小电流接地系统暂态选线方法。首先,该方法将配电母线各出线的零序电流进行经验模态分解,得到相应的本征模态函数,再通过Hausdorff距离算法计算各本征模态函数波形之间的相似度,根据相似度判据进行故障线路筛选。采用Matlab/Simulink仿真软件搭建小电流接地系统故障选线模型,并对系统在不同故障条件下分别进行仿真分析。仿真结果表明,该方法选线简单且准确性高,不易受故障初相角、故障距离以及过渡电阻等故障初始条件的影响。更多还原

【Abstract】 A transient line selection method based on empirical mode decomposition and Hausdorff distance for small current grounding systems was proposed.Firstly,the method uses the empirical mode decomposition to obtain the corresponding intrinsic mode functions for the zero-sequence current of each outgoing line of the distribution grid bus,and then calculate the similarity between the waveforms of each intrinsic mode function using Hausdorff distance algorithm to select fault line by similarity criterion.The fault line selection model of small current grounding system was built by Matlab/Simulink simulation software,and the system is simulated and analyzed under different fault conditions.The simulation results show that the method is simple and accurate,and is not susceptible to fault initial conditions such as fault initial phase angle,fault distance and transition resistance.更多还原