基于小波理论的频带自适应故障选线法及其在船舶电网中的应用

针对船舶电网小电流故障接地时的选线难题，结合船舶电网中性点的接地方式以及拓扑结构特征，对故障接地的暂态过程进行深入分析，之后提出一种基于小波理论的暂态分量故障选线方法，检测零序电压信号的奇异性及突变点的时间信息，提取故障发生时刻前后各一周期的故障信号作为启动选线程序的引导条件，多尺度小波分解故障信号并自适应选择故障暂态特征信息最明显的频带分量进行小波重构，依照定义的能量因子计算各线路的暂态能量实现故障选线。最后通过仿真计算验证了该方法具有较强的抗干扰能力，选线准确可靠。

Transient fault line detection with adaptive band selection based on wavelet theory for ship power system

Combining with the ship power neutral grounding mode and the topology characteristics, a deep analysis is made aiming at the small current grounding fault line selection problem. A new kind of adaptive transient fault line selection algorithm is put forward based on wavelet theory, which needs to detect the singularity of zero sequence voltage signal and the time information of the mutation point, then extract each cycle fault signal before and after the fault point as the staring guide condition of the section program, the wavelet reconstruction with adaptive band selection of the fault signals are carried out after the multi scale wavelet decomposition, then calculate the transient energy of each line using the defined energy factor to complete fault line selection. Finally, through large mount of simulation calculation to verify that the new algorithm has strong anti interference ability, and the results are accurate and reliable.