
针对微电网灵活的运行方式及其高阻故障不易与正常扰动有效区分等问题,提出了一种基于经验小波变换和综合位置峰值的微电网高阻接地故障检测方法。通过差分运算和归一化运算来获取归一化差分零序电流;利用经验小波变换对归一化差分零序电流进行分解,并根据极值变化率指标来自适应地选取故障特征分量;利用采样点数编号和故障特征分量峰值来构建综合位置峰值量化指标,进而通过综合位置峰值的不同取值来实现微电网高阻接地故障。大量仿真实验表明,所提方法能够准确检测出微电网高阻故障,并不受微电网正常扰动、运行状态的影响。
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