基于VMD能量比重的有源配电网故障选线方法

Fault Line Selection Method for Active Distribution Network Based on VMD Energy Proportion

针对有源配电网的故障选线问题本文提出了一种基于变分模态分解(VMD)能量比重的故障选线方法,首先截取各条线路故障后1/4周期的零序电流进行VMD分解,求出每个IMF分量对应的频带能量,同时计算IMF分量与原输入电流信号的相关系数,在计算每条线路的能量时相关系数作为权重考虑,最终得到各条线路的能量比重,并与系统设定的阈值比较作为最终判据选出故障线路.经过大量的仿真实验验证,表明该选线方法具有较高的准确性和可靠性.

To solve the problem of fault line selection in active distribution network,a fault line selection method based on the energy proportion of variational mode decomposition ( VMD) is proposed. Firstly, zero sequence current of 1/4 period after each line fault is intercepted and VMD decomposition is carried out to calculate the frequency band energy corresponding to each IMF component. At the same time,the correlation coefficient between IMF component and original input current signal is calculated. The energy correlation coefficient is considered as the weight,and the energy proportion of each line is finally obtained. The fault line selection is based on the comparison of the energy proportion and the threshold value of each line. The simulation results show that the method has high accuracy and reliability.