基于小波变换的能量变换器失磁分析及其保护方案的确定

Analysis and Determination of Protection Scheme of Powerformer under Loss of Excitation Based on the Wavelet Transform

本文基于小波变换的原理,确定能量变换器失磁保护方案。首先利用仿真方法得到能量变换器失磁故障过程中的电气量信号,然后利用小波变换的模极大值检测法,对失磁故障时的电气量信号进行分析。从故障信号中获得故障信息,确定了能量变换器的失磁保护方案。该保护方案可以有效地防止系统发生短路故障和系统振荡时引起的失磁保护装置误动作。

In this paper,the protection scheme of Powerformer under loss of excitation is proposed based on the wavelet transform principle.The change of electrical parameters under loss of excitation is obtained with simulation method,and then analyzed with the method of maximum value edge detection of wavelet transform.Finally,the fault information is got and the protection schemes of Powerformer with loss of excitation can be determined.Malfunction of loss of excitation protection device due to short-circuit or sys...