多分辨信息熵的计算及在故障检测中的应用

摘要

The continuous wavelet transform defin ition, multi-resolution analysis and Mallat fast decomposition algorithm are in t roduced. Based on the multi-resolution analysis of signals,the multi-resolutio n entropy, a wavelet transform post-processing method, is defined. The dynamic system simulation indicates that this index has unique sensitivity to parameter changes. Applied to a real EVH transmission line system, by virtue of EMTDC simu lation analysis, the multi-resolution entropy can easily detect the faults of p ower system device and transmission line. It is a real time method, and is insen sitive to fault conditions.%介绍了连续小波变换定义、多分辨分析及Ma llat 快速小波分解算法。基于信号的多分辨分析，定义了一种多分辨信息熵指数作为信号小波分析的一种后处理方法。对动态系统的仿真分析表明，该指数对系统参数微小的变换具有独特的敏感性，对EMTDC仿真分析一实际EHV输电线路故障暂态信号的研究结果表明，多分辨信息熵指数对电力设备、电网故障具有较强的检测能力，同时具有抗干扰能力强、实时性好的特点。