改进型小波包算法在变频调速系统故障诊断中的应用

Application of Improved Wavelet Packet Algorithm in Fault Diagnosis of Frequency-conversion Speed-regulation System

在目前交-交变频调速系统故障诊断方法的研究基础上,文章提出了一种采用改进的小波包算法对交-交变频调速系统进行故障诊断的方法。文章在分析了标准的小波包算法原理及缺点的基础上,阐述了改进的小波包算法原理,并详细介绍了采用改进的小波包算法提取变频器故障信号特征量的方法。仿真结果表明:改进的小波包算法的计算量和占用的存储空间较标准的小波包算法少;与常规的诊断方法相比,基于改进型小波包算法的变频调速系统故障诊断方法具有准确度高、诊断速度快等优点。

On the basis of research of current fault diagnosis method of AC-AC frequency-conversion speed-regulation system, the paper proposed a fault diagnosis method of AC-AC frequency-conversion speed-regulation system with improved wavelet packet algorithm. It expounded principle of improved wavelet packet algorithm on the basis of analyzing principle and disadvantages of standard wavelet packet algorithm and introduced the method using the improved wavelet packet algorithm to pick up characteristic quantity of fault signal of frequency converter in details. The simulation result showed that amount of calculation and appropriative storage space of the improved wavelet packet algorithm are less than that of the standard wavelet packet algorithm. Compared with current fault diagnosis method, the fault diagnosis method of frequency-conversion speed-regulation system based on the improved wavelet packet algorithm has advantages of high accuracy, fast diagnosis speed, etc.