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A METHOD TO DIAGNOSE FREQUENCY SHIFT OF POWER SYSTEMS BASED ON MODIFIED AMPLITUDE OF WAVELET TRANSFORM

ZHU Feng-feng;REN Zhen;HUANG Wen-ying Science College, South China University of Technology, Guangzhou 510640, Guangdong Province, China Electric Power College, South China University of Technology, Guangzhou 510640, Guangdong Province, China  
Frequency is one of important indices in power quality evaluation. Here, the detection of frequency shifts of power system signals is studied. Firstly, two real mother wavelets and the concept of the modified amplitude based on the transform of the two wavelets are presented, the recurrence algorithm of the two wavelet transforms are derived. Secondly, it is theoretically explained that for sinusoidal voltage signals not only the modified amplitude based on the transform of the two real wavelets can accurately determine that at which time interval the frequency of the voltage is the fundamental frequency and at which time interval the frequency of the voltage shift occurs. In addition, the modified amplitude can detect the direction in which the voltage frequency deflects the fundamental frequency and can resolve the amplitude information involved in the sinusoidal signal. Simulation results show that the modified amplitude based on the transform of the two real wavelets is an effective tool to diagnose the frequency shifts of sinusoidal signals.
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