A new reactive, distortion and non-active power measurement method for nonstationary waveforms using wavelet packet transform

摘要: Abstract The definitions of power components that are contained in the IEEE Standard 1459-2000 [IEEE Std. 1459-2000, Definitions for measurement electric quantities under sinusoidal, non-sinusoidal, balanced or unbalanced conditions, 2000] based on Fourier transform (FT) which is suitable only case stationary waveforms. However, nonstationary waveforms, FT produces large errors. Therefore, this become inaccurate. A new approach wavelet packet (WPT) defining these developed paper. advantages using it can accurately represent and measure providing uniform frequency bands while preserving both time information. In addition, paper addresses problem choosing most appropriate mother measurements. results applying approaches to waveforms show currently used according result errors proposed (WPT based) gives more accurate situation.