A WT Based DSP Algorithm to Calculate SAPC Compensating Current in Accordance to IEEE STD 1459-2010

This paper presents a new digital signal processing (DSP) algorithm based on wavelet transform (WT) in order to calculate compensating current of shunt active power compensator (SAPC). The proposed algorithm depends on the highly resolution approach which has been presented previously by the authors to calculate the electrical power components defined in IEEE STD 1459-2010 in case of non-sinusoidal and un-balanced voltage and current waveforms. The presented algorithm relies on the advantage of discrete wavelet transform (DWT) in order to calculate the phasors (magnitude and phase angle) of fundamental frequency component of voltage and current waveforms. Also it is using the advantage of discrete wavelet packet transform (DWPT) in harmonic analysis of non-sinusoidal waveforms in order to calculate RMS values of integer harmonics. The developed algorithm is tested with the synthesised waveforms and obtained results are compared with results of the other methods.