Estimating Capacitor Health Connected in Solar Power System Using Wavelet Transform

摘要

This paper presents an approach to estimates the health of capacitor connected in solar power applications using wavelet transform. In the approach, voltage and current waveform are analysed using wavelet transform. The characteristics of the voltage and current waveform under continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are modelled using multiresolution analysis by wavelet transform. A relation is developed between wavelet coefficients of voltage and current waveforms for estimating the equivalent series resistance (ESR) of a capacitor. The simulation results show small error in estimation of the capacitor ESR. Further, the approach uses waveform analysis in estimating capacitor health; hence, the method is simple over the current injection method for estimation ESR.