Modified P&O Based Mppt Controller For Photo Voltaic System Under Partial Shading Condition

Abstract: It is essential to extract the maximum available power from solar system since the energy efficiency of solar cell is about 13%-17% only. There must be converter for efficient electrical tracking. It is achieved by impedance matching between load and solar module. There may be multiple peaks under varying illumination and under partial shading of individual modules. In these case we have to track global maximum power point (GMPP) apart from local maximum power point (LMPP). The conventional techniques either cause energy wastage due to unwanted full PV curve sweeping or complex due to photo sensor and error in calculation. So a new algorithm based on modification of conventional P&O algorithm to track GMPP is trying to establish

Keywords: Maximum power point tracking (MPPT), multiple maxima, partial shading, photovoltaic (PV), Local Maximum Power Point, Global Maximum Power Point.