Series-Parallel Differential Power Processing Scheme for Maximised Power Extraction from Mismatched Photovoltaic Panels

In recent years, there has been an increasing interest in utilising Differential Power Processing converters (DPP) in Photovoltaic (PV) applications to achieve the maximum power point tracking (MPPT), minimum losses and high efficiency under unequal lighting conditions. This paper presents a novel Series and Parallel (SP) DPP converters scheme, with a proper control technique to optimise the system output power under mismatch conditions compared to that of a conventional 2×2 SP array which is protected with bypass diodes. The simulation results of such system show significant improvements in the total power of the SP-DPP system under PSCs.