Application of a two-phase interleaved step-up converter for photovoltaic power maximization

This paper describes an analysis of a two-phase interleaved step-up converter and its application in maximum power point tracking (MPPT) for photovoltaic (PV) panel. The transient as well as steady-state characteristics of the interleaved converter were analyzed by using state-space averaging technique. A two-phase interleaved step-up converter was then constructed and implemented to keep maximizing the PV output power in spite of irradiance changes. Compared to the single-phase topology the input current ripple was reduced by about 35% and the load voltage ripple was reduced by about 50%.