Bidirectional DC-DC Convert Based Photovoltaic Power System

A simple bidirectional DC-DC power converter for stand-alone photovoltaic power generation was presented,and a parallel connected maximum power point tracking(MPPT) system was also introduced,to realize the functions of battery charger and step-up converter.The parallel connection of the MPPT system reduces power converter losses in the overall efficiency because only a part of the generated power is processed by the MPPT system.Furthermore,all control algorithms used in the classical series-connected MPPT can be applied to the parallel system.