A new DSP-based ZVT photovoltaic energy conversion system

This paper proposes two new topologies-zero voltage transition (ZVT) charge and discharge converters applied to the renewable photovoltaic energy conversion system. Aside from the capability of making the maximum power point tracking (MPPT), the main switch also has the capability of ZVT, which could minimize the loss caused by the transition of the switch. Also, the energy transformed from the switch could be transferred to the battery and recharge the battery. The battery could also be recharged and discharged to achieve the energy balance of system. Furthermore, the battery voltage is not needed to be the same as the DC bus voltage in the proposed system. The conversion system therefore has more design flexibility in the choice of the battery voltage and DC bus voltage.