A new topology of unidirectional multistring PV inverter with high frequency AC-Link

A new topology of multi-string single-stage unidirectional Inverter with high frequency AC-Link and soft switching ability has been introduced in this paper. This inverter has the ability of connecting several PV strings with different levels of voltage and currents to the AC grid. Moreover it has the ability of individual Maximum-Power-Point-Tracking (MPPT) for different PV strings that works in different situation of temperature and light radiation. High frequency AC-Link eliminates the need for large DC-Link Capacitor. It consists of a self-inductor which resonates with a small value capacitor in high frequency. This new topology of unidirectional single-stage multi-string PV inverter uses reverse blocking switches so it enhances the inverter reliability and makes it suitable for medium and low power levels. Presented simulations verify good performance of the introduced inverter.