Novel 1-ϕ multilevel current source inverter for balanced/unbalanced PV sources

This paper proposes a new 1-φ multilevel current source inverter (MCSI) configuration which can generate symmetrical output current levels for both balanced and unbalanced PV sources. The proposed MCSI topology has less number of power devices as compared to conventional MCSI. By using proposed control strategy, good quality of current can feed in to the utility when both the PV sources operate at their own maximum power point. Efficacy of the proposed MCSI topology is tested with two PV sources operating under partially shaded conditions i.e the two sources are receiving different irradiation. The simulation results corresponding to the proposed configuration are presented for 500W system.