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In this paper, a novel topology scheme of photovoltaic inverter is presented. The proposed topology employ the 4-terminal switch-network that consist of three interleaving parallel connection half-bridges and a three winding transformer into low voltage inverter to achieve a multilevel voltage. This new inverter increases the output power and reduce the volume of filter inductance. The operation principle and all switch modes are described in details. Meanwhile, the modulation method is also demonstrated to achieve operation. Finally, simulation and experiment results verify the theoretical analysis.

A novel topology based on the 4-terminal switch-network for photovoltaic Inverter