Abstract
Conventional photovoltaic (PV) centralized single stage grid tie inverter suffers from the problem of lower efficiency, high filter size, and limited depth of operation for remaining in connection with the grid particularly under lower insolation/partial shading condition. This paper proposes a staggered PV connection through cascaded multilevel converter (CMC) for PV-grid tie application utilizing independent MPPT controller providing the larger depth of operation under partial shading condition, with smaller filter size and EMI. The proposed topology and its d-q frame control is investigated for performance evaluation of proposed system. A comparative analysis is also done for operation of PV under partial shading condition for a conventional PV inverter vis-a-vis proposed CMC-based approach. The comparative performance analysis is demonstrated both through simulation and experimentation.
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