Maximum power enhancement under partial shadings using modified Sudoku reconfiguration

Abstract

Partial shading is one of the important factors in reducing maximum power generation from PV (Photovoltaic) arrays. Maximum power generation can be improved by selecting PV array in Total-Cross-Tied (T-C-T) connection. But still maximum power generated from T-C-T can be improved by distribution of shading over various rows. Due to distribution of shading, the current entering the node increases and results in improved maximum power generation. This can be done effectively by using Sudoku reconfiguration techniques. These techniques are economical, since they don't require any sensors and switching networks. This technique only changes the physical location of PV panel but electrical connection between the panels remains same. This paper proposes a Modified Sudoku reconfiguration pattern which enhances the maximum power from T-C-T connected PV array. Further, theoretical calculation of row current and power output have been done for existing and proposed topologies under various shading patterns. The performance of proposed pattern has been analyzed and compared using the specifications like Global Maximum Power (GMP), Fill Factor (FF), mismatch losses, and efficiency. From the results, it can be concluded that the Modified Sudoku reconfiguration enhances the GMP under all shading conditions.