Investigations on solar PV grid interfaced power generating system using two-level twelve-pulse double bridge converter

This paper presents the double stage solar photovoltaic (PV) grid interfaced power generating system using two-level twelve-pulse double bridge voltage source converter (VSC) for large capacity plants with improved power quality. The maximum power is tracked with variable step incremental-resistance (INR) maximum power point tracking (MPPT) method and the maximum power obtained is transferred to the grid. A set of two-level pulse double bridge converter consists of four 6-pulse two-level VSC operated at 50 Hz switching frequency. This results in reduction of grid current and grid voltage total harmonic distortion (THD) which is in accordance to the IEEE 519 standard without performing high frequency switching control. Simulated results have validated the design and control algorithm of the proposed system configuration under varying conditions.