Grid integration of single stage solar PV power generating system using 12-pulse VSC

This paper presents a single stage solar photovoltaic (PV) grid interfaced power generating system using two-level 12-pulse double bridge voltage source converter (VSC) with improved sinusoidal signal integrator PLL (SSI-PLL) based control algorithm for large capacity plants with improved power quality. The maximum power is tracked with modified perturbation and observation (P&O) maximum power point tracking (MPPT) method and the maximum power obtained is transferred to the grid. Multipulse VSC 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.