Multi-tracking single-fed PV inverter

Grid-connected photovoltaic system is the most important among the photovoltaic applications. High efficiency power converter and maximum power point tracking (MPPT) are the key technologies of grid-connected inverters for photovoltaic system. Shadows created by clouds, trees ...etc. partially cover PV modules causes illumination decrease, in this condition the Current-voltage and power-voltage characteristics of large photovoltaic (PV) arrays become more complex and difficult to identify because different maximum power points exist, and the location of the global maximum power point is changing corresponding to the changing on the shading conditions. A multi-MPPT grid-connected photovoltaic system configuration based on the Perturb & Observe MPPT algorithm and Phase Shift Control is proposed in this paper. Two different configurations for a Grid-connected photovoltaic system, conventional and the proposed configurations, are investigated to verify the performance of the proposed configuration.