A three-phase grid-connected PV system

This work deals with the design and laboratory implementation of a static converter for grid connected PV power systems. The converter is made zip of a DC-DC boost structure controlled by a neural network and a three-phase voltage source inverter (VSI) with optimised sinusoidal PWM strategy. The DC-DC boost converter allows the PV system to operate at maximum power point. The three-phase VSI provides the necessary voltage and frequency for interconnection to the grid. The optimised switching strategy used guarantees harmonics elimination at the VSI output voltage up to the 17^th harmonic. The DC-DC and DC-AC structures use IGBT as power switches, and the system control signals are generated by a 80X51 microcontroller-based circuit Experimental results are shown to access the performance of the system PV system and its behaviour at the interconnection point