A Grid Current-controlled Inverter with Particle Swarm Optimization MPPT for PV Generators

This paper proposes a threephase fourwire current � controlled Voltage Source Inverter (CCVSI) for bot h power quality improvement and PV energy extraction. For power quality improvement, the CCVSI works as a grid currentcon trolling shunt active power filter to compensate for harmonic and reactive power of loads. Then, the PV array is coupled to the DC bus of the CCVSI and supplies active power to the grid. The MPPT controller employs the particle swarm optimization technique. The output of the MPPT controller is a DC voltage that determines the DCb us voltage according to PV maximum power. The PSO method is simple and effective especially for a partially shaded PV array. From computer simulation results, it proves that grid currents are sinusoidal and in� phase with grid voltages, while the PV maximum active power is delivered to loads.

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