Design of adaptive perturb and observe-fuzzy MPPT controller for high voltage gain multilevel boost converter

Abstract

The increased concerns for environmental protection and energy conservation had led to accelerated growth in PV technologies, however large scale integration of this to an AC grid will have a serious impact on power system operation. Development of DC power system is chosen as a solution to overcome many of those impacts. Photovoltaic arrays used here will generate an output at a low voltage level, to integrate this to high voltage DC grid a high voltage gain multi level boost converter (MLBC) is chosen, which includes conventional boost converter circuit in addition to switched capacitor circuit. MLBC offers high gain factors without attaining extreme duty ratios, continuous input current, low stress voltage across the switch and reduced component ratings. Adaptive perturb and observe (P&O) fuzzy MPPT controller is chosen here to track the maximum power point (MPP) for fluctuating input irradiation. MLBC topology along with chosen MPPT controller will achieve dual functionality of high voltage gain and maximum power point tracking. The performance of chosen MPPT on MLBC is compared with other MPPT techniques. The results of Matlab simulation were illustrated for corroborating its performance.