MPPT for photovoltaic system

Abstract. This paper presents a control for a three-phase seven-level diode-clamped multilevel inverter (DCMLI) for photovoltaic (PV) systems which improves DC link utilization, output voltage quality and avoids the DC link capacitor voltage balancing problem experienced with standard multilevel operation. The maximum power point tracking (MPPT) is capable of extracting maximum power from PV array connected to each DC link voltage level and it is solved by neuro-fuzzy controller (NFC). Space vector pulse width modulation (SVPWM) algorithm uses a simple mapping to generate gate signals for the inverter. The con-trol system employs the proportional controller (PI) controller to generate the SVPWM signals for IGBT switching, thus producing and regulating the 50Hz sinusoidal AC output voltage and to achieve high dy-namic performance with low total harmonic distortion (THD). The validity of the system is verified through MATLAB/Simulink and the results are compared with three-phase three-level and five-level DCMLI for PV system in terms of THD. Finally, simulation results are presented to verify the effectiveness and accuracy of the proposed system