Abstract :
This paper presents a control for a three phase five-level neutral clamped inverter (NPC) for grid connected PV system. The maximum
power point tracking (MPPT) is capable of extracting maximum power from the PV array connected to each DC link voltage level. The
MPPT algorithm is solved by fuzzy logic controller. The fuzzy MPPT is integrated with the inverter so that a DC–DC converter is not
needed and the output shows accurate and fast response. A digital PI current control algorithm is used to remain the current injected into
the grid sinusoidal and to achieve high dynamic 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 grid connected NPC inverter in terms of
THD.
2011 Elsevier Ltd. All rights reserved.
