Performance analysis of a stand alone PV system with reduced switch cascaded multilevel inverter
by R. Sridhar; Snehamoy Dhar; Subhranshu Sekhar Dash
International Journal of Power and Energy Conversion (IJPEC), Vol. 6, No. 2, 2015

Abstract: In this paper, a photovoltaic (PV) system fed single phase multilevel inverter (MLI) aimed at feeding standalone loads is proposed. The proposed system consists of PV array, DC-DC boost converter with maximum power point tracking (MPPT) controller and a reduced switch cascaded inverter. The proposed MLI is advantageous in terms of performance and efficiency as it minimises switching losses which are prevalent in the conventional cascaded one. This work also aims at increasing the DC utilisation of the inverter by adopting third harmonic injection pulse width modulation (THIPWM) technique instead of sinusoidal pulse width modulation (SPWM). The non-linear nature of the PV array is combated by a DC-DC converter which is controlled by perturb and observe (P&O) MPPT algorithm. The performance of the proposed system is verified through a simulation study in MATLAB/simulink and also by developing a prototype of 200 watts. The simulation and hardware results demonstrate minimal switching losses, low THD value with increased DC utilisation suitable for various standalone household loads.

Online publication date: Sat, 16-May-2015

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