Design a Perturb & Observe MPPT Algorithm for PV System Based Asymmetric Cascaded HalfBridge Multilevel Inverter

Abstract

Objectives/methods: This research proposes a Perturb and Observe (P&O) algorithm to extract maximum power point for photovoltaic (PV) system which then used as a direct current (DC) source for an asymmetrical cascaded half-bridge (ACHB) multilevel inverter (MLI). The whole system is modelled in MATLAB/SIMULINK. An approach is used to give input DC sources to asymmetrical cascaded halfbridge MVI with two PV systems. For PV system, a P&O maximum power point tracking (MPPT) algorithm is used to control the duty cycle of DC to DC boost converter for maintaining the constant output voltage. The switching pattern of MLI done by using pulse width modulation (PWM) technique. Findings: The proposed switching sample based on Multi Carrier (MC) PWM which reduces the voltage of components, decrease size, cost and also switching losses. ACHB MLI is attractive for its features as it gives higher level of output voltage by using fewer number of switching devices. Finally, two PV systems of different output voltages are integrated with asymmetrical cascaded half-bridge MVI. The results of the proposed model are verified in MATLAB/SIMULINK. Novelty: Dual P&O MPPT algorithms based PV system is used as input DC source for asymmetric cascaded half-bridge MLI which provides higher level output voltage as compared to conventional two-level inverter.