Abstract
This paper presents a five-level cascaded multilevel inverter controlled by an adaptive hysteresis band current controller for photovoltaic system. Due to increasing the number of levels, the proposed five-level cascaded multilevel inverter further reduces its total harmonic distortion (THD). The solar system is simulated using MATLAB/Simscape software and it is integrated with DC–DC boost converter and single-phase five-level cascaded multilevel inverter controlled by the proposed control strategy. The simulation results show that the proposed controller provides constant switching frequency, reduced harmonics and can reach its steady state quickly compared to the conventional fixed hysteresis controller and standard PWM controller. Also, the proposed five-level cascaded multilevel inverter reduces THD of the output voltage and current. The proposed controller is also implemented Xilinx Spartan 3E field programmable gate array using the Atmel AT90USB2 USB controller on the Basys2 development board. The simulation and experimental results describe and verify the current control technique for the multilevel inverter.
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