Cascaded Multi-Level Inverter for Battery Charging-Discharging using Buck-Boost Switch

Abstract

This work suggests a five-level cascaded bidirectional converter for battery charger application. The proposed converter is presented in both Buck and Boost approaches. The proposed converter operates at 50-kHz linked with isolated high frequency and loaded by a battery via Buck/Boost switch. The five-level scheme applied the phase disposition system to generate the PWM signal. Besides, this converter can be widely utilized in high-power and medium-voltage applications. The proposed converter simulated in MATLAB/SIMULINK and selected results were adopted to prove the system validity. As a result, the state of charge SOC is decreasing and increasing in charging and discharging mode, respectively. The controller was designed to automatically detect the required mode of operation, buck, or boost, based on the sign of Iref. In general, the behavior of the simulated system results is in agreement with the theoretical part.