Enhancing Power Quality in EV Charging Systems: A Fuzzy Logic-Based Control Strategy for Isolated Multi-port Converters with Reduced THD

Progress in power electronic-based converters is critical for developing high-power, cost-effective, and reliable charging solutions for electric vehicle (EV) batteries, particularly as the adoption of EVs continues to rise. This study introduces an innovative isolated hybrid three-port converter that integrates a single-phase full-wave bridge rectifier, a series resonant converter (SRC), and a dual active bridge (DAB) converter to achieve these objectives. The proposed three-port configuration reduces the number of components, leading to lower system costs and simplified design. Additionally, the inclusion of a multilevel rectifier (MLR) at the input stage enhances the input voltage waveform quality and reduces voltage stress on power switches. By incorporating fuzzy logic, the total harmonic distortion is significantly reduced to 0.19%. A simplified decoupled control strategy, utilizing pulse width modulation (PWM) and phase shift techniques, is implemented to manage power flow across all three ports simultaneously. The system is modelled and simulated in MATLAB/Simulink, with experimental validation conducted in a laboratory environment.