A NOVEL MODULAR MULTIPORT BIDIRECTIONAL BUCKBOOST DC–DC CONVERTER FOR HYBRID ELECTRIC VEHICLE APPLICATIONS

Abstract

Hybrid Electric Vehicles (HEVs) require efficient energy management systems capable of coordinating power flow among multiple energy sources while maintaining high efficiency and operational reliability. This paper proposes a modular buck-boost multiport bidirectional DC–DC converter integrated with a Fuzzy Logic Controller (FLC) for intelligent energy management in HEV applications. The proposed converter enables bidirectional power transfer among the battery pack, supercapacitor bank, and traction motor through a compact and scalable architecture. The modular configuration reduces component stress, improves fault tolerance, and facilitates system expansion for different vehicle power ratings. A fuzzy logic-based energy management strategy is developed to dynamically allocate power according to vehicle operating conditions, battery stateof-charge (SOC), supercapacitor voltage, and load demand. The proposed controller effectively mitigates battery stress by assigning transient power requirements to the supercapacitor while maintaining optimal battery utilization. MATLAB/Simulink simulation studies validate the performance of the proposed system under acceleration, cruising, regenerative braking, and sudden load variations. Results demonstrate enhanced power-sharing capability, improved energy efficiency, reduced battery current fluctuations, and superior dynamic response compared with conventional rulebased control methods. Therefore, the proposed converter and control strategy provide a promising solution for nextgeneration HEV energy management systems.