Implementation and Performance Analysis of Solar PV-based Multi-Chemistry EV Charging System

Transportation systems based on electric vehicle (EV) technology are regarded as the most environmentally sustainable system for modern transport industries. The maximum benefits of EVs can only be realized when the energy required to charge the EVs is obtained from renewable energy sources. This paper presents design and implementation of solar PV-based multi-functional e-Mobility charging system for two and three-wheeler EVs. The charging system is powered by 3 kWp solar PV panels consisting of solar battery charger to charge the auxiliary batteries and an e-Mobility charger to charge the EVs. It proposes a decentralized architecture for solar battery charging systems and EV charging system. The decentralized interleaved architecture does not require inter-converter communication and prevents the possibility of a single point of failure. Interleaving of converters also allows to have a high step-down conversion ratio, reduction in size, weight, and volume of filters, and high output current with low ripple current. To achieve a controlled and regulated output voltage, a digitally controlled algorithm is implemented in TMS320F28027 microcontroller. The proposed system can charge multi-chemistry batteries with multiple output voltage levels. The proposed architecture is experimentally validated and presented in this work.