Design and Control of a Transformerless MPPT Based Bidirectional Buck–Boost Converter for Solar Assisted Electric Vehicle Battery Charging

Recent growth in electric vehicle EV deployment has intensified the need for sustainable and renewable energy based charging systems to reduce emissions and dependence on fossil fuels. This paper presents the design and control of a transformerless MPPT based bidirectional buck–boost converter for a solar photovoltaic PV battery powered electric vehicle. The proposed system enables efficient power transfer between the PV array, battery energy storage, and EV drive through bidirectional operation, allowing both battery charging and discharging. Maximum Power Point Tracking MPPT using the Perturb and Observe PandO algorithm is implemented to extract maximum power from the PV array under varying irradiance conditions. A closed loop PI controller is employed to regulate the DC bus voltage at 90 V, ensuring stable EV operation. The proposed transformerless buck–boost topology reduces component count, conduction losses, and overall system cost while maintaining high conversion efficiency. The complete system is modeled and simulated in MATLAB Simulink under irradiance variations of 1000–500–1000 W m² at 25°C. Simulation results demonstrate effective MPPT operation, stable DC bus voltage regulation, smooth battery charging and discharging, and reliable PMDC motor performance, validating the suitability of the proposed architecture for solar assisted electric vehicle applications. Vikesh Kumar Singh | Rajiv Thakur "Design and Control of a Transformerless MPPT-Based Bidirectional Buck–Boost Converter for Solar-Assisted Electric Vehicle Battery Charging" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-9 | Issue-6 , December 2025, URL: https://www.ijtsrd.com/papers/ijtsrd99984.pdf Paper URL: https://www.ijtsrd.com/other-scientific-research-area/other/99984/design-and-control-of-a-transformerless-mpptbased-bidirectional-buck–boost-converter-for-solarassisted-electric-vehicle-battery-charging/vikesh-kumar-singh