Development of an on-board charger model for real time simulation

Sammanfattning: Electrification of vehicles is now one of the top priorities of automotive manufacturers in orderto comply with the sustainability goals and standards set by the United Nations. One of thedisadvantages faced by electric vehicles is a longer time required for charging the vehicles ascompared to refuelling a conventional vehicle. To speed up the charging, it is necessary toimprove the power rating to charge the vehicle at charging stations. Developing an efficient OnBoard Charger (OBC) that converts Alternating Current (AC) power to Direct Current (DC)power to charge the battery is one of the contributing factors for faster charging. In order to protect the electricity grid from power failures, a bidirectional OBC can beimplemented in the vehicle. This bidirectional OBC is able to transfer power to the electricitygrid as well by discharging the battery. This technique helps to stabilise the grid during highpower demand. Having an efficient OBC ensures minimal losses during power conversion fromthe charging station to the battery in the vehicle. Therefore, this thesis deals with the development of an OBC model to be incorporated ina Hardware in Loop (HIL) simulation. This model is only an emulation of the actual OBChardware for HIL test and is therefore limited. The model is mainly developed in Simulinkand consists of control logic and power conversion stages like Precharge and Power FactorCorrection that successfully imitate the actual hardware. Further, in order to validate the model, it was run in Model in Loop (MIL) simulationwherein the model was tested under scenarios similar to the ones in the HIL setup. A successfulconversion of AC power to DC power was performed and a demonstration of the flexibility andthe adaptability of the model to different test cases is documented in the report. Some of theoutputs of the model are DC current for charging, model stateflow and AC current drawn fromthe grid.