Enhanced control strategy for grid fed battery assisted induction motor based electric vehicle

Abstract

An effective method for controlling battery power in electric vehicles to improve their interaction with the electrical grid is presented in this research study. A simplistic approach is adopted to provide a viable solution for battery charging from the grid as well as feeding power to the grid whenever required. A rotor flux-oriented mechanical sensorless scheme is presented for induction motor driven electric vehicle. An extensive study is carried out for different operating modes of electrical vehicle viz. motoring and regeneration by utilizing same control mechanism. The motor is controlled by a 3 phase Voltage Source Converter (VSC) and the grid side converter is used for the DC bus voltage regulation. An aiding device for bidirectional power flow is a bidirectional buck-boost converter. The current multiplier approach (CMA) concept controls the bidirectional power flow between the single-phase grid source and the standard DC bus voltage that links to the induction motor driven EV via 3-phase VSC. Furthermore, this method enhances power quality by preserving a unity power factor (UPF) and lowering THD. In addition to outlining the mathematical model and system-wide power management strategy, the study is presented and evaluated using MATLAB/Simulink platform. This work is further validated on hardware setup developed in the laboratory. Real-time test results confirm the system's compliance with different regulatory guidelines viz. IEEE 519–2014 and highlight the enhanced performance of the proposed control strategy for wide range of vehicular operations.