Design of Nonlinear Control for Single-Phase Battery Electric Vehicle Charger

Abstract

The charging unit of battery electric vehicle is one of the primary subsystem which allows its interconnection with the charging facility. Due to nonlinear behavior of power conditioning circuitry and its sensitivity to external disturbances, robust nonlinear controller is required to achieve various control objectives like output voltage regulation and power factor correction. But many nonlinear controllers like sliding mode and robust integral backstepping can perfectly control the single phase AC to DC power conversion in BEV charger at the cost of chattering. This chattering can cause heat and power losses in BEV charger. In order to resolve this problem, supertwisting sliding mode algorithm based controller has been designed in this paper which not only decreases the chattering but also improves the overall dynamic performance of the system. Various control objectives like unitary power factor and regulation of DC bus voltage, are achieved by the designed ST-SMC. IBS-SMC has also been designed for the control of ACDC power converter in BEV charger. ST-SMC has been compared with robust IBS and other nonlinear controllers for the control of BEV charger. The robustness of the designed controller has been checked by adding external disturbances in the plant. The overall results show the best performance of ST-SMC among other nonlinear controllers in terms of robustness and dynamic performance. Simulations have been performed using Matlab/Simulink ODE 45 environment. To further validate the designed controller for BEV charger, hardware in the loop (HIL) simulations have been done using F28379D dual core microcontroller. HIL simulations have also proved the effectivity of the designed controller for BEV charger