Robust Non-Linear Control of Hybrid Super Capacitor based EV Charger for grid to vehicle and vehicle to grid Application

Abstract

The goal of this work is to design a Super Twisting Sliding Mode Controller (ST-SMC), a robust nonlinear controller technique for electric vehicle (EV) charging systems. In this work, a hybrid supercapacitor (HSC) has been employed as a storage mechanism. Since recent years, hybrid supercapacitors have gained popularity due to their enhanced energy density performance without affecting their power density. The lithium-ion capacitor (LIC) is the advanced hybrid energy storage system that offers benefits such as high energy and power densities, long cycle lives, and a wide range of temperature for operation. Utilising specified fast-charging points and averting full and longer charges, LIC can be employed with Opportunity (OP) charging for an EV during the operation phase. The Grid to vehicle (G2V) and vehicle to grid (V2G) strategies can both use electric vehicle (EV) chargers to effectively connect the grid and the vehicle in a two-way manner. The control of power flow is a difficult task in either of the setups, though. The bi-directional power converter in a BEV charger is controlled by a controller ST-SMC, which tracks the charger's intended current and output voltage in both G2V and V2G operations. A significant weakness in power converters is the chattering effect, which is mitigated by the suggested controller. For the comparison, the robust integral backstepping sliding mode controller (IBS-SMC) is also developed. The Lyapunov stability method is used to examine the system's stability. In the MATLAB/Simulink software, the suggested controllers are simulated. Results confirm the controller's effectiveness under different operating circumstances.