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An Efficient AC Drive Scheme for Electric Vehicles

E. Elbakush, A. M. Sharaf

This paper presents an efficient stabilized AC Drive-Switched Capacitor Filter Compensation Scheme (SFC) for an electric vehicle (EV) using a squirrel-cage induction motor. The dynamic modelling and coordinated control strategy for the integrated-DC side switched filter-compensation scheme (SFC) with energy-recovery is fully validated for a hybrid power supply using a Lithium-Ion battery and fuel cell (FC) on the DC side with a 6-pulse VSI-inverter fed Induction motor drive. The integrated DC/AC Induction motor drive is stabilized using a hybrid SFC that ensures a fully stabilized DC Bus voltage with reduced inrush current conditions under DC side supply source and load excursions. The Lithium-Ion battery and fuel cell sources are utilized efficiently using a novel multi regulator, error driven and multi loop control strategy. The hybrid switched filter compensator is equipped with a tri-loop weighted modified PID (WMPID) controller to ensure full DC Bus stabilization and minimal inrush current conditions as well as energy recovery under deceleration and load excursions. The paper presents the validation of the DC side filtercompensation scheme and coordinated control strategy for the AC voltage source inverter using decoupled torque and flux loops of the three-phase squirrel-cage induction motor. The AC Induction motor is controlled by the first controller for different operating conditions using the direct torque control (DTC) technique, while the second controller is used to stabilize the DC common Bus and ensure energy recovery with minimal inrush current conditions. The unifiedDCAC Drive system ismodelled using MATLAB/Simulink/ Sim-power software environment.