Research On Induction Motor Drive System For EV Based On DSPACE

Today, as petroleum is short and environment problem is attracted more and more attention, electric vehicle (EV) research project is launched out.To EV, Motor propulsion system is indispensable, it decides the dynamic performance and affects the residual range of EV. In the preface all kinds of drives system used on electric vehicle is introduced and the process of regulation the speed of motor by Alternating current is narrated.AC asynchronous motor propulsion systemis selected as the concrete study subject. Based on the mathematical model of AC asynchronous motor, this paper uses Matlab/Simulink software to simulate and build electric vehicle direct torque control(DTC) system model, including the flux linkage's observer model of stator, the torque observer model, the select model of voltage space vector, the model of stator's flux linkage's space interval judge, the model of the inverter, the model of speed's PID regulation and the model of motor's model,etc.Through simulation, this paper analyses its dynamic performance targets.This paper introduces dSPACE real time simulation system.It is a software and hardware platform for the real-time control system based on the Matlab/Simulink.lt has the excellent real-time extensible performance and the high reliability.The basic principle of DTC control is analyzed and a real-time control system of the AC asynchronous motor is established in Matlab/Simulink using the rapid control prototype (RCP) method based on the dSPACE. The control parameter can be tuned online so as to adjust the perfommance of real-time system.The experimental results indicate that the feasibility of control algo-rithms can be verified rapidly and the develop period of the control system is also shorten.The whole system acquired satisfactory effect.In the study, a mechanical model is first set up. Based on the mechanical model, electric vehicle simulation model is builded. Further, this paper proves the drivesystem is feasible and effective.The purpose of this study is to set up a control model that can give out the proper torque value to the DTC module, so that the output of the motor propulsion system can meet the driver's requirements.Simulation results verifys that electric vehicle direct torque control system has fine dynamic trait, shows its advantage and validity. Electric vehicle direct torque control system could satisfy the requirement of electric vehicle driving system.