Research On Regenerative Braking Control Of Electric Vehicle Based On Permanent Magnet Synchronous Motor

The emissions of traditional vehicles have become a more and more prominent contradiction with the environmental protection nowadays.An important way to solve the contradiction between the development of automobile industry and low-carbon energy-saving is to develop new energy vehicles represented by pure electric vehicles.One of the major bottlenecks limiting the rapid spread of electric vehicles is their limited driving mileage.On the premise that battery technology has not been substantially solved,the development of regenerative braking energy feedback technology has a positive significance for energy saving and emission reduction,and it can effectively extend the driving mileage.of electric vehicles,but the braking stability and the regenerative braking energy recovery rate are still important factors limiting the development of electric vehicles.Aiming at this problem,this paper mainly studies the energy recovery efficiency of permanent magnet synchronous motor in braking of electric vehicle.Firstly,this paper analyses the necessity of the research of electric vehicle and regenerative braking technology,and makes a brief analysis of the research status of this issue.Secondly,the regenerative braking system model of electric vehicle based on permanent magnet synchronous motor(PMSM)is established in MATLAB/Simulink environment.The hybrid energy storage system with bidirectional DC/DC converter is analyzed in detail.The principle of PMSM with inverters is analyzed,and the direct torque algorithm based on SVPWM is applied to speed control.Thirdly,this paper analyses the regenerative braking feedback theory.Because the automobile braking system has the characteristics of nonlinearity,time-varying and complexity,and the fractional order PI~?D~?control method has better control accuracy and robustness than the integer order PID control method,this paper applies the fractional order PI~?D~?control method to the automobile regenerative braking system,and optimizes its parameters through particle swarm optimization(PSO)to ensure the system energy recovery is efficient and reliable.Finally,the regenerative braking system is experimentally analyzed in this paper.Through the simulation analysis and experiment,the simulation analysis and experimental results show that the fractional order PI~?D~?control method has the advantages of short adjustment time,small overshoot,strong robustness and high efficiency of braking energy recovery.At the same time,the rationality and feasibility of regenerative braking energy feedback technology in the new electric vehicle braking system are verified.