Research On PMSM Driving Method And Regenerative Braking Strategy Of Electric Vehicle

Environmental pollution and energy crisis are two major challenges existed in the development of the automotive industry in human society at present.Characters of green,clean economy and long endurance are required by electric vehicles of new era.As a comprehensive solution to solve the short endurance of electric vehicles,the range extended electric vehicle(REEV)has attracted the attention of all parties.It has the advantages of clean and efficient,lower costs,unlimited driving range and without complex mechanical transmission device.Motor drive technology and regenerative braking technology are of great significance to the efficient and green operation optimization of extended range electric vehicles.In terms of the problem of electric drive control technology and regenerative braking for REEV,this paper focuses on the aspects of motor drive control method and regenerative braking optimization control,aiming at improving the comprehensive efficiency of vehicle driving.The research work and innovation of this paper are as follows:1?In order to study the PMSM control method and the basic regenerative braking problem,the power system structure of the REEV,the energy train under the basic working mode and the selection of the driving motor are analyzed.According to the basic theory of the vector control,this paper analyzes the basic way of controlling the three-phase PMSM using the idea of controlling the DC motor,and establishes the mathematical model of PMSM.At the same time,by analyzing the basic braking system principle of REEV,this paper combines motor drive technology and state of art of regenerative braking technology to define the basic research direction.Then,a permanent magnet synchronous motor vector control system based on rotor flux is built.Finally,a simulation experiment is carried out by using PMSM control simulation model in Matlab/Simulink environments.2?As for speed tracking problem of the REEV driving system,this paper combines the robustness characteristics of sliding mode variable structure control and the perturbation and uncertainty problem of IPMSM,and proposes an IPMSM sliding mode observer based speed control method for electric vehicles.This method firstly designs a sliding mode speed controller based on the upper and lower bounds of the perturbation and achieves a better tracking effect.In order to suppress the chattering,sliding mode observer is introduced to observe and compensate the perturbation,and reduces the chattering in the sliding mode controller.Finally,the method is simulated and analyzed under the ECE condition.3?For the problem of regenerative braking control of REEV,a series regenerative braking control strategy is proposed for REEV.The strategy comprehensively considers three factors:the braking safety and stability of the braking system,the maximum torque of the driving motor and distribution of the mechanical braking force and the regeneration braking force.Illustrated by the experimental results of three typical cycle test conditions,the proposed control strategy can effectively enhance the energy recovery capability of electric vehicles while guarantees the stability of vehicle braking.4?In terms of the design problem of PMSM controller for REEV,this paper presents a comprehensive design scheme comprised of hardware and software based on the TI's DSP control suite(HVMTRPFCKIT).Finally,the work and innovation of the whole paper is summarized,and the future research work is prospected.