Electric Vehicle Regenerative Braking Transient Analysis And Control Strategy Research

The rapid development of global economy brings people a great deal of material civilization and spiritual pleasure,at the same time,it also brings huge natural environment damage and destruction,environmental protection problem has become the focus problem for us.At present,the traditional automobile emissions increasingly serious environmental problem,pollution-free electric vehicles has become the mainstream of the new energy strategy research direction for most countries.Electric vehicles has a lot of shortages such as the cost problem,the construction of supporting facilities,short range,etc.Among them the short range is the biggest obstacle to electric vehicle technology development,regenerative braking is one of the important breakthrough to solve this problem.During the process of electric vehicle braking based on permanent magnet synchronous motor,that can implement energy recovery through battery torque in theory.However,the regenerative braking energy recovery effect is not significant at present,one of the reasons is that the electric energy transformed by mechanical energy would consume on the system reactive power,so it can’t be transformed into active power to the power battery pack charging when the motor is decelerating.In addition,the vehicle braking process is very short,analysis of energy feedback effect of braking through the steady effect of motor is not appropriate.This dissertation introduces the electric vehicle regenerative braking system’s structure and mathematical model of permanent magnet synchronous motor,analyses transient barking process of the electric car permanent magnet synchronous motor,gives out the parameters change process of Speed loop and torque loop error regulator in vector control strategy,discusses the cause of reactive power loss and the solution of it,put forward the corresponding control strategy.Using Matlab/simulink simulation platform Electric vehicle regenerative braking system based on permanent magnet synchronous motor,the simulation results show that the proposed control strategy can effectively improve the efficiency of energy feedback.