Linear Active Disturbance Rejection Control Of Electrically Excited Synchronous Motor Based On MTPA Control Strategy

With the development of science,electric vehicles have become one of the fields of rapid development in the direction of new energy.As an important part of electric vehicle propulsion system,motor has great research value and application prospect.Electrically excited synchronous motor(EESM)is excited by direct current through rotor winding,which gets rid of dependence on rare earth materials and has great advantages in environmental and economic aspects.In addition,the rotor excitation current is flexible and adjustable,which can provide large starting torque and high speed weak magnetic properties,which has unique performance advantages in electric vehicle applications.With the support of the National Natural Science Foundation of China Youth Science Foundation Project(52002155),this paper mainly applies the joint simulation technology to the vector allocation of the motor control system,current loop control and motor digital control system are studied.The main elements are as follows:1.In view of the different characteristics of stator inductance of direct-alternating shaft of salient pole EESM,the maximum torque per ampere(MTPA)strategy is applied to control the motor,which can comprehensively consider the electromagnetic torque and reluctance torque of the motor,and effectively improve the torque performance of the motor and the efficiency of the control system.At the same time,an efficient current distribution strategy can be realized in the constant torque region,so as to reduce motor loss and improve the efficiency of the drive controller.2.According to the high order and strong coupling characteristics of electrically excited synchronous motor,linear active disturbance rejection control(LADRC)algorithm is used to control EESM.Firstly,a linear active disturbance rejection controller is designed for the current loop of the motor control system.Then,based on the known parameters of the motor,a model-assisted linear extended state observer model-assisted linear extended state observer(MA-LESO)is designed,which can improve the observer’s observation accuracy of the disturbance,so as to observe and eliminate the disturbance variables more accurately.The simulation results show that the motor has less fluctuation in steady state,the anti-interference performance is enhanced when the load is loaded,and the motor is relatively stable during operation.3.The finite element model of EESM was designed in Maxwell,and the control algorithm was verified by Simulink-Simplorer-Maxwell co-simulation.By using cosimulation technology to simulate the motor control system,the electromagnetic and electrical properties of the motor can be considered comprehensively,which is more close to the actual motor control system.4.Finally,the related hardware circuit is designed,the experimental platform of EESM is built,and the proposed control algorithm is verified experimentally.The experimental results show that the motor has good steady-state performance and dynamic response performance using the MTPA control strategy and LADRC theory.