Research On MPTC Strategy Of Marine PMSM

Marine electric propulsion technology has become the mainstream of ship propulsion technology with its excellent characteristic.As the optimal choice for marine electric propulsion motor,permanent magnet synchronous motor is an important research direction of marine electric propulsion technology.There are two ways to study marine electric propulsion technology for improving its performance,optimizing the motor control strategy and simplifying the motor equipment.Model predictive torque control(MPTC)is a control strategy aiming at the optimal voltage output vector,and it has extensive research prospects in the field of motor control.Therefore,it is of far-reaching significance to study the MPTC strategy.Firstly,learned the principle of MPTC,and studied the predictive model,cost function,voltage vector set,etc.Compared with the traditional direct torque control,analyzed the difference between MPTC strategy and direct torque control strategy.At last,based on the simulation model of the marine propulsion motor,the simulation experiment was carried out to verify the effectiveness of the MPTC,and the value and significance of the research MPTC research were analyzed.Secondly,researched speed sensor-less technology based on MPTC.Aiming at the current methods for speed identification of surface-mounted permanent magnet synchronous motor,the research focused on sliding mode observer and extended Kalman filter algorithm.Analyzed the influence of parameters on the identification result of these two speed identification algorithms,and carried out simulation experiments to verify the advantages and disadvantages of these two speed identification algorithms.At last,according to the characteristics of these two speed identification algorithms,proposed a comprehensive speed identification algorithm.Then,in order to solve the overshoot problem of MPTC,studied the active disturbance rejection control(ADRC)technique and learned the principle of speed tracking differentiator,extended state observer and nonlinear error feedback controller.Analyzed the effects of nonlinear functions,filtering factors,speed factors and state observer gains on the ADRC.Combined the ADRC with the MPTC strategy to improve the dynamic response performance of the MPTC strategy and suppress overshoot.Finally,based on the Matlab/Simulink simulation platform,built the marine electric propulsion system under the MPTC strategy combined with the ADRC technology and the speed sensor-less technology.Combined with the actual situation during the navigation process of the marine,the simulation experiment of the marine electric propulsion system under different operation conditions of the marine was carried out.The experimental results showed that the MPTC strategy had improved performance in both dynamic performance and steady performance compared with the traditional control strategy.The improved speed sensor-less technology had good robustness and accuracy.The improved MPTC strategy was theoretically feasible in marine electric propulsion control.