Optimization Study Of Direct Torque Control For Ship Electric Propulsion System

Because of the advantages of low fuel consumption,good maneuverability and space utilization,the ship electric propulsion technology becomes the main research direction of marine propulsion system.Permanent magnet synchronous motor(PMSM)has the advantages of high efficiency,high power density and good dynamic response,widely used in marine electric propulsion system.The permanent magnet synchronous motor is studied in this paper,and the speed control performance of the DTC system is studied deeply,which provides the theoretical basis for improving and perfecting the PMSM direct torque control technology applied to ship electric propulsion system.Firstly,this paper summarizes the research background and status of direct torque control of marine permanent magnet synchronous motor.Based on the mathematical model of PMSM-DTC,a MATLAB simulation model of DTC based on SVM is built and analyzed respectively.At the same time,a direct torque control experiment platform of permanent magnet synchronous motor has been established,and the software program and hardware debugging were completed.Then,the direct torque control optimization strategy of dual PI SVMDTC and ADRCDTC is proposed respectively,whose principle and mathematical model are analyzed.The applicability of the two optimization strategies is verified by building a MATLAB simulation model.At the end of this paper,a ship electric propulsion system simulation model is built on the basis of oar model with two optimal control strategies put forward.The simulation results show that the proposed two optimal control strategies are applied in the ship electric propulsion system,which has good dynamic and static performance,which verifies the effectiveness of the proposed strategy.