Simulation Of Ship Electric Propulsion System Based On Model Predictive Control

Compared to traditional propulsion methods,electric propulsion ships have good maneuverability,higher propulsion efficiency,and can reduce pollution emissions,thus receiving increasing attention.As the core of electric propulsion,propulsion motors usually have two options: synchronous motors and asynchronous motors.Compared to asynchronous motors,permanent magnet synchronous motors have advantages such as high power factor,good safety performance,and low energy consumption,making them the preferred propulsion motor for ship electric propulsion systems.The combination of advanced control theories and methods with the ship electric propulsion system can effectively improve the stability of the ship electric power system operation.The domestic research on the ship electric propulsion system has made some achievements in theoretical research,but there are still many problems in the process of practical application.Therefore,conducting modeling and simulation analysis of ship electric propulsion systems has certain practical significance for discovering and solving problems.This thesis takes a real ship as a prototype,and based on the measured data of the ship,the ship electric propulsion system is modeled in blocks.The propulsion system is divided into three parts,namely,the ship diesel generator set,the propulsion motor and the propeller system.Finally,it is integrated into a complete ship electric propulsion system,and its simulation research is carried out.This thesis mainly completes the following research work:First,through reading the literature,understand the structural characteristics of the electric propulsion system,study the mathematical model of the marine diesel generator set,and use MATLAB/Simulink to build the simulation model of the departure generator set according to the actual ship data.After that,run simulation experiments under a variety of standard working settings and check the generator set model’s accuracy and standardization using the test results,real-world ship data,and performance evaluation indicators.Second,The mathematical model of the motor synchronous is tested and is built by a continuous magnetic motor control model.The model predictive control principle is introduced,and the finite set model predictive current control is chosen as the main control strategy of this thesis,along with the design of the finite set model predictive current controller.The two control strategies of vector control and finite set model predictive current control are compared and analyzed under the same conditions to verify that the designed finite set model predictive current control has certain advantages.Finally,according to the open water characteristics and resistance calculation of the propeller of the real ship,the simulation model of the propeller system is built.Through the study of the starting mode of the propeller,it is concluded that the staged starting is more beneficial to the stability of the ship.Finally,the simulation model generation kit is based on a limited set of current control prediction models.The fan distribution system simulation model connects the units in a specific sequence to form a model Fully simulate the marine electric propulsion system and conduct research simulation.