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Research Of Switched Reluctance Motor For Marine Electrical Propulsion System

Posted on:2011-09-02Degree:DoctorType:Dissertation
Country:ChinaCandidate:A D XuFull Text:PDF
GTID:1102330332963253Subject:Marine Engineering
Abstract/Summary:PDF Full Text Request
In the recent years,with the rapid development of power electronics,new motor control theory and information technology,marine electrical propulsion technology has get unprecedented development in civilian ship,merchant ship and even military ship.Switched reluctance motor(SRM)has simple structure,low cost and can be controlled flexiblely.It is significant that applying SRM to marine electrical propulsion system.The aim of this paper is to apply SRM as the propulsion motor of propeller on the base of characteristic requirements of the propeller and performance features of SRM.The problems which exist in application will be deeply researched to provide theoretical basis for practical application.Because the model of switched reluctance motor has the characteristics of nonlinearity and strong coupling,a novel modeling method is put forward firstly. This method combines genetic algorithm(GA) with adaptive network based fuzzy inference system(ANFIS) to build mathematical model of inductance and torque. The simulation results test that the new method has the merits of higher precision and strong generalization ability, the convergence speed is improved more than others.Finally the SRM system is simulated with the trained inductance and torque models. Compared with the actual system, the current waves are similar. This proves the new modeling method is correct and feasible.Secondly,as the propeller model with atlas is complex,regression algorithm is adopted to calculate thrust and torque of the propeller.Ship-propeller model is built in the environment of Matlab/Simulink.This provides a basis for the simulation of whole system.Thirdly,all kinds of power converter topologies are carried out for research and their operation principle and feature are analyzed.Considering the topology structure of half-bridge converter, a new method of applying intelligent power module(IPM) to main circuit is presented. It is proved by way of theoretic analysis, PSPICE simulation and practical test that power converter with IPM not only can perform its function very well, but also has the merits of high reliability, strong anti-interference ability, and etc.In additong,in order to decrease torque ripple of SRM, direct instantaneous torque control method whice is used in AC induction motor is introduced into control strategy of SRM.The reason which leads to torque out of control with basic space voltage vector is analyzed, a novel method is proposed for the optimization of the direct controlling torque.It improves the performance of the torque by increasing space voltage vector.At the same time,a hardware platform is established to verify it.Simulation and test are all demonstrate that the proposed scheme is valid for restraining uncontrolled torque and further minimizing the torque ripple.At last,the whole system simulation model is built to simulate the typical working conditions such as start,stop and astern of the ship. What the propulsion motor require under various conditions is analyzed to provide theoretical basis for operation of actual ship.
Keywords/Search Tags:Switched Reluctance Motor, Marine Electrical Propulsion, Fuzzy Neural Network, Direct Instantaneous Torque Control
PDF Full Text Request
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