Research And Design On Control System Of Dual Three-Phase Permanent Magnet Synchronous Motor For Ship

Control system of multiphase permanent magnet synchronous motor combines the features of permanent magnet motor and multiphase motor,and bringing the merits of high power with low voltage,high reliability and high control performance,which is widely applied to electric vehicles,marine electric propulsion and other fields.In this paper,dual-three phase permanent magnet synchronous motor(DTP-PMSM)with phase-shift windings displaced by 3 0? for marine is investigated,and its mathematical model,control strategy and system design are developed and presented,which provides an idea for engineering application.The main contents are as follows:Firstly,one mathematical model of DTP-PMSM under rotating frame is established by the theory of generalized coordinates transformation and vector space decomposition(VSD).Then,the multiphase carrier-based PWM method is proposed to overcome the disadvantages of complex calculations when the conventional SVPWM is used to control multiphase machine.Moreover,two control methods based on the fundamental and harmonic space plane are analyzed and investigated to restrain low-order harmonics.Secondly,the other mathematical model of DTP-PMSM under rotating frame is derived by dual synchronous rotating coordinate transformation(the double d-q vector control)according to the structure of stator windings.For this method,two equivalent independent three-phase windings can't be fully decoupled.So coupling voltage compensation is analyzed and deduced,and the control strategy based on voltage compensation is developed on the basis of conventional vector control strategy.Thirdly,simulation models for the preceding control strategies are built by MATLAB/Simulink,and the results validate availability of harmonic current closed loop control and feasibility of decoupling compensation control strategy.Finally,implementation scheme for DTP-PMSM control system are presented and the experiments are carried out on the test bench.Results of contrast experiments between the traditional SVPWM and proposed decoupling compensation method show the effectiveness of the proposed method and the feasibility of the control strategy of two independent voltage source inverters.This above-described method in this dissertation has been successfully used in the project such as ‘the design of driving control system for electric fiberglass fishing vessel'.