Research On Modulation Strategy Of Dual Three-phase Permanent Synchronous Integrated Starter And Generator Motor In Electric Vehicle

With low-voltage large-power and fault tolerance, dual three-phase permanentmagnet synchronous starter generator is particularly suitable for electric vehicles.This dissertation is based on the dual three-phase PMSM starter generator controlsystem focused on modulation strategy, electric starter, constant voltage controlstrategy and torque ripple.First, the dual three-phase PMSM with special distribution of winding usingvector space decomposition simplifies the six-dimensional system voltage andcurrent vector into three mutually orthogonal subspaces. With divid ing sectors inthe d-q subspace and selection of synthetic vectors and arranging the order of theswitch vectors, this paper contrast12-sector and24-sector SVPWM technique ofswitching times within each cycle and the effects of harmonic content.Secondly, the simulation of modulation strategy, electric starter strategy,constant voltage control strategy and system model carried out on Simulink analys isthe trajectory of voltage and current vectors in d-q subspace and phase currentwaveforms.Then, combined with the ISG application background, the simulation of dualthree-phase PMSM starter generator system carried out on Simulink show therelationship between the stator current harmonic and modulation ratio and offer theprinciple of choosing between12-sector and24-sector SVPWM. In addition, withthe ISG starting at a low speed, this paper analys is torque ripple between the twomodulation strategies.Finally, the experimental study of dual three-phase PMSM ISG system controlstrategy, electric starter, constant voltage control strategy verify the feasibility ofthe modulation strategy and system control methods.