Research On Vector Control Strategy Of Double Y Shift 30 Degree Six-Phase Permanent Magnet Synchronous Motor

With the rapid development of power electronics,the motor drive systems have got rid of the phase number constraint form traditional three-phase power supply network.Multiphase motors enjoy the advantages of low voltage highpower,low torque pulsation,and good fault tolerant ability.They are suited for application fields such as electric vehicles,wind power generation,and aerospace applications.As a new control technology,multiphase motors drive system are still worthy of studying in theory and practice.In this thesis,double Y shift 30 degrees six-phase permanent magnet synchronous motor(PMSM)is chosen as the study object,the mathematical modeling,vector control and harmonic compensation of the motor are studied.The main contents and research results include:Firstly,The double Y shift 30 degrees six-phase PMSM is modeled by double d-q coordinate transformation and vector space decoupling transform(VSD).By comparing the two modeling methods,it can be seen that when using the VSD transform method,the ?-?,d-q components and the harmonic components of the z1-z2 subspace are closely related to the double d-q transformation method.In the synchronous rotating coordinate system,the current of the z1-z2 subspace is the AC quantity and is not easy to design the controller.Secondly,based on the VSD modeling method,a new type of synchronous rotation coordinate transformation matrix is proposed,which make the components under the fundamental and harmonic subspace both DC components,and the method of harmonic compensation for stator current is analyzed in detail,which lays the foundation for the design of late current controller.Furthermore,compared with the double d-q current vector control algorithm,the vector control of VSD has more flexible control degree of freedom,and can control the subspace and harmonic subspace respectively.In this thesis,a current vector decoupling control algorithm for six-phase PMSM is designed.In addition,in order to eliminate the 5th and 7th harmonic components in the stator current,the resonant controller is connected with PI controller in the z1-z2 harmonic subspace to realize the key compensation for the specific harmonics.Finally,A set of simulation system of current decoupling control strategy based on VSD transform is proposed.the three vector control strategies are simulated and compared,and the validity of the vector decoupling control algorithm is verified.