Research On Four Vector SVPWM Control Of Six-phase Induction Motor

For the problem of rotor loss and low power quality in the traditional control strategy of six-phase induction motor,a six-phase induction motor four-vector SVPWM control strategy is proposed.A four-vector SVPWM(Voltage Space Vector PWM)algorithm groups the switching states of the VSI(Voltage Source Inverter)into multiple vectors that identify 64 available switching states,each of which can be derived from the vector and DC bus voltage.Obtaining,decoupling the Clark transformation matrix maps the phase voltage into two stationary subspaces.The four-vector SVPWM control can greatly optimize the phase current and reduce the current harmonics to achieve the purpose of improving power quality.The six-phase induction motor adds a three-phase star-symmetric winding to the three-phase induction motor,and the added three-phase winding has the same electrical angular difference in space from the original three-phase winding.The six-phase induction motor can effectively eliminate six components in the torque ripple,but the rotor current harmonic component of the motor will affect the rotor loss,thereby reducing the power quality of the system.Compared with the traditional two-vector SVPWM,the four-vector SVPWM mainly increases the tracking adjustment of the harmonic current in the x-y subspace,thereby improving the power quality of the motor.In the actual modeling,because the modules given by MATLAB are mostly three-phase modules,this paper studies the control problem of the four-phase induction motor four-vector SVPWM algorithm,mainly doing the following research:1.Set up the voltage,current and flux linkage model of the six-phase induction motor.A six-phase induction motor simulation model was established,and the simulation analysis was carried out.The waveforms of the motor torque,stator phase current and harmonic current were observed.The simulation analysis proves that the motor model is effective.2.The basic principle of SVPWM control algorithm is calculated and analyzed by a large number of formulas.The calculation process of SVPWM rule is deduced.The working principle of SVPWM is further explained by formula calculation,and the action time of basic space vector of each sector of SVPWM is given,a comprehensive description of the concept of the sector.3.By referring to the traditional three-phase induction motor SVPAM control model,the two-vector SVPWM control model of the six-phase induction motor is derived,and the six-phase two-vector SVPWM control model is established in simulink.In the simulation process,the shortcomings of the traditional two-vector SVPWM are found,and then the four-vector SVPWM control algorithm model is established,which increases the adjustment of the voltage of the x-y subspace.Through the simulation analysis of the built simulation model,it is found that the four-vector SVPWM control of the six-phase induction motor has a significant improvement on the stator harmonic current compared with the two-vector SVPWM,which improves the power quality of the motor.