Three-Dimensional Space Vector Model Predictive Control Of Open-Winding Permanent Magnet Synchronous Motor

Open winding permanent magnet synchronous motor uses dual inverters for power supply,reducing the capacity of a single inverter,while achieving multi-level modulation.It has advantages such as high DC voltage utilization,high power density,and small current distortion,and can be applied to wind power generation and electric vehicle drive fields.In this paper,a common DC bus type dual inverter open winding permanent magnet synchronous motor system is taken as the research object.Aiming at the multivariable constraints existing in open winding motors and the zero sequence current problems caused by the common DC bus,an improved model predictive control strategy based on three-dimensional space vector modulation is proposed,which reduces the computational complexity and implementation difficulty of the control algorithm,and effectively reduces the electromagnetic torque ripple of open winding permanent magnet synchronous motors,the zero sequence current is suppressed.The specific research content is as follows:The mathematical model of open winding permanent magnet synchronous motor is established,and the spatial voltage vector distribution characteristics and the causes of zero sequence current generation of open winding permanent magnet synchronous motor with common DC bus type dual inverters are analyzed.Based on model predictive control technology,a control strategy for open winding permanent magnet synchronous motor is designed,and the effectiveness of the designed control strategy is verified through simulation,effective control of the motor and suppression of zero sequence current are achieved.To improve motor driving performance,an duty cycle model predictive control strategy based on three-dimensional spatial coordinate operation is proposed.In the threedimensional spatial coordinate system,coordinate operations are used to correct the voltage vector action time,further reducing the error between the reference voltage and the selected voltage.The calculation process of the voltage vector action time is also more concise,effectively solving the problem of lengthy model prediction process caused by excessive voltage vectors in open-winding permanent magnet synchronous motors,and overcoming the difficulty of complex weight factor adjustment in traditional model predictive control.A multi vector model predictive control method for open winding permanent magnet synchronous motors based on three-dimensional space division is proposed.A threedimensional space is established and divided into regions in a three-phase static coordinate system.By judging the region of the reference voltage vector,multiple vectors are quickly selected,and the vector action time is calculated using spatial coordinate calculation and vector synthesis rules.The simulation results show that this method can quickly screen the effective voltage vectors,reduce the computational complexity and application complexity of the algorithm,and can suppress electromagnetic torque ripple and zero sequence current of the motor.Based on the d SPACE real-time simulation system,an experimental platform for open winding permanent magnet synchronous motors was constructed,and the proposed duty cycle model predictive control strategy based on three-dimensional spatial coordinate calculation was experimentally verified.The experimental results demonstrate the effectiveness of the proposed control strategy in improving the steady-state performance of the motor and suppressing zero sequence current.