Model prediction decomposition control method and device for open-winding five-phase permanent magnet synchronous motor

Abstract

The invention discloses a model prediction decomposition control method and device for an open-winding five-phase permanent magnet synchronous motor. The method comprises the steps of obtaining a voltage component under a static coordinate system under rotor magnetic field orientation; synthesizing a virtual voltage vector capable of offsetting the harmonic space voltage according to the vector distribution of the five-phase permanent magnet synchronous motor under the voltage source inverter; enabling the open winding topology of the five-phase permanent magnet synchronous motor to be equivalent to superposition of independent effects of two inverters; predicting a voltage vector which can be generated by one independent inverter through a mathematical model of the motor to obtain an expected increment as a judgment condition, and determining that the open winding system uses one of the two inverters to keep normal operation of the open winding system; or using the first inverter forclamping, and using the second inverter for generating the remaining increment. The device comprises a program unit corresponding to the method step. According to the invention, the switching loss ofthe open winding driving system can be effectively reduced, and the dynamic response of the control system is improved.

Description

technical field [0001] The invention belongs to the application field of open-winding topology systems of multi-phase motors, and in particular relates to a model predictive decomposition control method and device for five-phase permanent magnet synchronous motors with open windings. Background technique [0002] Five-phase permanent magnet synchronous motor has the advantages of high efficiency, high power density, wide speed range, low torque ripple and strong fault tolerance, and has been widely concerned and applied in aerospace, electric vehicles, ship propulsion systems and other fields. At the same time, the open-winding motor topology system has excellent characteristics such as high output power, various power supply modes and voltage vector modulation methods, flexible control, redundancy and fault tolerance. [0003] Scholars at home and abroad have achieved certain results on the model predictive control method of five-phase permanent magnet synchronous motor und...

AI Technical Summary

Problems solved by technology

The Chinese invention patent "An Optimal Model Predictive Control Method for Dual-Inverter Open-Winding Induction Motor" (Patent No.: CN201910207446.4) discloses a control method optimized for model prediction of dual-inverter open-winding induction motors. Since this method only applies one voltage vector per cycle, it is easy to implement but has poor steady-state performance

Therefore, most of the current open-winding model prediction methods use the same modulation method as the non-open-winding topology system, and cannot make full use of the flexibility and the advantages of various voltage vectors of the open-winding motor drive system.

At the same time, with the increase of the number of motor phases, especially the open-winding five-phase permanent magnet synchronous motor topology system, the switching loss of the drive system doubles after the neutral point is opened, and the control is flexible but complicated

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