Model prediction current control method and device for twelve-phase permanent magnet synchronous motor

Abstract

The invention discloses a model prediction current control method and device for a twelve-phase permanent magnet synchronous motor. The method comprises the following steps: constructing a current prediction model of the twelve-phase permanent magnet synchronous motor; acquiring the first d-q axis current value of each winding of the first to fourth three-phase windings at the moment k; constructing a switching state matrix of each converter in the first to fourth converters to obtain the d-q axis voltage values under each switching state combination; obtaining a second d-q axis current valueof each winding at the moment k+1 according to the current prediction model, the first d-q axis current value of each winding and the second d-q axis current value of each winding at the moment k+1; constructing an objective function of each winding, and combining a second d-q axis current value of each winding and a preset current value to obtain driving signals of all bridge arms of the first tofourth converters. According to the invention, the method achieves the high-dynamic current control of a motor, effectively improves the control flexibility and applicability, and is simple and easyto implement.

Description

Technical field [0001] The invention relates to the technical field of motor control, in particular to a model predictive current control method and device for a twelve-phase permanent magnet synchronous motor. Background technique [0002] In recent years, multiphase motors have gradually received more and more attention for their advantages such as high efficiency, low torque ripple, and high fault tolerance. Regarding the control of multi-phase motors, the most mature technology is vector control. In addition, there are more and more researches on direct torque control and MPC (Model Predictive Control). Compared with the first two control methods, MPC has the following advantages: fast dynamic response speed; direct method and can be simply applied to multivariable systems; high flexibility of control, and various nonlinear constraints can be integrated into the control method . However, the MPC method has a large amount of calculation and has relatively high requirements f...

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Problems solved by technology

However, the MPC method has a large amount of calculation and has relatively high requirements for the main control chip, which limits its development for a period of time.

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