Direct torque control method for six-phase synchronous motor with zero-sequence current self-correction

Abstract

The invention discloses a direct torque control method for a six-phase synchronous motor with zero-sequence current self-correction. The direct torque control method for the six-phase synchronous motor with the zero-sequence current self-correction comprises firstly, performing voltage vector reconstruction based on an idea that a zero-sequence current is equal to zero and accordingly proposing an idea DTC (Direct Torque Control); secondly, performing discrete compensation on the actual voltage vector acting time based on the dead-time compensation principle; finally, continuously compensating the voltage vector acting time through a PI adjuster and achieving a purpose that the zero-sequence current is equal to zero. The direct torque control method for the six-phase synchronous motor with the zero-sequence current self-correction solves the problem of eliminating low-order harmonic currents in a six-phase symmetrical winding permanent magnet motor DTC system of a torque and magnetic flux linkage double-hysteresis-loop structure.

Description

technical field [0001] The invention belongs to the field of multi-phase permanent magnet motor drive control and relates to a direct torque control method of a six-phase permanent magnet synchronous motor. Background technique [0002] As warship and submarine propulsion systems, aerospace propulsion systems, electric / hybrid fuel vehicle drives, electric locomotive traction and other key areas have higher and higher reliability requirements for motor drive systems, traditional three-phase motor drives are becoming more and more difficult to meet the requirements. High-reliability multi-phase motor drive systems are increasingly favored and used in these fields. Common multi-phase motors are divided into induction motors and permanent magnet synchronous motors. Among them, multi-phase permanent magnet synchronous motors have the advantages of high efficiency and fast response speed, and are increasingly becoming a strong competitor of multi-phase induction motors. [0003] ...

AI Technical Summary

Problems solved by technology

Therefore, when the voltage vector is used to achieve high-performance control of electromagnetic torque and stator flux linkage, if the remaining three degrees of freedom lack correct and effective control, it will lead to a decline in the steady-state performance of the direct torque control drive system, such as low-order phase current Harmonic component increases, loss increases, load capacity decreases, etc.

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