One-phase open-circuit prediction current control method for five-phase permanent magnet synchronous motor

Abstract

The invention discloses a one-phase open-circuit prediction current control method for a five-phase permanent magnet synchronous motor. The method comprises steps: 1, a static coordinate transformation matrix adopts a non-decoupled matrix, and the plane and an x-y plane are not orthogonal; 2, the y-axis directional voltage vector of an x-y subplane is selected to be controlled to be zero; 3, according to a voltage-second balance principle, the action time of a corresponding vector can be calculated, at the time, a total of eight non-zero synthesizing vectors can be obtained in the sub plane, and the synthesizing vectors can ensure the y-axis current component of an x-y harmonic plane to be zero, thereby reducing system loss; 4, the above synthesizing vectors are applied; and 5, nine optional vectors are together provided by the zero vector and the eight non-zero synthesizing vectors in the third step. As is know from the above technical scheme, the one-phase open-circuit prediction current control method for the five-phase permanent magnet synchronous motor has the beneficial effects that according to the five-phase permanent magnet synchronous motor one-phase open-circuit prediction control, the synthesizing vectors are applied to model prediction current control after fault, and the prediction current control of the invention has the following advantages that a harmonic termas is described in the specifications is not contained in a cost function, thereby simplifying selection of weight coefficients; and the number of iterations at each sampling time changes from 16 to 9, thereby effectively reducing the computational amount of the system.

Description

technical field [0001] The invention relates to a one-phase open-circuit predictive current control of a five-phase permanent magnet synchronous motor, belonging to the technical field of multi-phase motor control. Background technique [0002] In occasions requiring low voltage, high power and high reliability, compared with traditional three-phase motors, multi-phase motor drive systems have gained more and more attention, such as electric vehicles, ship electric propulsion, all-electric aircraft, wind power generation, etc. . Fault-tolerant performance is a prominent feature of multi-phase motor drive system. When one phase or several phase windings fail, the redundancy of phase numbers can be used to realize the failure through appropriate control strategy without changing the circuit hardware structure. After the disturbance-free fault-tolerant operation. [0003] Motor faults mainly include open circuit and short circuit, and short circuit faults can be equivalent to...

AI Technical Summary

Problems solved by technology

But it also has obvious problems: the amount of online calculation is large; when the cost function contains multiple performance constraints, the design of the weight coefficient is complicated

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