Five-phase induction motor harmonic loss suppression efficiency optimization control method and control system

Abstract

The invention belongs to the technical field of motor control, and discloses a five-phase induction motor harmonic loss suppression efficiency optimization control method and a control system. The method comprises the steps: taking an equivalent circuit under the orientation of a five-phase motor rotor magnetic field as a basis, introducing an independent iron loss loop, and building a concise d-q fundamental wave space loss model; and eliminating the influence of an x-y harmonic space on the loss model by adopting a harmonic space current closed loop to obtain the efficiency optimization control strategy topology of the five-phase induction motor, and carrying out the harmonic loss suppression efficiency optimization control of the five-phase induction motor. According to the method, the harmonic current closed loop is used for eliminating the harmonic loss influence, the independent iron loss branch is used for simplifying the loss model, the five-phase induction motor loss model with a low calculation burden is obtained, and a corresponding control strategy is provided. Simulation results show that the efficiency of the motor is improved in a steady state, and the influence of a specific harmonic space loss of the multi-phase motor is eliminated to a great extent.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a five-phase induction motor harmonic loss suppression efficiency optimization control method and system. Background technique [0002] At present, thanks to the advantages of low torque ripple, high reliability, low voltage and high power, five-phase induction motors have received more and more attention in the fields of electric ship propulsion, locomotive traction, electric and hybrid electric vehicles, etc. However, the current research on the control algorithm of five-phase motors mainly focuses on the field of phase loss operation and harmonic analysis. There are still large gaps in the field of efficiency optimization. [0003] The common indirect field oriented control topology is given a constant flux linkage amplitude, and still maintains a high excitation component under light load conditions, which leads to serious motor losses while obtaining bette...

AI Technical Summary

Problems solved by technology

The problem is: the model is too complex to uniformly control variables, and only offline table lookup can be performed

The problem is: (1) There is no harmonic space loss in the three-phase induction motor, so it is difficult to directly apply it to the five-phase induction motor

(2) Parallel iron loss branches make the loss model calculation more complicated

However, there are problems with this method: (1) The model can only be applied to the case of lack of phase

(2) The coefficient matrix is ​​measured offline for a specific motor, which is difficult to promote

(3) Neglecting iron loss and harmonic space loss, only copper loss is calculated

[0007]Through the above analysis, the problems and defects of the existing technology are: currently, there is no efficiency of the five-phase induction motor under normal operating conditions and considering the harmonic space loss Optimal Control Strategy

However, the existing efficiency optimization control methods have the following problems: First, the three-phase induction motor uses 3-2 rotation transformation to transform the three-phase natural coordinate system variables into fundamental wave and harmonic subspace for control

Third, the fundamental wave sub-plane and harmonic sub-plane of the five-phase induction motor are perpendicular to each other, and the loss variable cannot be modeled uniformly. It is necessary to properly design the control topology to control or eliminate the influence of harmonics

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