Method for constructing coordinate transformation matrix of multiphase motor under an open-phase fault

Abstract

The invention discloses a method for constructing a coordinate transformation matrix of a multiphase motor under an open-phase fault, comprising the following steps: (1) constructing a basic vector group M0; (2) constructing a first harmonic vector group HI; (3) constructing a first specific irrelevant group MI; (4) determining and processing the first specific irrelevant group MI; (5) constructing a third harmonic vector group HIII; (6) constructing a third specific irrelevant group MIII; (7) determining and processing the third specific irrelevant groups MIII; (8) according to the method inthe steps (5) to (7), constructing a fifth harmonic vector group HV and a fifth specific irrelevant group MVs, and determining and processing the fifth specific irrelevant group MV; (9) analogizing according to the step (8). The method is easy to realize, and can quickly and accurately obtain the coordinate transformation matrix of any multiphase motor under any open-phase fault. The obtained coordinate transformation matrix can reduce the dimensionality of the multiphase motor, simplify the original model of the multiphase motor, and can be used for multiphase motor fault modeling, fault characteristic signal extraction, fault tolerance control.

Description

technical field [0001] The invention belongs to the field of motor fault diagnosis and fault-tolerant control, and relates to a method for constructing a coordinate transformation matrix under a phase-lack fault of a multi-phase motor. Background technique [0002] Under complex and changeable working conditions, open-circuit faults of one or even several phase windings of multi-phase motors may occur, and some faults may eventually be equivalent to open-circuit faults of one or several phase windings. To implement effective relay protection, fault diagnosis and fault-tolerant control for multi-phase motors, it is necessary to deeply understand the dynamic characteristics of multi-phase motors under phase loss faults. For this reason, it is necessary to establish a dynamic mathematical model under the phase loss fault of multi-phase motors. [0003] The traditional phase loss modeling of multi-phase motor is based on the normal Park model of multi-phase motor and introduces...

AI Technical Summary

Problems solved by technology

The traditional method is to obtain the coordinate transformation matrix by solving the vector equation system, but the solution of the vector equation system is not unique, and there is no general solution expression

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