A Method for Constructing Coordinate Transformation Matrix of Multi-phase Motor Under Phase Loss Fault

Abstract

The invention discloses a method for constructing a coordinate transformation matrix under a phase loss fault of a multi-phase motor, which includes the following steps: (1) Constructing a basic specific vector group M 0 ; (2) Construct the first harmonic vector group H Ⅰ ; (3) Construct a specific irrelevant group M once Ⅰ ; (4) Judging and processing a specific irrelevant group M Ⅰ ; (5) Construct the third harmonic vector group H Ⅲ ; (6) Construct three times specific irrelevant group M Ⅲ ; (7) Judging and processing the specific irrelevant group M three times Ⅲ (8) by the method of step (5) to step (7), construct the fifth harmonic vector group H Ⅴ , to construct five specific irrelevant groups M Ⅴ , judging and processing five specific irrelevant groups M Ⅴ ; (9) By analogy with step (8). The present invention is easy to program, and can quickly and accurately obtain the coordinate transformation matrix of any multi-phase motor under any phase loss fault. The obtained coordinate transformation matrix can reduce the dimension of the multi-phase motor, simplify the original model of the multi-phase motor, and can be used for multi-phase Motor fault modeling, fault characteristic signal extraction, fault-tolerant 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

Images