A Novel Universal Model Considering SAGE for MFD-Based Faulty Property Analysis Under RISC in Synchronous Generators

This article proposes a new rotor interturn short circuit (RISC) fault analysis model for the electromechanical property study in synchronous generators. The specific novelty of this model lies in two aspects: First, It considers that most generators exist static air-gap eccentricity (SAGE), so it a...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2022-07, Vol.69 (7), p.7415-7427
Main Authors: He, Yu-Ling, Wang, Yang, Jiang, Hong-Chun, Gao, Peng, Yuan, Xing-Hua, Gerada, David, Liu, Xiang-Yu
Format: Article
Language:English
Subjects:
Air gaps
Circuit faults
Electromagnetic torque (EMT)
Finite element method
Flux density
Generators
Integrated circuit modeling
Magnetic flux
Mathematical models
Mechanical properties
Parameters
Phase current
Reduced instruction set computing
rotor interturn short circuit (RISC)
Rotors
Short circuits
static air-gap eccentricity (SAGE)
Stator windings
synchronous generator
Two dimensional analysis
Two dimensional models
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Summary:This article proposes a new rotor interturn short circuit (RISC) fault analysis model for the electromechanical property study in synchronous generators. The specific novelty of this model lies in two aspects: First, It considers that most generators exist static air-gap eccentricity (SAGE), so it analyzes the RISC fault under normal and SAGE, making the model more versatile, and second, it takes into account not only the short circuit degree, but also the short circuit position, consequently it is more universal. By feeding the number of short circuit turns (denotes the short circuit degree), the angle between the two slots, where the short circuit takes place (denotes the short circuit position) and the detailed parameters of the generator into the model, the developing tendency of the key magnetic flux density (MFD)-based parameters can be conveniently predicted. The advantages of the proposed model primarily lie in the universality and the calculation speed. It can quickly evaluate the generator operating conditions. The phase current and the electromagnetic torque are selected in this article as the representatives of the electrical parameter and the mechanical parameter, respectively. Two-dimensional finite element analysis and experimental studies validate the proposed model.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2021.3094481