Stator Non-Uniform Radial Ventilation Design Methodology for a 15 MW Turbo-Synchronous Generator Based on Single Ventilation Duct Subsystem

Ruiye Li, Peng Cheng, Hai Lan, Weili Li, David Gerada and Yingyi Hong
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Ruiye Li: College of Intelligent Systems Science and Engineering, Harbin Engineering University, Harbin 150001, China
Peng Cheng: College of Intelligent Systems Science and Engineering, Harbin Engineering University, Harbin 150001, China
Hai Lan: College of Intelligent Systems Science and Engineering, Harbin Engineering University, Harbin 150001, China
Weili Li: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
David Gerada: Department of Electrical and Electronic Engineering, University of Nottingham, Nottingham NG7 2RD, UK
Yingyi Hong: Department of Electrical Engineering, Chung Yuan Christian University, Taoyuan 320, Taiwan

Energies, 2021, vol. 14, issue 10, 1-20

Abstract: Within large turboalternators, the excessive local temperatures and spatially distributed temperature differences can accelerate the deterioration of electrical insulation as well as lead to deformation of components, which may cause major machine malfunctions. In order to homogenise the stator axial temperature distribution whilst reducing the maximum stator temperature, this paper presents a novel non-uniform radial ventilation ducts design methodology. To reduce the huge computational costs resulting from the large-scale model, the stator is decomposed into several single ventilation duct subsystems (SVDSs) along the axial direction, with each SVDS connected in series with the medium of the air gap flow rate. The calculation of electromagnetic and thermal performances within SVDS are completed by finite element method (FEM) and computational fluid dynamics (CFD), respectively. To improve the optimization efficiency, the radial basis function neural network (RBFNN) model is employed to approximate the finite element analysis, while the novel isometric sampling method (ISM) is designed to trade off the cost and accuracy of the process. It is found that the proposed methodology can provide optimal design schemes of SVDS with uniform axial temperature distribution, and the needed computation cost is markedly reduced. Finally, results based on a 15 MW turboalternator show that the peak temperature can be reduced by 7.3 °C (6.4%). The proposed methodology can be applied for the design and optimisation of electromagnetic-thermal coupling of other electrical machines with long axial dimensions.

Keywords: stator cooling; non-uniform ventilation duct; single ventilation duct subsystem (SVDS); RBFNN surrogate model; isometric sampling method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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