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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Ruiye Li & Peng Cheng & Hai Lan & Weili Li & David Gerada & Yingyi Hong, 2021. "Stator Non-Uniform Radial Ventilation Design Methodology for a 15 MW Turbo-Synchronous Generator Based on Single Ventilation Duct Subsystem," Energies, MDPI, vol. 14(10), pages 1-20, May.
  • Handle: RePEc:gam:jeners:v:14:y:2021:i:10:p:2760-:d:552598
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    References listed on IDEAS

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    1. Ruiye Li & Peng Cheng & Yingyi Hong & Hai Lan & He Yin, 2020. "Design Synchronous Generator Using Taguchi-Based Multi-Objective Optimization," Energies, MDPI, vol. 13(13), pages 1-18, June.
    2. Abram Dorfman & Zachary Renner, 2009. "Conjugate Problems in Convective Heat Transfer: Review," Mathematical Problems in Engineering, Hindawi, vol. 2009, pages 1-27, October.
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    Cited by:

    1. Federica Graffeo & Silvio Vaschetto & Alessio Miotto & Fabio Carbone & Alberto Tenconi & Andrea Cavagnino, 2021. "Lumped-Parameters Thermal Network of PM Synchronous Machines for Automotive Brake-by-Wire Systems," Energies, MDPI, vol. 14(18), pages 1-18, September.
    2. Junci Cao & Hua Yan & Dong Li & Yu Wang & Weili Li, 2021. "Influence of the Variable Cross-Section Stator Ventilation Structure on the Temperature of an Induction Motor," Energies, MDPI, vol. 14(17), pages 1-17, August.
    3. Christopher Micallef, 2022. "Thermal Management in Electrical Machines," Energies, MDPI, vol. 15(4), pages 1-2, February.

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