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ISSN (Print): 1872-2121
ISSN (Online): 2212-4047

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Research Article

Influence of Power Factor on the Performance of Bulb Tubular Turbine Generator

Author(s): Hongbo Qiu, Hangyu Shen*, Cunxiang Yang and Ran Yi

Volume 14, Issue 1, 2020

Page: [95 - 102] Pages: 8

DOI: 10.2174/1872212113666190319161154

Price: $65

Abstract

Background: In recent years, many patents have been dedicated to increasing the rated power factor of generators. However, hydro-generators often encounter uncontrollable factors, such as dry season, power network adjustment, and so on, resulting in low power factor operation. In other words, the generator is often in a low power factor operating state. In order to provide data reference for power plant in regulating power factor, it is necessary to analyze the performance of generator in low power factor operation.

Objective: The performance of the generator is analyzed when the power factor decreases, and the influence of low power factor operation on the generator is obtained. Methods: Taking a 24MW bulb tubular turbine generator as an example, a 2D transient electromagnetic field model is established. The correctness of the model is verified by comparing the test data and the simulation data. The torque, eddy current loss and air gap flux density of the generator under different power factor are calculated.

Results: When the power factor deceases from 0.99 to 0.85, the air gap flux density increases from 0.713 T to 0.749 T, the torque ripple increases from 150.5 kN⋅m to 179.9 kN⋅m, and the rotor eddy current loss increases from 17.48 kW to 18.15 kW.

Conclusion: The results show that the torque ripple and eddy current loss will increase with the decrease of power factor when the generator lagging phase operation. The torque ripple and eddy current loss increase by 3.8 % and 1 % respectively with the power factor decrease by 0.02 % with power factor between 0.99 and 0.85.

Keywords: Air gap flux density, bulb tubular turbine generator, eddy current loss, harmonic, power factor, torque ripple.

Graphical Abstract

[1]
K.M.M. Tunç, "Hydropower plants tailwater energy production and optimization In: ", 2015 International Conference on Renewable Energy Research and Applications (ICRERA) Palermo, ITALY,, 2015pp. 181-183
[http://dx.doi.org/10.1109/ICRERA.2015.7418691]
[2]
S.S. Katre, and V.N. Bapat, Zero carbon emission smart pico hydro grid for rural electrification.In 2014 IEEE Region 10 Humanitarian Technology Conference (R10 HTC)., Chennai INDIA, 2014, pp. 11-13.
[http://dx.doi.org/10.1109/R10-HTC.2014.7026310]
[3]
R.H. Li, C.S. Li, X.L. Peng, and W. Wei, Electromagnetic vibration simulation of a 250-MW large hydropower generator with rotor eccentricity and rotor deformation.. Energies, vol. 10, 2017.
[4]
X. Xu, and T, Yang, “Electricity generating method and system”, E.P. Patent 2405128, 2013.
[5]
D. Liu, and Y. Zhao, Environment-friendly tubular turbine. C.N. Patent 106837655, 2017.
[6]
F.J. Garcia, M.K.I. Uemori, J.J. Rocha Echeverria, and E. de Costa Bortoni, "Design requirements of generators applied to low-head hydro power plants", IEEE Trans. Energ. Convers., vol. 30, pp. 1630-1638, 2015.
[http://dx.doi.org/10.1109/TEC.2015.2434617]
[7]
P.J. Donalek, Update on small hydro technologies, and distributed generation including run — of — river plants In 2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, Pittsburgh, PA, USA, 2008, pp. 1-2.
[http://dx.doi.org/10.1109/PES.2008.4596416]
[8]
T. Pham, S. Salon, W. Akaishi, and M. DeBortoli, "Damper bar heating in hydro generators with fractional slot windings In: ", 2017 IEEE International Electric Machines and Drives Conference (IEMDC) Miami, FL, 2017pp. 1-8
[http://dx.doi.org/10.1109/IEMDC.2017.8002022]
[9]
Y. Zhan, K. Kong, G. Xu, and H. Zhao, Damper current analysis of hydro-generators considering interbar currents.In 2017 IEEE Energy Conversion Congress and Exposition., ECCE: Cincinnati, OH, 2017, pp. 3130-3136.
[http://dx.doi.org/10.1109/ECCE.2017.8096570]
[10]
Y.D. Fan, X.S. Wen, H.M. Wang, and J.H. Seo, "Research on stator temperature field of a hydro-generator with skin effect", IET Electr. Power Appl., vol. 5, pp. 371-376, 2011.
[http://dx.doi.org/10.1049/iet-epa.2010.0185]
[11]
Y. Fan, X. Wen, and S.A.K.S. Jafri, "3D transient temperature field analysis of the stator of a hydro-generator under the sudden short-circuit condition", IET Electr. Power Appl., vol. 6, pp. 143-148, 2012.
[http://dx.doi.org/10.1049/iet-epa.2011.0039]
[12]
S. Zhang, W. Li, J. Li, and X. Zhang, "Research on flow rule and thermal dissipation between the rotor poles of a fully air-cooled hydrogenerator", IEEE Trans. Ind. Electron., vol. 62, pp. 3430-3437, 2015.
[http://dx.doi.org/10.1109/TIE.2014.2366723]
[13]
W. Li, C. Guan, and Y. Chen, "Influence of rotation on rotor fluid and temperature distribution in a large air-cooled hydrogenerator", IEEE Trans. Energ. Convers., vol. 28, pp. 117-124, 2013.
[http://dx.doi.org/10.1109/TEC.2012.2220852]
[14]
F. Huo, W. Li, L. Wang, Y. Zhang, C. Guan, and Y. Li, "Numerical calculation and analysis of three-dimensional transient electromagnetic field in the end region of large water–hydrogen–hydrogen cooled turbogenerator", IEEE Trans. Ind. Electron., vol. 61, pp. 188-195, 2014.
[http://dx.doi.org/10.1109/TIE.2013.2244542]
[15]
J. Han, B. Ge, D. Tan, and W. Li, "Calculation of temperature distribution in end region of large turbogenerator under different cooling mediums", IEEE Trans. Ind. Electron., vol. 65, pp. 1178-1186, 2018.
[http://dx.doi.org/10.1109/TIE.2017.2733422]
[16]
Y. Liang, X. Bian, L. Yang, and L. Wu, "Numerical calculation of circulating current losses in stator transposition bar of large hydro-generator", IET Sci. Measur. Technol., vol. 9, pp. 485-491, 2015.
[http://dx.doi.org/10.1049/iet-smt.2014.0230]
[17]
Y. Liang, and Y. Chen, "Circulating current losses analysis and improved incomplete transposition for stator bars in large hydro-generators", IET Electr. Power Appl., vol. 10, pp. 125-132, 2016.
[http://dx.doi.org/10.1049/iet-epa.2015.0158]
[18]
S. Keller, M. Tu Xuan, J-J. Simond, and A. Schwery, "Large low-speed hydro-generators - unbalanced magnetic pulls and additional damper losses in eccentricity conditions", IET Electr. Power Appl., vol. 1, pp. 657-664, 2007.
[http://dx.doi.org/10.1049/iet-epa:20060504]
[19]
Z. Fan, Y. Liao, L. Han, and X. Li-dan, "No-load voltage waveform optimization and damper bars heat reduction of tubular hydrogenerator by different degree of adjusting damper bar pitch and skewing stator slot", IEEE Trans. Energ. Convers., vol. 28, pp. 461-469, 2013.
[http://dx.doi.org/10.1109/TEC.2013.2259628]
[20]
W. Li, J. Han, F. Huo, X. Zhou, Y. Zhang, and Y. Li, "Influence of the end ventilation structure change on the temperature distribution in the end region of large water–hydrogen–hydrogen cooled turbogenerator", IEEE Transactions on. Energy. Conversion., vol. 28, pp. 278-288, 2013.
[http://dx.doi.org/10.1109/TEC.2013.2253104]
[21]
W. Li, D. Li, J. Li, and X. Zhang, "Influence of rotor radial ventilation ducts number on temperature distribution of rotor excitation winding and fluid flow state between two poles of a fully air-cooled hydro-generator", IEEE Trans. Ind. Electron., vol. 64, pp. 3767-3775, 2017.
[http://dx.doi.org/10.1109/TIE.2017.2650871]

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