Calculation of Iron Loss in Large Hydro-Generator under Non-Load

Abstract:

Taking 1000MW air-cooled hydro-generator as an example, the solving region and mathematical model are given. Based on the theories of electromagnetic field, the stator iron loss of large generator under non-load is studied. Considering the structural characteristics of generator, the iron loss was calculated by using magnetic circuit method and the finite element method, respectively. First, the iron loss in generator stator is calculated basing on the theory of electromagnetic field. Then the steady state and transient fields were used to calculate and analyze the 2D electromagnetic field by finite element method. And the exact value and distribution of iron loss are obtained. Last, we obtain some useful conclusions through comparing the iron loss calculated by the two methods above. That will provide a theoretical basis for further study of the physical fields of new generation giant hydro-generators.

• Periodical: Advanced Materials Research (Volumes 433-440)
• Pages: 6096-6102
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.433-440.6096
• Online since: January 2012
• Authors: Wei Li Li, Da Wei Liang, Yu Zhang
• Keywords: Hydro-Generator, Iron Loss, Numerical Calculation

References

[1] Li Weili, Ding Shuye, Zhou Feng, and Luo Yingli, The calculation of rotor temperature field for hydro-generator as Well as the analysis on relevant factors, Electromagnetic Field Computation. 2006 12th Biennial IEEE Conference, pp.455-455, June. (2006).

DOI: 10.1109/cefc-06.2006.1633245

[2] Yutian Sun, and Qingfei Gao, The Design and Operation of 700MW Class Totally Air-Cooled Hydroelectric Generators, " EUROCON 2009, EUROCON , 09. IEEE, pp.501-508, July. (2009).

DOI: 10.1109/eurcon.2009.5167679

[3] Li Shufang, Yao Ruoping, and Gao Yougang, Study on electromagnetic field in the region of large generator by FEM, Electromagnetic Compatibility, 1999 International Symposium, pp.456-459, Aug. (2002).

DOI: 10.1109/elmagc.1999.801363

[3] Bai Yannian, Design and calculation of hydro-generator, Beijing Mechanical Industry Press. pp.139-169, (2008).

[4] Giorgio Bertotti. General properties of power losses in soft ferromagnetic material [J], IEEE Transactions on Magnetics, 1998, 24(1): 621-630.

DOI: 10.1109/20.43994

[5] Shikun Chen. Design of electric machine, Beijing Mechanical Industry Press. pp.76-85, (2008).

[6] Martin Ranlöf, Anna Wolfbrandt, Johan Lidenholm, et al. Core Loss Prediction in Large Hydropower Generators: Influence of Rotational Fields [J]. IEEE Transactions On Magnetics, 2009, 45(8): 3200-3206.

DOI: 10.1109/tmag.2009.2019115