Your browser does not support JavaScript!
http://iet.metastore.ingenta.com
1887

access icon free Internal sudden short-circuit response of a new HSBDS for brushless synchronous machines tested on a 15 MVA generator

© The Institution of Engineering and Technology
Received 09/08/2016, Accepted 25/11/2016, Revised 15/10/2016, Published 01/04/2017

Synchronous generators with brushless excitation have the disadvantage that the field winding is not accessible for the de-excitation of the generator. This means that, despite the proper operation of the protection system, the large de-excitation time constant may produce severe damage in the event of an internal short circuit. This paper describes a novel high speed de-excitation system (HSBDS) aimed at limiting the damage in the synchronous generator in case of an internal short circuit. The HSBDS for these generators was developed and it is in commercial operation. However in a power plant is not possible to test the operation of the HSBDS under sudden short circuit. This paper presents the results of a several tests in a laboratory 15 MVA brushless synchronous machine where internally reduced voltage sudden short-circuits have been performed. As a rated voltage short circuit could damage the laboratory 15 MVA machine, a computer model has been developed in order to assess the performance of the HSBDS in a real short circuit at rated voltage. The HSBDS under sudden short circuit conditions has been evaluated and validated through laboratory tests and computer simulations with satisfactory results.

Inspec keywords: hydroelectric generators; short-circuit currents; synchronous generators; brushless machines; machine protection

Other keywords: protection system; hydrogenerator; power plant; high-speed brushless DS; HSBDS internal sudden short-circuit response; brushless synchronous machine testing; discharge resistor; brushless excitation; synchronous generator damage; de-excitation system; apparent power 15 MVA; de-excitation time constant

Subjects: Synchronous machines

References

    1. 1)
      • 21. Asea Brown Boveri: ‘A method and device for demagnetizing brushless synchronous machines’. International Patent WO93/20614, 1993.
    2. 2)
    3. 3)
      • 30. Technical University of Madrid: ‘Rapid de-excitation system for synchronous machines with indirect excitation’. European PatentPCT/ES2010/000058, 2012.
    4. 4)
    5. 5)
    6. 6)
    7. 7)
    8. 8)
      • 13. Taborda, J.: ‘Modern technical aspects of field discharge equipment for excitation systems’. Proc. of the Power and Energy Society General Meeting, Conversion and Delivery of Electrical Energy, Pittsburgh, PA, USA, 2008.
    9. 9)
    10. 10)
    11. 11)
    12. 12)
    13. 13)
    14. 14)
      • 11. Nøland, J.K., Lundin, U.: ‘Step time response evaluation of different synchronous generator excitation systems’. Fourth IEEE Int. Energy Conf. (ENERGYCON'2016), Leuven, Belgium, April 2016.
    15. 15)
    16. 16)
      • 15. C37.102: ‘IEEE guide for AC generator protection’, IEEE Standard, 2006.
    17. 17)
    18. 18)
      • 20. Siemens: ‘Anordnung zur schnellentregung von bürstenlosen synchronmachinen, die über umlaufende ungesteuerte Gleichrichter erregt warden’. German Patent DE2127497, 1971.
    19. 19)
      • 12. Eshraghnia, R., Kleen, R.J.: ‘Modeling and simulation of the transient response of 138.75 MVA synchronous generator with rotating and static excitation systems’. 2014 IEEE PES T&D Conf. and Exposition, Chicago, IL, USA, 2014, pp. 1–5, doi: 10.1109/TDC.2014.6863369.
    20. 20)
    21. 21)
      • 24. Xianming, C., Wei, W., Hongshui, L., et al: ‘New alternating current de-excitation for large hydraulic generators’. Proc. of the Power System Technology and IEEE Power India Conf., India, 2008.
    22. 22)
    23. 23)
      • 23. Wilhelmsson, H., VG Power AB: ‘Rotating exciter equipped with thyristors offers fast regulation characteristics and a carbon dust free operation’. HydroVision, 2013.
    24. 24)
      • 14. Rouached, B., Bergeron, M., Cros, J., et al: ‘Transient fault responses of a synchronous generator with a coupled circuit model’. 2015 IEEE Int. Electric Machines & Drives Conf. (IEMDC), Coeur d'Alene, ID, 2015, pp. 583–589, doi: 10.1109/IEMDC.2015.7409117.
    25. 25)
    26. 26)
    27. 27)
      • 19. Schneider: ‘Entregungsschaltung für bürstenios über rotierende dionen erregte synchronmaschinen’. German Patent DE1763299, 1971.
    28. 28)
    29. 29)
    30. 30)
      • 22. Westinghouse: ‘Fast de-excitation brushless exciter’. American Patent US4152636, 1979.
    31. 31)
    32. 32)
http://iet.metastore.ingenta.com/content/journals/10.1049/iet-epa.2016.0525
Loading

Related content

content/journals/10.1049/iet-epa.2016.0525
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading
Print this page
This is a required field
Please enter a valid email address