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  Excitation of torsional oscillations in generator shaft lines by plasma feedback control

Sihler, C., Huart, M., Stobbe, F., Streibl, B., Treutterer, W., & Joswig, A. (2003). Excitation of torsional oscillations in generator shaft lines by plasma feedback control. Fusion Engineering and Design, 66-68, 1061-1064. doi:10.1016/S0920-3796(03)00275-8.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-23B8-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-23B9-C
Genre: Journal Article

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 Creators:
Sihler, C.1, Author              
Huart, M.1, Author              
Stobbe, F.2, Author              
Streibl, B.1, Author              
Treutterer, W.1, Author              
Joswig, A.3, Author
Affiliations:
1Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
2Tokamak Scenario Development (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856321              
3Universität Dortmund, Lehrstuhl für Elektrische Maschinen, Antriebe und Leistungselektronik, Emil-Figge-Strae 70, D-44227, Dortmund, Germany, ou_persistent22              

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Free keywords: 22nd Symposium on Fusion Technology (SOFT 2002), Helsinki, 2002-09-09 to 2002-09-13
 Abstract: The ASDEX Upgrade (AUG) tokamak requires an electrical power up to a few hundred MVA for a time period of 10–20 s. The power and energy is provided by three separate networks based on flywheel generators. In 1999, during a routine check performed on generator EZ3, it was discovered that coupling bolts of the flywheel generator shaft were deformed. Given that the active load of the generator (~100 MW) in service is well below the design value of the shaft (~800 MW), the damages may only be explained by a torsional resonance of the shaft line, itself excited by active power transients from the converter loads. A value of 23.6 Hz was calculated for the first eigen-frequency of the shaft line. Frequencies between 10 and 30 Hz have been identified in the spectrum of the load curves. Since torsional shaft oscillations are characterised by very low damping, torsional resonance can become dangerous even for over-dimensioned generator shafts. Therefore, a novel `torque' measurement system was installed. The paper presents results from calculations and measurements showing that devices capable to measure the stress in the shaft line are essential for generator protection in feedback controlled fusion experiments.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -

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Title: Fusion Engineering and Design
  Alternative Title : Fusion Eng. Des.
Source Genre: Journal
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Publ. Info: Copyright © 2003 Elsevier B.V. All rights reserved
Pages: - Volume / Issue: 66-68 Sequence Number: - Start / End Page: 1061 - 1064 Identifier: -