Abstract

At off-design operating points, Francis turbines develop cavitation vortex rope in the draft tube which may interact with the hydraulic system. Risk resonance assessment by means of eigenmodes computation of the system is usually performed. However, the system response to the excitation source induced by the cavitation vortex rope is not predicted in terms of amplitudes and phase. Only eigenmodes shapes with related frequencies and dampings can be predicted. Besides this modal analysis, the risk resonance assessment can be completed by a forced response analysis. This method allows identifying the contribution of each eigenmode into the system response which depends on the system boundary conditions and the excitation source location. In this paper, a forced response analysis of a Francis turbine hydroelectric power plant including hydraulic system, rotating train, electrical system and control devices is performed. First, the general methodology of the forced response analysis is presented and validated with time domain simulations. Then, analysis of electrical, hydraulic and hydroelectric systems are performed and compared to analyse the influence of control structures on pressure fluctuations induced by cavitation vortex rope.

Details

Title
Forced response analysis of hydroelectric systems
Author
Alligné, S 1 ; Silva, P C O 2 ; Béguin, A 1 ; Kawkabani, B 2 ; Allenbach, P 2 ; Nicolet, C 1 ; Avellan, F 3 

 Power Vision Engineering Sàrl, Ecublens, Switzerland 
 Group of Electrical Machines, EPFL, Ecublens, Switzerland 
 Laboratory for Hydraulic Machines, EPFL, Lausanne, Switzerland 
Publication year
2014
Publication date
Mar 2014
Publisher
IOP Publishing
ISSN
17551307
e-ISSN
17551315
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2534468455
Copyright
© 2014. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.