Water and Energy Abstracts
Year : 2004, Volume : 14, Issue : 1
First page : ( 45) Last page : ( 45)
Print ISSN : 0021-1672.

124. Hierarchical Modelling of Hydro Power Plants

Ruprecht A.

(Proceedings, Hydro 2003, Vol. I, Croatia, pp. 197–206).

Abstract

A liberalised energy market requires a very flexible operation of hydro power plants. This can lead to high dynamic loads. To investigate the limits of a power plant it is not enough to analyse its dynamic behaviour by means of a usually used 1-D water hammer calculation. Instead specific components have to be investigated in more detail by a 3-D CFD analysis. Since very often the feedback from the 1-D to the 3-D approach and vice versa plays an important role, a hierarchical approach is presented, this means an integrated simulation of the dynamic behaviour of the complete system with a detailed calculation of specific components. As an example the excitation of the water passage by a part load vortex rope in the draft tube is presented. The complete water passage and turbine is modelled by 1-D method of characteristics and the draft tube itself is analysed by unsteady 3-D CFD approach. By coupling the different approaches the feedback from one approach to the other is introduced. This leads to more realistic results and less need of empirical information in the simulation.

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Keywords

Liberalised, Market, Flexible operation, 3-D CFD, Vortex, Simulation.

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