Author(s): H. Brekke; H. Luras; X. Li
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Keywords: No Keywords
Abstract: The goal of this paper is to present: modern methods for modelling: and stabilizing high head Hydroelectric power plants, with long, and/or complex tunnel and penstock systems. The first part of the paper gives a very brief presentation of the structure matrix method for stability analvsis in the frequency domain. The analysis includes a frictional damping term of the pressure oscillations as function of the frequency and the flow amplitudes. The influence of the turbine characteristics is also included. Frequency response tests in various high head power plants with complex tunnelsystems has proven the accuracy of the theory in the frequency domain. The secondpart of the paper includes a review of different so called water column compensating systems compared with a direct pressure feedback system. For complex conduit systcms the damping effect obtained by throttling of special `selected shafts in the system has been proven. to be a powerful tool. A presentation of a successful use of such system is presented as the third section in this paper.
Year: 1991