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Energies 2016, 9(3), 199;

Measuring the Dynamic Characteristics of a Low Specific Speed Pump—Turbine Model

Waterpower Laboratory, NTNU, Alfred Getz vei 4, Trondheim 7491, Norway
Rainpower, S.P.Andersen vei 7, Trondheim 7031, Norway
Author to whom correspondence should be addressed.
Academic Editors: Ånund Killingtveit and Juan Ignacio Pérez-Díaz
Received: 29 January 2016 / Revised: 4 March 2016 / Accepted: 7 March 2016 / Published: 15 March 2016
(This article belongs to the Special Issue Hydropower)
Full-Text   |   PDF [706 KB, uploaded 15 March 2016]   |  


This paper presents results from an experiment performed to obtain the dynamic characteristics of a reversible pump-turbine model. The characteristics were measured in an open loop system where the turbine initially was run on low rotational speed before the generator was disconnected allowing the turbine to go towards runaway. The measurements show that the turbine experience damped oscillations in pressure, speed and flow rate around runaway corresponding with presented stability criterion in published literature. Results from the experiment is reproduced by means of transient simulations. A one dimensional analytical turbine model for representation of the pump-turbine is used in the calculations. The simulations show that it is possible to reproduce the physics in the measurement by using a simple analytical model for the pump-turbine as long as the inertia of the water masses in the turbine are modeled correctly. View Full-Text
Keywords: reversible pump-turbine; stability; transient calculations reversible pump-turbine; stability; transient calculations

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Walseth, E.C.; Nielsen, T.K.; Svingen, B. Measuring the Dynamic Characteristics of a Low Specific Speed Pump—Turbine Model. Energies 2016, 9, 199.

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