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

Eve Cathrin Walseth, Torbjørn K. Nielsen and Bjørnar Svingen
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Eve Cathrin Walseth: Waterpower Laboratory, NTNU, Alfred Getz vei 4, Trondheim 7491, Norway
Torbjørn K. Nielsen: Waterpower Laboratory, NTNU, Alfred Getz vei 4, Trondheim 7491, Norway
Bjørnar Svingen: Waterpower Laboratory, NTNU, Alfred Getz vei 4, Trondheim 7491, Norway

Energies, 2016, vol. 9, issue 3, 1-12

Abstract: 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.

Keywords: reversible pump-turbine; stability; transient calculations (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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