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Energies 2015, 8(12), 13559-13575; doi:10.3390/en81212382

On the Implementation of Variable Speed in Pump-Turbine Units Providing Primary and Secondary Load-Frequency Control in Generating Mode

Department of Hydraulic, Energy and Environmental Engineering, School of Civil Engineering, Technical University of Madrid, C/Profesor Aranguren, Madrid 28040, Spain
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Leonardo P. Chamorro
Received: 3 September 2015 / Revised: 11 November 2015 / Accepted: 17 November 2015 / Published: 1 December 2015
(This article belongs to the Special Issue Hydropower)
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Abstract

This paper analyses different control strategies for the speed control loop of a variable-speed pump-turbine unit equipped with a doubly fed induction generator, operating in generating mode in an isolated power system with high penetration of intermittent renewable energy. The control strategies are evaluated and compared to each other in terms of the amount of water discharged through the pump-turbine and of the wicket gates fatigue while providing primary and secondary load-frequency control. The influence of the penstock length and the initial operating point on the performance of each control strategy is studied in detail. For these purposes, several simulations have been performed with a suitable dynamic model of the pumped-storage hydropower plant and the power system. The results of the paper indicate that a proper control strategy would consist in updating the reference speed according to the power generation schedule and keeping it constant within each scheduling period (typically 1 h). View Full-Text
Keywords: pumped storage hydropower plant (PSHP); variable speed operation; load-frequency control pumped storage hydropower plant (PSHP); variable speed operation; load-frequency control
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sarasúa, J.I.; Pérez-Díaz, J.I.; Torres Vara, B. On the Implementation of Variable Speed in Pump-Turbine Units Providing Primary and Secondary Load-Frequency Control in Generating Mode. Energies 2015, 8, 13559-13575.

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