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Industrial PhD project
by Germán Claudio Tarnowski
StudyNo s080169
Defence
Date & Time: Tuesday 29th May 2012, at 13:00
Location: DTU, Building 341, Auditorium 23
Examiners
Prof. Dr.-Ing. habil. István Erlich
University of Duisburg-Essen, Germany
Dr.-Ing. Markus Pöller
DIgSILENT GmbH, Germany
Associate Professor Arne Hejde Nielsen
DTU
Chairman
Associate Professor Hjörtur Jóhannsson
DTU
Download PhD defence poster
Project period
December 2007 to September 2011
Principal supervisor
Professor Jacob Østergaard,
DTU Elektro, CET
Co supervisors
Dr. Philip Carne Kjær, Chief Specialist
Vestas Wind Systems A/S
Dr. Poul Ejnar Sørensen, Senior Scientist
DTU Wind Energy
Companies in cooperation
Centre for Electric Technology (CET), DTU Elektro and Vestas Wind Systems A/S.
This Industrial PhD project is linked to a Nordic Energy Research (NER) project:
Model Development for Power System Analysis with a substantial wind energy capacity installed in the Nordic grid
Sponsors
Danish Agency for Science and Innovation
Vestas Wind Systems A/S
Short description
The aim of this Industrial PhD project is to develop new methods and solutions for integrating an increased share of Wind Power Generation (WPG) in Power Systems (PS), dealing specifically with the frequency stability problem with high wind power penetration or in islanding situations.
Conventional power plants in PS are responsible for controlling the frequency of the electricity network, whereas actual WPG do not contribute to this control. Additionally, the increase of WPG in the PS is reflected as a decrease of conventional power plants, which makes the grid frequency control more difficult. If the penetration level of WPG increases above certain value, it will become technically difficult and economically expensive to maintain the actual strategy by mean of conventional generation. In new PS architectures with intentional islanding of distribution systems, frequency control becomes a very difficult issue.
Taking the case of the Danish island of Bornholm, about 30MW of WPG is installed in the island among other conventional generators, but still it has been shown that the wind power resources cannot be exploited fully in an island operation. It is necessary to find solutions to the system stability problems in order to allow the integration of significant amounts of WPG in the electric PS. In this Industrial PhD project the Bornholm Island system during island operation will be used as example and experimental platform of an islanded/weakly interconnected network with significant wind power penetration, and the solutions should be verified in this system.
Project goal
The project seeks answers for questions like:
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How should the wind turbine active power output be in island operation and how can wind power generation be coordinated in order to contribute to the frequency stability. |
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What modifications in the Bornholm PS control can be done in order to improve the system operation for frequency control. |
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How should the wind turbines act during large frequency transitions in islanded PS, e.g. during islanding transition. |
Some hypotheses that are to be tested throughout the project are:
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Variable speed wind turbines can contribute with the system frequency control by using inertia response through a supplementary control loop at wind turbine and/or wind farm level. |
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The developed solutions should eliminate the present shedding of wind turbines during island operation of Bornholm, improve frequency quality, enable real-time generation-demand balancing, and improve system stability. |
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The frequency issue can be handled by real-time balancing the wind power production, the conventional power production and, eventually, the demand consumption. The method should interplay with existing activated frequency reserves, be coordinated with demand response and support future innovative PS architecture, e.g. intentional island operation. |
Some activities that are to be carried out during the project are:
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Developing, validating and tuning control algorithms by PS analysis and dynamic simulations. The project will be carried out through extensive use of data, models, computational simulations and equipment within DTU University and Vestas Wind Systems. The developed models should be capable of reproducing wind power generated frequency deviations experienced during island operations. |
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Test of developed solution(s) by full-scale implementation at one or several wind turbines in the power system of Bornholm island (max. load 55 MW and high wind power penetration). |
The project will develop new advanced technical control algorithms for wind turbines to provide active power control, and bring new knowledge about future PS.
The project will increase the knowledge of Vestas Company and DTU University regarding the impact and design of wind turbines power control in future electric PS. The technology can potentially be integrated in all future wind turbines and assist increase the amount of wind power in electric PS.
It is expected to upscale the solutions to a more general field, e.g. future PS with high amount of renewable generation and to contribute with the lack of frequency stability solutions for new energy system concepts.
More information
• Bornholm is saving Denmark from going black.
• Press release - CET 28/9 2007
Contact
Jacob Østergaard, CET, DTU Elektro
2012-04-24 gct |