Industrial PhD programme
by Rasmus Schmidt Olsen
Study no s052410
Defence
Date & Time:
Thursday, 12. December 2013, at 13:00
Location:
DTU, Building 308, Auditorium 11
Examiners:
Associate Professor Claus Nygaard Rasmussen, DTU Elektro
Professor Aleksandra Rakowska, Poznan University of Technology
Chief Specialist, PhD Troels Stybe Sørensen, Dong Energy
Chairperson at defence:
Researcher Guangya Yang, CEE, DTU Elektro
Download thesis: 
Period
15th August 2010 to 14th August 2013
Principle supervisor
Joachim Holbøll, CEE, DTU Electrical Engineering
Co-supervisor
Unnur Stella Gudmundsdottir, Energinet.dk
Purpose
This PhD project, which is a collaboration between DTU and Energinet.dk, aims at securing the technical and scientific background for optimal utilisation of the future Danish cable based transmission system.
The project is to develop methods and tools which enables the possibility of:
- Increasing the utilisation of cables' current carrying capacity
- Determining the probability of faults on cable systems
- Minimising the cross section of cables embedded in large cable systems
- Giving the background for decision making during faults and emergencies
- Enabling asset management of cables
The background of the project is the politically decided undergrounding of the transmission system, as well as the expected high penetration of fluctuating renewable electricity generation.
Content
The ordinary static principle of calculating the loadability of transmission cables is conservative and will therefore give an insufficient utilisation of the current carrying capacity.
Furthermore the large fluctuations in transported current, arising with high penetration of renewable energy, require the inclusion of dynamic models, which also takes into account the varying surrounding conditions.
The PhD project should therefore include analysis of
- General static conditions in and around cables
- Varying conditions of cable surroundings
- Varying cable loadings
- The effect of hot spots on the loadability
Scope
The developed methods should be able to help the cable operator in making decisions, both during planning of new cable installations and during the operation of transmission cables.
The outcomes of this PhD project can result in large economic savings, as invest-ments in new cable systems can be minimised as well as the costs of the daily operation of the transmission system can be reduced significantly.
Further information
2013-12-04 rso