Change search
ReferencesLink to record
Permanent link

Direct link
Reactive Power and Voltage Control of Offshore Wind Farms
Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, Department of Electrical Power Engineering.
2014 (English)MasteroppgaveStudent thesis
Abstract [en]

There are several challenges related to reactive power and voltage control of HVAC transmission from offshore wind farms to the main grid, which need to be addressed when designing wind farms. One challenge is the variation of wind speeds and thereby also power production, which can make it difficult to operate the system within the grid code requirements. This Master’s thesis focuses on finding beneficial operating strategies to solve these challenges. Various locations of a static var compensator (SVC) are tested in addition to local regulation on the turbines through voltage source converters (VSCs). To investigate different operational strategies, a simulation model of a system connecting an offshore wind farm to the main grid has been developed in DIgSILENT© PowerFactory. A comprehensive examination of the behaviour of the dynamic voltage control devices has been performed to ensure the desired functionality of the model. Two different approaches for controlling the output of the wind farm have been examined; P-Q operation controls the active and reactive power output, whilst P-V control mode determines the active power and the voltage at the connected node. For these two scenarios, a static var compensator has been implemented on both sides of the transmission cables. Coordination between load tap changers (LTCs) and the static var compensator has been examined, and the active power losses for operating the system with an SVC offshore have been estimated. Simulation results show that the most beneficial operational strategy for the wind farm in both P-Q and P-V control mode is to use an SVC located offshore. This operational strategy provides better voltage control and lower cable currents than the other analysed system structures. Thus, a longer distance to shore is possible without exceeding maximum cable currents. Cable losses are also lower with the SVC implemented offshore. The SVC was barely affected by the taps from LTCs, and coordination issues between these two dynamic components can be considered negligible.

Place, publisher, year, edition, pages
Institutt for elkraftteknikk , 2014. , 144 p.
URN: urn:nbn:no:ntnu:diva-26180Local ID: ntnudaim:11306OAI: diva2:745186
Available from: 2014-09-09 Created: 2014-09-09 Last updated: 2014-09-09Bibliographically approved

Open Access in DiVA

fulltext(3460 kB)3196 downloads
File information
File name FULLTEXT01.pdfFile size 3460 kBChecksum SHA-512
Type fulltextMimetype application/pdf
cover(184 kB)6 downloads
File information
File name COVER01.pdfFile size 184 kBChecksum SHA-512
Type coverMimetype application/pdf

By organisation
Department of Electrical Power Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 3196 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 336 hits
ReferencesLink to record
Permanent link

Direct link