Change search
ReferencesLink to record
Permanent link

Direct link
Measuring routines of ice accretion for Wind Turbine applications: The correlation of production losses and detection of ice
Umeå University, Faculty of Science and Technology, Department of Physics.
2010 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Wind power will play a major role in the future energy system in Sweden. Most of the major wind parks are planned to be built in sites where the cold climate and atmospheric icing can cause serious problems. This underlines the importance of addressing these issues. The major cause of these problems is in-cloud icing of the rotor blades due to super cooled liquid droplets of clouds. The droplets freeze upon impact with the rotor blade and form hard rime ice. This rime ice causes disruption in the aerodynamics that leads to production losses, extra loads on the rotor blades and when the ice is shed it poses a safety risk to people in the near environment. This master thesis focuses on how to measure the accretion of ice and the correlation between measured ice and production losses of two wind parks in northern Sweden.


The results show a good correlation between the ice accretion on a stationary sensor and the production loss from a wind turbine. In most icing events the icing of the sensor and large production losses from the wind turbine correlated clearly. Attempts to quantify the production losses at a certain ice rate measured with the stationary sensors was done, however no clear results was produced. The reason for this is that the wind turbines often stop completely during an icing event and that the time series analyzed was too short to be able to quantify the losses at certain wind speed and ice rates.


Recommendations on the type of sensor which should be used was to be produced, however the conclusion was that no single sensor has acted satisfactory and could be recommended to measure ice accretion for wind turbine applications. Due to this, at least two sensors are recommended to increase the redundancy in the measurement system. Modeling ice accretion with standard parameters measured has been done and the results show that the time of icing could be determined quite well when the sensors was ice free, however when the sensors and especially the humidity sensors was iced the time of icing was overestimated.


The main conclusion drawn is that there is a clear relationship between the icing of a stationary sensor and the rotor blade. There is still no which fulfills all demands of measuring ice accretion for wind turbine applications, further it is possible with simple models to roughly determine when icing occurs with standard measurements.

Place, publisher, year, edition, pages
2010. , 137 p.
Keyword [en]
wind power, atmospheric icing, anti icing, de-icing, icing sensors, icing measurements, relative humidity
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Other Engineering and Technologies
URN: urn:nbn:se:umu:diva-37896OAI: diva2:370953
Physics, Chemistry, Mathematics
Available from: 2010-12-12 Created: 2010-11-18 Last updated: 2010-12-12Bibliographically approved

Open Access in DiVA

fulltext(4266 kB)4393 downloads
File information
File name FULLTEXT01.pdfFile size 4266 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Department of Physics
Other Electrical Engineering, Electronic Engineering, Information EngineeringOther Engineering and Technologies

Search outside of DiVA

GoogleGoogle Scholar
Total: 4393 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: 347 hits
ReferencesLink to record
Permanent link

Direct link