Change search
ReferencesLink to record
Permanent link

Direct link
Tip Speed ratio control of a 200 kW VAWT with synchronous generator and variable DC voltage
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2013 (English)In: Energy Science & Engineering, ISSN 2050-0505, Vol. 1, no 3, 135-143 p.Article in journal (Refereed) Published
Abstract [en]

A novel control method for a fixed-pitch variable speed wind turbine is introduced and experimental results are presented. The measured absorbed power and rotational speed, together with a look-up table for the aerodynamic efficiency, are used to estimate the wind speed reaching the turbine as well as the tip speed ratio. Thereby, the control is independent on wind speed measurements and the wind turbine itself is used as an anemometer. Tip speed ratio control is implemented by comparing the estimated tip speed ratio to a reference value and adjusting the DC voltage level accordingly. Tip speed ratio control benefits from that the aerodynamic efficiency hardly varies with changing tip speed ratio when close to its optimum value. Experimental results from a 200 kW vertical axis wind turbine are presented. The voltage from the permanent magnet generator is passively rectified and the alternating DC voltage is then inverted, filtered, transformed, and grid connected. The estimated wind speed is compared with the measured wind speed. The absorbed power when tip speed ratio control has been implemented is shown. It is concluded that the presented control method works and some future improvements are discussed.

Place, publisher, year, edition, pages
2013. Vol. 1, no 3, 135-143 p.
Keyword [en]
control method, wind turbine, variable speed, H-rotor, experiments
National Category
Energy Systems Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:uu:diva-182437DOI: 10.1002/ese3.23ISI: 000209695200004OAI: oai:DiVA.org:uu-182437DiVA: diva2:559758
Available from: 2012-10-10 Created: 2012-10-10 Last updated: 2016-12-01Bibliographically approved
In thesis
1. Vertical Axis Wind Turbines: Electrical System and Experimental Results
Open this publication in new window or tab >>Vertical Axis Wind Turbines: Electrical System and Experimental Results
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The wind power research at the division of Electricity at Uppsala University is aimed towards increased understanding of vertical axis wind turbines. The considered type of wind turbine is an H-rotor with a directly driven synchronous generator operating at variable speed. The experimental work presented in this thesis comprises investigation of three vertical axis wind turbines of different design and size. The electrical, control and measurement systems for the first 12 kW wind turbine have been designed and implemented. The second was a 10 kW wind turbine adapted to a telecom application. Both the 12 kW and the 10 kW were operated against dump loads. The third turbine was a 200 kW grid-connected wind turbine, where control and measurement systems have been implemented.

Experimental results have shown that an all-electric control, substituting mechanical systems such as blade-pitch, is possible for this type of turbine. By controlling the rectified generator voltage, the rotational speed of the turbine is also controlled. An electrical start-up system has been built and verified. The power coefficient has been measured and the stall behaviour of this type of turbine has been examined. An optimum tip speed ratio control has been implemented and tested, with promising results. Use of the turbine to estimate the wind speed has been demonstrated. This has been used to get a faster regulation of the turbine compared to if an anemometer had been used.  

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2012. 77 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 981
Keyword
VAWT, H-rotor, start-up, all-electric control, Power Coefficient, stall, tip speed ratio, Renewable energy, Measurement systems, PM-generator
National Category
Energy Systems Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-182438 (URN)978-91-554-8496-5 (ISBN)
Public defence
2012-11-30, Room 2001, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:00 (English)
Opponent
Supervisors
Available from: 2012-11-07 Created: 2012-10-10 Last updated: 2013-01-23Bibliographically approved

Open Access in DiVA

fulltext(871 kB)0 downloads
File information
File name FULLTEXT01.pdfFile size 871 kBChecksum SHA-512
e42d485344b145f89812ea22db0275790dd76f478514772d5653b1f6fbb03c3371f5243ad649585eb35f7e2e9fc9793d0e98c60bfa47818aca1814c49a6a4b54
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Eriksson, SandraKjellin, JonBernhoff, Hans
By organisation
Electricity
Energy SystemsOther Electrical Engineering, Electronic Engineering, Information Engineering

Search outside of DiVA

GoogleGoogle Scholar
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

Altmetric score

Total: 333 hits
ReferencesLink to record
Permanent link

Direct link