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Energies 2015, 8(6), 5973-5996; doi:10.3390/en8065973

Evaluation of a Blade Force Measurement System for a Vertical Axis Wind Turbine Using Load Cells

Division of Electricity, Department of Engineering Sciences, Uppsala University, Box 534, 751-21 Uppsala, Sweden
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Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Received: 24 March 2015 / Revised: 4 June 2015 / Accepted: 5 June 2015 / Published: 18 June 2015
(This article belongs to the Collection Wind Turbines)
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Abstract

Unique blade force measurements on an open site straight-bladed vertical axis wind turbine have been performed. This paper presents a method for measuring the tangential and normal forces on a 12-kW vertical axis wind turbine prototype with a three-bladed H-rotor. Four single-axis load cells were installed in-between the hub and the support arms on one of the blades. The experimental setup, the measurement principle, together with the necessary control and measurement system are described. The maximum errors of the forces and accompanying weather data that can be obtained with the system are carefully estimated. Measured forces from the four load cells are presented, as well as the normal and tangential forces derived from them and a comparison with theoretical data. The measured torque and bending moment are also provided. The influence of the load cells on the turbine dynamics has also been evaluated. For the aerodynamic normal force, the system provides periodic data in agreement with simulations. Unexpected mechanical oscillations are present in the tangential force, introduced by the turbine dynamics. The measurement errors are of an acceptable size and often depend on the measured variable. Equations are presented for the calculation of measurement errors. View Full-Text
Keywords: vertical axis wind turbine; blade force; measurement; wind power; tangential force; normal force; H-rotor vertical axis wind turbine; blade force; measurement; wind power; tangential force; normal force; H-rotor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Rossander, M.; Dyachuk, E.; Apelfröjd, S.; Trolin, K.; Goude, A.; Bernhoff, H.; Eriksson, S. Evaluation of a Blade Force Measurement System for a Vertical Axis Wind Turbine Using Load Cells. Energies 2015, 8, 5973-5996.

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