Table of Contents
Journal of Wind Energy
Volume 2013, Article ID 342061, 4 pages
Research Article

Electric Control Substituting Pitch Control for Large Wind Turbines

Division of Electricity, Swedish Centre for Renewable Electric Energy Conversion, Uppsala University, Box 534, 751 21 Uppsala, Sweden

Received 8 May 2013; Revised 15 August 2013; Accepted 20 August 2013

Academic Editor: Ujjwal K. Saha

Copyright © 2013 Jon Kjellin et al. 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.


A completely electrical control of a variable speed wind turbine is experimentally verified. A vertical axis wind turbine with a direct driven generator and an electrical system with diode rectification and full inverter connected to the electric grid is presented. This is the first paper that presents this novel 200 kW wind power plant erected at the west coast of Sweden. The turbine has fixed pitch and is only controlled electrically accommodated by passive stall of the blades. By electrically controlling the generator rotational speed with the inverter, passive stall regulation is enabled. The first results on experimental verification of stall regulation in gusty wind speeds are presented. The experiments show that the control system can keep the turbine rotational speed constant even at very gusty winds. It is concluded that electrical control accommodated by passive stall is sufficient as control of the wind turbine even at high wind speeds and can substitute mechanical control such as blade pitch.