Renewable Energy 32 (2007) 2334–2349 Design of a wind turbine pitch angle controller for power system stabilisation Clemens Jauch a, , Syed M. Islam b , Poul Sørensen a , Birgitte Bak Jensen c a Risø National Laboratory, Wind Energy Department, P.O. Box 49, DK-4000 Roskilde, Denmark b Department of Electrical and Computer Engineering, Curtin University of Technology, GPO Box U1987, Pert WA 6845, Australia c Institute of Energy Technology, Aalborg University, Pontoppidanstræde 101, DK-9220 Aalborg East, Denma Received 1 April 2006; accepted 11 December 2006 Available online 23 March 2007 Abstract The design of a PID pitch angle controller for a fixed speed active-stall wind turbine, using the locus method is described in this paper. The purpose of this controller is to enable an active-sta turbine to perform power system stabilisation. For the purpose of controller design, the transfer function of the wind turbine is derived from the wind turbine’s step response. The performance this controller is tested by simulation, where the wind turbine model with its pitch angle contro connected to a power system model. The power system model employed here is a realistic mod the North European power system. A short circuitfault on a busbar close to the wind turbine generator is simulated, and the dynamic responses of the system with and without the power s stabilisation of the wind turbines are presented. Simulations show that in most operating points pitch controller can effectively contribute to power system stabilisation. r 2007 Elsevier Ltd. All rights reserved. Keywords: PID controller; Pitch controller; Power system oscillations; Wind turbine 1. Introduction In many countries of the world wind power expands and covers a steadily increasing part of these countries’ power demand. Growing wind power has impacts on the power systems into which the wind turbinesfeed theirpower.As wind powerpenetration ARTICLE IN PRESS www.elsevier.com/locate/renene 0960-1481/$ - see front matter r 2007 Elsevier Ltd. All rights reserved. doi:10.1016/j.renene.2006.12.009 Corresponding author. Tel.: +45 46 77 50 76; fax: +45 46 77 50 83. E-mail address: clja@gmx-topmail.de (C. Jauch).