Modelling and Control of Large Horizontal Axis Wind Power Plants

摘要

In order to make wind power competitive in a large utility grid it is important that the wind power plants are cheap and reliable. It is a nontrivial problem to choose the best design. The objective of this thesis is to give a global picture of the control problem of large horizontal axis wind power plants. The system dynamics and the wind characteristics are discussed and explained. An account of the fundamental properties of horizontal axis wind power plants are given. A modular simulation model is presented. Measured data are analysed and models are identified which show good agreement with models derived from first principles. After the analysis of the system dynamics, control is considered. The control objectives are discussed. The possibilities of compensating for wind speed variations are investigated. Basic factors such as control authority and measurements as well as interaction between process design and control design are discussed. A design procedure for pitch angle control is proposed. It is based on the LOG framework and considers wind properties and measuremnt noise explicitly. (ERA citation 11:005176)