Elimination of Pitch Signal Fluctuations Caused by Unbalanced Aerodynamic System in 100 kW Wind Turbine

Nowadays wind energy introduces itself as one of the most important sources for electricity. Wind turbines are combined of different and complex mechanical and electrical components. In wind turbines any unbalanced parts will cause unwanted fluctuations which can be an intolerable problem. These fluctuations will be transferred to other parts of the turbine and will be observed on the different signals specially the pitch signal. Fluctuations may cause fatigue and unwanted loading in mechanical components and actuators. In this paper after explaining the structure and components of a typical wind turbine with permanent magnet synchronous generator, an idea to overcome the pitch signal fluctuations is represented. This method is applied to the gain scheduled PI pitch controller of an experimental simulator for 100 kW wind turbine.