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The pitch regulated variable-speed wind turbines operate at rated power output point by adjusting pitch angle as the wind speed is over rated value. In this case the pitch angle controller may play important roles on keeping normal operation and minimizing fatigue load for wind turbine. This paper proposes a new optimal control strategy with multiple objectives where maximum power and minimizing load...
It is the main objective for conventional variable-speed constant frequency wind energy conversion system (WECS) below the rated power to realize maximum power point tracking (MPPT). This paper presents a double objectives control scheme for WECS. Based on the frequency separation principle, the wind speed is divided into two components, a slowly varying component, named seasonal, and a rapidly varying...
Pitch angle control is the most common means for adjusting the aerodynamic torque of the wind turbine when wind speed is above rated speed and various controlling variables may be chosen, such as wind speed, generator speed and generator power. As conventional pitch control usually use PI controller, the mathematical model of the system should be known well. A fuzzy logic pitch angle controller is...
The wind turbine codes predict wind turbine loads and response in high accuracy and can be used in controller design with the development of the computer technologies. In this paper open source FAST code developed by NREL is studied. The wind turbine controller is designed in the Matlab/Simulink environment and the FAST code is modeled as an S-function. The simulation of the control algorithms with...
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