Abstract
This paper addresses the design of a novel model-based control method for modern multi-mega-watt wind turbines using output regulation control scheme. The objective is to alleviate the extreme and fatigue loads on the moving components of the turbine structure (e.g., turbine tower, drivetrain, blades) whilst maximum energy is harvested from the approaching wind. The preview wind field information is collected, analyzed and measured over a given distance in front of the turbine using a light detection and ranging (LIDAR) system. The line-of-sight LIDAR wind measurements are then augmented in the Exact Output Regulation (EOR) control architecture together with the system state feedback information to construct the feedforward controller for the wind turbine. Simulations have been performed to evaluate the design of the proposed controller using a detailed aeroelastic model of the turbine in FAST and a set of turbulent wind fields over the full-load operation region. The results are then compared against the outcomes from the classic baseline controller. Results show promising lifetime fatigue load reduction up to 70% on the turbine tower without negative impact on the overall energy production.
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