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An increasing number of wind turbines implement individual blade pitch control (IPC) to reduce turbine dynamic loading, and thereby, to reduce the capital and operational costs associated with energy production. The aim of this paper is to demonstrate IPC on a wind turbine prototype, in a model-free data-driven manner and with reduced pitch activity. For this, subspace predictive repetitive control...
The design of a damped free-yaw system for a novel downwind two-bladed wind turbine is presented. The major advantage of a damped free-yaw system is the reduced load transfer from the blades to the support structure. The amount of damping provided by the yaw system and the bandwidth of the individual pitch controller used for yaw control significantly impact the loads on the wind turbine. In order...
In this paper, a fixed-structure Individual Pitch Control (IPC) design method for two-bladed wind turbines is presented. IPC is an active load reduction technique designed to lower wind turbine loads, which are caused by continuously varying wind conditions. Based on load measurements, the once-per-revolution (1P) loads and harmonics of this frequency (2P, 3P, etc.) can be reduced by rotating (pitching)...
An algorithm is presented that efficiently estimates the parameters of spatially interconnected descriptor systems. The descriptor system plays an important role in representing the equations of motion of many mechanical structures in state-space form. In this context, descriptor systems offer a clear advantage over normal state-space systems since physical interpretation is preserved. The parameters...
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