Abstract
As the wind turbine size has been increasing and their mechanical components are built lighter, the reduction of the structural loads becomes a very important task of wind turbine control in addition to maximum wind power capture. In this paper, we present a separate set of collective and individual pitch control algorithms. Both pitch control algorithms use the LQR control technique with integral action (LQRI), and utilize Kalman filters to estimate system states and wind speed. Compared to previous works in this area, our pitch control algorithms can control rotor speed and blade bending moments at the same time to improve the trade-off between rotor speed regulation and load reduction, while both collective and individual pitch controls can be designed separately. Simulation results show that the proposed collective and individual pitch controllers achieve very good rotor speed regulation and significant reduction of blade bending moments.
Highlights
The main objective of wind turbine control is to make wind power production economically more efficient
Our collective pitch controller can control the rotor speed and collective, i.e., the steady-state value of, blade bending moments together to improve the trade-off between rotor speed regulation and load reduction, while the individual pitch controller reduces the fluctuating loads on the blades
We presented separate sets of collective and individual pitch control algorithms for rotor speed regulation and blade load reduction for a wind turbine
Summary
The main objective of wind turbine control is to make wind power production economically more efficient. In the above rated wind speed region, the blade pitch control is used primarily to regulate the rotor speed in order to regulate the aerodynamic power within its design limit [1]. A modern multi-input, multi-output (MIMO) control framework can be used to explicitly take into account the conflicted control objectives which are regulating rotor speed while reducing blade loads, and the so-called centralized pitch control can be designed where the collective and individual pitch commands are generated from the same controller [2,3,4]. Our collective pitch controller can control the rotor speed and collective, i.e., the steady-state value of, blade bending moments together to improve the trade-off between rotor speed regulation and load reduction, while the individual pitch controller reduces the fluctuating loads on the blades.
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