Iterative tuning of feedforward IPC for two-bladed wind turbines

The Science of Making Torque from Wind

Mulders, S.P.^1,2 ; Van Solingen, E.^1,2 ; Van Wingerden, J.W.^1,2 ; Beerens, J.^1,2

Delft Center for Systems and Control, Faculty of Mechanical Engineering, Delft University of Technology, Mekelweg 2, CD Delft

2628, Netherlands^1

2-B Energy BV, Welbergweg 54, PE Hengelo

7556, Netherlands^2

关键词: Co-ordinate transformation;    Feed-forward controllers;    Feedforward strategy;    Individual pitch control;    Load alleviation;    Off-shore wind energy;    Self-optimizing;    Turbulent wind;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/5/052027/pdf
DOI  :  10.1088/1742-6596/753/5/052027

来源: IOP

【 摘 要 】

At present, the cost of offshore wind energy does not meet the level of onshore wind and fossil-based energy sources. One way to extend the turbine lifetime, and thus reduce cost, is by reduction of the fatigue loads of blades and other turbine parts using Individual Pitch Control (IPC). This type of control, which is generally implemented by feedback control using the MultiBlade Coordinate transformation on blade load measurement signals, is capable of mitigating the most dominant periodic loads. The main goal of this article is to develop a self-optimizing feedforward IPC strategy for a two-bladed wind turbine to reduce actuator duty cycle and reduce the dependency on blade load measurement signals. The approach uses blade load measurement data only initially for tuning of the feedforward controller, which is scheduled on the rotor azimuth angle and wind speed. The feedforward strategy will be compared to the feedback implementation in terms of load alleviation capabilities and actuator duty cycle. Results show that the implementation is capable of learning the optimal feedforward IPC controller in constant and turbulent wind conditions, to alleviate the pitch actuator duty cycle, and to considerably reduce harmonic fatigue loads without the need for blade load measurement signals after tuning.