Control design methods for floating wind turbines for optimal disturbance rejection

The Science of Making Torque from Wind

Lemmer, Frank^1 ; Schlipf, David^1 ; Cheng, Po Wen^1

University of Stuttgart (SWE), Allmandring 5B, Stuttgart

70569, Germany^1

关键词: Control design methods;    Controlled variables;    Conventional-PI controller;    Environmental conditions;    Floating wind turbines;    Frequency domains;    Multi input multi output systems;    Optimal controller;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/9/092006/pdf
DOI  :  10.1088/1742-6596/753/9/092006

来源: IOP

【 摘 要 】

An analysis of the floating wind turbine as a multi-input-multi-output system investigating the effect of the control inputs on the system outputs is shown. These effects are compared to the ones of the disturbances from wind and waves in order to give insights for the selection of the control layout. The frequencies with the largest impact on the outputs due to limited effect of the controlled variables are identified. Finally, an optimal controller is designed as a benchmark and compared to a conventional PI-controller using only the rotor speed as input. Here, the previously found system properties, especially the difficulties to damp responses to wave excitation, are confirmed and verified through a spectral analysis with realistic environmental conditions. This comparison also assesses the quality of the employed simplified linear simulation model compared to the nonlinear model and shows that such an efficient frequency-domain evaluation for control design is feasible.