Abstract
How can fatigue-damage for control of wind turbines be represented? Fatigue-damage is indeed a crucial factor in structures such as wind turbines that are exposed to turbulent and rapidly changing wind flow conditions. This is relevant both in their design stage and during the control of their operation. Accordingly, the most recognized methods of fatigue-damage estimation are discussed in this thesis.
In wind energy conversion systems there is an intrinsic trade-off between power generation maximization and mechanical load minimization. Due to this compromise of competing objectives, the inclusion of fatigue-damage within feedback control loops is of special interest.
Four strategies in total are proposed in this work: three for the wind turbine level and one for the wind farm level. On one hand, the three strategies in the turbine level are based on hysteresis operators and strive to reduce the damage in the drive-train. On the other hand, the wind farm level strategy addresses its mixed-objective operation, allowing the wind farm to balance its power production and infrastructure wear, depending on what is more important.
This thesis adds findings to the current insight of fatigue-damage estimation in wind turbine components, to the mixed objective operation of wind energy conversion systems, and to the synthesis of control strategies that include hysteresis operators.
In wind energy conversion systems there is an intrinsic trade-off between power generation maximization and mechanical load minimization. Due to this compromise of competing objectives, the inclusion of fatigue-damage within feedback control loops is of special interest.
Four strategies in total are proposed in this work: three for the wind turbine level and one for the wind farm level. On one hand, the three strategies in the turbine level are based on hysteresis operators and strive to reduce the damage in the drive-train. On the other hand, the wind farm level strategy addresses its mixed-objective operation, allowing the wind farm to balance its power production and infrastructure wear, depending on what is more important.
This thesis adds findings to the current insight of fatigue-damage estimation in wind turbine components, to the mixed objective operation of wind energy conversion systems, and to the synthesis of control strategies that include hysteresis operators.
| Original language | English |
|---|---|
| Publisher | |
| Electronic ISBNs | 978-87-7112-398-2 |
| DOIs | |
| Publication status | Published - 2015 |