Abstract
This paper describes an experimental assessment of the impact of combined derating and wake steering by yawing on the power output of a cluster of three wind turbines. The test is conducted in a boundary layer wind tunnel, and the flow control strategies are applied to the sole upstream machine. The experiment reveals a relationship, so far never observed experimentally, between the amount of yaw-induced power losses and the implemented level of derating. Furthermore, combining derating and yawing can only be beneficial, in terms of improved power production at the cluster level, for modest derating values.
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