Deliverable D2.2: Methodology for active load control
The objective of this deliverable was to analyze control mechanisms for the reduction of loads caused by a wind turbine being a part of a farm. These loads are mainly due to partial wake overlap, which forces blades to get in and out of one or more upwind turbine wakes, with the corresponding increase in fatigue
CL-Windcon contemplates both the reduction of said cyclic loads via individual pitch control and their avoidance via wake steering. Individual pitch control requires, however, a considerably increased pitch actuator activity and something similar occurred with wake steering and the yaw system. This is why is desirable to be able to activate (or trigger) a load-reducing control features only when partial wake overlaps actually happen. In this way, the deliverable presents estimators for partial wake overlap detection that can be used for that triggering strategy, as well as a novel closed-loop wake steering methodology and a triggerable individual pitch control implemented by OpenDiscon.
Another important point of the deliverable is the presentation of a technique for the management of sensor failure, which may have applications in wind farm control, where sensor redundancy may not only happen by design, but also by collaboration between turbines.
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