How to use wind turbine yaw controller 1. The yaw element This element emulates the yaw bearing. The yaw element must be an extension of, or part of the tower. The rotation prescribed by the yaw controller is applied as a relative rotation between the tower and the yaw element, and is applied in end 1 of the yaw element. 2. Add yaw element at the top of the tower Make two new super nodes, e.g. 0.1 m above the tower top. The lower one (yaw1) at the tower top, and the upper one (yaw2) 0.1 m above. Yaw1 must be slave to the tower top, yaw2 is free. Set shaft end 2 (sh_sn2) as slave to yaw2. Make a new line (yawline), between yaw1 and yaw2, and assign a line type and cross section (stiff) 3. Set controller parameters See RIFLEX user manual for explanation of the parameters. Some more guidance for selecting the parameters is given here: Time step: Most numerically stable to set same as integration time step Set point: Normally 0, unless yaw misalignment is desired Error threshold: Threshold for when to start correcting yaw misalignment. Note that this is not a specific yaw angle, but an integrated yaw error squared (i.e. small angle + long time or large angle + short time). For fast response, select a low value. Reference line: Tower, in most cases. The yaw line must be an extension of the reference line, with codirectional x-axis. Yaw line: Yaw line created in previous section. 4. Post processing There’s no yaw angle output from the controller. Store the nodal position of the hub (dynamic calculation parameters) Plot the shaft orientation using the atan2 function 5. Fixed wind turbine with EDC 6. New feature: Nacelle yaw control Nacelle yaw control for wind turbines. Yaw bearing emulated as prescribed relative rotation between the tower and the yaw element. Internal controller logics only. Controller logics as described by : Mulders, S. P., and J. W. van Wingerden. "Delft Research Controller: an open-source and community-driven wind turbine baseline controller." Journal of Physics: Conference Series. Vol. 1037. No. 3. IOP Publishing, 2018. Wind turbine controller modeling How to find the air gap of wind turbine blades