I am currently trying to validate simulations of a simple wind turbine model using FAST as a reference.
It would be of tremendous help if I could tell FAST to hold a specific generator torque while I play with different wind speeds, without any active control algorithms.
Is there a way to do that? I know it is possible to set blade pitch angles to a fixed value. Is there a similar option for the generator torque or do I need to create a specific controller for this purpose?
You can easily set a constant generator torque through the simple variable-speed control option (VSContrl = 1) via the following input settings (in the primary FAST input file of FAST v7 or the ServoDyn input file of FAST v8):
VSContrl = 1
VS_RtGnSp = 9999.9E-9
VS_RtTq = the desired constant generator torque in N-m
VS_Rgn2K = 9999.9E-9
VS_SlPc = 9999.9E-9
Please note, though, that if you have a constant generator torque and no other control (such as blade-pitch or nacelle-yaw), the rotor will accelerate or decelerate if the applied aerodynamic torque does not balance with the generator torque.
thank you for your quick reply!
That strategy had not occured to me.