Dear Jason
Thank you for the reply. how can I set pitch rate limit from -8 to 8 deg/s and pitch angle range from 0 to 90 degree? I am using open fast. thanks in advance .
Best regards
Dear @Suresh.Nakkala,
The pitch rates and final angles of the override pitch maneuvers are inputs set directly in ServoDyn.
In the operational controller, pitch angle and pitch-rate limits would be set within the user-specified controller (not directly within OpenFAST).
Best regards,
Dear Jason
thank you. I am getting confused to know about type of fault. I think I did simulation for sensor fault (constant magnitude after fault occurrence at 200 sec).is this sensor fault right? I am attaching the fault I created.
can I use my own separate second order pitch system to the NREL 5MW (open fast) instead of creating fault in the open fast input files? thanks in advance.
Best regards
Dear @Suresh.Nakkala,
Different wind turbines can experience different faults. Having the pitch angle get stuck at a certain angle is possible, as is a sudden ramp of the pitch angle to run (0deg) or feather (90deg). The actual faults possible will depend on the turbine / controller. For a reference wind turbine, such as the NREL 5-MW baseline wind turbine or IEA Wind 15-MW reference wind turbine, you should make your own assumptions for your own purposes.
I’m not sure I understand your second question.
Best regards,
Dear Jason
with one blade stuck( actuator fault) at 4 degree i.e BlPitchF(1)==4 condition on blade-1 , the generator speed is effected a little as in the results of generator speed I sent above. I tried BlPitchF(1)==0 on blade-1. but the generator speed is still not much effected for that fault .but blade root bending moments on the blades are much effected for the two conditions. How can I make more fault effect on generator speed with one pitch stuck at 0 i.e BlPitchF(1)==0.is there any other way to create blade pitch angle stuck fault on one blade to make generator speed response more effected? thanks in advance.
Best regards
N suresh
Dear @Suresh.Nakkala,
I would guess the influence of the “stuck” blade would depend on the wind speed. At high speeds, I could foresee a blade being “stuck” to still maintain rated power and speed because enough power could be extracted by the two blades functioning normally.
That said, if a blade gets “stuck” due a fault, I would expect the protection system of the wind turbine to identify that fault and shut down the wind turbine. So, simulating a wind turbine operating through the fault does not seem correct to me.
Best regards,