Hello every one,
Recelently,I have been using the FAST v8, to do yaw control in Test18.fst.
FAST Certification Test #18: NREL 5.0 MW Baseline Wind Turbine (Onshore)
In servodyn,the corresponding code is set as
--------------------- NACELLE-YAW CONTROL -------------------------------------
4 YCMode - Yaw control mode {0: none, 3: user-defined from routine UserYawCont, 4: user-defined from Simulink/Labview, 5: user-defined from Bladed-style DLL} (switch)
0 TYCOn - Time to enable active yaw control (s) [unused when YCMode=0]
0 YawNeut - Neutral yaw position--yaw spring force is zero at this yaw (degrees)
9.02832E+09 YawSpr - Nacelle-yaw spring constant (N-m/rad)
1.916E+07 YawDamp - Nacelle-yaw damping constant (N-m/(rad/s))
9999.9 TYawManS - Time to start override yaw maneuver and end standard yaw control (s)
0.5 YawManRat - Yaw maneuver rate (in absolute value) (deg/s)
0 NacYawF - Final yaw angle for override yaw maneuvers (degrees)
in ElastoDyn
True YawDOF - Yaw DOF (flag)
0 NacYaw - Initial or fixed nacelle-yaw angle (degrees)
The pitch and generator and torque control are
5 PCMode - Pitch control mode {0: none, 3: user-defined from routine PitchCntrl, 4: user-defined from Simulink/Labview, 5: user-defined from Bladed-style DLL} (switch)
5 VSContrl - Variable-speed control mode {0: none, 1: simple VS, 3: user-defined from routine UserVSCont, 4: user-defined from Simulink/Labview, 5: user-defined from Bladed-style DLL} (switch)
The input wind file is wind type 2 uniform shown as below
Here are some of my questions:
(1) yaw rate form simulink can not be use;
(2)nacelle position follow the wind direction, the power decrease compared with the situation when the nacelle position is constant 0.
(3)wind wane is the angle between the nacelle and the wind direction, I am not quite understand the direction Coordinate system relationship in FAST.
Here are some simulation resuls
(1) when the yaw rate is set to be 0 , the nacelle still follow the wind direction
(2)when the nacelle position is set to be 0 and follow the wind direction the power comparision is as below:red line is the nacelle position is set to be 0, and the purple line is the line when nacelle position follow the wind direction. The power instead of increading ,but decrease
however The generator speed is the same line
I don’t know if someing was wrong