Gain Scheduled H Control of Wind Turbines for the Entire Operating Range - Wind Turbine Control and Monitoring - page 68

Nomenclature

b Pitch angle
b r Pitch angle command
b o Optimum pitch angle
H Torsion angle
k Tip-speed-ratio
k o Optimum tip-speed-ratio
q Air density
s Time constant of the pitch actuator
X g Generator speed
X N Rated rotational speed
X r Rotor speed
B r Intrinsic rotor damping
B s Drive-train damping
C P Power coefficient
C P max Maximum power coefficient
J g Generator inertia
J t Rotor inertia
K s Drive-train stiffness
k b Torque-pitch gain
k gs Gain-scheduling gain
k V Torque-wind speed gain
N g Gear-box ratio
P r Rotor power
P N Rated power
R Rotor radius
T g Generator torque
T N Rated torque
T r Aerodynamic torque
T sh Shaft torque
V Wind speed
V N Rated wind speed
k G ð s Þk 1 Denotes the 1 -norm of the stable system with transfer function G ð s Þ
x Denotes steady-state value of x

x Denotes variation with respect to the steady-state value of x

x Denotes dx = dt