Structural Load Analysis of Floating Wind Turbines Under Blade Pitch System Faults - Wind Turbine Control and Monitoring - page 292

Nomenclature

b Blade pitch angle

b ref Reference blade pitch angle

C Damping coefficient

C P ; max Maximum power coefficient

e(t) Error signal

g Generator efficiency

h Hub height

I D Drive-train inertia

J Turbine inertia term about platform pitch axis

K Stiffness coefficient

K P Proportional gain

K I Integral gain

k Tip speed ratio

N Gearbox ratio

X g Generator speed

X g ; rated Rated generator speed

X r Rotor speed

X r ; rated Rated rotor speed

x n Natural frequency

P rated Rated output power of the generator

Sensitivity of the rotor aerodynamic power to the scheduling parameter

dP
dh

R Rotor radius

q Air density

T Aerodynamic rotor thrust

T 0 Aerodynamic thrust over the rotor at the linearization point

T g Generator torque

t d Time delay

h Scheduling parameter

V Average wind speed over the rotor disk

w(t) Noise

x Tower top (hub) velocity

n Platform pitch angle

n

Platform pitch angular velocity

n

Platform pitch angular acceleration

f Damping ratio