List of Symbols - Wind Energy Systems for Electric Power Generation - page 172

Annex A - List of Symbols

1. Turbine side
A

swept area, m 2

c p power coefficient

c T torque coefficient

D rotor diameter, m

F force, N

rotational speed, s − 1

n

v wind velocity, m/s

λ tip speed ratio

α blade angle

β pitch angle

specific air mass, kg / m 3

ρ

2. Generator and grid side

C capacitance

cos ϕ active factor

f frequency, Hz

I line current, A

L inductance

rotational speed, s − 1 n

P power, loss, W

P 0 input power at no-load, W

P 1 input power, excluding excitation, W

P 2 output power, W

P e excitation circuit losses, W

P f excitation (field) winding losses, W

P fe iron losses, W

P fw friction and windage losses, W

P C constant losses, W

P L load losses, W