Publishers version - DTU Orbit

PP rated
WS Lidarms
1.0
0.8
0.6
0.4
0.2
0.0
15
10
5
"Lidar" "Sodar"
y0.1521.042 x
R 2 0.990
y1.019 x
R 2 0.989
0
a
0 5 10 15
WS Cupms
Cup
Lidar
c
0.2 0.4 0.6 0.8 1.0 1.2
U hubU rated
PP rated
WS Sodarms
1.0
0.8
0.6
0.4
0.2
0.0
15
10
5
y0.1921.066 x
R 2 0.909
y1.095 x
R 2 0.908
0
b
0 5 10 15
WS Cupms
Cup
Sodar
d
0.2 0.4 0.6 0.8 1.0 1.2
U hubU rated
Figure 98: (a) Linear regression of 10-min mean wind speed measured by a lidar and a cup
anemometer; (b) Linear regression of 10-min mean wind speed measured by a sodar and the
same cup anemometer as in (a) for the same 10-min periods; (c) power curve obtained with
wind speed measurement at hub height with a cup and a lidar; (d) power curve obtained with
wind speed measurement at hub height with a sodar and the same cup anemometer as in (c)
for the same 10-min periods
dFT local tangential force
KEhub kinetic energy flux of a constant wind profile
KEprofile kinetic energy flux of the wind profile
P electrical power output of the turbine
r radial position
rΩ blade speed
R coefficient of determination
R rotor radius
RSS residual sum of squares
u wind speed
ueq equivalent wind speed
ufit fit wind speed function to the power profile
uhub hub height wind speed
ui wind speed at height zi
w relative wind speed
z height above the ground
zhub hub height
zi lidar height
α shear exponent of the power law
αfit shear exponent fit
θ azimuth angle
ρ air density
φ angle of attack
DTU Wind Energy-E-Report-0029(EN) 155