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![Page 1: Accelerating Wind Energy 1 A physical approach to monitor tower base fatigue loads using standard signals Thesis presentation Freark Koopman Committee:](https://reader038.fdocuments.us/reader038/viewer/2022110116/5517784c55034645368b4ee4/html5/thumbnails/1.jpg)
Accelerating Wind Energy1
Accelerating Wind EnergyA physical approach to monitor tower base fatigue loads using standard signals
Thesis presentationFreark Koopman
Committee:Gerard van Bussel
Dick VeldkampGijs van der Veen
![Page 2: Accelerating Wind Energy 1 A physical approach to monitor tower base fatigue loads using standard signals Thesis presentation Freark Koopman Committee:](https://reader038.fdocuments.us/reader038/viewer/2022110116/5517784c55034645368b4ee4/html5/thumbnails/2.jpg)
Agenda
1. Wind Energy
2. Wind Turbines
3. Load monitoring
4. Physical approach
5. Results
6. Conclusions
Accelerating Wind Energy2
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Wind Energy
Accelerating Wind Energy3
1
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Wind Turbines
Accelerating Wind Energy4
2
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Load monitoring
Accelerating Wind Energy5
23
• Gain insight in the load history
• Prevent breakdown
• Check your design
• Reduce cost of energy
• Find abnormal turbine behaviour
3
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Load monitoring
Accelerating Wind Energy6
• Measure (Direct)
• Expensive
• Time consuming
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Load monitoring
Accelerating Wind Energy7
• Estimate (Indirect)
• Already available signals
• No extra sensorsL
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Load monitoring
Accelerating Wind Energy8
• Standard signals
• Wind speed
• Pitch angle
• Power output
• Rotor speed
• Nacelle acceleration
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Load monitoring
Accelerating Wind Energy9
• Neural network
• Good results
• No insight in
underlying process
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Physical approach
Accelerating Wind Energy10
L
4
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Physical approach
Accelerating Wind Energy11
M(x,t)kev(x)EIv(L,t)
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Physical approach
Accelerating Wind Energy12
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Physical approach
Accelerating Wind Energy13
Time
Acc
eler
atio
n
v(L,t)a(L,t) ∬dtdt
Dis
plac
emen
t
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Physical approach
Accelerating Wind Energy14
v(L,t)a(L,t) ∬dtdt
Time
Dis
plac
emen
t
~150 m
• Fourier
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Physical approach
Accelerating Wind Energy15
• Fourier
Time
Am
plitu
de
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Physical approach
Accelerating Wind Energy16
• Fourier
Frequency
Am
plitu
de
v(L,t)a(L,t) ∬dtdt v(L,t)a(L,t) ∬dtdtHigh-PassFilter(f>50mHz)
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v(L,t)a(L,t) ∬dtdtHigh-PassFilter(f>50mHz)
Physical approach
Accelerating Wind Energy17
Time
Acc
eler
atio
nD
ispl
acem
ent
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Physical approach
Accelerating Wind Energy18
vFA(L,t)aFA(L,t) ∬dtdtHigh-Pass Filter (f>50mHz)
P(t) ThrustΩ (t) θ (t)
1/KLow-Pass Filter (f<50mHz)+
U∞ (t)
Gαev-
vFA(L,t)aFA(L,t) ∬dtdtHigh-Pass Filter (f>50mHz)
P(t) ThrustΩ (t) θ (t)
1/KLow-Pass Filter (f<50mHz)+
U∞ (t)
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Results
Accelerating Wind Energy19
5
vFA(L,t)aFA(L,t) ∬dtdtHigh-Pass Filter (f>50mHz)
P(t) ThrustΩ (t) θ (t)
1/KLow-Pass Filter (f<50mHz)+
U∞ (t)
Gαev
-
VSvFA(L,t)aFA(L,t) ∬dtdtHigh-Pass Filter (f>50mHz)
P(t) ThrustΩ (t) θ (t)
1/KLow-Pass Filter (f<50mHz)+
U∞ (t)
Gαev-
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Results
Accelerating Wind Energy20
Time
Ben
ding
Mom
ent
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Results
Accelerating Wind Energy21
Time
Ben
ding
Mom
ent
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Results
Accelerating Wind Energy22
= 1
vFA(L,t)aFA(L,t) ∬dtdtHigh-Pass Filter (f>50mHz)
P(t) ThrustΩ (t) θ (t)
1/KLow-Pass Filter (f<50mHz)+
U∞ (t)
Gαev
-
![Page 23: Accelerating Wind Energy 1 A physical approach to monitor tower base fatigue loads using standard signals Thesis presentation Freark Koopman Committee:](https://reader038.fdocuments.us/reader038/viewer/2022110116/5517784c55034645368b4ee4/html5/thumbnails/23.jpg)
Results
Accelerating Wind Energy23
0 5 10 15 20 250.6
0.8
1
1.2
1.4
1.6
Wind Speed [m/s]
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Conclusions
Accelerating Wind Energy24
• From nacelle acceleration to tower bending moment
• High-pass filter to prevent drift
• Thrust estimator for low frequency compensation
• Gravity correction necessary
• The equivalent loads are underestimated by 8% with a standard deviation
of 6%
6
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Accelerating Wind EnergyA Physical approach to monitor tower base fatigue loads using standard signals
Thank you for your attention
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Accelerating Wind EnergyA Physical approach to monitor tower base fatigue loads using standard signals