Alleviation of Extreme Blade Load by Individual Blade Control during Normal Wind Turbine Operation
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Alleviation of Extreme Blade Load by Individual Blade Control during Normal Wind Turbine Operation. W. E. Leithead P , HAN YI F. University of Strathclyde Glasgow, UK. 17/04/2012. EWEA 2012. Active Blade Load Reduction. Spectra peaks in Mx,M y Bending Moment.

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Alleviation of Extreme Blade Load by Individual Blade Control during Normal Wind Turbine Operation

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Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Alleviation of Extreme Blade Load by Individual Blade Control during Normal Wind Turbine Operation

W. E. LeitheadP, HAN YIF

University of Strathclyde

Glasgow, UK

17/04/2012

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Active Blade Load Reduction

  • Spectra peaks inMx,My Bending Moment

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Active Blade Load Reduction

  • Load Reduction

  • Fatigue Load

  • Extreme Load

Control Task

Power Regulation

Speed Regulation

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Active Blade Load Reduction

  • Load Reduction

  • Fatigue Load

  • Extreme Load

Control Task

Power Regulation

  • Fatigue Load

Speed Regulation

  • Blade root out-of-plane bending

  • moment

  • Aggregation of loads over lifetime

  • Spectra peaks at 1P, 2Prad/s

  • Reduction on blades, rotor, hub,

  • yaw,…

  • Rain-flow counting, etc

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Active Blade Load Reduction

  • Load Reduction

  • Fatigue Load

  • Extreme Load

Control Task

Power Regulation

  • Extreme Load

Speed Regulation

  • Blade edgewise and flapwiseBMs

  • Spectral peaks at 1Prad/s, edge

  • mode

  • Single event over lifetime

  • Reductions on the blade stations

  • Partial projection onto various

  • directions on (My,Mx) plane

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Blade Pitch Control

  • Active blade load alleviation by pitch control

  • Each blade pitched individually

  • Options

    • cyclic pitch control

    • individual pitch control

    • individual blade control

Individual Blade Control

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

M1

b1

reference inputs

rotor speed

M2

bd

turbine

dynamics

b2

actuator+ control

actuator+ control

actuator+ control

wg

M3

central

controller

b3

Individual Blade Control

  • Each localised blade control systems operates in isolation

  • Design of central controller and localised controllers are

  • completely independent

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Extreme Blade Loads

  • L1: Combination of Mxand My

    • Dominant at low wind speeds near rated

    • Key component is blade edge mode

  • L2: Combination of Mx and My

    • Dominant at high wind speeds

    • Key component is 1P

  • L3: Projection of (My,Mx) onto negative My

  • direction in (My,Mx) plane

  • L4: Projection of (My,Mx)onto positive Mx

  • direction in (My,Mx) plane

17/04/2012

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Controller Design

Control options

  • Mx control

    • Regulates blade edge spectral peak

    • Acts on measured Mx

  • My control

    • Regulates 1Pspectral peak

    • Acts on measured My

  • Mxy control

    • Regulates blade edge spectral peak at low wind speed

    • Regulates 1Pspectral peak at high wind speed

      • Acts on measured


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Performance Assessment

  • Simulation based on an example 3MW WT Bladed model

  • Full operational envelope including extreme

    wind conditions, IEC 61400-1

  • Extreme loads determined as the worst case

    from nine separate evaluation

  • Important blade sections: 06,08,10,12,14 and 18


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Mx Control

  • Pitch angles

  • Power spectra density

17/04/2012

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Mx Control

  • Pitch angles

  • Power spectra density

17/04/2012

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Mx Control

  • Time trace

  • Loads in (My,Mx) plane

17/04/2012

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

My Control

  • Power spectra density

  • Pitch angles

17/04/2012

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

My Control

  • Time trace

  • Loads in (My,Mx) plane

17/04/2012

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Mx My Comparison

Blade Mx control

Blade My control

17/04/2012

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Mx My Comparison

Blade Mx control

Blade My control

17/04/2012

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Mx My Comparison

Blade Mx control

Blade My control

17/04/2012

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Mxy Control

17/04/2012

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Conclusion

  • Active control of blade loads considered

  • IBC applied to alleviate extreme blade loads

  • Flexibility of IBC over choice of measured bending

  • moment exploited

  • A reduction of 20% to 30% in the most important

  • extreme loads is achieved for an example 3MW WT

  • Further refinement possible

EWEA 2012


Alleviation of extreme blade load by individual blade control during normal wind turbine operation

Any Questions?

Thank You.

EWEA 2012


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