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

W. E. LeitheadP, HAN YIF

University of Strathclyde

Glasgow, UK

17/04/2012

EWEA 2012


Active Blade Load Reduction Control during Normal Wind Turbine Operation

  • Spectra peaks inMx,My Bending Moment

EWEA 2012


Active Blade Load Reduction Control during Normal Wind Turbine Operation

  • Load Reduction

  • Fatigue Load

  • Extreme Load

Control Task

Power Regulation

Speed Regulation

EWEA 2012


Active Blade Load Reduction Control during Normal Wind Turbine Operation

  • 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


Active Blade Load Reduction Control during Normal Wind Turbine Operation

  • 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


Blade Pitch Control Control during Normal Wind Turbine Operation

  • 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


M Control during Normal Wind Turbine Operation1

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


Extreme Blade Loads Control during Normal Wind Turbine Operation

  • 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


Controller Design Control during Normal Wind Turbine Operation

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


Performance Assessment Control during Normal Wind Turbine Operation

  • 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


Mx Control during Normal Wind Turbine Operation Control

  • Pitch angles

  • Power spectra density

17/04/2012

EWEA 2012


Mx Control during Normal Wind Turbine Operation Control

  • Pitch angles

  • Power spectra density

17/04/2012

EWEA 2012


Mx Control during Normal Wind Turbine Operation Control

  • Time trace

  • Loads in (My,Mx) plane

17/04/2012

EWEA 2012


My Control Control during Normal Wind Turbine Operation

  • Power spectra density

  • Pitch angles

17/04/2012

EWEA 2012


My Control Control during Normal Wind Turbine Operation

  • Time trace

  • Loads in (My,Mx) plane

17/04/2012

EWEA 2012


Mx Control during Normal Wind Turbine Operation My Comparison

Blade Mx control

Blade My control

17/04/2012

EWEA 2012


Mx Control during Normal Wind Turbine Operation My Comparison

Blade Mx control

Blade My control

17/04/2012

EWEA 2012


Mx Control during Normal Wind Turbine Operation My Comparison

Blade Mx control

Blade My control

17/04/2012

EWEA 2012


Mxy Control during Normal Wind Turbine Operation Control

17/04/2012

EWEA 2012


Conclusion Control during Normal Wind Turbine Operation

  • 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


Any Questions? Control during Normal Wind Turbine Operation

Thank You.

EWEA 2012


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