slide1 n.
Download
Skip this Video
Download Presentation
Alleviation of Extreme Blade Load by Individual Blade Control during Normal Wind Turbine Operation

Loading in 2 Seconds...

play fullscreen
1 / 21

Alleviation of Extreme Blade Load by Individual Blade Control during Normal Wind Turbine Operation - PowerPoint PPT Presentation


  • 212 Views
  • Uploaded on

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Alleviation of Extreme Blade Load by Individual Blade Control during Normal Wind Turbine Operation' - slone


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

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

slide2

Active Blade Load Reduction

  • Spectra peaks inMx,My Bending Moment

EWEA 2012

slide3

Active Blade Load Reduction

  • Load Reduction
  • Fatigue Load
  • Extreme Load

Control Task

Power Regulation

Speed Regulation

EWEA 2012

slide4

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

slide5

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

slide6

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

slide7

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

slide8

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

slide9

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
slide10

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
slide11

Mx Control

  • Pitch angles
  • Power spectra density

17/04/2012

EWEA 2012

slide12

Mx Control

  • Pitch angles
  • Power spectra density

17/04/2012

EWEA 2012

slide13

Mx Control

  • Time trace
  • Loads in (My,Mx) plane

17/04/2012

EWEA 2012

slide14

My Control

  • Power spectra density
  • Pitch angles

17/04/2012

EWEA 2012

slide15

My Control

  • Time trace
  • Loads in (My,Mx) plane

17/04/2012

EWEA 2012

slide16

Mx My Comparison

Blade Mx control

Blade My control

17/04/2012

EWEA 2012

slide17

Mx My Comparison

Blade Mx control

Blade My control

17/04/2012

EWEA 2012

slide18

Mx My Comparison

Blade Mx control

Blade My control

17/04/2012

EWEA 2012

slide19

Mxy Control

17/04/2012

EWEA 2012

slide20

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

slide21

Any Questions?

Thank You.

EWEA 2012

ad