slide1
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


  • 211 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


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