Big Experience with Small Wind Turbines 235 SWT and 15 Years of Operational Results

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Big Experience with Small Wind Turbines235 SWT
and 15 Years of Operational Results
EWEC 2007- Milan, Italy, 9 May 2007, Technical
Track Small wind turbines, distributed
generation and autonomous systems
Paul Kühn
ISET Institut für Solare Energieversorgungstechni
k Kassel/ Hanau, Germany
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Evaluation Programme Wind Energy in Germany, WMEP

• ISET has been monitoring the development of wind
  energy use in Germany since 1989, in the
  framework of the 250 MW Wind programme.
• Operational results gathered by questionnaire
  (more than 1 500 WT) and measurements (200 sites)
  about
• effects by external conditions
• fluctuation of fed in wind power
• economy of wind energy
• energy yields
• reliability of WT
• This contribution
• Operational results of 235 SWT

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Big Experience - SWT models in the WMEP
Krogmann 15/50
Südwind N715
AEE Peters PG 10
40 m2 lt swept area lt 200 m2
swept area 40 m2
Wenuns Inventus 6
Lagerwey 15/75
LMW 2500
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Big Experience - Evaluations
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WMEP - Data Acquisition Maintenance and Repair
Reports
More than 62 000 reports concerning
maintenance and repairs 4 200 reports from SWT
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Reliability - Causes of Failure
Small wind turbines both size categories
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Reliability - Repairs
generator 5
rotor hub 8
mechanical brake 7
sensors 11
rotor blades 5
gear box 5
control unit 17
hydraulic system 5
yaw mechanism 5
drive train 3
supporting structure 3
electrical system 26
Small wind turbines 40 m2 lt swept area lt 200 m2
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Reliability - Repairs
generator 7
sensors 6
rotor hub 23
control unit 14
mechanical brake 11
electrical system 13
rotor blades 9
hydraulic system 2
gear box 5
drive train 3
supporting structure 5
yaw mechanism 3
Small wind turbines swept area 40 m2
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Reliability - Frequency of Failure Related
Downtime
Small wind turbines both size categories
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Reliability - Age Dependent Technical Availability
Large WT 97
Small wind turbines in the WMEP
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Conclusions Outlook
Main Barriers Costs and Reliability SWT _at_
ISET Further Development and Optimization Approa
ch Most Simple Turbine Design
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Thank you for your attention!
contact pkuehn_at_iset.uni-kassel.de www.iset.uni-k
assel.de http//reisi.iset.uni-kassel.de
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