Reliability Assessment of Wind Farms

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Reliability Assessment of Wind Farms
Ph.D. Student Salman Kahrobaee
skahrobaee_at_huskers.unl.edu Undergraduate Student
Eric Harmon ericharmon13_at_gmail.com
Dr. Sohrab Asgarpoor
Department of Electrical Engineering
Failure Rate
Repair Duration
Significance of Wind Farm Reliability Study
Component Reliability
Success

• Effect of stochastic behaviour of wind source on
  electricity generation.
• Viability of many rotating and moving parts of
  WT to failure.
• Installation of the WT in high elevation and
  exposed to stochastic weather changes.
• Growth of wind energy penetration in the power
  generation system.
• Variety of wind turbine models and designs in the
  market.

Failure
Source http//docs.wind-watch.org/Wilkinson-slide
15.jpg
Source http//docs.wind-watch.org/Wilkinson-slide
16.jpg
Wind Turbine Reliability
Generator Models
Wind Turbine Subassemblies and Models

Wound Rotor Induction Generator
Doubly Fed Induction Generator
Squirrel Cage Induction Generator
Brushless Doubly Fed Induction Generator

Electrically Excited Synchronous Generator
Direct Drive Permanent Magnet Synchronous Generator
Permanent Magnet Synchronous Generator
Source Overview of different wind generator systems and their comparisons (Li, H.) Source Overview of different wind generator systems and their comparisons (Li, H.)
Induction Generator
Source www.alternative-energy-news.info
Wind Farm Reliability
Wind Farm
Grid
Load
Synchronous Generator
Wind Farm Markov Model
Wind Farm
Wind
Source http//windpowerfacts.net/wind-power-info/
Results and Conclusion
Wind Speed Changes
Load changes
Wind Farm Reliability Indices
Wind Farm Availability
Conclusions
Short Term

• Reliability and Availability of wind farms
  were assessed considering
• Wind turbine failures.
• Wind speed variations.
• Load changes.
• According to the results, wind farm should be
  connected to a grid or a storage system in order
  to supply the loads reliably.
• Based on the proposed model, wind farm owner
  can estimate the surplus/ required amount of
  energy in their short-term and long-term study
  and plan accordingly to maximize their profits.

Load Distribution
Wind Distribution
Long Term
Short-term
Long-term