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Related Concept Videos

Wind Turbine Machine Models01:24

Wind Turbine Machine Models

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In the growing field of wind energy, incorporating wind turbine models into transient stability analysis is essential. Induction and synchronous machines are the primary models used, with induction machines being prevalent due to their simplicity and reliability.
Induction machines interact through the rotating magnetic field generated by the stator and the rotor. The key parameter is slip, which is the difference between synchronous speed and rotor speed relative to synchronous speed. Slip is...
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Turbine-governor control is crucial for maintaining power system stability by balancing turbine mechanical power output with electrical load demand. This mechanism ensures that generator frequency and rotor speed are within acceptable limits during load variations. Turbine-generator units store kinetic energy due to their rotating masses; this energy is released to meet the load requirement when the load increases. The electrical torque of turbines rises to meet the demand, whereas the...
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The Swing Equation01:21

The Swing Equation

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The Swing Equation is a fundamental tool in power system dynamics, especially for analyzing the behavior of generating units like three-phase synchronous generators. This equation emerges from applying Newton's second law to the rotor of a generator, encompassing factors such as inertia, angular acceleration, and the interplay between mechanical and electrical torques.
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Sleep-Wake Cycles01:24

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Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
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Related Experiment Video

Updated: Nov 11, 2025

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
08:36

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

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Sleep actigraphy time-synchronized with wind turbine output.

David S Michaud1, Stephen E Keith1, Mireille Guay2

  • 1Health Canada, Environmental and Radiation Health Sciences Directorate, Consumer & Clinical Radiation Protection Bureau, Ottawa, ON, Canada.

Sleep
|March 26, 2021
PubMed
Summary

Wind turbine sound levels below 45 dBA did not impact sleep quality. However, short-term sound variations, not average levels, were linked to minor increases in awakenings and movement during sleep.

Keywords:
Actiwatch2Community Noise and Health StudySCADAawakeningsmotilitysleep actigraphywind turbine

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Area of Science:

  • Environmental Health
  • Sleep Science
  • Acoustics

Background:

  • Inconsistent evidence exists regarding wind turbine sound pressure level (SPL) and sleep disturbance.
  • Transient sleep changes may be more sensitive to short-term SPL fluctuations than long-term averages.

Purpose of the Study:

  • To investigate the association between wind turbine SPL variations and sleep actigraphy outcomes.
  • To determine if short-term SPL changes, rather than average levels, affect sleep quality.

Main Methods:

  • Analyzed 2,094 sleep actigraphy nights, synchronized with wind turbine operational data.
  • Calculated indoor wind turbine SPL, adjusting for rotor speed and window status.
  • Assessed SPL in 10-minute intervals and nightly averages, including SPL variability (∆SPL).

Main Results:

  • Nightly average and 10-minute interval wind turbine SPL were not statistically associated with actigraphy outcomes.
  • Variability in wind turbine SPL (∆SPL) showed a statistical relationship with increased awakenings and motility.
  • These effects were minimal, translating to less than 1 minute of additional awake/motility time for a 5 dBA increase.

Conclusions:

  • Wind turbine SPL below 45 dBA is not associated with consequential changes in actigraphy-measured sleep.
  • Sleep assessment may benefit from considering SPL variations throughout the sleep period, not just averages.
  • Short-term SPL fluctuations, rather than sustained levels, may be a more sensitive indicator of sleep disturbance.