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Related Concept Videos

Wind Turbine Machine Models01:24

Wind Turbine Machine Models

108
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...
108
Turbine-Governor Control01:17

Turbine-Governor Control

172
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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Generator Voltage Control01:21

Generator Voltage Control

127
Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand,...
127
Control of Power Flow01:30

Control of Power Flow

253
There are several methods to control power flow in power systems:
253
Design Example: Calculating Safe Diameter for Wind-Exposed Disc01:17

Design Example: Calculating Safe Diameter for Wind-Exposed Disc

43
Assessing safety in wind-exposed installations is crucial to preventing potential failures. This example explores the calculation and design adjustments needed to mount a circular disc on a building facade, where wind forces are a primary concern. A 4-meter diameter disc was initially designed as an aesthetic feature facing winds at a velocity of 25 meters per second, with an air density of 1.25 kilograms per cubic meter. Given these conditions, the drag force on the disc was determined using...
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The Swing Equation01:21

The Swing Equation

335
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.
In a steady-state operation, the mechanical torque (Τm) supplied to the generator is balanced by the electrical torque...
335

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Related Experiment Video

Updated: Jun 8, 2025

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
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Catch the wind: Optimizing wind turbine power generation by addressing wind veer effects.

Linyue Gao1, Christopher Milliren2, Teja Dasari3

  • 1Department of Mechanical Engineering, University of Colorado Denver, 1200 Larimer Street, Denver, CO 80204, USA.

PNAS Nexus
|November 7, 2024
PubMed
Summary

This study introduces a new yaw control strategy to reduce wind turbine power losses caused by wind veer. The method optimizes turbine alignment, showing potential for over 10% energy gains and significant economic benefits.

Keywords:
field campaignwind energywind turbine controlwind veeryaw control

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Area of Science:

  • Renewable Energy Engineering
  • Atmospheric Science
  • Control Systems

Background:

  • Wind turbines (WTs) experience power losses due to wind veer, which is wind direction variability with height.
  • Current WTs use single-point wind measurements, failing to account for veer and impacting efficiency.

Purpose of the Study:

  • To develop and evaluate a novel yaw control strategy that optimizes WT alignment under wind veer conditions.
  • To enhance power generation efficiency and economic viability of wind farms.

Main Methods:

  • Implemented a yaw control strategy using a yaw-bias-look-up table correlating yaw adjustments with wind speed and wind veer data.
  • Conducted month-long field campaigns on a utility-scale WT and a research turbine, comparing performance against standard controls.
  • Utilized LiDAR and meteorological towers for wind veer and profile data.

Main Results:

  • Demonstrated notable energy gains, with potential net gains exceeding 10% during extreme wind veer conditions.
  • Economic analysis indicates annual net gains up to ~$700K for a 100-MW wind farm with minimal investment.
  • The strategy shows potential for greater gains in offshore settings with larger turbines.

Conclusions:

  • The proposed yaw control strategy effectively mitigates power losses from wind veer.
  • Advanced, cost-effective control strategies offer significant opportunities to improve WT performance in realistic atmospheric conditions.