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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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Yaw control is the part of
Solar concentration collector
OTEC devices
Biomass energy generator
Wind energy conversion system
Wind energy conversion system
Quick Summary: Yaw control is a mechanism in horizontal-axis wind turbines (HAWT) used to rotate the nacelle to keep the rotor plane perpendicular to the incoming wind direction. This ensures maximum wind energy capture by aligning the turbine effectively with the wind stream.
Yaw control is a mechanism in horizontal-axis wind turbines (HAWT) used to rotate the nacelle to keep the rotor plane perpendicular to the incoming wind direction. This ensures maximum wind energy capture by aligning the turbine effectively with the wind stream.
P=21ρAv3Cp — Power extracted from wind, where yaw misalignment reduces the effective swept area A or the efficiency coefficient Cp
Pθ=P⋅cosn(θ) — Approximate power reduction based on yaw error angle θ
The wind vane measures the misalignment between the wind direction and the rotor axis. An electronic controller processes this signal and activates the yaw drive (a motorized gearbox system) to rotate the nacelle until the wind vane indicates alignment is restored. This dynamic adjustment is essential because wind direction changes continuously, and misalignment significantly reduces the power output and increases mechanical fatigue loads.
Yaw system prevents excessive cable twisting by using an 'un-yaw' algorithm if the turbine rotates in one direction for too long.
Maximizes the power coefficient (Cp) by maintaining optimal aerodynamic angle of attack.
Essential for horizontal-axis turbines; vertical-axis turbines are generally omnidirectional.
Reduces unsymmetrical aerodynamic loading on the rotor blades.
Maximizes energy yield
Reduces structural fatigue by minimizing asymmetric loads
Adds mechanical complexity and cost
Requires active power consumption for yaw motors
Utility-scale wind farms
Offshore wind turbines
Yaw error is the angle between the wind vector and the rotor shaft axis.
Other options are incorrect: Solar collectors use solar tracking (azimuth/elevation), OTEC uses thermal gradients in ocean water, and biomass systems rely on thermal/chemical processing.
D is correct — Yaw control is a fundamental component of horizontal-axis wind energy conversion systems used to align the rotor with the wind direction.
In wind power, remember that yaw control is for horizontal alignment (azimuth), while pitch control is for rotor blade angle adjustment to manage power at high wind speeds.