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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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A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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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,...
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The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered:
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Updated: Jun 12, 2025

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Self-powered temperature-changing system driven by wind energy.

Jiayu Li1,2, Boxun Liu1,2, Mingyang Li3,4

  • 1Center on Nanoenergy Research, Institute of Science and Technology for Carbon Peak & Neutrality, Guangxi University, Nanning, 530004, China.

Microsystems & Nanoengineering
|September 26, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a self-powered temperature control system using a rotary triboelectric nanogenerator (TENG) and ferroelectric ceramics. This innovative device efficiently harvests environmental energy for cooling and heating applications, reducing energy consumption.

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Area of Science:

  • Materials Science
  • Energy Harvesting
  • Nanotechnology

Background:

  • Outdoor, mobile, and self-powered temperature-control devices are crucial for reducing energy consumption in cooling and heating.
  • Existing technologies face limitations in efficiency and energy harvesting capabilities.
  • Ferroelectric ceramics offer promising electrothermal properties for temperature regulation.

Purpose of the Study:

  • To develop a self-powered temperature quantification control system.
  • To integrate a rotary disc-shaped triboelectric nanogenerator (TENG) with ferroelectric ceramics for efficient energy harvesting and electrothermal effect stimulation.
  • To evaluate the system's performance in cooling and heating applications.

Main Methods:

  • Fabrication of a rotary disc-shaped TENG with a maximum open-circuit voltage of 6913 V.
  • Synthesis of a 0.15PbTiO3-0.85PbSc0.5Ta0.5O3 (0.15PT-0.85PST) ferroelectric ceramic with excellent room-temperature electrothermal effects.
  • Integration of TENG and ceramic into a system with energy collecting cups and a circuit management module to harness wind and water energy.

Main Results:

  • The optimized device demonstrated enhanced electrothermal effects, achieving temperature variations of 1.19 K (heating) and 0.93 K (cooling).
  • The system significantly reduced cooling and heating times by 31% and increased temperature changes by 81% compared to previous work.
  • The device achieved a temperature change of 0.49 K in an insulated cup 300 times larger than the ceramic chip, operating at 200 rpm.

Conclusions:

  • The proposed self-powered temperature control system, utilizing a rotary TENG and ferroelectric ceramics, shows great potential for commercialization.
  • The system effectively converts environmental energy (wind, water) into electrical energy to drive the electrothermal effect for efficient temperature control.
  • This research provides a valuable reference for developing energy-efficient cooling and heating solutions, aligning with global carbon neutrality goals.