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Related Concept Videos

Generation of Three-Phase Voltage01:21

Generation of Three-Phase Voltage

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.
As the rotor...
Wind Turbine Machine Models01:24

Wind Turbine Machine Models

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...
Turbine-Governor Control01:17

Turbine-Governor Control

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...
Generator Voltage Control01:21

Generator Voltage Control

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, use...
Faraday Disk Dynamo01:23

Faraday Disk Dynamo

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...
Electric Generator: Alternator01:25

Electric Generator: Alternator

Electric generators induce an emf by rotating a coil in a magnetic field. A simple alternator is an AC generator that creates electrical energy that varies sinusoidally with time. A simple alternator consists of a conducting loop that is placed inside a uniform magnetic field. The loop is connected to split rings connected to the external circuit with the help of brushes.
The magnetic flux passing through the coil varies sinusoidally as the loop rotates inside the magnetic field. This...

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Related Experiment Videos

Potential for wind-generated electricity in China.

Michael B McElroy1, Xi Lu, Chris P Nielsen

  • 1School of Engineering and Applied Science and Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA. mbm@seas.harvard.edu

Science (New York, N.Y.)
|September 12, 2009
PubMed
Summary
This summary is machine-generated.

Wind energy in China presents a significant alternative to coal, offering substantial carbon dioxide emission reductions. With favorable pricing, wind power could meet all projected 2030 electricity demand and displace a significant portion of coal-generated electricity.

Related Experiment Videos

Area of Science:

  • Renewable Energy
  • Environmental Science
  • Energy Policy

Background:

  • Coal is a primary energy source in China, contributing to significant carbon dioxide emissions.
  • There is a growing need for sustainable energy alternatives to meet rising electricity demand.
  • Government policies, including bidding processes, influence the adoption of new energy sources.

Purpose of the Study:

  • To assess the potential for wind-generated electricity in China.
  • To evaluate wind power's capacity to meet future electricity demand and reduce coal reliance.
  • To analyze the economic viability of wind energy under current government-approved bidding processes.

Main Methods:

  • Utilized wind fields derived from assimilated meteorological data.
  • Assessed wind power potential within the framework of China's existing government-approved bidding process.
  • Analyzed scenarios based on guaranteed electricity prices (0.516 RMB/kWh) and concession prices (0.4 RMB/kWh).

Main Results:

  • Wind energy has the potential to meet all of China's projected electricity demand for 2030.
  • A concession price as low as 0.4 RMB/kWh could enable wind power to displace 23% of coal-generated electricity.
  • The study confirms substantial savings in carbon dioxide emissions are achievable with increased wind energy adoption.

Conclusions:

  • Wind power is a viable and significant alternative to coal for electricity generation in China.
  • Favorable pricing structures can accelerate the integration of wind energy into the national grid.
  • Increased wind energy deployment can substantially contribute to China's carbon emission reduction goals.