University of South Wales Master of Sciences Thesis
tải về 6.62 Mb. Chế độ xem pdf
|
- Điều hướng trang này:
- 2.3.1. Wind Energy Conversion System
| 2.3. Wind Turbine
Wind turbines are used to generate electricity from kinetic power of the wind i.e. the generation of wind energy primarily depends on the wind speed [22]. To enhance the energy capture, the turbine is mounted on a tall tower. Wind is an intermittent resource; however, wind turbines are not unreliable technology. Modern wind turbines capture more than 90% of available energy from wind, compared with fuel efficiency between 30- 40% for a conventional coal fired station, which typically loses a significant portion of energy through heat loss and pollution. Some advantages of using wind turbines to generate power are - Environmentally friendly. - Produce no pollution. - No traditional fuel required. Standalone hybrid generation system for the remote area of Thar, Pakistan - Requires relatively little maintenance. - Longer life-time (up to 30 years). Disadvantages - Interference with radio/TV signals if located inappropriately. - The wind doesn’t blow all the time at required speed. - High initial cost. The main components of a wind turbine are the rotor of the turbine, which is the prime mover, and the induction generator. The rotor is connected to the generator via a gearbox, which matches and enhances the rotational speed. As the wind does not blow all the time nor does the sun shine all the time, solar and wind power alone can be poor power sources for a long time energy supply. Hybridizing solar and wind power sources together with storage batteries to cover the periods of time without sun or wind provides a realistic form of power generation. 2.3.1. Wind Energy Conversion System The proposed system consists of a variable speed wind turbine, an interior type permanent magnet synchronous generator and a PWM controlled rectifier. The variable speed wind turbine captures aerodynamic power from the wind. The interior type synchronous generator converts this wind power to useable electrical power. The PWM controlled rectifier is used to capture optimum aerodynamic power by controlling the generator’s rotor speed. The structure of the wind energy conversion system is shown below: - tải về 6.62 Mb. Chia sẻ với bạn bè của bạn:
|