相关实验视频
概括
全球电力需求将增加,本世纪可再生能源的贡献有限. 煤炭和核电是关键的替代能源,核电对环境的风险比煤炭要小.
科学领域:
- 能源政策 能源政策
- 环境科学环境科学
- 发电的发电方式是:发电.
背景情况:
- 全球电力需求预计将在未来几十年内大幅增加.
- 节能努力越来越多地集中在减少石油消耗上.
- 可再生能源在20世纪内满足不断增长的电力需求的潜力仍然不确定.
研究的目的:
- 为了面对不断增长的需求,评估电力扩张的实际替代方案.
- 为了比较煤炭和核电发电对环境的影响.
- 强调探索包括核能在内的所有能源选项的重要性.
主要方法:
- 能源的比较分析.
- 对环境影响评估的审查.
- 政策和未来能源场景评估.
主要成果:
- 可再生能源可能不会在短期内对电力扩张做出重大贡献.
- 煤炭和核电被确定为满足增加的电力需求的主要实际替代方案.
- 核电对环境的影响被认为不如煤炭那么严重,即使考虑到像三里岛这样的事件.
结论:
- 持续依赖像煤炭这样的化石燃料带来了重大的环境挑战.
- 核能,尽管过去的事件,提供了相对较低的环境风险,大规模发电.
- 保持和探索所有能源选择,特别是发展和利用核能,以可持续地满足未来的能源需求至关重要.
相关概念视频
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...
As the rotor...
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...
Secondary Distribution
Secondary distribution systems provide electrical energy at the utilization voltage levels from distribution transformers to customer meters. Typical secondary voltages in the United States include 120/240 V for residential use, 208Y/120 V for residential and commercial use, and 480Y/277 V for industrial and high-rise commercial use.
In residential areas, 120/240 V single-phase, three-wire service is commonly used for lighting, outlets, and large appliances. Urban areas with high-density loads...
In residential areas, 120/240 V single-phase, three-wire service is commonly used for lighting, outlets, and large appliances. Urban areas with high-density loads...
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...
The magnetic flux passing through the coil varies sinusoidally as the loop rotates inside the magnetic field. This...
Control of Power Flow
There are several methods to control power flow in power systems:
Power System Distribution
Power system distribution involves delivering electrical energy from power plants to consumers through a network of transmission and distribution systems. The process begins at power plants, where energy from coal, gas, nuclear, water, and wind is converted into electrical energy. These plants use three-phase generators, typically rated between 50 to 1300 MVA, with terminal voltages ranging from a few kV to 20 kV, depending on the size and age of the units.
The transmission system is designed...
The transmission system is designed...