A Small Summary

The following are some of the questions that I am studying on and the answers I have found. I have generally summarized it and thus to post them out.

-The physics principle behind wind energy?

Basically, the physics principle is called The Law of Conversion of Energy. The principle states that energy cannot be created or destroyed, it can only be changed from one form to another. The total quantity of matter and energy available in the universe is a fixed amount and never any more or less.

In our case, the Law of Conversion of Energy is applied on the wind energy. The wind energy is converted into other forms of energy that can be used by human directly.

-How the method actually work?

An exemplary embodiment includes a wind turbine system. The wind turbine system includes a wind turbine generator operable to supply wind turbine power to a utility system. A converter is coupled to the wind turbine generator and the utility system. The wind turbine system also includes a controller comprising an internal reference frame of the wind turbine generator, coupled to the converter, and configured for modulating flow of power through the converter in response to frequency disturbances or power swings of the utility system relative to the internal reference frame.

Wind turbine generators are regarded as environmentally friendly and relatively inexpensive alternative sources of energy that utilize wind energy to produce electrical power. A wind turbine generator generally includes a wind rotor having turbine blades that transform wind energy into rotational motion of a drive shaft, which in turn is utilized to drive a rotor of an electrical generator to produce electrical power. Modern wind power generation systems typically take the form of a wind-farm having multiple such wind turbine generators that are operable to supply power to a transmission system providing power to a utility system.


In traditional power systems, the frequencies of the synchronous generators of the power system match the utility system and the dynamic response of the frequency of the utility system is dependent upon the inertia of the synchronous generators and loads. Synchronous generators used in a traditional power system are able to contribute in frequency and voltage control of the power system during transient conditions, that is, sudden failure of generation, line fault or connection of a large load. During of transient conditions, the system frequency starts to change at a rate mainly determined by the total angular momentum of the system. The total angular momentum is a sum of the angular moment of all the generators and rotating loads connected to the power system. In such transient conditions, the synchronous generators may also provide additional control services that modulate active power to stabilize the power system and restore frequency to its nominal value.

Reference:
http://www.freshpatents.com/System-and-method-for-utility-and-wind-turbine-control-dt20070531ptan20070120369.php

-The importance of producing wind energy?

Why do we have to develop wind energy so urgently. There are two main reasons.

1)Environment protection.

Reducing global warming.
The build-up of global warming pollution is not only causing a gradual rise in average temperatures, but also increasing fluctuations in weather patterns and causing more frequent and severe droughts and floods.
As everyone knows, the burning of fossil fuel will produce a large amount of carbon dioxide, and the use of wind energy will greatly reduce the situation. From specific research, US scientists find that using wind energy can help reduce total U.S. emissions of carbon dioxide by almost a third. Since carbon dioxide is the major pollutant which contributes to global warming by trapping the sun's rays on the earth as in a greenhouse, the decrease of carbon dioxide in the atmosphere means a new hope for us.

Preventing acid rain.
Sulfur dioxide and nitrogen oxide are two most important sources of acid rain while the burning of fossile fuel will greatly produce sulfur dioxide and nitrogen oxide.The use of wind energy will largely prevent the acid rain. For example,in the United States, development of just 10% of the wind potential in the 10 windiest U.S. states would not only provide more than enough energy to displace emissions from the nation's coal-fired power plants but also eliminate the nation's major source of acid rain.

2) The urgency of fossil fuel.

Traditionally, people get the energy that can be directly used by burning fossil fuel and converting it. However, as the larger and larger amount of usage of fossil fuel, the resource of fossil fuel becomes very urgent now and it takes millions of years to form fossil fuel. As a result, it is very important to find a new resource of energy to replace it and wind energy is a quite ideal energy to be used now.(The reason can be seen in Yeiqi's post).

By Xiaolu