In addition, a new method to translate from variable wind to constant wind is also presented.

此外，本文还提出一种新的弹道风生成方法。

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Because of the wind speed measurement and accurate system model are hard to obtain, so it's difficult to achieve good results by using the traditional pid controller in case of rapidly variable wind.

由于风速测量的不准确性以及很难获得风力发电系统的精确模型，故采用传统的PID控制器难以在风速快速变化的情况下实现良好的控制效果。

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Wind is inherently variable, so it can never compete with the cheap and dirty coal that generates half of America's electricity.

风一向多变，因此它永远比不上廉价又脏兮兮的煤，后者产出了美国半数电力。

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Dorothy Thompson, chief executive of Drax, told BBC News that biomass was the ideal fuel to balance variable wind power.

BBC: Biomass may hinder climate fight

The NGIPS platform is critical for clean energy, especially variable resources like wind power and solar photovoltaics.

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And as we ramp up our percentage of renewable energy from variable sources like wind and solar, the need for this service is growing.

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