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。
By quickly storing and delivering charge, batteries could accommodate fluctuations in supply and demand, and help to incorporate variable sources of power such as wind and solar.
通过快速的存储和高效率的充电模式，电池可以很快的调节供应和需求之间的平衡，同时又可以吸收其他多变的能源，例如风能和太阳能。
Wind and solar energy are variable by nature: the sun doesn't always shine, and the wind doesn't always blow.
风能和太阳能随大自然而变化：太阳并不是总有光芒，风不是一直在吹。
Wind load is a main variable in OCS design, its right selection is very important for safety operation of OCS and economic efficiency of the system.
风荷载是接触网设计中主要的可变荷载，风速取值的正确与否对接触网的运行安全及系统的经济性至关重要。
An ABB variable speed drive system is to power the giant fan that generates subsonic wind speeds at Boeing's flagship wind tunnel in Philadelphia.
ABB的一个变速驱动系统正在为波音公司在费城的旗舰风洞的大型风扇提供动力，以制造出次音速风速。
Flashing amber lights and variable message signs on the Shenzhen Bay Bridge and approach roads will be activated to alert motorists on strong wind conditions.
沿深圳湾公路大桥及附近道路的黄色灯号及可变讯息标志将会启动，以提醒驾驶人士小心强风。
Based on switch mode sensor of relative wind direction, we present a kind of tracing wind fuzzy control system with constant sample cycle and variable control cycle.
基于开关式相对风向传感器，提出一种固定周期采样、变周期控制的风向随动模糊控制系统。
The low-frequency instability in variable speed constant frequency doubly fed induction generator(DFIG) widely used in wind power generation is investigated.
研究了广泛应用于风力发电的变速恒频双馈感应电机系统中的低频不稳定现象。
The decoupled control of active power and reactive power is a key technology of variable speed constant frequency (VSCF) wind energy generation system.
双馈发电机的有功和无功功率的解耦控制是变速恒频（VSCF）风力发电系统的关键技术。
Variable speed wind turbine is one of hot research fields in large wind turbines these days.
变转速风力机是当前大型风力机研究领域的研究热点之一。
Wind load is a kind of variable, horizontal load and it shall not be generally defined as an eccentric load.
风荷载是可变荷载、水平荷载，不能笼统地视为偏心荷载，应参与基本荷载组合计算，并参与偶然荷载组合验算。
The good or bad of variable pitch system affects wind generating set efficiency, safe operation and stable operation to a large extent.
变桨距系统的好坏很大程度地影响风力发电机组的效率、安全运行与稳定运行。
Remember what I've taught you. Keep in mind variable humidity and wind speed along the bullet's fight path. At this distance you'll also have to take the coriolis effect into account.
记住我跟你说过的，风速和湿度会使弹道发生变化。这个距离的狙击必须考虑到复合偏向作用。
With the stand-alone wind turbine capacity of large-scale, variable pitch control, a kind of wind power generation technology, is being more and more attention for its efficiency and practicality.
随着风力发电机组单机容量的大型化，变桨距控制风力发电技术因其高效性和实用性正受到越来越多的重视。
In order to meet the constant power control requirements of wind turbines, the wind turbine model was linearized at the operation points, thus variable pitch PID control of wind turbines is achieved.
为了满足风力发电机的恒功率控制要求，对其模型在运行工作点处进行了线性化处理，从而实现了风力发电机变桨距的PID控制。
A virtual wind chamber was proposed to accurately predict entrainment rate of the ejector at variable mainstream speed.
提出了一种虚拟风室模型，以精确计算引射器在各种主流速度下的引射空气量。
The torque control, pitch control and general wind turbine coordinate control strategy of variable speed adjustable pitch wind turbine were researched.
针对变速变距机组的转矩控制、桨距控制以及整机的协调控制进行了研究。
This paper introduces the control method for the Wind Turbine Units of constant speed constant frequency and variable speed constant frequency.
文章介绍了恒速恒频及变速恒频并网型风力发电机组的控制方法。
Based on the aerodynamic test of plane models under different positions, the variable Angle system used in low-speed wind tunnels is designed in this paper.
基于对飞机模型在不同姿态下进行的空气动力学测试，文中设计了用于低速风洞的变角度系统。
The presented linearized model of doubly-fed induction generator is suitable to the related researches of doubly-fed variable speed wind turbines.
文中提出的双馈感应发电机线性化模型适用于变速恒频双馈风力发电系统的相关研究。
A variable speed constant frequency wind power generation system of doubly-fed induction generator based on converter excitation was described.
建立了基于变换器励磁的双馈感应电机的变速恒频风力发电功率控制系统的模型。
An adaptive feedback linearization controller for a variable speed wind turbine system is proposed.
针对变速风力发电系统提出了一种自适应反馈线性化控制器。
In recent years, the variable speed constant frequency wind generator system is the most widely question for discussion at home and abroad, especially for doubly-fed induction.
变速恒频风力发电系统是近年来国内外研究最广泛的课题，其中最具代表性的是绕线式转子双馈异步发电系统。
MW variable speed constant frequency wind turbine from shenyang university of technology is a variable pitch wind turbine, it can change pitch to adjust power above rated wind speed.
由沈阳工业大学研制的MW级变速恒频风电机组属于变桨距型机组，它在额定风速以上进行变桨距调功控制。
The research in this thesis is focused on the low harmonic variable-frequency power for the system meeting the needs of wind tunnel propeller model testing requirements.
旨在研究满足螺旋桨飞机模型风洞试验要求的为高功率密度电驱动系统供电的低谐波变频电源。
The structure and control of direct-driven permanent magnet synchronous wind power generation system are analyzed, and the development direction of variable speed wind power generation is introduced.
对直驱式永磁同步风力发电系统的结构与控制进行了分析，并展望变速风力发电的发展趋势。
This paper proves that all the forms of wind wave frequency spectrum can be converted into the forms of variable dimension fractals.
文中还证明，各种形式的风浪频谱均可转化为变维分形的形式。
This paper proves that all the forms of wind wave frequency spectrum can be converted into the forms of variable dimension fractals.
文中还证明，各种形式的风浪频谱均可转化为变维分形的形式。
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