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The complete wind turbine speed control firstly proposed here also improves the tracking effect of wind turbine rotating speed to variable wind speed. Wind turbine rotating speed synchronized power observer compensates the power ripple of wind turbine resulted in inverter dead time. A low pass filter used at the output of MPPT controller smoothes the speed reference, which makes the rotating speed of wind turbine more stable.

本文首次提出的变转速扰动的MPPT控制提高了风车最大功率点追踪的快速性和稳定性,风车完全转速控制提高了风车转速对变动风速的跟踪效果,转速同步风车功率观测法消除了逆变器死区所造成的风车功率波动的影响,带有低通滤波器的MPPT控制器使得风车的转速更加趋于平稳。

The governor is designed with model structure. Closed-loop start-up strategy is applied during running and it realizes three adjust mode-frequency, wicket gate and power.

调速器采用模块结构进行设计,在调节过程中实现了闭环开机控制策略,并可在频率调节、开度调节、功率调节三种调节模式之间自动或手动无扰动切换。

DC power transmission simulationmodel is set up in this paper with the Matlab software, and various faults such as single-phasegrounding short circuit, phase to phase short circuit, three-phase circuit grounding shortcircuit and inverter bridge short circuit are simulated in this model.

用MATLAB软件建立了电力系统直流输电仿真模型,模拟了单相接地短路故障、相间短路故障、换流器桥臂以及单桥故障,经过近百次仿真运行,得出了各种故障下的特性曲线,准确描述了直流输电系统在发生大扰动后的暂态过程,并从理论上进行了科学分析,得出了各种故障对换相失败的影响。

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It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发,分析对称连杆曲线上鲍尔点的产生条件,提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品,年生产总值3000万美元,产品价廉物美、选料上乘、质量保证,深受国内外客户的青睐

The eˉtiology of hemospermia is complicate,but almost of hemospermia are benign.

血精的原因很,以良性病变为主。