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Accordingly, it is necessary to consider that shunt reactor should be cut off in the operation mode of heavy load. This paper analyzes the roles of shunt reactors...
理论分析与仿真研究表明,所提出的线路保护与并联电抗器之间的动作逻辑关系不仅保证了750kV输电线路正常经济运行,又达到了并联电抗器抑制过电压等方面的作用。
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And compares the function of series capacitor with that of shunt capacitor.
串联电容器与并联电容器作用的对比。
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This article combines two fields which are laser minuteness process and parallel mechanism to put forward 3-DOF parallel platform used in the laser minuteness process system.
本文结合激光微细加工与并联机构两个领域,提出了用于激光微细加工系统的三自由度并联平台课题。
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Both parallel resonance and series resonance are the two important parts of harmonic resonance problem.
串联谐振与并联谐振共同组成谐振问题的两个重要分支。
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After the tripped phase current from shunt reactor was calculated using the transient fault model as the prototype whether transient or permanent fault, the difference between the calculated current and the measured one of the fault phase from shunt reactor was employed to identify permanent fault. When the single-phase fault is transient, the calculated current is close to the actual measured current.
该方法以瞬时性故障为参考模型,求取并联电抗器故障相电流,采用该求取电流与并联电抗器故障相实际测量电流之差同中性点小电抗器电流幅值比来实现永久性故障的判别。
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There are not relations between the design complexity and number of parallel units, and it is easy to equalize the DC current of different unit through vector group changing. Simulations and experiments prove that the present technique is right and effective.
该调制方法不仅保持了传统SVPWM技术的所有优点,且实现简单,其控制策略的复杂程度与并联单元的数目无关,仿真和试验验证了方法的正确性和有效性。
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Implement shunt-wound control of the two elevators is realized by following methods: sending the calling signals and phreatic signals to PLC and through the centralized disposal of the control program and shunt-wound attempter program, and then giving on-of control signal to gating system, transducer and all kinds of displays at appropriate time.
将2台电梯的呼梯信号、井道信号全送至PLC,经PLC内的控制程序与并联调度程序集中处理后向门机系统、变频器和各类显示器适时地发出开关量控制信号,由此对两台电梯实施并联控制。
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The following exciting results are derived: 1 When considering the influence of some nonlinear elements such as hard-limit of exciters, the effects of some devices such as Power System Stabilizer, Unified Power Flow Controller and Static Var Compensator as well as using real parameter values of power systems in simulation , the SNB surface and the HB surface on the boundary of small signal stability region will turn close to each other and even coalesce together; 2 Under some conditions, coupling between slow exciters and shunt capacitors will bring negative damping in power system dynamics, which increases the possibility of oscillatory instability, so that a power system with mass shunt compensators is easily subjected to the oscillatory instability.
同时发现:1 系统中的慢速励磁,在某些情况下会与并联补偿电容器组产生负阻尼现象而显著降低系统的动态性能,大大增加系统出现振荡失稳的可能性;2 在采用较多并联电容器组补偿的电力系统中,更容易出现振荡型失稳。
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The main work of this paper: Firstly, Basing on the summarization and analysis of the walking mechanism, Parallel drive five-bar mechanism is applied for walking mechanism. And then the characteristic of the trail and positive kinematics as well as reverse kinematics are discussed. Secondly, the model of walking mechanism is established according to Parallel drive five-bar mechanism, and then a figure planning is designed for the foot-end trail. The characteristics of the parallel drive are emphasized to research in this paragraph by the method of insert value. At last, the simulation is performed in the ADAMS to compare the real result to the theoretical value. Thirdly, a sealed structure of a Quadruped Walking Robot is designed and established. The whole control system, including motor, sensor and control circuit, is sealed in the robot. Walking is derived in the way of the shaft driving and the dynamic torque sensor is used to the surrounding conditions of the robot's foot-end to be the foundation of the robot's control. At last, the applying principle of the dynamic torque sensor is researched in detail basing on the traditional sensor of the walking robot. Moreover, the principle is divided into several sorts to discuss. Finally, simulation and verification of the monitor principle are come through in the Mechanism of the Pro/Engineer.
论文的主要工作有:在对传统步行机构总结分析的基础上,提出将平面并联五杆机构应用于四足步行机器人的腿部结构,并对其轨迹特性、正运动学、逆运动学特性做了详细计算分析;依据平面并联五杆机构的模型,建立机器人步行机构的实体模型,对其足端的轨迹做了图谱规划,并利用插值法对并联驱动端的特性曲线作了研究,并在ADAMS中进行仿真,将结果与理论值相比较;然后设计了一套四足步行机器人密封装配结构设计方案,建立四足步行机器人单足结构、驱动以及传感器监测的三维实体模型,将机器人的整个控制系统,密封装配在步行机器人的机体中,通过轴传动来驱动步行机构实现步行,采用动态扭矩传感器监测步行机构的驱动关节受到的扭矩变化,从而获得四足步行机器人足端的周围情况,为步行机器人的控制方案奠定了基础;论文的最后在分析步行机器人传统控制传感器的基础上,详细分析了动态扭矩传感器的监测原理,并分几种情况分别分析了其监测原理,并在Pro/E的Mechanism模块中实现了监测原理的仿真与验证,最后给出了传感器监测信息与系统判断之间的关系。
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When heavy load is transmitted along a 750 kV transmission line, the connected shunt reactors can lead to big voltage decreasing, so transmitting capacity of line is limited greatly.
为解决线路传输能力与抑制过电压的矛盾,分析研究了并联电抗器在抑制750kV线路跳闸过电压、加速潜供电弧熄灭以及抑制合闸过电压等方面的作用,并由此提出了750kV线路保护与并联电抗器之间动作配合关系。
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capacitor:电容
(5) 电容(Capacitor)这部分的知识有一道考题,主要考查了电容间串联与并联的一些计算题. 这部分的计算并不是很难,题目阅读量少,较易理解,估计不少中国学生会选择这部分的试题. (6) 量子物理(Quantum Physics)是最后一道常规性题目,
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in cooperation with:和...合作,和...协同
Be in force 生效,有效 | In cooperation with 和...合作,和...协同 | In parallel with 与...平行,与...同时,与...并联
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in parallel with:与...平行,与...同时,与...并联
In cooperation with 和...合作,和...协同 | In parallel with 与...平行,与...同时,与...并联 | Instead of 代替,而不是...
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parallel circuit:并联电路
总电压的瞬时值应等于各元件上电压瞬时值之和,即在并联电路(parallel circuit)中,加在各支路上的电压瞬时值是相同的,可用一个共同的复电压 来代表. 总电流的瞬时值应等于各支路上电流瞬时值之和,即上式表示,复阻抗的实部与有功功率(real power)相对应,
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head curve of parallel pumping system:水泵并联扬程曲线
水泵比转速 specific speed of pump | 水泵并联扬程曲线 head curve of parallel pumping system | 水泵参数与特性 Parameters and characteristics of pump
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parallel resonance:并联谐振
本发明提供一种脉动电能非谐振的LED单向驱动电路,其是藉电容性,或电感性、或电阻性阻抗构成第一阻抗,及采用并联后不会产生并联谐振 (parallel resonance)的电感性阻抗与电容性阻抗构成第二阻抗;两者串联后供输入直流脉动电能,
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relevant character:并联字符
ant benefits and cost 相关受益与成本 | relevant character 并联字符 | relevant clauses 有关条文
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shunt:分路
图8是50Ω插入并联(series)与分路(shunt)时的仿真(simulation)电路;图9与图10分别是并联(series)与分路(shunt)时的通过特性图. 为了简化比较因此用祇有电感值(inductance)成份的特性方式表示,也就是说测试结果并无无寄生容量的特性.
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UI:逆变器
与永磁同步发电机(PMSG)相连的二极管整流器(UR),与二极管整流器(UR)相并联的升压斩波电路,与升压斩波电路相并联的滤波储能电容器C和三相逆变器(UI),与三相逆变器(UI)相连的三相变压器或三相滤波储能电感(TR),
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FACTS:灵活交流输电系统
目 录 序 前言 第1章 概述 1.1 灵活交流输电系统(FACTS)和用户电力技术综述 1.2 电力系统并联补偿的特点与作用 1.3 电力系统并联补偿装置的分类 1.4 电力系统并联补偿技术的历史与现状 第2章 并联补偿的理论基础 2.1 瞬时功