3-phase造句

• Electric performance index of the system is given . the ac standard equipment should be 3 - phase output standard resource by which the ac voltage , ac current , power factor , 3 - phase - 3 - line effective power , 3 - phase - 4 - line effective power , reactive power and single phase watt meter , working frequency and phase meter can be examined . the system makes full use of the main computer which has multi function in the examination
  给出了电气性能指标，交流标准装置应为三相输出标准源、使其可校验交流电压、交流电流、功率因数、三相三线有功功率、三相四线有功功率、无功及单相电能表，同时可校验工频频率表及相位表，在校验检测中充分发挥主机多能的作用。
• Then , this thesis presents an algorithn of 2 - terminal quantity fault location based on synchronous gps sampling . this algorithm conducts fault location with only the 3 - phase fundemental wave voltage and current phasors of the 2 terminals of transmission lines and apples to lines of both symmetrical and asymmetrical parameters , irrelerant to the impedence , fault types and transitional resistance of the 2 terminals of lines
  然后，本文提出了一种基于gps同步采样的双端量故障测距算法。该算法仅利用输电线路两端的三相基波电压、电流分量来进行故障定位，不受线路两端系统阻抗、故障类型、过渡电阻等因素的影响，对参数对称线路和非对称线路均适用。
• The stability of electric power system has been being focused for a long time toprevent a power system from losing synchronism after sudden fault ， researchers have done much work and got many accomplishments this paper applied the direct feedback linearization ( dfl ) technique on the power system ， a strong nonlinear system simulation results by matlab proved this method efficiency main works and results are as follows ： this paper compared some existing methods in excitation control ， fast valve control and coordinated control respectively , analyzed the developments and actuality of nonlinear control research in brief , illustrated why ransient stability could be greatly improved by using the fast valve control in chapter 3 ， indicated the importance of coordinated control farther this paper introduced the inverse system theory , based on which ， discussed the dfl theory , pointed out which had consistency with the inverse theory , expanded the dfl theory combined the idiographic model equations ， made which adapt to the model of a single machine - infinite bus power system this paper referenced abundance articles and educed a set of equations ， which could describe the dynamical process of excitation and fast valve control for synchronous generators in the equations ， there were several very important parameters of power system - - rotor angle ( ) ， rotor speed ( ) ， generator q axis voltage ( eq ) ， transient voltage ( e ' q ) ， active power ( pe ) ， mechanical input power ( pm ) ， valve opening ( ) ， generator terminal voltage ( vt ) ， based on the model ， nonlinear coordinated controller and terminal voltage optimal controller have been designed by using the expanded dfl theory and lq optimal control theory the simulation results showed that the controller could keep power system transiently stable under the effects of a symmetrical 3 - phase short circuit fault ， which achieved better postfault regulation compared with another two routine methods ， one is the proportion excitation controller and proportion fast valve controller , the other is the proportion excitation controller and the optimal fast valve controller , which could exert good performance when met 1ittle disturbance either
  在介绍逆系统理论的基础上，详细介绍了dfl理论，通过比较阐明了dfl理论其本质是逆系统方法的一类，并结合具体课题推导出的模型方程将dfl理论进行了扩展，使之适应于电力系统这个强非线性对象。通过参考大量的书籍文献推导出一套实用的可将大型汽轮发电机励磁与汽门综合起来进行控制的模型方程，此模型方程涵盖了电力系统中特别引人注目的几个量- -转子角、转子转速、发电机q轴电势eq 、暂态电势e ' q 、有功功率pe 、机械功率pm 、汽门开度、机端电压vt ，在此基础上建立了实用的电力系统简化的数学模型，并将扩展的dfl理论应用于此模型系统，结合线性二次型最优控制理论设计出大型汽轮发电机的非线性综合控制器及机端电压最优控制器，通过仿真实验与采用常规的按电压偏差进行调节的比例式励磁控制器+汽门比例控制及采用常规的按电压偏差进行调节的比例式励磁调节器和基于二次型性能指标设计的最优快控汽门(考虑发电机的饱和因素)进行了对比，证实了采用此种控制器可以有效地提高电力系统的暂态稳定性，并且在电力系统遭受小干扰时同样具有良好的调节性能。
• The simulation and experimental results illustrate advantages of the inverter : fixed switching frequency , high output - voltage performance , and strong nonlinear load adaptability , etc . finally the three - phase inverter applying output voltage and capacitor - current feedback current spwm control is researched in the paper and the simulation results demonstrate that the 3 - phase inverter is also with a high performance
  本文最后对采用输出电压和电容电流瞬时值反馈的电流spwm控制技术的三相逆变器进行了初步研究，仿真结果显示采用该控制技术的三相逆变器同样具有很好的输出波形。
• The power supply system is 380volts , 3 - phase , which is transformed to 485volts , 3 - phase and then rectified , by solid state silicon rectifier modules , to 600 volts dc , the whole system having a capacity of 500kw . this power is connected to the two overhead power lines to supply the needs of the trolleybuses anywhere along the system
  架空电缆网络采用三百八十伏特三相之供电系统经升压至四百八十五伏特，再经矽质整流器调整至直流六百伏特，整个系统之电功率为五百仟瓦。电源接驳到两条架空电缆供无轨电车使用。
• Then , the theoretical analysis of the 3 - phase reversible rectifier circuit is performed in detail . after that a 1kw 3 - phase pwm rectifier is designed in theory and hi practical . in the third chapter , the computer simulation based on matlab is carried out through the simulation , a number of simulation data are gained for studying the relation between the circuit parameters and the reversible rectifier characteristics
  首先对三相功率因数校正技术作了分析和比较，确定本课题研究的内容，指出其研究价值和意义；然后对三相高功率因数可逆整流电路作了理论分析，并在此基础上，对一个1kw的三相高功率因数可逆整流电路进行了理论设计；利用matlab软件，建立了计算机仿真模型，对系统的整流和逆变工作特性进行了仿真研究，得到了各电路参数和控制参数与系统性能之间的关系。