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频率扫描
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  frequency scan
    On the basis of current harmonic research, harmonic analysis program is developed as a module of Power System Analysis Software Package (PSASP) in this paper, which includes modeling of power system components, frequency scan for system response, harmonic power flow for balanced system and for unbalanced system.
    本文针对谐波对电力系统的影响和谐波治理的现状,在当前研究水平的基础上,在PSASP 的数据平台上开发了电力系统谐波分析程序,其中包括谐波分析中的各种系统元件的建模、系统频率扫描、对称系统及不对称系统谐波潮流计算等分析功能。
短句来源
  frequency scanning
    Frequency scanning in the subsynchronous frequency range is performed to calculate the subsynchronous electrical damping characteristics of the unit under subsynchronous frequency, thus the influences of various excitation systems, in which PSS is not equipped or PSSs with different input signals are equipped, on electrical damping characteristics of unit are analyzed, and the effects of parameters of PSS on electrical damping are also researched.
    通过频率扫描计算发电机组在次同步频率下的电气阻尼特性曲线,从而对各种励磁系统在无PSS以及装设不同输入信号的PSS情况下对电气阻尼特性的影响进行了分析; 并分析了PSS参数对电气阻尼特性的影响。
短句来源
  “频率扫描”译为未确定词的双语例句
    To Yangcheng power plant,the result shows that there is only one electric resonant point in the subsynchronous frequency range,but it doesn′t indicate an induction generator effect.
    利用频率扫描分析法研究了由阳城至淮阴串联补偿线路引起的次同步谐振(SSR)问题,研究表明,阳城电厂机组在次同步频率下有一电气谐振点,但阳城电厂机组不会发生异步发电机效应。
短句来源
    Various frequency constant current is injected to second side of PT (potential transformer) which the petersen coil is the first side.
    本方法采用带PT的消弧线圈,从PT低压侧注入零序恒流信号,通过频率扫描确定系统的谐振频率,再由公式计算出脱谐度,然后根据脱谐度的预先设定的偏离值调节消弧线圈分接头,实现消弧线圈的调谐。
短句来源
    The vector network analyzer (VNA) can precisely describe the property of a device according it’s amplitude/phase responses to frequency and power scan of measurement signals.
    矢量网络分析通过测量元件对频率扫描和功率扫描测试信号的幅度与相位响应,来精确表征元件特性。
短句来源
    Various frequency constant current is injected to second side of PT (potential transformer) which the magnetic valve arc extinguishing coil is the first side. Arc extinguishing coil tuning system is implemented, which is based on measuring the system resonance frequency.
    本方法采用带PT的磁阀式消弧线圈,从PT低压侧注入零序恒流信号,通过频率扫描确定系统的谐振频率,再由公式计算出脱谐度,然后根据脱谐度的预先设定的偏离值调节消弧线圈分接头,实现消弧线圈的调谐。
短句来源
    After time domain simulations using electromechanical transient analysis programs, the open-loop transfer function between the current reference signal of the HVDC constant current regulator and the active power flow in the parallel AC tie line is identified by Fourier resolution and curve fitting.
    然后在直流系统整流侧定电流调节器电流参考环节对测试信号进行频率扫描 ,激发并联交流联络线有功功率振荡 ,通过时域仿真和频域分析 ,辨识开环传递函数 ;
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  frequency scan
The high resolution spectra are measured tuning the length of a CO2 waveguide laser by means of a PZT yielding a frequency scan of 230 MHz around the CO2 laser lines.
      
Our frequency scan data, as well as our data for the time course of resistance and capacitance, show that the fast change is associated with both the under-the-cells and between-the-cells resistance.
      
The high sensitivity of the intracavity arrangement allowed very strong double-resonance and two-photon transition signals to be observed with high microwave-frequency scan-rates (1 GHz/min), and low microwave pumping powers (≦10mW/cm2).
      
In this way an idler frequency scan of 100-150?GHz could be obtained, after which the signal frequency hops ahead over the FSR of the intracavity etalon of the OPO (207?GHz).
      
Low noise, mode-by-mode absorption spectra are recorded at a high acquisition rate (laser frequency scan greater than 400?GHz/s) and covering four orders of magnitude in absorption coefficient.
      
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  frequency scanning
In the second case, the Brewster reflection conditions are not realized, and the variations in the intensity of the reflected light observed upon frequency scanning are smaller.
      
A diplexer of this type can be used for discrete frequency scanning of high-power wave beams in systems for the suppression of the hydrodynamic instabilities of plasma in magnetic traps.
      
Amorphous carbon films were examined by low frequency scanning-probe acoustic microscopy (LF-SPAM).
      
Our results showed that the low frequency scanning-probe acoustic microscopy is a useful method for imaging subsurface defects with high resolution.
      
Frequency scanning of the laser is provided by acoustooptic modulation.
      
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  scanning frequency
The results demonstrate that this system has a scanning range of 1 520 nm-1 575 nm, and the wavelength detection accuracy is less than 2 pm with 1.5 Hz scanning frequency.
      
The relationship between the scanning conditions, specifically laser output power, scanning distance, scanning frequency and the characteristics of particle transportation, was investigated using micron-sized polystyrene latex particles.
      
Populations of levels and dynamics of resonant fluorescence at scanning frequency of the laser radiation with linear and circular polarizations are considered.
      
Because the scanning frequency and repetition rate is high in comparison with the characteristic time-scale of the flow, the evaluation provides a complete time-record of the 3D flow during the starting process.
      
Fluctuations of humidity were measured by an "OPHIR", an infrared humidity sensor with a 10 Hz scanning frequency and humidity spectra were produced.
      
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In this paper, the freguency-scanning method is used to analyse muitimachine system. A lot of frequency characteristics of Northwest system are calculated by EMTP. The judgement on SSR possibility of 330 kV Northwest network with high series-capacitor compensation is available.

本文应用频率扫描法与特征值法研究了单机—无限大系统的次同步谐振问题,并获得一致性后,将频率扫描法应用于多机系统。用EMTP程序对西北系统作了大量频率特性的计算,得出了关于西北330千伏主网高串补下次同步谐振可能性的判断。

The relationship between complex torque coefficients and eigenvalues in subsynchronous resonance analysis isderived by using the complex variable function thoery. The thoeretical basis and the utilization conditions of thecomplex torque coefficient method are established. Furthermore, based on the frequency scan results. an estimation algorithm of eigenvalues corresponding to the subsynchronous resonance modes is proposed. Simulations on IEEE first benchmark system show that the estimated eigenvalues are well...

The relationship between complex torque coefficients and eigenvalues in subsynchronous resonance analysis isderived by using the complex variable function thoery. The thoeretical basis and the utilization conditions of thecomplex torque coefficient method are established. Furthermore, based on the frequency scan results. an estimation algorithm of eigenvalues corresponding to the subsynchronous resonance modes is proposed. Simulations on IEEE first benchmark system show that the estimated eigenvalues are well consistent with their true values.

应用复变函数理论导出了复转矩系数与特征值之间的关系,从而建立了复转矩系数法的理论基础和使用条件。进而提出了一种根据复转矩系数频率扫描的计算结果来估算次同步谐振模式特征值的方法。对IEEE典型算例系统的仿真计算表明,特征值的估算值与其实际值相吻合。

This paper first analyzes the SSO characteristics caused by the Ge Nan HVDC link and the Three Gorges HVDC link using the UIF method,then analyzes the SSR characteristics caused by Yangcheng Huaiyin 500kV series compensation line using the frequency scanning method.The result shows that the interactions between the HVDC links and the generators in East China electric power system are very low,so it′s unlikely that the generators in East China electric power system will be SSO unstable.To Yangcheng power plant,the...

This paper first analyzes the SSO characteristics caused by the Ge Nan HVDC link and the Three Gorges HVDC link using the UIF method,then analyzes the SSR characteristics caused by Yangcheng Huaiyin 500kV series compensation line using the frequency scanning method.The result shows that the interactions between the HVDC links and the generators in East China electric power system are very low,so it′s unlikely that the generators in East China electric power system will be SSO unstable.To Yangcheng power plant,the result shows that there is only one electric resonant point in the subsynchronous frequency range,but it doesn′t indicate an induction generator effect.

针对华东电网可能产生的次同步振荡(SSO)问题,利用机组作用系数法(UIF)研究了三峡直流输电对华东电网次同步振荡的影响,研究表明,直流输电线路与华东电网内发电机组的相互作用很弱,不会引起华东电网内的发电机组的次同步振荡。利用频率扫描分析法研究了由阳城至淮阴串联补偿线路引起的次同步谐振(SSR)问题,研究表明,阳城电厂机组在次同步频率下有一电气谐振点,但阳城电厂机组不会发生异步发电机效应。

 
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