阻抗角

指出在K值相同时，风电场引起的电压变化还与电网阻抗角和风电场功率因数有关。

The simulation demonstrates that even though K value is same , the power grid impedance angle and wind farm power factor may also affect the voltage variation which is caused by wind farm .

控制系统以滤波器的h次谐波阻抗角为控制目标，采用PI调节规律和设定限幅与死区等策略，保证了自动调谐系统的性能和稳定性。

The control system takes the h order harmonic impedance angle as a control objective , adopts a PI regulator and other strategy to ensure the performance and stability of the auto-tuning system .

本文首先采用含有有功功率P、电压U和负荷阻抗角φ的三元分析法研究OLTC变比变化对静态电压稳定性的影响。

Firstly , this article studies the influence of OLTC transformer ratio change on static voltage stability by using the ternary analytical method of voltage U , power P and load impedance angle φ .

本文首先分析了采用电压和功率描述电压临界状态的不足，提出了引入负荷阻抗角的三个参数来描述电压临界状态，即电压V、功率P和负荷阻抗角φ的三元分析法。

The shortcoming of using voltage and power to describe the voltage critical state is analyzed and the load impedance angle is introduced for the critical point of voltage . The ternary analysis method of voltage V , power P and load impedance angle φ is established .

视在阻抗角失步解列判据的改进

Improvement of the apparent impedance angle separation criterion

对系统内任意点电压频率的导数进行推导，并对其特征进行了分析和总结，同时研究了两侧电动势幅值不等和系统内各元件阻抗角不等对电压频率导数特征的影响。

The derivate of voltage frequency at any point inside the system is deduced , then its characteristics are summarized and analyzed .

闪变计算中阻抗角工程实用估算方法是否使用工具进行估算，还是手工完成？

An Engineering Estimation Method of Impedance Angle for Flicker Calculation Was any tool used for function point counting or was the count done manually ?

对母线电压和滤波器电流进行同步采样，利用离散傅立叶变换求取滤波器的谐波阻抗角，进而计算出失谐度。

The harmonic impedance angle is obtained by analyzing the sampled bus voltage and filter current with the help of discrete Fourier transform , then the detuning is calculated .

同时研究了两侧电动势幅值不等和系统内各元件阻抗角不等对频率特征的影响。

Meanwhile , the influences of unequal amplitudes of electromotive forces at both sides and of unequal impedance angles of each component inside the system on frequency characteristics are studied .

本文在考察了闪变计算公式中网络阻抗角数值大小的影响作用后，提出了一种闪变计算中阻抗角工程实用估算方法。

Based on effect of the impedance angle value size in flicker calculation formula , an engineering estimation method of impedance angle for flicker calculation is presented in this paper .

基于单相接地模型，推导得到由故障点两侧零序阻抗角差异引起测量电抗的综合误差，根据综合误差的具体情况对测量电抗进行补偿，从而得到自适应接地距离继电器动作判据。

Based on case of single-phase-to-ground fault , this paper derives the combined error of measured reactance in proportion to the distance to the fault , and provides a new adaptive impedance criterion through error correction .

建立了基于改进下垂控制的逆变器的小信号模型，经过计算分析得出，逆变器相角、阻抗角及各下垂系数都会不同程度的影响稳定性。

The small-signal model of the inverter based on modified droop control is presented . The calculation and analysis show that the phase angle , impedance angle and droop gains all affect the stability in different degree .

通常把线圈看成是纯电感，即认为线圈短路阻抗角为90°，在电感两端电压为零时合闸，可得到最大电流值。

Generally the winding is regarded as a pure inductance , it means that the impedance angle of the winding is 90 °, so we can acquire the maximum current when we close the switch as the voltage of a pure inductance passes through zero .

基波阻抗和触发角的关系是可控串补（TCSC）底层触发控制的关键所在。

The relationship of the fundamental-frequency impedance and the firing angle is the key factor in firing control of TCSC .

为了进一步验证波阻抗随方位角变化（IPVA）方法检测裂缝的能力，展示笔者在裂缝检测研究方面的新进展，本文对胜利油田罗42井区的裂缝分布进行了检测。

In order to examine the capacity using variation of impedance versus azimuth ( IPVA ) to detect the fracture and showing the author 's development in an aspect of fracture detection , the paper detected the distribution of fracture in Luo 42 well zone of Shengli Oilfield .

对於几种排列方案所作的计算表明，利用不均等的元素间距可以在一定程度上控制天线元输入阻抗随着扫描角的变化规律。这可能是解决互耦困难的一种途径。

Several examples are given to show that by properly adjusting the distances between elements , the variation of input impedance of the central element as function of scan angle may be controlled .

通过数值模拟，对纵波弹性阻抗随入射角和方位角的变化特征进行了描述.分析了各向异性参数对不同方位纵波弹性阻抗的影响.以及新近似公式的精度。

Through nu - meral simulation , the variation of P wave elastic impedance with in - cident and azimuthal angle was described ; the effect of anisotropic parameters on P wave elastic impedance in arbitrary azimuth and the precision of new approximation formula were analyzed .

忽略各向异性影响的各向同性弹性阻抗公式不能正确地描述各向异性介质中弹性阻抗随入射角和方位角的变化。

The formulae for isotropic elastic impedance neglecting the effects of seismic anisotropy can 't describe accurately the variation of elastic impedance with incident angle and azimuth .

该方法通过对三相电压和三相电流的波形采样计算出三相阻抗，并利用对数极坐标的非线性分度和能够同时显示阻抗模和阻抗角的特点来进行图示显示。

This method can graph-display the measure result utilized the characteristic of the Log-Polar which is non-linear division and can display the impedance model and impedance angle at the same time .