直流分量

水树对XLPE电缆绝缘电阻与直流分量的影响

Effects of water trees on insulation resistance and DC component of XLPE cable

利用Joint变换的相关性质，可实现实时图象识别。本文提出一种功率谱处理方法，可对实时相关输出中的直流分量和噪声进行抑制，以增强相关信号，提高信噪比。

This paper proposes a new method to process the power spectrum so as to restrain DC component and noise , enhance correlation output signal and increase SNR in the real-time Joint transformation .

滤除CCD噪声中暗流的直流分量以及消除零响应偏移和响应不一致后，可以认为所剩CCD噪声为高斯噪声和椒盐噪声的叠加。

After filtering the above noises the residual CCD noises can be regarded as Gauss noise and pepper-salt noise .

基于直流分量和低频分量的DCT域数字水印嵌入算法

Digital Watermarking Embedded Algorithm in DCT Domain Based on DC and Lower Frequency Component

开关点预置SPWM逆变器输出直流分量的控制

DC Component Output Control for Switching-Nodes Preset SPWM Inverter

采用双极调制方式单周控制APF补偿后的电源电流中存在直流分量。

There are DC off-sets in the compensated source current of the APF with one-cycle control under bipolar modulation .

利用Matlab仿真软件搭建了仿真实验模型，通过改变一次侧电流中非周期直流分量的方向，研究了非周期直流分量对电流互感器的饱和方向、入饱和时间的影响。

Based on the simulation model established with Matlab , influences of DC component on the saturation direction and start time are studied by changing the direction of DC component .

在分块DCT变换的基础上，利用混沌系统确定的位置来抽取相应块的直流分量，经过归一化处理形成零水印。

Based on the DCT-block , we used the chaotic system to extract the DC component , which had been normalized to produce zero-watermark .

由于功率器件的离散性，开关点预置SPWM逆变器输出电压中含有直流分量。

Because of the variations of power devices , DC component is contained in the output voltage of the switching-nodes-preset SPWM inverter .

谐波信号由从THC实测的电压、电流信号减去其直流分量获得。

The harmonic signal is achieved by subtracting DC component from measured voltage or current of the THC .

EMTP仿真表明：与差分滤波相比，本算法对衰减直流分量有更好的抑制能力。

The EMTP simulation shows that the proposed algorithm is better than the conventional processing method .

基于DCT直流分量的数字水印算法容易出现分块效应与可嵌入信息量较少的情况。

Digital watermarking algorithm based on DC component of DCT used to lead to blocking effect and less of the amount of information can be embedded .

以电容电压uc作为同步信号时，故障后系统中未出现明显直流分量，但出现明显的低次谐波。

Taking the capacitor voltage uc as synchronizing signal , there is not serious DC component in the power system , but serious low-order harmonics .

通过电压矢量定向方法，把对交流侧电流的控制转化为对该电流矢量在d轴和q轴的直流分量的控制，从而简化了PWM整流系统控制器的设计。

By the method of voltage oriented control , the AC-side current can be transformation into DC current in d axis and q axis . This can simplify the design of PWM rectifier controller .

基于MSP430单片机硬件模块研制了自动增益控制电路，抑制基线漂移，使直流分量平稳；

In order to make the baseline of signal to be steady , We developed the auto-baseline regulation circuit on the basis of MSP430 MCU ;

500kV系统直流分量对宜兴抽水蓄能电站变压器的影响

Impact of 500 kV System Direct Current Component on Transformers in Yixing Pumped Storage Power Station

快速傅里叶变换（FFT）是电力系统进行谐波分析的主要算法，但当输入信号中含有衰减直流分量时，FFT算法会产生较大的误差。

Fast Fourier transform ( FFT ) is the main algorithm for harmonic analysis in electric power system , but when there is the decaying DC component in input signal , FFT algorithm will have higher error .

在进行交流TIG焊时，需要增加一些较复杂的控制方式，如：阴极雾化作用、消除和减小直流分量、稳定电弧等，以保证焊接的正常进行。

In AC TIG welding , it needs add some complex control method to ensure the quality of welding , such as negative-pole atomization affects , D.C.of elimination and reduce , and arc stabilizing etc.

解耦后电流变成了独立的dq直流分量，不仅在稳态时能够精确地跟踪电流指令，实现无静差，而且动态响应速度快。

The dismissed-coupling current becomes separate dq current component , it can accurately track the current without static error in steady state , but also has quickly dynamic respond performance .

仿真结果表明，单极调制单周控制APF能有效补偿非线性负载所导致的谐波和无功电流，补偿后电源电流中不含直流分量；

The simulative results show that the unipolar modulation APF with one-cycle control can compensate the harmonic and reactive currents caused by nonlinear load effectively and there is no DC off-set in the compensated source current .

将矩阵变换器输出线电压进行park变换得到d-q坐标下的直流分量，利用改进的模糊PID控制器跟踪控制输出给定电压的d，q分量。

The output line voltage of MC is converted into two direct current components under the d-q axis by Park transformation . These two components are controlled to track the d , q components of reference voltage by the modified fuzzy PID controller .

目前，商用的虹膜识别系统采用2DGabor滤波来提取虹膜纹理，但是Gabor滤波并不是严格意义上的带通滤波器，当带宽大于一倍频时，其偶对称滤波器会产生非零直流分量。

The commercial iris recognition systems use 2D Gabor filtering to extract iris texture presently . but it is not a band pass filter in the strict sense , once more than one octave bandwidth , the even-symmetric filter will have non-zero DC component .

1000kV交流断路器开断电流的直流分量时间常数和零偏现象

DC Component Time Constant and Zero Offset Phenomena of Breaking Current for 1000 kV Circuit Breaker

在单相PQC的仿真研究中发现电源电流易出现直流分量，而且系统没有实现全局稳定。

In the simulation study of single phase PQC , the dc offset current in source current can be observed and the global stability still has not realized .

在联合变换相关器中应用Haar小波滤波器进行模式识别，并利用参考物自相关谱抽取的方法来削弱零级直流分量。

In this paper , a Haar wavelet filter used in joint transform correlator is applied to optical pattern discrimination , and correlation spectrum subtraction of reference images is used to weaken the zero order dc diffracted .

由Josephson关系，得出DSC系统分别处于稳恒磁场和交变磁场时，两结间所加交变电压的直流分量改变，将导致系统的dcJosephson电流产生多次阶梯效应。

By the relation of Josephson , when the voltage between junctions of DSC system is changed and DSC system is in the constant magnetic field or various magnetic field , dc Josephson current of the DSC system has the effect of many steps .

EMTP仿真表明，该算法具有不受衰减直流分量和非整次谐波影响的特点，而且对高频暂态量也有很好的抑制作用。

EMTP simulation tests associated with a simple transmission system and 500 kV transmission system in Shandong power system show that the algorithms are of high speed with simple calculation , not influenced by DC decaying component , and high frequency components are effectively restrained .

还提出了基于稳健回归算法的直流分量辨识算法，以及基于Hilbert变换和非线性变量优化（NLO）的基波分量辨识算法，实现了同步电机瞬态和超瞬态参数的精确辨识。

In addition , this article presents a technique using robust regression algorithm to analysis the DC current component , as well as a new algorithm based on Hilbert and NLO for the analysis of fundamental current component , consequently , realizes accurate identification of transient and subtransient parameters .

逆变器输出电压直流分量产生原因与抑制方法

Reasons and Restraining Methods for DC Bias in Inverter Output Voltage

一种能滤除衰减直流分量的交流采样新算法

A novel alternating current sampling algorithm for filtering decaying direct current component