谐波分量

提出基于谐波分量Bode图集表示的三维谱图自动识别算法和振动故障瞬态诊断策略。

An automatic identification method and a strategy for fault diagnosis are discussed based on the waterfall diagram represented by the Bode diagram set of harmonic components .

由于PWM脉冲电压频率高、上升沿陡，含有较多的谐波分量，使传感器耦合出来的信号包含了很多干扰，导致局部放电信号的分析比工频正弦条件下更加困难。

Pulse-width modulation ( PWM ) pulses have fast rise-time , high frequency and many harmonic components which may be coupled as interference by PD sensor . Thus it is more difficult to extract PD signal under PWM condition than sinusoidal wave condition .

半波对称FFT算法针对半波对称性信号只含奇次谐波分量的特点，在算法流程中省去了偶次谐波分量部分。

The algorithm of half-wave symmetric FFT omits the even harmonics because the half-wave symmetric signals only have odd harmonics .

相对常见的方波PWM调制，显著降低了绕组电流的谐波分量，提高了运行的稳定性。

Compared with the square wave PWM modulation , this modulation significantly mend harmonic component of the winding current and improve the operational stability .

该文提出的整数N进小波变换和分数小波变换，可以提取信号的任何整数次和分数次谐波分量，具有比二进小波变换更强的信号处理能力和灵活性。

In this paper , both integer N wavelet transform and fractional wavelet transform are presented . Compared with dyadic wavelet transform , they possesses stronger abilities on signal processing and flexibility .

SPWM调制是提高逆变电源电压利用率和减少谐波分量的重要方法。

SPWM modulation is the important way to improve the invert power supply voltage efficiency and reduce the harmonic component .

研究结果：XLPE电缆的水树的劣化使得损耗电流中谐波分量增加。

Research results : Degradation of XLPE cable by water trees gives rise to harmonics in the loss current .

基于谐波分量法XLPE电缆水树老化测试系统的研究

Study on Measuring System of Water Tree in XLPE Cables Based on Measurement of Harmonic Distortion in Loss Current

LC型无源滤波器能滤除逆变器开关频率附近的谐波分量，但会引起系统振荡；

LC passive filter can filtrate the harmonic components whose frequencies near the switching frequency of the inverter , but power system oscillation may be caused .

由于直流供电电源纹波的影响，电压控制SPWM逆变电路的输出谐波分量幅值较大。

Because of the ripple of the DC power supply , the output harmonic amplitude of the voltage controlled SPWM inverter is higher .

解答由主部x0（只包含一个基波分量）和一、二阶修正量x1、x2（三次、五次谐波分量及基波分量的修正量）组成。

The solution is composed of the main oscillation x0 ( includes one resonant-frequency component only ) and 1st - , 2nd-order corrections x1 , x2 ( 3rd , 5th harmonics and correction of the fundamental-frequency component ) .

当直流供电电源电压大范围波动时，电压控制SPWM逆变电路的输出电压有幅值波动大、谐波分量大、动态响应较慢等缺点。

When the input voltage of DC power supply change randomly , the output voltage controlled by double-voltage SPWM will change too , and the dynamic response is slow .

为了正确辩识系统侧和用户侧在公共耦合节点（PCC）处所贡献的谐波分量，正确地认识公共耦合接点处的谐波，提出了一种新的谐波成份分析方法和改进的等效诺顿模型。

To identify the harmonic contribution of utility and customer on PCC correctly , this paper proposes a new decomposition way of harmonic component and an advanced Norton model .

对老化前后XLPE电缆测试表明：损耗电流谐波分量能够反映电缆水树老化程度的检测，且较为敏感。

The test results of before and after aged XLPE cables show that harmonic component in loss current was able to reflect the extent of water tree aged cable , and more sensitive .

同时PWM逆变器因死区的存在，在低速以及调制频率很高时，死区特性将会导致逆变器输出电压含有很大的谐波分量，使转矩发生很大的脉动，甚至可能导致系统不稳定。

In the case of low speed and high regulation frequency , the dead time characteristics of the PWM inverter may cause output voltage containing lots of harmonics , which introduces great ripples to its torque , and even makes the system unstable .

构建嵌入式操作系统uclinux并在此基础上生成嵌入式电网参数监测系统。该系统可以实时测量电网频率、三相电压、电流有效值和各次谐波分量。

Modified embedded system-uClinux and realize an embedded Power Parameter Monitor system which can measure the frequency , 3 phase voltage , current and harmonics and other parameters such as active power , reactive power etc.

针对非工频电源的频率测量问题，设计了基于Hanning窗的数字滤波器算法，有效地实现了在含谐波分量情况下非工频电源基波参数的提取。

Considering the problem of frequency measurement , designed a digital filter based on Hanning window , Realized the fundamental Parameter Extraction under the situation of containing harmonic component effectively .

从探针电流的二次谐波分量获得了电子能量的分布函数，研究了CO2激光器中N2、He、Xe等添加物对电子能量分布函数的影响，并给出了测量情况下的平均电子能量。

The distribution function of electron energy is obtained from the second harmonic component of the probe current . The influence of the additives N2 , He , Xe on the electron energy distribution in CO_2 laser mixtures are studied , and the average electron energy is obtained .

而变频启动装置由于采用可控硅（SCR）整流再逆变原理，其输出电压电流波形差，致使输出效率低、力矩小；另外，谐波分量大，不能满足国家相关标准要求。

Unfortunately , the SFC provides output voltage and current wave forms of a poor quality and consequently low torque and efficiency due to using Silicon Control Rectifier ( SCR ) for the converter design , which cannot meet the requirements of the relevant state standard .

对MOA交流伏安特性进行分析，发现随着电压升高，阻性电流谐波分量增长幅度明显比基波分量增长幅度大，但阻性电流基波分量增长稳定。

Through the analysis of MOA AC V-I characteristics , it is found that with voltage increasing , the harmonic contents of resistive current is increasing bigger than that of first-harmonic , and the increasing of the magnitude of first-harmonic is well-proportioned .

在互高阶累积量Yule-Walker基础上，首先将信号的特征空间分解为信号子空间与噪声子空间，再构建特征多项式，计算出各次谐波分量的幅值与频率。

Based on the cross-high-order cumulant Yule-Walker , first the feature space is decomposed as signal and noise subspace , then the characteristic polynomial is constructed , and the amplitude value and frequency of each order are calculated .

该方法应用一个多层前馈神经网络（MLFNN），对当前采样时刻和上一采样时刻的三相电流采样值进行分析计算，得出三相电流的谐波分量。

It analyses and calculates the three-phase current of current sample time and of the last by a multi-layer feedforward neural network ( MLFNN ), then the harmonic components of the three-phase current are got .

胎心音的主要频率范围集中在60~180Hz，因此在对信号进行A/D采样之前，应先设计滤波电路，滤除50Hz工频的谐波分量以及母体噪音。

The major frequency range of the fetal heart sound focus on 60 ~ 180 Hz . Before sampling the fetal heart sound , it is need to design filter circuit to percolate the syntonic of 50 Hz power frequency and the noise of the matrix .

一种基于滑动窗口的电量谐波分量递推算法

A recurrence algorithm for harmonics calculation based on a sliding window

该方法可以实现快速的检测出谐波分量，并补偿无功功率。

This method can inspect the harmonic component and reactive power immediately .

剔除非二次相位耦合的谐波分量。

And non - quadratic phase coupling harmonic components can be eliminated .

无线电引信自差机状态灵敏度与谐波分量的关系

Relationship fo state Sensitivity with Harmonic Components in the Radio Fuse Autodyne

利用谐波分量提高动态光谱法的信噪比

Increasing SNR of Dynamic Spectrum Method Using Harmonic Waves

谐波分量主要由于水树的非线性电压-电流特性引起。

Harmonic components arise as a result of nonlinear voltage-current characteristic of water trees .

优波功率变换中谐波分量的提取

The Method of Picking up the Harmonic Component in Wave Optimizing and Power Converting