高次谐波

本文提出的角度PWM方法着眼于电机的定子电压空间矢量，使其矢量角均匀变化，减小电压波形中的高次谐波分量。

The presented phase angle PWM method is centering attention on motor stator voltage space vector and controls the vector angle to vary linearly and so reduces higher harmonics in voltage wave .

分析推导了非整周期采样时FFT泄漏误差的解析估计公式，得出了在输入信号含基波和高次谐波分量的情况下，利用FFT迭代计算来实现自适应整周期采样的一种新算法。

An Analytic estimative formula of FFT leakage error for non-integral period sampling is analyzed and derived and in the case of the input signal including fundamental wave and higher harmonics , a new calculating method of realizing the self-adaptive Integral period sampling with FFT iterative calculation is obtained .

强激光场中N2分子高次谐波干涉效应的理论研究

Theoretical Study on the Interference Effects in High-order Harmonic Generation from N_2 Molecules in Intense Laser Fields

对于波动性较大的负荷，Fourier算法用于滤除高次谐波分量。

Fourier algorithm is used to get rid of the high frequency harmonics .

在强场中产生相干高次谐波的真空紫外～软X射线源的进展评述

A Review on Advance of Coherent High-order Harmonic Generation in Strong Fields for VUV ~ Soft X-rays Source

7fs超快强激光驱动Ar原子产生支持单个阿秒脉冲的高次谐波连续谱

Generation of High-Order Harmonic Continuum Supporting Single Attosecond Pulse in Argon Driven by Intense 7 fs Laser Pulse

设计出能有效消除APF产生的高次谐波的高通滤波器。

The high-pass filters were designed to eliminate effectively the highfrequency harmonics produced by APF .

高次谐波产生的电磁噪声是当前高性能PWM逆变器存在的主要问题之一。

Electromagnetic noise caused by high harmonics still is the main problem of high performance pulse width modulation ( PWM ) inverter .

通过选取合适的子平台进行频率叠加，在消除了离子的高次谐波的影响后，可以获得单个的阿秒软X射线脉冲。

The superposition of an appropriate sub-plateau can give single attosecond soft X-ray pulse , and the effect of HHG from ion has been eliminated through the band selection .

SRD超高次谐波混频器的分析

An analysis of SRD super high order harmonic mixer

建立了激光与原子相互作用的伪分立态模型，并用此模型计算了激光场中H原子的多光子电离速率和高次谐波。

A pseudo discrete state approximation is developed . The multi photon ionization rates and the high harmonics of a hydrogen in the laser fields are computed by using this approach .

HPF（高通滤波器）检测高次谐波和无功电流改进方法的研究

Study on Rectified Method of Detecting High-order Harmonics and Reactive Current Based on HPF

TEACO2激光脉冲整形技术是高功率、高重复率、捷变频的TEACO2激光器研究和用TEACO2激光产生倍频、高次谐波技术的必不可少的重要技术。

The pulse shaping technique for TEA CO 2 laser is one of the most important techniques to study high power and high repetition rate tunable TEA CO 2 laser and its frequency conversion .

通过计算机MATLAB仿真，该方法能很好地检测农村电网中的高次谐波及无功电流，为农网安全、可靠和经济运行提供了保障。

Through MATLAB simulation , the method can check the high order harmonics and reactive current in the agricultural network , thus can guarantee the safe , reliable and economical operation of the agricultural power network .

作者采用加窗插值FFT，并提出逐幅谐波消去法，以便能精确地分析高次谐波。

So , the windows and interpolated FFT is developed , and the harmonic expurgation according to amplitude is put forward for high order harmonic parameters analysis in this paper .

实验表明，气体的压强和气体盒与激光焦斑的相对位置都会对CO2分子的高次谐波产生影响。最后，对全文的研究内容作了总结。

The experiment results show that gas pressures and the position of gas cell have great influences on HHG from CO2 . Finally , the dissertation sums up all of the research work .

PWM调制技术已广泛应用于电力电子技术中，但PWM调制信号含有大量的高次谐波，成为产生EMI的主要原因之一。

Though PWM modulation technology has already been used in power converter abroad , it becomes a main reason which can produces EMI because PWM modulation signal contains abundant high harmonic .

此外，由于所设计的Hilbert数字移相滤波器具有优越的频率响应特性，即使对于相当高次谐波无功功率的测量，也能获得很高的测量准确度。

In addition , because of the excellent frequency response of the designed Hilbert filter , the high accuracy of the measurement for high harmonics can be guaranteed .

为了减少PWM整流器开关频率附近高次谐波的含量，文中采用了三次LCL型滤波器。

To reduce the current harmonics around switching frequency of the three-phase pulse width modulation ( PWM ) rectifiers , an LCL filter has been adopted .

实验表明，该谱仪有足够的灵敏度参与超短强激光脉冲辐照气体靶的软X射线产生、X射线激光乃至高次谐波实验的软X射线光谱诊断工作。

The results show that the spectrograph is a powerful tool of spectral diagnosis in experiments on the ultrashort pulsed laser gas puff target interaction , optical field ionization soft X ray laser , and high harmonic generation .

ALF低通滤波电路将高次谐波滤除，防止了混叠效应的发生。

ALF low-pass filter circuit is used to filter out high frequency harmonics , preventing the occurrence of aliasing effects .

实验结果表明，采用混沌PWM调制可以有效抑制逆变器输出电压的高次谐波幅值，并且概率分布不同的2种混沌信号对PWM逆变器输出频谱的影响差别不大。

Experimental results show that the chaotic PWM can restrain the amplitude of the higher harmonic , and especially , chaotic signals with different probability density almost have the same affection on the output spectrum .

电弧炉正常工作时产生大量高次谐波，APF即利用可控的功率半导体器件向电网注入与谐波源电流幅值相等、相位相反的电流，使电源的总谐波电流为零，达到实时补偿谐波电流的目的。

A large number of EAF generated high-order harmonic , APF inject to grid with amplitude equal and the opposite phase current harmonic the power with controllable power semiconductor devices .

逆变器采用混沌PWM（Pulsewidthmodulation）调制能够有效抑制开关频率及其倍频附近的高次谐波幅值，从而大大减少逆变器驱动电机的电磁干扰。

Chaotic pulse width modulation ( PWM ) results in the reduction of the amplitude of harmonic in the switching frequencies , with advantageous effect on the suppression of the acoustic noise concentrated at specific tones in an inverter-driven electric machine .

由于DLP伽马非线性的存在，变形条纹中会出现高次谐波，可能导致频谱混叠，带来测量误差。

However , the gamma nonlinearity of DLP introduces specific higher-order harmonics , which perhaps leads to appearance of spectrum aliasing , and error of measurement .

为抑制高次谐波采用LCL滤波器，对LCL滤波器的数学模型与设计原理进行了研究。

Further , the LCL filter was employed to suppress high harmonic . The mathematical model and design principles of the LCL filter were studied .

利用数字锁相放大器探测了甲烷气体位于6105.3694cm-1处的弱吸收线的高次谐波，并通过计算机实现了对数字锁相放大器的远程控制，用VISUALBASIC6.0编制了一套通信应用程序，界面友好。

The harmonic detection of methane at 6 105.369 4 cm - 1 was measured by use of a digital lock-in amplifier ( SR830 ) remotely controlled by a computer . The programme was written by Visual Basic 6.0 because it has strong function and a friendly appearance .

经过综合比较，最终确定了使用单级LC滤波器，并提出选取谐振频率ω0要以所要输出的电力系统最高次谐波为参考的设计依据。

By comprehensive consideration , the single stage LC filter is selected and the theoretic base is confirmed that the resonance frequency ω 0 must exceed the highest order harmonics ' frequency in the electric power harmonics .

以及将DGS结构用于微波功率放大器设计中，主要用于高次谐波抑制，以提高微波功率放大器的性能指标。

DGS structure has also been used in microwave power amplifier design , mainly in high order harmonic suppression in order to improve performance index of microwave power amplifier .

本文讨论用微型计算机提取直流、非周期、二次、四次及以上高次谐波分量的IIR数字滤波算法。

This paper deals with the IIR ( infinite impulse-response ) digital filtering algorithm we adopted to extract the components of direct curren-t , non-periodic , and 2nd and 4th harmonics with microcomputers .