本文设计了一种三相电压电流谐波监测系统。
In this paper, an intelligent instrument is introduced for measuring 3-phase voltage, current and Harmonic.
对两种情况下的输入电流谐波成分进行了动态分析。
In both cases, the harmonic content of the input current have been evaluated analytically.
对电流谐波进行理论分析和实验测量，二者结果吻合。
Theoretical analysis and experimental measurement for current harmonics, the results are agreement.
输入电流谐波含量高是多脉波二极管整流电路的一大缺点。
One of the problems of the most diode rectifiers is that they include large harmonic contents in its input current.
传统AC/DC变换器往往具有电流谐波高、网络功率因数低等缺点。
There are many disadvantages for the conventional AC/DC convert, such as higher current harmonic and lower power factor.
通过电路分析对电子镇流器存在的电源电流谐波高和功率因数低等问题。
In this paper has analysed high levels of harmonic currents and low Power factor of electronic ballast by circuit study.
SA4828的使用使整个系统结构简单，馈送电流谐波小，具有良好的应用前景。
By the use of SA4828, the system has the merits of simple configuration and low feedback current harmonic, which give it a good application prospect.
通过优化参数设置，可以使弧焊逆变电源的功率因数提高到95%，电流谐波畸变率低到30%。
Through the parameters optimization, the power factor (PF) can be increased to95%and Total Harmonics Distortion (THD) can be decreased to below30%.
而设计加入一个差模EMI滤波器以提升系统电路的功率因数并降低总电流谐波量以符合相关的规范。
The design of input differential-mode (DM) EMI filter for the reduction of total-harmonic-distortion (THD) for line current has been developed in considerations of practical design limitations.
另外，还对滤波器的结构和参数对输出直流电压脉动和发电机相电流波形的影响及相电流谐波进行了仿真分析。
In addition, the thesis analyzes the influence of the filter structure and parameters on the output DC voltage ripple and the shape of phase currents, as well as harmonics of phase currents.
理论分析和实验表明，基于双闭环重复控制的并网逆变器具有较高的输出电能质量和较低的并网电流谐波畸变率。
Theoretical analysis and experimental results verify that the dual closed loop repetitive control based inverter has high output energy quality and low THD of grid-connected current.
实验表明，作为双馈感应发电机转子励磁电源的三相pwm变换器具有功率因数高、网侧电流谐波小、能量双向流等优点。
Experimental results show that three-phase PWM converters are advantageous in high power factor, small input-line current harmonic distortion and bi-directional power flow.
针对多重化的背靠背四象限变流器，采用了载波移相控制与改进的SPWM调制相结合的方法，减小了电流谐波，提高了功率交换能力。
For multiple back-to-back four-quadrant converter, a modified SPWM technique is combined with carrier phase-shifting control, which reduces current harmonic and enhances power exchange ability.
本发明所设计的波形变换方法及其装置，省去了中间直流环节，使线路得以大大简化，显著降低了成本，同时使电压、电流谐波得以减小，并可获得较高的功率因数。
The present invention has no intermediate DC link and thus simplified circuit, low cost, less harmonic component in the voltage anc current waveform and high power factor.
本文介绍了常用的几种谐波和无功电流检测方法，并进行了比较。
Several methods of measuring harmonic and reactive power current are introduced and compared in this paper.
电力变流器和其他非线性负荷向电力系统“注入”谐波电流，引起一系列问题。
The power converters and other nonlinear loads "inject" the harmonic current into the power systems and cause a series of problems.
该文提出了基于瞬时无功功率理论的四相输电谐波电流检测方法。
This paper presents four-phase transmission harmonic current detecting method based on instantaneous reactive power theory.
减小这种影响的一个办法是，将由电力电子负载产生的谐波电流或者电磁干扰滤除。
One approach to minimize this impact is to filter the harmonic currents and the electromagnetic interference(EMI) produced by the power electronic loads.
本文推导出电流源逆变器(CSI)脉宽调制(PWM)谐波电流幅值表达式，脉动转矩目标函数。
A formula of harmonic current amplitude for CSI PWM is derived in this paper. An objective function of pulsating torque is also derived.
消除转矩脉动可以通过对定子电流加入谐波的方式完成。
A pulsating torque component can be compensated by inject a selected harmonic component to the phase current.
减少了变频器输入电流中包含的高次谐波成份的输出。
It reduces the high hypo syntony wave output part included in the converted input current.
基于自适应噪声对消技术及人工神经网络(ANN)理论，提出了一种谐波电流动态检测方法。
Based on self adaptive noise countervailing method and artificial neural network (ANN) theory, this paper proposes a new approach to the dynamic detecting harmonics.
保证过电流保护的同时，还提高了开关频率，减小了输出谐波。
The switch frequency is increased and the output harmonic is decreased while the overcurrent protection is ensured.
提出了一种新型三相逆变器输出滤波器，它能有效地减少输出电压和电流中的开关谐波分量。
A new inverter output filter is presented. It can reduce efficiently the output voltage and current switching harmonic.
提出了一种新型的有源电力滤波器电流检测和控制方法，在补偿谐波电流的同时还可以进行无功补偿。
A method of current detect and control for the new active power filter (APF) is presented, which has the ability of canceling harmonic and compensating reactive power at the same time.
计量误差考虑了电度表电压线圈和电流线圈在不同的谐波次数以及谐波大小时的非线性效应。
The metering error considers the non linear effect of the voltage coil and current coil in watt hour meter under different order of harmonics and different distortion degree of input waveform.
该算法可以滤去短路电流中的交流谐波分量，得到直流电流变化率的准确结果。
By this algorithm, the ac harmonic components of short-circuit current can be filtered, and the accurate DC current rate of change can be obtained.
该算法可以滤去短路电流中的交流谐波分量，得到直流电流变化率的准确结果。
By this algorithm, the ac harmonic components of short-circuit current can be filtered, and the accurate DC current rate of change can be obtained.
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