The harmonic problems, such as distorting supply voltage, decreasing power factor, increasing energy loss, interfering with communication systems etc. are discussed in the part one.
第一部分讨论各种谐波问题，如使供电电压畸变，降低功率因数，增加能量损耗，干扰通讯系统等。
Active power Filter (APF) technology is one of the important ways to realize harmonic wave compensation of electrical network and improve the quality of power supply.
有源电力滤波器(简称APF)技术是一种实现电网谐波补偿、改善供电质量的重要方法。
Because of the severe pollution of electrical network harmonic, the harmonic restrain has become an important task of power supply bureau.
由于电网谐波污染严重，对谐波的抑制已成为供电部门的重要任务。
Harmonic problems have become the important factor that affects the quality of power supply.
谐波电流污染已经成为影响供电质量的重要问题。
Because of the ripple of the DC power supply, the output harmonic amplitude of the voltage controlled SPWM inverter is higher.
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。
Through reason and harm analysis which produces to the rail transit power supply system higher harmonic, discusses emphatically to the power supply system harmonic suppression measure.
通过对轨道交通供电系统高次谐波产生原因及危害的分析，着重探讨对供电系统谐波抑制的措施。
Power Supply System is often placed with shunt compensation capacitors and the upper harmonic waves in the distribution network have much influence on the capacity.
供配电系统通常接有并联补偿电容器，配电网中的高次谐波对电容的影响很大。
Harmonic in power supply system is serious problem.
电网中谐波问题日益严重。
It can verify the switching power supply based on PWM rectifier to be able to suppress harmonic and improve power factor.
从而验证基于PWM整流器的开关电源有抑制谐波和提高功率因数方面的优越性。
So harmonic current should be suppressed firstly rather than harmonic voltage. The harmonic characteristic on the network side and the ac side of medium-frequency power supply is analyzed.
分析了电网侧和中频电源交流侧的谐波特性，并针对中频电源提出了几种谐波抑制措施。
It covers five aspects: supply voltage tolerance, utility harmonic, three-phase voltage unbalance, power system frequency tolerance, voltage fluctuation and flicker.
它涵盖五个方面：供电电压允许偏差、公用电网谐波、三相电压不平衡度、电力系统频率允许偏差、电压允许波动和闪变。
In order to restrain harmonic pollution and improve power system quality, power factor correction (PFC) circuit is applied in pre-stage of power supply.
为了抑制谐波污染，改善电网品质，目前多在电源前级加入功率因数校正环节。
Using the VI program to measure the harmonic of switching power supply.
利用该VI程序测量开关电源输出量的谐波；
Phaseshifting reactor is a new method for converter power supply systems harmonic suppression.
移相电抗器是变流器供电系统谐波抑制的一种新方法。
Based on the differences of harmonic testing point, there are two control ways for shunt active filters, that is, the way of load current sensing and the way of power supply current sensing.
并联型有源滤波器根据其谐波检测点的不同，有两种控制方法。即负载电流检测控制方法和电源电流检测控制方法。
We have studied the method of eliminating the harmonic wave of SCR regulating-speed device a servosystem and increasing its power supply unit' s loading ability when its current is large.
研究了随动系统中SCR调速装置在大电流时，消除其谐波并使供电装置负载能力提高的方法；
At last, harmonic suppression methods of converter power supply systems are discussed.
最后，论述了变流器供电系统的谐波抑制方法。
So it become the target of power supply department and user to monitor the harmonic of the power net.
因此，对电网谐波含量进行监测，并把它控制在允许范围内，成为供电部门和用户的共同目标。
SPWM modulation is the important way to improve the invert power supply voltage efficiency and reduce the harmonic component.
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。
Abstract: : Harmonic is caused power loss increase, important factors in the decline in the quality of power supply.
摘罍要：谐波是导致电力损耗增加，供电质量下降的重要因素。
Surge suppressor and low-order harmonic filter can improve power supply quality.
利用浪涌抑制器和低次谐波滤波装置，可有效改善供电质量。
However, because of its nonlinear characteristics, the switching power supply resulting input current contains a large number of odd harmonics, which cause serious harmonic pollution for the grid.
然而由于其非线性的特性，导致其输入电流中含有大量奇次谐波，对电网造成了严重的谐波污染。
In recent years, harmonic pollution issues gradually become the focus of attention in power supply network.
近年，供电网谐波污染问题逐步成为关注的焦点。
Electrified railway negative sequence and the harmonic seriously affected grid power quality, reduced the reliability of power supply.
电气化铁路产生的负序、谐波严重地影响了电网电能质量，降低了电网供电的可靠性。
Test results proved that the motor had lower current harmonic, more efficient use of DC supply voltage than SPWM, less switch loss of power switch.
实验结果证明，系统电动机电流的谐波失真较小，直流母线电压利用率比常规的正弦波脉宽调制（SPWM）有了较大的提高，功率器件的开关损耗较小。
On the basis of Longkou Mining Group mine harmonic pollution, and harmonic pollution to electric network power equipment and power supply into the effect and harm.
本文根据龙矿集团矿区电网谐波污染状况，及谐波污染给矿区电网供用电设备和供电电能质量带来的影响和危害。
The harmonic affects the safe operation and economic benefit of power supply enterprises to great extent.
谐波给供电企业的安全运行和经济效益带来了巨大影响。
Describes the harmonic current in the factory power supply system and how to calculate it, and on top of that, analyses active filtration of electric power.
简要介绍了工厂供电系统中的谐波电流及其计算方法，并在此基础上分析了电力有源滤波器的原理及谐波电流的抑制。
Describes the harmonic current in the factory power supply system and how to calculate it, and on top of that, analyses active filtration of electric power.
简要介绍了工厂供电系统中的谐波电流及其计算方法，并在此基础上分析了电力有源滤波器的原理及谐波电流的抑制。
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