现有两个准则可用来评价谐波畸变。
There are now two criteria that are used to evaluate harmonic distortion.
这种作用就称为谐波畸变。
这种偏离完全正弦的畸变称为电压、电流波形的谐波畸变。
This deviation from perfect sinusoids is usually expressed in terms of harmonics distortion of the voltage and current waveforms.
针对这一问题，该文提出了谐波畸变情况下配电网络优化运行的概念和模型。
To handle this problem, the concept and mathematical model of distribution network optimal operation are proposed in this paper, and a genetic algorithm based solving program is developed.
通常，它是紧紧，干净，明确表达听起来耳机有少量谐波畸变产品的我们的经验。
Generally, it is our experience that tight, clean, articulate-sounding headphones have few harmonic distortion products.
为提高逆变电源的功率因数，必须采用谐波抑制技术降低输入电流的谐波畸变率。
To increase power factor, the current distortion can be reduced by harmonic suppression technology.
实验结果表明该原理样机能将功率因数提高到0.99以上，总谐波畸变小于7%。
The experimental results verify that the prototype can make the power factor reach over 0.99, and make total harmonic distortion reach lower than 7%.
给出了输入功率因数、畸变因子、峰值系数、总谐波畸变率和谐波分量的实验结果。
The experiment results show input power factor, distortion factor, crest factor, total harmonic distortion and harmonic components.
通过计算，选择符合电压谐波畸变标准的交流滤波器，并进行各元件的稳态额定值的计算。
Through the calculation, the filters have been selected corresponding with voltage harmonic distortion standard. And the steady state rating of the parameters are calculated.
谐波畸变特性是遥测地震数据采集系统的一项重要性能指标，直接影响地震数据采集的质量。
The Harmonious Distortion characteristic of telemetry seismic data acquisition systems is an important performance index, which affects the quality of seismic acquisition data directly.
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%.
着重分析了智能建筑中引发谐波畸变的各类扰动源，并针对谐波畸变的危害，提出相应的防范措施。
This paper mainly discusses disturbance sources which cause harmonic variance and gives some means of protection against harmful harmonic variance.
通过实验结果表明，单级功率因数校正装置可以实现较高的功率因数、较低的总谐波畸变，而且输出电压纹波小。
Experiment results showed that the correction device of power factor could realize high power factor, low harmonic distortion and low ripple of output voltage.
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.
在整周期采样的FFT算法的基础上，提出了确定基波周期的总谐波畸变(THD)最小的方法，并作了误差分析。
Based on the integer period sample FFT algorithm, a lowest total harmonic distortion (THD) method for determining the base period is proposed in this paper, and the derivation is theoretically given.
该样机在实验中测得输入电流总谐波畸变率（THD）为4.26%，功率因数为0.998，达到了预期的设计效果。
Themeasured input current THD is 4.26%. Power Factor attains 0.998. Theprototype realizes the expectation.
由于震源的机械装置和振动装置的非线性振动以及振板与大地的耦合等问题，在震源向地下输入能量的同时，也产生了谐波畸变。
Harmonic distortion arises from the nonlinear vibrations of mechanical device of seismic source and the coupling between the vibrator and the ground.
该方案能在80 ~ 265V宽输入电压范围内得到稳定直流电压输出，具有效率高、总谐波畸变率低、功率因数接近为1等特点。
It can achieve a fixed output of DC voltage in the universal input range of ac 80 ~ 265 V. It owns the advantages of high efficiency, low total harmonic distortion, PF near to 1.
实验结果表明，应用该电路拓扑的实验装置，其功率因数较高，输入电流的总谐波畸变较低，输出电压纹波小，而且整个装置的效率也比较高。
Experiment result showed, the topology can make the device get to high Power Factor (PF), low Total Harmonic Distortion (THD) of input current, low ripple of output voltage, and high efficiency.
在这种新的逆变器开关控制策略中建立多目标优化函数，既使得电压型逆变电路输出电流波形总谐波畸变率尽量小，同时又能减小逆变过程的电力电子开关损耗。
In this control law multi-object function is created, which enables a voltage-source type inverter to produce a near standard sine wave with a minimum switching loss.
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。
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.
并联型有源电力滤波器适用于多种负载条件下的谐波和无功补偿，尤其是能应用于电源电流畸变和不平衡条件下。
The SAPF prototype can compensate harmonics and reactive well under varies load conditions, especially in the case of a distorted or unbalanced current of power supply.
有限振幅的超声波在固体中传播时会发生波形畸变，伴随着高次谐波的出现。
Wave distortion will occur when finite amplitude ultrasonic waves propagate in elastic solids, resulting in the production of higher order harmonics.
本文仿真分析了CVT的谐波丈量畸变原理，并对其稳态电路进行了主要元件参数的灵敏度分析。
Simulation of the CVT's harmonic measurement distortion, and analyze the sensitivity of the main components parameters use of the steady-state circuit were conducted in the thesis.
这里须滤去由电抗器相位控制引起的谐波电流以避免不能接受的输电母线电压畸变。
These may be required where harmonic currents caused by the thyristor phase control of the reactor current must be filtered to prevent unacceptable transmission bus voltage distortion.
用于整流的电力电子器件会产生谐波，造成接触网电流畸变。
But rectifier type power electronic components may produce harmonic current and make contact grid's current distorting.
从开关利用率的角度，为不同负载电流畸变率情况下选取何种电路进行谐波补偿，提供了理论依据。
From the view of switch utilization ratio, the theory gist is given for employing which circuit in condition with different total harmonic distortion of load current to correct harmonic current.
电力系统的谐波是电力系统电压正弦波形产生畸变，电力机车用电会产生0次到50次谐波。
The power system harmonic is the voltage sine wave of power system get distortion; electric locomotive power will have 0 to 50 harmonics.
对样机空载电势波形的谐波分析表明，齿谐波电势分量很大，导致空载电势波形的畸变率较大、波形较差。
Harmonic analysis shows that tooth harmonic components of no-load EMF waveform is considerable high, which give rise to high distortion and bad waveform.
对样机空载电势波形的谐波分析表明，齿谐波电势分量很大，导致空载电势波形的畸变率较大、波形较差。
Harmonic analysis shows that tooth harmonic components of no-load EMF waveform is considerable high, which give rise to high distortion and bad waveform.
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