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load harmonics
相关语句
  负荷谐波
     Distribution Calculation of Electric Traction Load Harmonics in Three Phase Power System Algorithm, Programming and Example
     电牵引负荷谐波在三相电力系统中的分布计算——算法、程序设计与算例
短句来源
     Load Harmonics Analysis & Simulation of Different Work Conditions Based on Locomotives
     基于电力机车不同工况的负荷谐波分析与仿真
短句来源
     The necessity of harmonic distribution calculation is discussed,and it is proposed that the three phase analysis method be used for the distribution calculation of electric traction load harmonics in the power system.
     讨论了谐波分布计算的必要性,指出电牵引负荷谐波在电力系统中的分布计算宜采用三相分析法。
短句来源
     Using the proposed algorithm the complicated harmonic current calculation is avoided, the computing speed is quickened, so the frequently varying load harmonics can be traced and compensated.
     该算法避免了复杂的谐波电流计算,提高了运算速度,能够跟踪并补偿频繁变化的负荷谐波
短句来源
  “load harmonics”译为未确定词的双语例句
     Non-linear Load Harmonics and Research on Harmonic Suppression Technology
     非线性电力负荷的谐波与抑制技术研究
短句来源
     This thesis also carries digital simulations of AC-DC-AC locomotives with actual parameter of locomotive using MATLAB/Simulink. The load harmonics characteristics of AC-DC-AC locomotives are presented, whichwill be helpful for the development of feeder protection relays of traction power system with AC-DC-AC locomotives.
     论文还根据交—直—交型机车的实际参数,运用MATLAB/Simulink对交—直—交型机车进行了数学仿真研究,阐释了其负荷工况和谐波特点,为运行交—直—交型机车的牵引供电系统馈线保护发展做了有益的基础工作。
短句来源
     This paper introduces technical features of power equipment, reactive load, harmonics harmful to power network and its preventive measures and techniques in metallurgical enterprises. The paper also compares functions and actual benefits of different reactive compensation and wave filtering devices.
     介绍了冶金企业用电设备的工艺特点,用电负荷无功、谐波对电网危害的防治措施和技术,以及主要无功补偿滤波装置的性能比较和实际效益。
短句来源
     This paper focus on discussions of the effectiveness of SVCs on the compensation of three kinds of special cases in detail: voltage fluctuation and sags caused by long distance distribution to large motor load, harmonics and voltage fluctuation caused by traction load of subways and flickers caused by electric arc furnaces.
     文章详细分析静止无功补偿装置(SVC)对下述3种特殊情况的补偿效果:长距离向大型电动机负荷供电引起的电压跌落和波动、地铁牵引负荷引起的谐波和电压波动及电弧炉引起的闪变。
短句来源
     Its control system of both AC side and DC side was designed. Simulation and experiment results indicate that the shunt active power filter with STS-SVM based cascade multilevel converters, which is of fast dynamic response, can compensate load harmonics and passive power precisely and efficiently at lower switch frequency.
     仿真和实验结果表明,基于错时采样空间矢量调制级联型多电平变流器的并联有源滤波器可以在较低的开关频率下准确、有效地补偿负载谐波和无功功率。
短句来源
  相似匹配句对
     Studying of the Reactive Compensation Capacitor Harmonics Over-load
     无功补偿电容器谐波过载问题的研究
短句来源
     On Segregational Load
     论单基因的分离负荷
短句来源
     ELECTRONIC LOAD
     电子负载的研制
短句来源
     HARMONICS AND ELIMINATION
     谐波与抑制
短句来源
     Non-linear Load Harmonics and Research on Harmonic Suppression Technology
     非线性电力负荷的谐波与抑制技术研究
短句来源
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This paper deals with the aeroacoustic nature of unequally spaced fan. The noise radia-tion formula of unequally spaeed fan in far field is derived in terms of S. E. Wright's BLH(BLade Loading Harmonics)theory, and the formula of equally spaced fan is its special case.It is found that uneven blade spacing can modulate btade passage frequency and its harmonicsfrom the formula, which further shows the redason for the reduction of fan noise by means ofuneven blade spacing. Compared with the noise values of...

This paper deals with the aeroacoustic nature of unequally spaced fan. The noise radia-tion formula of unequally spaeed fan in far field is derived in terms of S. E. Wright's BLH(BLade Loading Harmonics)theory, and the formula of equally spaced fan is its special case.It is found that uneven blade spacing can modulate btade passage frequency and its harmonicsfrom the formula, which further shows the redason for the reduction of fan noise by means ofuneven blade spacing. Compared with the noise values of the B.P.F. and its harmonics of-equally spaced fan, the reduced noise values of the B.P.F.and its harmoics of unequally spacedfan can be predicted according to the formula, and the values are basically in agreementwith the measured data. The experiment shows that to a large extent the change of bladespacing will not deteriorate the aerodynamic performance of the fan, therefore the optimumdistribution method of the blade spacing can be selected flexibly ( this paper recommendsthe relative ratio of the blade spacing of unequalg spaced fan to that of equally spaced fanshould not exceed 20 Per cent) .

本文根据S.E.Wright的BLH理论,导出了不等节距风机的声辐射公式,而等节距叶片风机声辐射公式是该公式的特殊情况。同时,从公式中可以看到不等节距叶片对风机通过频率及其谐波具有调制作用,这从理论上进一步阐明了不等节距叶片分布能降低噪声的原因。在公式中,还能预测出与等节距相比时叶片通过频率及其谐波所对应的噪声变化值,其计算值与试验值基本一致。试验表明,不等节距与等节距的相对变化率在较大范围内(本文推荐其变化率不超过20%)不会对风机气动性能产生大的影响,因此,可以灵活地选择叶片节距的最佳分布方式。

This paper presents a new principle to detect the ground fault in the neutral point indirectly grounded power system.An energy function consisted by post fault Zero Sequence voltage and current is come up. Thus,according the direction and magnitude of the energy function,the fault line can be detected.The principle is not influenced by load harmonics and the transient process.EMTP simulation results confirmed that the conclusions of this paper is right.The application of the new principle is also discussed...

This paper presents a new principle to detect the ground fault in the neutral point indirectly grounded power system.An energy function consisted by post fault Zero Sequence voltage and current is come up. Thus,according the direction and magnitude of the energy function,the fault line can be detected.The principle is not influenced by load harmonics and the transient process.EMTP simulation results confirmed that the conclusions of this paper is right.The application of the new principle is also discussed in the digital fault line detection scheme.

本文提出了一种小电流接地选线的新原理,利用接地后零序电流和电压构成能量函数,由能量函数的方向和大小判别接地线路.该原理适用于经消弧线圈接地系统,并且不受负荷谐波源和暂态过程的影响,从而在理论上解决了传统方法选线准确率低的问题.EMTP仿真计算结果表明本文的结论是正确的.本文还对能量法接地选线原理在数字式接地选线装置中的应用进行了研究.

The power harmonics generated by the cycloconverter in an a.c.excited generation system can be grouped into two sorts:“Load Harmonics” and “Source Harmonics”.In this paper,the natures of these two kinds of different harmonics was analyzed and the detecting methods of voltage datum for the source harmonics were discussed.The optimized topologic structure of hybrid filter was proposed,and finally,the experimental results were given to verify the study.

由交交变频器输出作为交流励磁的发电系统中,输出电力谐波可分为两类:“负载谐波”与“电源谐波”。本文分析了这两类谐波的特性,讨论了电源谐波的检测方法,提出了优化的混合式滤波器结构,对设计中的特殊问题作了详细分析,最后给出了实验结果作为本研究的验证。

 
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