1) ship's harmonics and reactive power
舰船电力谐波与无功
4) reactive power and harmonics detection
无功与谐波检测
5) harmonic and reactive current
谐波和无功电流
1.
A method which detects and detaches harmonic and reactive current of three-phase system with digital signal processor (DSP) based on theory of instantaneous reactive power is presented in this paper.
根据瞬时无功功率理论,采用数字信号处理器(DSP)来检测和分离三相谐波和无功电流,并设计出系统硬件和软件,实验结果表明了该方案的可行性,展示了DSP芯片TMSC320C32的显著优势。
6) harmonic and reactive currents
谐波及无功电流
1.
Two main types of schemes are used in shunt Active Power Filters(APF)control:the conventional control scheme which is based on detecting and calculating the harmonic and reactive currents of nonlinear loads,and the direct ac main current control scheme which does not require the harmonic and reactive currents to be sensed and computed.
给出基于上述等效原理的APF新型控制方案,该方案是在传统方案基础上,省掉负载和APF电流检测单元以及谐波及无功电流或基波有功电流运算单元。
2.
A new equivalence principle of current control for shunt active power filters is introduced, which having no use for measurement of harmonic and reactive currents of nonlinear loads.
针对并联型有源滤波器提出了一种电流控制新方式,与传统控制方式不同,该方式不需要检测非线性负载中的谐波及无功电流。
3.
A single phase active filter is proposed based on compensating the electrified railway system harmonic and reactive currents.
研究应用于补偿电铁谐波及无功电流的单相有源滤波器,基于鉴相原理的谐波及无功电流检测法适合于作为电铁谐波及无功电流的检测方法,改进的三角波调制电流控制方法能对电铁系统中的谐波及无功电流起到很好的补偿作用。
补充资料:电力牵引高次谐波
电力牵引高次谐波
harmonics of electric traction
d Ionl一qlony旧gooe}x{ebo电j]牵引高次谐波(harmonies of eleetrietraction)整流式交流电力机车在整流过程中将引起交流侧电流、电压波形畸变,按傅立叶级数分析该畸变波形可分解成频率为基波频率整数倍的一系列高次谐波分量的叠加。 高次谐波电流、电压可引起下列不良影响: (1)对通信线产生杂音干扰影响; (2)引起电力系统中其他电力电容器设备的过负荷; (3)当电气化铁路负荷某次谐波电流频率与电力系统自身谐振频率相近时,可产生电流谐振,使该次谐波电流在电力系统中放大,危及电力系统安全运行; (4)使旋转电机、变压器、电力电缆的出力减少并产生过热,影响电气设备寿命; (5)造成继电保护误动或仪表读数误差; (6)使半导体开关元件换相失灵。 为限制谙波的危害,各国都规定了允许谐波含量的标准(见供电质童)。 为降低电力牵引负荷产生的谐波,在电力牵引变电所和电力机车中可装设由电容、电感组成的谐波吸收装置。交流一直流一交流电力机车利用电力电子技术,可实现低谐波分量的负荷特性,使谐波含量降低。
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