In unbalanced systems,three-phase input current track the non-zero sequence phase voltages.
当三相电网不对称时,三相输入电流跟踪电网电压的非零序分量,采用传统电网电压选择矢量区间不能保证三相PWM整流器具有较低的开关损耗,且在电网极端缺相故障时,系统不能正常工作。
Effects of water trees on insulation resistance and DC component of XLPE cable;
水树对XLPE电缆绝缘电阻与直流分量的影响
It includes two parts: (A) the transient recovery voltages after circuit breakers interrupt the short-circuit currents or the current is out of phase condition;(B) the time constant of DC component of short-circuit currents and current-zero offset.
结合1000kV特高压试验示范工程及规划的中国特高压电网,研究了交流1100kV断路器瞬态问题中的短路电流直流分量衰减时间常数及交流电流过零点的漂移现象,在此基础上提出了我国交流1100kV特高压断路器的工作条件建议,如特髙压断路器试验的短路电流直流分量衰减的时间常数等。
In the light of the DC components existing in active filters(APFs) based on one-cycle control(OCC), the OCC and its various improvement approaches are presented.
针对基于单周控制的有源电力滤波器存在的直流分量问题,介绍了单周控制及其各种改进方法,说明了引入纹波法、双环控制、双向互补策略、单极调制和双边积分控制在单相有源电力滤波器中的应用情况,并根据级数收敛判据对上述单周控制策略的稳定性进行分析比较。
A new algorithm for blind watermarking based on DC components of DCT;
一种基于DCT域直流分量的盲水印算法
The algorithm selects adaptively the embedding intensity to embed the watermark bits by modifying some AC components and DC components via the human visual system model and local characteristics of image,synthetically making use of the advantage of the AC components and DC components.
该算法利用视觉系统HVS特性和图像的局部特点,自适应地选择嵌入强度对载体图像各个分块的部分低频系数和直流系数嵌入水印,综合了交流分量和直流分量的嵌入优势,使水印的稳健性和不可见性达到较好的平衡。
The analysis of the whole region stability condition and the mechanism of the DC off-set in the compensated current of the system is proposed.
分析了系统的全局稳定条件和补偿后电流中直流分量的产生机理,研究了系统带不平衡负载和动、稳态补偿性能以及稳定性。
There are DC off-sets in the compensated source current of the APF with one-cycle control under bipolar modulation.
采用双极调制方式单周控制APF补偿后的电源电流中存在直流分量。
There are DC off-sets in the compensated source current of the traditional APF with one-cycle control due to the existent ripple and the peak current detection.
传统的单周期控制有源电力滤波器以峰值电流检测的控制方式和纹波电流的存在导致补偿后的电源电流中含有直流分量。
DC component in the vision signal
图像信号的直流分量
DC Component Time Constant and Zero Offset Phenomena of Breaking Current for 1000 kV Circuit Breaker
1000kV交流断路器开断电流的直流分量时间常数和零偏现象
The half?wave Fourier algorithm was derived by the sampling signal without decaying DC component, and cannot filtrate the component.
半波傅氏算法是基于采样信号不含衰减直流分量而推导出来的,对衰减直流分量的滤除不明显。
DC current or voltage source. Magnitude of AC component can be specified.
直流电流源或电压源。可指定交流分量的大小。
Best Measurement Position Analysis of Single and Straight Tube Coriolis Mass Flowmeter
直管式科氏质量流量计最佳测量点分析
Transformer Coil DC Resistance Test and its Result Analysis
变压器线圈直流电阻测量及结果分析
Location Factors Analyses of the Choice of Foreign Direct Investment Flux and Flow Direction
对外直接投资流量流向选择的区位因素分析
Interruptions to and alternating component (ripple) in d.c. auxiliary energizing quantity of measuring relays
GB/T8367-1987量度继电器直流辅助激励量的中断与交流分量(纹波)
DC ammeter with shunt
带分流器的直流电流表
So measuring the mass flow of the multi-component gas has been an intractable problem in flow measurement field.
所以说多组分或变组分气体的质量流量测量一直是流量测量领域中的一个难题。
Effect of flow pulsations on performance of straight tube coriolis mass flow meter
流体脉动对直管科氏流量计测量性能的影响分析
Read horizontally to flow rate curve and vertically downward to flow rate gpm.
读出水平线上的流量曲线和垂直线下方的的流量（加仑/分钟）。
Small diameter and little awl corner hydrocyclone has better separate, lower work capacity, large pressure drop and diffluence ratio.
小直径小锥角水力旋流器分离粒度小、处理量小、压降大、分流比大;
Non-DC application of rectification type magnetoelectric meter and its limitation analysis
磁电系整流式仪表在非直流测量中的应用及局限性分析
Calculation on Flow Rate Distribution and Wall Temperature of Waterwall with Spiral Tube Coils of Supercritical Once-through Boilers
超临界直流锅炉螺旋管圈水冷壁流量分配及壁温计算
Design Theory and Sensitive Character Analysis of the Straight Tube Coriolis Mass Flowmeter
直管科里奥利质量流量计理论设计及灵敏度分析
Uncertainty Analysis of Measurement for Measuring AC and DC Voltages Meter by 1281 Digital Multimeter
1281型数字多用表测量交直流伏特表测量结果不确定度分析
d.c. bridge for measuring resistance
测量电阻用的直流电桥