Analysis of voltage sags in distribution system.
配电系统电压跌落问题的分析。
Nearly 90% of all power quality problems are voltage sags and momentary outages.
在所有的电力质量问题中，几乎90%为电压降落与瞬间停电。
Voltage sags are systematically analyzed from the views of technique and economy.
本文从技术和经济两个方面对电压骤降进行了系统的分析。
In various power quality problems voltage sags are the worst dynamic power quality problems.
在各种电能质量问题中，电压跌落是危害最严重的动态电能质量问题。
There are several power quality issues such as power surges, voltage sags, outages, harmonics, etc.
电能质量问题包括以下几种：电涌、电压闪变、断电、谐波等。
The stochastic assessment method was presented for voltage sags of power distribution system for coal mining.
提出了一种用于煤矿配电系统电压衰减的概率评估方法。
Voltage sags due to line faults, transformer energizing and induction motor starting are main interference sources.
输配电线路故障、变压器投运、感应电动机启动是引起电压凹陷的主要原因。
Secondly, stochastic assessment of voltage sags is studied and a new method for multiple-meshed network is presented.
其次，对电压骤降随机预估的方法进行了研究，针对多网孔输电系统提出了一种新的随机预估方法。
The paper estimates the influence extent of node voltage sags on general equipment sensitivity by process performance index.
提出利用过程性能指数评估节点电压凹陷对一般敏感设备的影响程度。
Knowing the relativity of the voltage sags between the lines in complex power system will help to analyze and prevent the voltage sags.
明确复杂网络线路间电压暂降相关性将有助于分析和抑制电压暂降现象。
The simulation result indicates that this method can accurately detect the magnitude, duration and phase jump information of voltage sags.
实验结果表明该方法能正确地检测电压跌落的幅值、持续时间和相位跳变的信息。
Voltage sags have become a new focus of the study on power quality owing to significant changes of modern power systems and load profiles.
现代电网与负荷构成的变化使电压暂降问题成为热点。
Experiment results show that the proposed method can support the inverter DC bus voltage, and reduce the impact of voltage sags on VFD effectively.
试验证明上述方法在发生电压暂降时，很好的支撑了变频器直流母线电压使其保持基本不变，有效地降低了电压暂降对变频调速装置的影响。
Two common methods are used in study of characteristics of voltage sags, which are the measurement on voltage quality and the stochastic assessment.
研究电压暂降特征的方法有电压质量监测和随机预估。
Main duties of relay protection are correctly and quickly judging and clearing system faults, which greatly derive voltage sags in a distribution system.
系统中大部分电压跌落由故障引起，快速可靠地判断并切除故障是继电保护的主要职责。
This thesis systematically studies the impact of voltage sags on VFD, and analyzes the working principles and existing measures for the voltage sags mitigation.
本文系统地阐述了电压暂降对变频调速装置的影响，以及目前变频调速装置改善电压暂降的工作原理，并分析了存在的问题；
The Bayes formula is used for the traditional reliability indices, and the indices during the voltage sags are calculated with the outage of the sensitive loads.
在进行计及电压暂降的配网可靠性指标计算时，用贝叶斯网络计算常规的可靠性指标，结合敏感负荷的停运计算暂降时的指标。
A novel three-phase VSG is built by three-phase autotransformer and IGBT based bidirectional switch, can easily control the types of voltage sags, sag duration, sag depth and sag phase.
基于三相自耦变压器和由可控器件IGBT构成的双向开关实现的新型三相vsg，可以方便地控制跌落类型、跌落持续时间、跌落深度和跌落相位。
Power quality disturbances mainly include harmonics, voltage sags, voltage swells, voltage interrupts, flickers, oscillation transients, voltage sags with harmonic and voltage swells with harmonic.
电能质量扰动主要包括谐波、电压暂降、电压暂升、电压中断、电压波动、暂态振荡、谐波暂升和谐波暂降等电能质量问题。
By adding damp load at DC-side of the converter, redundant energy at DC-side during grid faults will be consumed, therefore the operating of wind turbine will not be influenced by grid voltage sags.
为增强直驱型变速恒频风电系统的低电压穿越能力，采取了变流器直流侧增加卸荷负载以在故障时消耗掉直流侧多余的能量，使风电机组的正常运行基本不受电压跌落影响的应对措施。
In this paper, soft startup and impact suppression techniques are proposed to guarantee no voltage overshoots or sags in DC bus during startup and grid connection dynamic processes.
本文提出了一种软启动和并网冲击抑制技术以解决启动和并网过程中直流电压大幅波动的问题。
Voltage sag is a crucial power quality problem. Due to the unbalance fault present in occurrence of sags, it is more complicated to deal with the unbalanced voltage sag.
电压暂降作为一种电能质量问题，由于不对称故障的存在，使处理不对称电压暂降变得复杂。
Voltage sag is a crucial power quality problem. Due to the unbalance fault present in occurrence of sags, it is more complicated to deal with the unbalanced voltage sag.
电压暂降作为一种电能质量问题，由于不对称故障的存在，使处理不对称电压暂降变得复杂。
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