voltage swell

The detection and location of the start point and end point of the voltage sag and swell is a key problem for the power quality monitoring.

对于短时低电压扰动发生、恢复时刻的检测与定位则是电能质量监测和统计中获取相关指标首先要解决的问题。

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This steady state rise in voltage is referred to as a swell. The sun swung steadily up the sky.

这种电压的稳态上升称为电压升高。太阳平平稳稳地升上天空。

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Furthermore, it can restrain efficiently absorbing energy from power system to ensure the safety of DVR when compensating voltage swell.

在补偿电压凸起时，能很好地抑制能量倒灌，保证DVR的安全。

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By applying it in power quality detection, simulation trials are done for voltage sag, voltage swell and voltage interruption including the harmonics in different order and so forth, respectively, in noise and color noise disturbance environments, the results show the effectiveness of the method.

将其应用在电能质量扰动检测中，对电压暂降、电压暂升、电压间断及各次谐波在白噪声和色噪声环境下进行仿真试验，结果证明了该方法是十分有效的。

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Among those several representative short-term power quality disturbances are introduced particularly, and their characteristics are analyzed. They are: voltage sag, voltage swell and voltage interruption;

其中，对几种有代表性的短时电能质量扰动作了详尽而细致的描述，分析了它们的扰动特征，分别是：电压凹陷、电压凸起和电压中断；

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The dynamic voltage restorer is designed as unilateral energy flow equipment which can compensate continuous voltage sag or swell resulted from the voltage drop of power cable.

动态电压恢复器采用单向馈能电路结构，可以在能量单向流动的情况下，实现对因电缆压降而产生的电压暂降或暂升的持续补偿。

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First, the wavelet coefficients of basic frequency are extracted to identify the short duration disturbance like voltage sag, swell and interruption.

先提取基波频段所在的小波系数将电压凹陷、电压凸起和电压中断分别检测出来；

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The four typical power quality disturbances of voltage sag, swell, interruption and transient impulse are used to test the proposed method, the effectiveness of which is verified by the simulation results.

对包括电压凹陷、电压上升、瞬时断电和暂态脉冲在内的4种典型电能质量扰动进行了测试，仿真结果表明了该方法的有效性。

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However, the coming substantive power electronic equipments, impactive and nonlinear loads in power system lead to a series of power quality problems, such as voltage sag, voltage swell, voltage fluctuation, harmonics, voltage notch, impulse, oscillation transient and so on.

但随之而来的各种电力电子设备、冲击性与非线性负荷的大量投入，导致供电质量出现电压暂降、电压暂升、电压波动、谐波、电压缺口、脉冲与振荡暂态干扰等一系列电能质量问题。

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The influence to sensitive load by voltage swell in electric network was restrained validly, by new electric power quality regular equipment such as dynamic voltage restorer ( DVR).

介绍了采用新型电能质量调节装置如动态电压恢复器有效抑制电网电压波动对敏感负载影响的方案。

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DVR is one of the hottest topic in this field, because it could compensate both steady state and dynamic voltage quality problems, such as voltage sag, voltage swell, the imbalance of three-phase voltage and harmonic.

它不仅可以解决电压跌落、凸起的动态电压质量问题，也可以补偿三相不平衡、电压谐波等稳态电压质量问题，是目前国内外的研究热点之一。

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This paper provides a new method for fast qualitatively detecting the disturbance sources, which is based on their statistical instantaneous characteristics. There are four examples imitated under MATLAB including harmonics, voltage sag, voltage swell, short-time transform of voltage dip.

提出一种基于检测点产生的瞬时负荷统计特性快速确认扰动源的方法，展示了该原理在谐波、电压凹陷、电压膨胀、瞬间电压降落四种扰动，在MATLAB下的仿真和计算结果。

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However, according to statistics most of power problems in power system are voltage dynamic sag and swell during the time from several milliseconds to five hundred milliseconds. But it is not voltage complete interruption.

而根据统计电力系统中供电问题大部分都是时间在几毫秒到500毫秒的电压动态跌落与升高，而不是电压完全中断。

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Based on the obtained magnitude characteristic of the signal and the morphologic gradient of the differential signal, five kinds of dynamic power quality disturbances, i.e., voltage sag, voltage swell, voltage interruption, transient pulse and oscillation, can be classified.

基于已得到的幅值特性和形态梯度可对五种动态电能质量扰动（电压暂降、暂升、中断、暂态脉冲和振荡）进行分类。

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The unbalanced voltage swell and over-voltage compensation problems in a transformerless dynamic voltage restorer ( DVR) are discussed.

讨论无串联隔离变压器的动态电压调节器（DVR）在不平衡电压浪涌或过电压情况下的补偿问题。

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The idea to develop a comprehensive monitoring system of power quality based on wavelet is brought forward. It monitors not only static power quality but also dynamic power such as voltage sag, swell and momentary interrupt.

本文提出了在小波分析的基础上开发电能质量综合监测系统的思想，不仅能监测常规的稳态电能质量问题，还能实现对电压骤降、骤升、间断等动态电能质量的监测。

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