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首页> 外文期刊>Electric power systems research >Fast and precise voltage sag detection method for dynamic voltage restorer (DVR) application
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Fast and precise voltage sag detection method for dynamic voltage restorer (DVR) application

机译：动态电压恢复器（DVR）应用的快速精确的电压跌落检测方法

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摘要

Voltage sag detection method has a significant impact on the performance of dynamic voltage restorer (DVR). This paper proposes a fundamental voltage amplitude detection method which is applicable in both single/three-phase systems for DVR applications. Advantages of the proposed method include application in distorted power grid without any low-pass filter, precise and reliable detection, simple computation and implementation without using a phased locked loop and lookup table. The proposed method has been simulated and implemented experimentally and tested under various conditions considering all possible cases such as different amounts of voltage sag depth (VSD), different amounts of point-on-wave (POW) at which voltage sag occurs, harmonic distortion, line frequency variation, and phase jump (PJ). A detailed procedure to design the threshold band for comparator is presented. According to the achieved results and detailed analysis, maximum ripple of the calculated fundamental voltage amplitude is +/- 0.3% in normal condition of line frequency and +/- 1% in the case of +/- 1 Hz variation of 60 Hz line frequency. In addition, the error between the actual fundamental voltage amplitude and the calculated one is almost zero in normal condition of line frequency and maximum of +/- 0.25% in the case of line frequency variation with excessive-harmonic distortion. Furthermore, detection time (DT) of the proposed method is analyzed in detail for different amounts of VSD, POW and PJ. The best and worst detection time of the proposed method were measured 1 and 8.8 ms, respectively. Finally, the proposed method has been compared with other methods available in the literature. (C) 2015 Published by Elsevier B.V.
机译：电压骤降​​检测方法对动态电压恢复器（DVR）的性能具有重大影响。本文提出了一种基本电压幅度检测方法，该方法适用于DVR应用的单相/三相系统。所提出的方法的优点包括：无需任何低通滤波器即可应用于失真电网；精确可靠的检测；无需使用锁相环和查找表即可进行简单的计算和实现。考虑到所有可能的情况，例如各种不同的电压骤降深度（VSD），发生电压骤降的波点（POW）数量，谐波失真，线路频率变化和相位跳变（PJ）。介绍了设计比较器阈值带的详细过程。根据获得的结果和详细分析，在正常的线路频率条件下，计算出的基本电压幅度的最大纹波为+/- 0.3％，在线路频率+/- 60 Hz +/- 1 Hz的情况下为+/- 1％ 。此外，实际的基本电压幅度与计算得出的基本电压幅度之间的误差在正常的线路频率条件下几乎为零，而在线路频率变化且谐波失真过大的情况下，最大值为+/- 0.25％。此外，针对不同数量的VSD，POW和PJ，详细分析了所提出方法的检测时间（DT）。该方法的最佳和最差检测时间分别为1 ms和8.8 ms。最后，将提出的方法与文献中可用的其他方法进行了比较。 （C）2015由Elsevier B.V.发布

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