A System Assessment Method for Voltage Sag Severity Based on Average Point-To-Line Distance Index

doi:10.11930/j.issn.1004-9649.202006095

Abstract

Abstract: In order to systematically compare the voltage sag severity of different regions, a system method is proposed to assess grid voltage sag severity. The method obtains the time duration intervals through cluster analysis, and gets the medians of residual voltages for different duration intervals, with which the median line is plotted. And then, the average point-to-line distance index is proposed to quantify the voltage sag severity for different regions. The voltage sag levels are graded according to index distribution features of different regions. The correctness and feasibility of the proposed assessment method are verified with the real monitoring data of a city power system. This method can effectively obtain from numerous monitoring data the voltage sag severity information of different regions, and realize the system assessment of the voltage sags from two dimensions: residual voltage and time duration, which is conducive to compare the voltage sag severity among different regions.

Key words: power quality, voltage sag, system assessment, point-to-line distance

ZHONG Qing, YAO Weilin, XU Zhong, ZHOU Kai, WANG Gang. A System Assessment Method for Voltage Sag Severity Based on Average Point-To-Line Distance Index[J]. Electric Power, 2020, 53(11): 9-14.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202006095

https://www.electricpower.com.cn/EN/Y2020/V53/I11/9

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