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Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

ISO Journal TitleJ Korean Inst. IIIum. Electr. Install. Eng.
Title Stochastic Method to Assess Voltage Sag Performance Considering Sag Duration in Large Power System
Authors Myeong-Cheol Lee ; ???Chang-Hyun Park
DOI http://dx.doi.org/10.5207/JIEIE.2016.30.2.085
Page pp.85-92
ISSN 1225-1135
Keywords Power Quality ; Protection System ; Sag Duration ; Sag Magnitude ; Voltage Sags
Abstract The paper presents a method to assess system voltage sag performance considering sag durations as well as magnitudes. In general, voltage sag assessment for large power systems is performed only considering sag magnitudes at sensitive load points. However some equipment can be affected by certain sag durations. The duration of the voltage sag is depend on the time of fault current flow in the system. Therefore, the duration can be determined by analyzing the operating characteristic of the protection system. In this paper, an effective method to evaluate sag durations regarding the characteristics and failure rates of the protection system is described. The proposed method can be used to assess the long-term performance of the voltage sags in large power system.