시뮬레이션에 기반한 순간전압강하 평가 기술에 대한 비교 분석 연구

Abstract

This thesis deals with a comparative analysis among existing voltage sag assessment methods. In a modern industrial complex, voltage sag causes misoperation and trip of voltage sensitive equipment. Such problems can lead to huge financial losses. The estimation of expected sag frequency at sensitive load site is an effective way for selecting optimal countermeasures against voltage sags. There are several methods based on computer simulation for estimating voltage sag frequency. These methods have strength and weak points. However, a valuable comparative analysis has not been performed. In this thesis, three methods for voltage sag assessment are analyzed. Also, a comparative analysis regarding calculation accuracy and efficiency between two representative methods of fault position and AOV(area of vulnerability) based methods is performed. The analysis results provide full understanding about voltage sag assessment methods and a difference in the performance of fault position and AOV based methods.