Voltage Sag Frequency Assessment Considering Uncertain Influencing Factors in the Power System

Abstract

Many uncertain factors influence the assessment of voltage sag frequency (VSF), such as system operation modes, the fault rates of components and fault locations. In existing methods these factors are considered constant resulting in reasonless results. In this study, the uncertain property of fault location, system operation mode and failure rate of component are integrated to assess the VSF for the first time. The maximum entropy principle, typical operation modes and time-varying rate are used for characterizing the uncertainty of these factors. The assessing method and approaches are presented. Three cases considered different conditions are simulated on IEEE-30 standard testing system. The proposed method compared with Monte Carlo Simulation has been shown that it is reasonable and accurate and with good academic value and practical foreground.