文章基本信息

标题：Modeling and Forecasting of Non-Stationary Voltage Flicker and Its Source Detection in Power System
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作者：AbdolmajidDejamkhooy ; Ali Dastfan ; AlirezaAhmadyfard 等
期刊名称：Journal of Electrical Systems
印刷版ISSN：1112-5209
出版年度：2014
卷号：10
期号：2
页码：223-237
出版社：ESRGroups
摘要：Conventionally voltage fluctuation, which causes to light flicker, is modeled by some sinusoidalsignals which are modulated in voltage amplitude. In this approximate model, amplitudefluctuation is assumed to be stationary and deterministic. Field measurements and practicalrecords show non-stationary treatment of the voltage fluctuation. Identification of flickersources is an important stage in flicker reduction process. Also modeling and forecasting of theenvelope signal are necessary for power quality enhancement and compensative devices control.In this paper after extracting voltage envelope by Enhanced Phase-Locked Loop (EPLL), theenvelope signal is filtered and uniformly sampled. A new flicker index, which is based on powerspectral density function, is proposed for evaluating non-stationary flicker intensity. Bycalculating the index at each bus of the power system, location of flicker source is detected. Wealso model non-stationary envelope of voltage using Moving Average (MA) and Autoregressive(AR). By this modeling, non-stationary envelope of the instantaneous voltage is written as arecursive function. This recursive model can be utilized as fluctuation predictor. Simulationresults show ability of the proposed flicker index in non-stationary flicker source detection andsuccess of the time series models in tracing and predicting of non-stationary envelope voltage.
关键词：non-stationary voltage flicker; time series; Moving Average (MA) model; Autoregressive;(AR) model; Enhanced Phase-Locked Loop (EPLL).