Journal ArticleDOI
Voltage sag distributions caused by power system faults
Pirjo Heine,Matti Lehtonen +1 more
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TLDR
In this paper, the authors established voltage sag distributions caused by faults at different voltage levels and experienced by low-voltage customers for four different power system areas, and the shares of different fault types at each voltage level and the sag propagation throughout the power system were taken into account.Abstract:
Voltage sag distributions caused by faults at different voltage levels and experienced by low-voltage customers were established for four different power system areas. The shares of different fault types at each voltage level and the sag propagation throughout the power system were taken into account. The results show that the origin of sags in urban and rural areas tends to be different. These data are needed when, for example, planning measures for sag mitigation in different parts of the power system.read more
Citations
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Journal ArticleDOI
Space Vector Method for Voltage Dips and Swells Analysis
TL;DR: In this paper, a new method for voltage dips and swells analysis is presented based on the space vector representation in the complex plane and the zero-sequence voltage, which is used to determine the dip/swell time occurrence, to classify and finally characterize the measured power quality disturbance.
Journal ArticleDOI
Design of a Discrete-Time Linear Control Strategy for a Multicell UPQC
Javier Munoz,Jose Espinoza,Carlos R. Baier,Luis Moran,Eduardo Espinosa,Pedro Melin,Daniel Sbarbaro +6 more
TL;DR: A discrete-time linear control strategy for a multilevel three-phase unified power quality conditioner (UPQC) based on single-phase power cells is presented and a dedicated local control strategy is proposed to ensure a symmetrical distribution of the power among the power cells.
Journal ArticleDOI
A New Approach to Multifunctional Dynamic Voltage Restorer Implementation for Emergency Control in Distribution Systems
TL;DR: In this article, a dynamic voltage restorer (DVR) is proposed to protect the point of common coupling (PCC) voltage and protect the DVR itself during a three-phase short circuit fault.
Journal ArticleDOI
Pareto Dominance-Based Multiobjective Optimization Method for Distribution Network Reconfiguration
TL;DR: The proposed hybrid optimization algorithm combines the concept of fuzzy Pareto dominance with shuffled frog leaping algorithm (SFLA) to recognize optimal nondominated solutions identified by SFLA and significantly increases the convergence speed of the algorithm.
Journal ArticleDOI
Voltage sag studies in distribution Networks-part I: system modeling
J.A. Martinez,J. Martin-Arnedo +1 more
TL;DR: In this paper, the first part of a work aimed at predicting the voltage sag performance of distribution networks using digital simulation and an EMTP-like tool was presented, where different models for representing some components can be used to obtain voltage sag characteristics with similar accuracy.
References
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Book
Understanding Power Quality Problems: Voltage Sags and Interruptions
TL;DR: This is the first book to offer in-depth analysis of voltage sags and interruptions and to show how to apply mathematical techniques for practical solutions to these disturbances.
Proceedings ArticleDOI
Fast assessment methods for voltage sags in distribution systems
TL;DR: In this paper, a voltage divider model is proposed to estimate the number of voltage sags at a specific load location, and an equivalent expression for the critical distance as a function of the critical phase-angle jump is derived.
Journal ArticleDOI
A method for estimating the frequency and cost of voltage sags
TL;DR: In this article, the authors proposed a method for retrieving sag-related information from statistics originally prepared for other purposes, and provided an estimate of the total annual sagrelated cost for each of the companies considered in this study and for each customer category.