A General Framework for Voltage Sag Performance Analysis of Distribution Networks

Amir Safdarian, Mahmud Fotuhi-Firuzabad and Matti Lehtonen
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Amir Safdarian: Electrical Engineering Department, Sharif University of Technology, Tehran 11365-11155, Iran
Mahmud Fotuhi-Firuzabad: Electrical Engineering Department, Sharif University of Technology, Tehran 11365-11155, Iran
Matti Lehtonen: Electrical Engineering and Automation Department, Aalto University, 02150 Espoo, Finland

Energies, 2019, vol. 12, issue 14, 1-15

Abstract: The proliferation of more sensitive loads has obliged distribution companies to pay greater attention to the voltage sag mitigation potential of different design alternatives in network planning studies. In doing so, a company has to have effective tools for estimating the voltage sag performance of its network. In this regard, this paper establishes a three-step framework for evaluating voltage sag performance of a distribution network. The first step, designated as state selection, is to select a network state in which voltage sag is likely. Although voltage sags have various causes, those that originated from faults in distribution networks are considered in this paper. The stochastic nature of fault location, type, resistance, and duration as well as the response of the protection system are taken into account. The second step, called state evaluation, deals with sag characteristics during the fault clearing time and the protection system response. The third step, named index calculation, is to estimate indices reflecting the sag performance of the network. A number of indices are proposed in this paper to reflect both system and load point-oriented issues. In light of the indices, companies may find effective solutions for voltage sag mitigation and customers choose appropriate solutions to provide ride-through support for their critical processes.

Keywords: distribution network; fault; load point oriented index; protection system; system oriented index; voltage sag; voltage sag performance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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