A new under-voltage load shedding scheme for islanded distribution system based on voltage stability indices

Yusof, N.A. and Rosli, H.M. and Mokhlis, Hazlie and Karimi, M. and Selvaraj, Jeyraj and Sapari, N.M. (2017) A new under-voltage load shedding scheme for islanded distribution system based on voltage stability indices. IEEJ Transactions on Electrical and Electronic Engineering, 12 (5). pp. 665-675. ISSN 1931-4973

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Official URL: http://dx.doi.org/10.1002/tee.22452

Abstract

Under-voltage load shedding (UVLS) is an important technique to maintain the voltage stability and frequency of a power system network. UVLS has been applied widely in transmission systems to avoid system blackouts. However, with increasing penetration of distributed generation such as photovoltaic (PV) systems, the application of UVLS becomes important for islanded distribution systems. Under this condition, the network does not have a frequency reference as when it is connected to the grid. In this condition, when the load demand exceeds the PV capacity, UVLS is the only option to stabilize the system by shedding the load based on the changes of the voltage magnitude. In this work, a new UVLS scheme based on voltage stability indices is proposed. Four voltage stability indices are used as indicators for load shedding. Based on the stability indices, the loads that have the highest tendency of voltage collapse shall be the first ones to be shed. The proposed scheme is tested on a practical distribution network energized by a grid, a mini hydro generator, and a PV system. The test results on various scenarios prove that the proposed method is able to restore the system stability.

Item Type: Article
Uncontrolled Keywords: Distributed generation; Islanded distribution system; Under-voltage load shedding; Voltage stability index
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 12 Jun 2018 07:26
Last Modified: 10 Oct 2019 02:40
URI: http://eprints.um.edu.my/id/eprint/18878

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