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Energies 2017, 10(11), 1885; doi:10.3390/en10111885

Novel Strategy for Accurate Locating of Voltage Sag Sources in Smart Distribution Networks with Inverter-Interfaced Distributed Generators

1,2
,
1,2,* , 1,2
and
3
1
School of Electrical Engineering, Wuhan University, Wuhan 430072, China
2
Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, Wuhan 430068, China
3
Central China Branch of State Grid Corporation of China, Wuhan 430063, China
*
Author to whom correspondence should be addressed.
Received: 27 October 2017 / Revised: 11 November 2017 / Accepted: 13 November 2017 / Published: 16 November 2017
(This article belongs to the Section Electrical Power and Energy System)
View Full-Text   |   Download PDF [1780 KB, uploaded 17 November 2017]   |  

Abstract

With the aid of power quality monitoring systems (PQMSs), accurate locating of voltage sag sources, which has important significance for guiding maintenance personnel in finding and repairing faults as well as improving power supply reliability, has been becoming a new research hotspot. However, existing methods have unsatisfactory locating accuracy due to the integration of distributed generators (DGs) and fault resistance. In this paper, a novel strategy for accurately locating voltage sag sources in smart distribution networks is proposed. Based on inverse theory, which is well applied in geophysics, the accurate location issue is treated as a two-step optimization model. It aims at making the distribution of voltage phasors and current phasors obtained by theoretical short-circuit calculation match those actually observed as closely as possible. To guarantee the feasibility of the strategy, the effect of inverter-interfaced DGs (IIDGs) which are the main form of DG is considered in the short-circuit calculations. To guarantee the location accuracy of the strategy, fault resistance is treated as an optimization variable in the two-step optimization model to eliminate estimation error of fault resistance. Via two modified IEEE benchmarks with different scales, the validity and the superiorities in applicability and accuracy of the proposed strategy are verified. View Full-Text
Keywords: smart distribution network; voltage sag; short-circuit fault; accurate locating; inverse theory; two-step optimization model; inverter-interfaced distributed generator smart distribution network; voltage sag; short-circuit fault; accurate locating; inverse theory; two-step optimization model; inverter-interfaced distributed generator
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chen, R.; Lin, T.; Bi, R.; Xu, X. Novel Strategy for Accurate Locating of Voltage Sag Sources in Smart Distribution Networks with Inverter-Interfaced Distributed Generators. Energies 2017, 10, 1885.

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