NDLI: Method to resolve false trip of non-directional overcurrent relays in radial networks equipped with distributed generators

Content Provider	IET Digital Library
Author	Maleki, Mahdi Ghotbi Chabanloo, Reza Mohammadi Javadi, Hamid
Abstract	The connection of distributed generation sources to the distribution network has negative effects on the network protection such as; a false trip of non-directional overcurrent relays. In this study, an offline method is proposed to overcome the false trip issue. In this method, the false trip is modelled as a new set of coordination constraints in the optimal coordination problem. For establishing false trip constraints, pickup current setting and characteristic type of relays are selected in addition to the time multiplier setting. Considering false trip constraints in the coordination problem increases the operating time of relays. Therefore, the optimisation is applied to obtain the settings of non-directional overcurrent relays in order to reduce their operating times in addition to resolving the false trip. Also, three new approaches are defined for pickup current selection based on pickup current range. A combination of genetic algorithm and linear programming technique is used to access optimised responses. Finally, the proposed method is implemented on a sample radial distribution network and the results demonstrated that the occurrence of the false trip was prevented and also the operating time of the relays was reduced to an acceptable level.
Starting Page	485
Ending Page	494
Page Count	10
ISSN	17518687
Volume Number	13
e-ISSN	17518695
Issue Number	Issue 4, Feb (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/13/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2018.5610
Journal	IET Generation, Transmission & Distribution
Publisher Date	2018-08-24
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Distributed Generation Sources Distributed Power Generation Distribution Network False Trip Constraint False Trip Issue Genetic Algorithm Linear Programming Nondirectional Overcurrent Relay Operating Time Optimisation Technique Overcurrent Protection Power Distribution Protection Power System Protection Relay Protection Sample Radial Distribution Network
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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