A novel approach for protection of radial and meshed microgrids
Mirsaeidi, S. and Dong, X. and Tzelepis, D. and Booth, C. (2018) A novel approach for protection of radial and meshed microgrids. In: 14th International Conference on Developments in Power System Protection, 2018-03-12 - 2018-03-15, Europa Hotel.
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Abstract
During grid-connected operation mode of microgrids, since the main grid provides a large short-circuit current to the fault point, the protection can be performed by the conventional protective devices, but in islanded mode, fault currents are drastically lower than those of grid-connected mode. Hence, employment of traditional overcurrent-based protective devices in micro-grids is no longer valid and some alternative protection schemes should be developed. This paper presents a micro-grid protection scheme based on positive-sequence component using Phasor Measurement Units (PMUs) and a Central Protection Unit (CPU). The salient feature of the proposed scheme in comparison with the previous works is that it has the ability to protect both radial and meshed micro-grids against different types of faults. Furthermore, since the CPU is capable of updating its pickup values (upstream and downstream equivalent positive-sequence impedances of each line) after the first change in the micro-grid configuration (such as transferring from grid-connected to islanded mode and or disconnection of a line, bus, or DER either in grid-connected mode or in islanded mode), it can protect micro-grid against subsequent faults. In order to verify the effectiveness of the proposed scheme and the CPU, several simulations have been undertaken by using DIgSILENT PowerFactory and MATLAB software packages.
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Item type: Conference or Workshop Item(Paper) ID code: 63652 Dates: DateEvent13 March 2018Published15 September 2017AcceptedSubjects: Technology > Electrical engineering. Electronics Nuclear engineering Department: Faculty of Engineering > Electronic and Electrical Engineering Depositing user: Pure Administrator Date deposited: 09 Apr 2018 10:23 Last modified: 08 Aug 2024 00:34 URI: https://strathprints.strath.ac.uk/id/eprint/63652