A Cosine Similarity Based Centralized Protection Scheme for DC Microgrids
Artikel i vetenskaplig tidskrift, 2021

Unlike the phasor measurement based protection in AC systems, the protection of DC systems deals with complex fault transients which mandates the isolation of the faulted segment within few milliseconds as continued fault current leads to overheating issue in power electronic converters. To this end,
several works have been suggested based on unit and nonunit protections for DC microgrids. Threshold selection and protection coordination are the challenges associated with nonunit protection. Similarly, communication delay and link failure limit the application of unit protection. To address these issues, this paper presents a robust centralized protection scheme for DC microgrids, which is resilient to communication delay and link failure. It uses current of each line segment to compute the similarity of current change at both ends of the line segment to derive the protection decision. To overcome the communication failure from one end of the line segment or even from multiple segments, the proposed method uses data from adjacent segments to derive the protection decision correctly. Using PSCAD/EMTDC environment, the performance of the proposed method is evaluated for various cases and compared with available techniques. Finally, the accuracy of the protection algorithm is validated under experimental conditions.

Centralized protection

cosine similarity


fault analysis.

DC microgrid


Rabindra Mohanty

Chalmers, Elektroteknik, Elkraftteknik, Elnät och komponenter

Subham Sahoo

Aalborg Universitet

Ashok Kumar Pradhan

Indian Institute of Technology Kharagpur

Frede Blaabjerg

Aalborg Universitet

IEEE Journal of Emerging and Selected Topics in Power Electronics

2168-6777 (ISSN) 2168-6785 (eISSN)

Vol. In Press




Annan elektroteknik och elektronik



Relaterade dataset

A Cosine Similarity Based Centralized Protection Scheme for DC Microgrids [dataset]

DOI: 10.1109/JESTPE.2021.3060587

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