A Cosine Similarity Based Centralized Protection Scheme for DC Microgrids
Journal article, 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.

DC microgrid

communication

fault analysis.

cosine similarity

Centralized protection

Author

Rabindra Mohanty

Chalmers, Electrical Engineering, Electric Power Engineering

Subham Sahoo

Aalborg University

Ashok Kumar Pradhan

Indian Institute of Technology

Frede Blaabjerg

Aalborg University

IEEE Journal of Emerging and Selected Topics in Power Electronics

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

Vol. 9 5 5646-5656

Areas of Advance

Energy

Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/JESTPE.2021.3060587

Related datasets

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

DOI: 10.1109/JESTPE.2021.3060587

More information

Latest update

5/29/2024