Challenges in Protection of Converter Dominated Medium-Voltage Microgrids
Paper in proceeding, 2019
on key issues with overcurrent protection schemes with various configurations of DGs and connection points. It was found that the current magnitude based conventional overcurrent relays would fail to operate in islanded operation of microgrids, while in grid-connected mode, the relays would operate but with extended time delay or would not operate for certain fault locations with high penetration of DGs. Overrated converter interfaced DGs would cause problems such as relay blinding and sympathetic tripping. The problems are examined and discussed in cases with DGs interfaced by rated and overrated converters in islanded and grid-connected operations, as well as in cases of different connection points of DGs, energy storage system and fault locations in the microgrid. The paper also attempts to suggest and discuss a number of protection solutions to the presented issues considering cost and reliability aspects.
relaying
Medium-voltage microgrid
converter interfaced DG
protection blinding
sympathetic tripping.
Author
Rabindra Mohanty
Chalmers, Electrical Engineering, Electric Power Engineering
Peiyuan Chen
Chalmers, Electrical Engineering, Electric Power Engineering
Anh Tuan Le
Chalmers, Electrical Engineering, Electric Power Engineering
Anant Narula
Chalmers, Electrical Engineering, Electric Power Engineering
Proceedings of 2019 IEEE PES Innovative Smart Grid Technologies Europe, ISGT-Europe 2019
Vol. 2019 8905739
978-153868218-0 (ISBN)
Bucharest, Romania,
Areas of Advance
Energy
Learning and teaching
Pedagogical work
Subject Categories
Other Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.1109/ISGTEurope.2019.8905739