A New GPS-based Digital Protection System for Smart Grids in Loop Structure

Liu, X. and Steurer, M. and Yu, M. (2014) A New GPS-based Digital Protection System for Smart Grids in Loop Structure. EAI Endorsed Transactions on Energy Web, 1 (3). e5. ISSN 2032-944X

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This paper presents a new digital protection system to solve the protection challenges in future smart grids, i.e., fast protection and fault isolation in a loop-structured system with limited magnitude of fault current. The new system combines two protection algorithms, i.e., a differential protection as the primary algorithm and an overcurrent protection as the backup one. The new system uses real-time Ethernet and digital data acquisition techniques to overcome the restriction on data transmission over large grids. The current measurements at different locations are time-synchronized by GPS clocks, and then transmitted to a central computer via the Ethernet. As opposed to digital relays which often contain PMU functionality nowadays, this approach uses time stamps on the instantaneous current values. We build a prototype of the new system on a test-bed. The results from simulations and experiments have demonstrated that the protection system achieves fast and accurate protection.

Item Type: Article
Uncontrolled Keywords: Smart grid protection, differential protection, GPS synchronization, and microcontrollers.
Subjects: T Technology > T Technology (General)
Depositing User: EAI Editor IV
Date Deposited: 07 Apr 2021 07:18
Last Modified: 07 Apr 2021 07:18
URI: https://eprints.eudl.eu/id/eprint/2200

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