A New GPS-based Digital Protection System for Smart Grids in Loop Structure
Journal Title: EAI Endorsed Transactions on Energy Web - Year 2014, Vol 1, Issue 3
Abstract
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.
Authors and Affiliations
X. Liu, M. Steurer, M. Yu
Keywords
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- EP ID EP45124
- DOI http://dx.doi.org/10.4108/ew.1.3.e5
- Views 318
- Downloads 0
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