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A New Fast-Acting Backup Protection Strategy for Embedded MVDC Links in Future Distribution Networks.
- Source :
- IEEE Transactions on Power Delivery; Apr2021, Vol. 36 Issue 2, p861-869, 9p
- Publication Year :
- 2021
-
Abstract
- This paper presents a new fast-acting backup protection strategy for future hybrid ac-dc distribution networks. By examining the impedance measured by a distance protection relay measuring from the “ac-side” of the network, a unique characteristic is established for faults occurring on the “dc-side” of an embedded medium-voltage dc (MVDC) link, interconnecting two 33 kV distribution network sections. Based on the identified impedance characteristic, appropriate settings are developed and deployed on a verified software model of a commercially available distance protection relay. To remain stable for ac-side faults, it is found that the tripping logic of the device must be altered to provide correct time grading between standard, ac, protection zones and the fast-acting dc region, which can identify faults on the dc system within 40 ms. An additional confirmatory check is also employed to reduce the likelihood of mal-operation. Trials on a test system derived from an actual distribution network, which employs distance protection, are shown to provide stable operation for both ac-side and dc-side pole-pole and pole-pole-ground faults. [ABSTRACT FROM AUTHOR]
- Subjects :
- TEST systems
LOGIC devices
BIPOLAR transistors
FAULT currents
Subjects
Details
- Language :
- English
- ISSN :
- 08858977
- Volume :
- 36
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Power Delivery
- Publication Type :
- Academic Journal
- Accession number :
- 149510290
- Full Text :
- https://doi.org/10.1109/TPWRD.2020.2995479