NDLI: Protection of multi-terminal remote DC microgrids with overhead lines against temporary and permanent faults

Content Provider	IET Digital Library
Author	Saleh, Khaled
Abstract	Multi-terminal low-voltage DC (MT-LVDC) remote microgrids are subjected to faults with low current magnitudes. Although such faults do not disturb microgrid steady-state operation, their continuous existence can lead to permanent (prm) power losses and personnel hazard. Yet, given that faults are often temporary (tmp) on overhead lines, instantaneous de-energisation of the entire microgrid upon fault detection can result in prolonged loss of infeed, i.e. loss of load. This study proposes a centralised protection scheme to achieve tmp-fault resilient MT-LVDC microgrids. The proposed approach is comprised of local intelligent electronic devices (IEDs) at each terminal and a central IED at one of the MT-LVDC microgrid terminals. Low-bandwidth communication is utilised between local and central IEDs. Local IEDs are equipped with overcurrent function to take fast protective action under faults with high current magnitudes. On the other hand, the central IED consists of two passive oscillators and DC choppers. The passive oscillators facilitate the detection and identification of tmp and prm faults with low current magnitudes. DC choppers are used for online pole voltage rebalancing upon tmp fault clearance. Testing the centralised protection scheme on a ± 750 V , TN-S grounded, MT-LVDC microgrid reveals that the approach is fast, sensitive, selective and resilient under various conditions.
Starting Page	2879
Ending Page	2889
Page Count	11
ISSN	17518687
Volume Number	14
e-ISSN	17518695
Issue Number	Issue 15, Aug (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/14/15
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2019.1517
Journal	IET Generation, Transmission & Distribution
Publisher Date	2020-03-05
Access Restriction	Open
Rights Holder	© Her Majesty the Queen in Right of Canada (As represented by the Minister of Natural Resources)
Subject Keyword	Central IED Central IEDs Centralised Protection Scheme Choppers (circuits) DC Choppers Distributed Power Generation Fault Detection Local IEDs Low Current Magnitudes Low-bandwidth Communication Microgrid Steady-state Operation MT-LVDC Microgrid Terminals Multiterminal Low-voltage DC Remote Microgrid Multiterminal Remote DC Microgrid Overcurrent Protection Overhead Power Line Permanent Fault Personnel Hazard Power Distribution Fault Power Distribution Protection Power Grid Power System Protection Power Transmission Fault Prm Fault Reliability Temporary Fault Tmp Fault Clearance Tmp-fault Resilient MT-LVDC Microgrid Voltage -750 V Voltage 750.0 V
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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