US 11,721,975 B2
System and method for use with microgrids having inverter-based distributed generators
Khaled Saleh, San Jose, CA (US); and Ali Mehrizi-Sani, Blacksburg, VA (US)
Assigned to HIS MAJESTY THE KING IN RIGHT OF CANADA, AS REPRESENTED BY THE MINISTER OF NATURAL RESOURCES, Ottawa (CA)
Filed by HIS MAJESTY THE KING IN RIGHT OF CANADA, AS REPRESENTED BY THE MINISTER OF NATURAL RESOURCES, Ottowa (CA)
Filed on Apr. 30, 2021, as Appl. No. 17/302,357.
Claims priority of provisional application 63/050,242, filed on Jul. 10, 2020.
Prior Publication US 2022/0014021 A1, Jan. 13, 2022
Int. Cl. H02J 3/00 (2006.01); H02J 3/38 (2006.01); H02H 3/52 (2006.01); H02H 7/122 (2006.01); H02H 3/04 (2006.01)
CPC H02J 3/001 (2020.01) [H02H 3/042 (2013.01); H02H 3/52 (2013.01); H02H 7/122 (2013.01); H02J 3/381 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A system for control of a microgrid, said system comprising:
a plurality of inverter-based distributed generators within said microgrid, each one of said plurality of inverter-based distributed generators injecting into said microgrid a corresponding one of a plurality of differentiable harmonic currents upon a fault condition within said microgrid; and
a plurality of directional overcurrent relays in said microgrid, said plurality of directional overcurrent relays being for detection of said harmonic currents;
wherein isolation of a faulted section of said microgrid is enabled based upon said harmonic currents detected, and
wherein, to locate said faulted section, said plurality of directional overcurrent relays use a ratio of said harmonic currents measured on both ends of a segment of said microgrid with each end of said segment having a microprocessor-based directional overcurrent relay.