US 11,929,608 B2
Systems and methods for operating an islanded distribution substation using inverter power generation
Scott M. Manson, Moscow, ID (US); Jorge Fernando Calero, Coral Springs, FL (US); and Angelos Kokkinis, Collinsville, IL (US)
Assigned to Schweitzer Engineering Laboratories, Inc., Pullman, WA (US)
Filed by Schweitzer Engineering Laboratories, Inc., Pullman, WA (US)
Filed on Jun. 10, 2022, as Appl. No. 17/806,319.
Claims priority of provisional application 63/239,691, filed on Sep. 1, 2021.
Prior Publication US 2023/0062817 A1, Mar. 2, 2023
Int. Cl. H02H 7/22 (2006.01); H02H 1/00 (2006.01)
CPC H02H 7/22 (2013.01) [H02H 1/0007 (2013.01)] 18 Claims
OG exemplary drawing
 
9. A fault current detector configured to:
measure a first power flow associated with a point of common coupling breaker;
determine that the first power flow is below a threshold;
provide instructions to increase an operating frequency of an inverter higher than an initial operating frequency in response to determining that the first power flow is below the threshold;
measure a second power flow associated with the point of common coupling breaker;
determine that the second power flow is equal to or above the threshold based at least in part on increasing the operating frequency of the inverter; and
provide instructions to open the point of common coupling breaker in response to determining that the second power flow is equal to or above the threshold based at least in part on increasing the operating frequency of the inverter.