US 12,191,672 B2
Devices and methods for disconnecting a grid power source from an electrical distribution system
Swardheep Babu, Singapore (SG); Zaixing Wang, Singapore (SG); Benoît Grappe, Voiron (FR); Samuel Kamajaya, Grenoble (FR); and Jikang Xu, Singapore (SG)
Assigned to Schneider Electric Industries SAS, Rueil Malmaison (FR)
Filed by Schneider Electric Industries SAS, Rueil Malmaison (FR)
Filed on Jun. 6, 2023, as Appl. No. 18/206,227.
Claims priority of application No. 22305847 (EP), filed on Jun. 10, 2022.
Prior Publication US 2023/0402851 A1, Dec. 14, 2023
Int. Cl. H02J 3/38 (2006.01); H02J 3/00 (2006.01); H02J 3/32 (2006.01)
CPC H02J 3/388 (2020.01) [H02J 3/0012 (2020.01); H02J 3/32 (2013.01); H02J 2203/10 (2020.01)] 13 Claims
OG exemplary drawing
 
1. An electrical distribution system configured to supply electric power to an electric load, the electrical distribution system comprising a feeder for connecting at least one electric load, a battery energy storage system connected to the feeder, and a connection point for connecting a grid power source to the feeder, the battery energy storage system comprising a battery, an electrical switchgear device and an electronic controller, the electrical switchgear device being configured to selectively connect the connection point to the feeder, wherein the electronic controller is configured to implement a virtual-synchronous generator control mode, and wherein the electronic controller is configured to:
detect an electric fault representative of a power loss event on the grid power source,
upon detecting an electric fault, automatically open the electrical switchgear device to disconnect the grid power source from the feeder, and
ensure that the battery energy storage system supplies electric power to the electric load while operating in a virtual-synchronous generator control mode,
wherein detecting an electric fault comprises detecting a voltage vector shift in voltage delivered by the grid power source, and
wherein detecting the voltage vector shift in the voltage delivered by the grid power source comprises:
measuring a duration of each cycle of the voltage delivered by the grid power source for each electrical phase,
comparing a duration of a current voltage cycle with a duration of a previous voltage cycle,
identifying a change in a voltage vector angle, and
identifying that a power loss condition has occurred if the change of the voltage vector angle exceeds a predefined threshold angle value.