US 12,003,087 B2
Time synchronization between IEDs of different substations
Johan Salj, Eskilstuna (SE)
Assigned to Hitachi Energy Ltd, Zürich (CH)
Appl. No. 17/796,248
Filed by Hitachi Energy Ltd, Zürich (CH)
PCT Filed Jan. 27, 2021, PCT No. PCT/EP2021/051787
§ 371(c)(1), (2) Date Jul. 28, 2022,
PCT Pub. No. WO2021/151909, PCT Pub. Date Aug. 5, 2021.
Claims priority of application No. 20154871 (EP), filed on Jan. 31, 2020.
Prior Publication US 2023/0077975 A1, Mar. 16, 2023
Int. Cl. H02H 1/00 (2006.01); H02H 7/26 (2006.01); H04L 7/00 (2006.01)
CPC H02H 1/0061 (2013.01) [H02H 7/263 (2013.01); H04L 7/0008 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for time-synchronized communication of packets between a first substation and a second substation interconnected by a communication channel, wherein the method is performed at the first substation, and wherein the method comprises:
receiving a packet of samples from the second substation over the communication channel, wherein the samples have been obtained within the second substation and provided with time information associated with a common reference clock;
receiving a time indication from the common reference clock over the communication channel; and
performing time-wise synchronization of the samples of the received packet with samples obtained within the first substation by time-wisely compensating the samples of the received packet by means of the time information and a first time difference between the common reference clock and a local reference clock of the first substation.