Time synchronization between IEDs of different substations
AssigneeHitachi Energy Ltd
InventorJohan Salj
Life of this patent
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Abstract
There is provided mechanisms for time-synchronized communication of packets between a first substation and a second substation interconnected by a communication channel. Samples obtained within the second substation are provided with time information associated with a common reference clock and sent to the first substation, at which a time-wise synchronization of the received samples with samples obtained within the first substation is performed by means of the time information and a time difference between the common reference clock and a local reference clock of the first substation.
Claims20
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.
An intelligent electronic device (IED) for time-synchronized communication of packets between a first and a second substation interconnected by a communication channel, the IED comprising processing circuitry, the processing circuitry being configured to cause the IED to perform a method comprising:
- 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.
A non-transitory computer-readable storage medium having stored thereon a computer program comprising computer code which when run on processing circuitry of an intelligent electronic device (IED) of a first substation, interconnected by a communication channel with a second substation, causes the IED to perform a method comprising:
- 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.
Dependencies are inferred from the claim text.