Use of Precision Time Protocol to Synchronize Sampled-Value Process Buses

Ingram, D. M. E.; Schaub, Pascal; Campbell, Duncan

doi:10.1109/tim.2011.2178676

Cited by 53 publications

(20 citation statements)

References 26 publications

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“…To assess the timing accuracy, the 1-PPS output from different timing devices are directly compared, as discussed previously in [2]- [3], [20]. However, instead of using an oscilloscope to measure the time difference, a Linux server with 22 peripheral 1-PPS input channels is employed as shown in Fig.…”

Section: Experiments Setup and Test Methodsmentioning

confidence: 99%

“…Synchronization test results on the GPS receivers used in substations are rarely published, despite the usual "quoted accuracy" of ±100 ns. This paper, will evaluate the long term accuracy of various GPS receivers and their transient behavior during satellite signal loss and restoration, and extend the work described in [2] and [20], by considering the effect of:-network topologies, excessive 1588 traffic, 1588 packet loss, communication link loss and complete GPS signal loss. The test setups and methods are described in Section II.…”

Section: Introductionmentioning

confidence: 98%

“…(1-PPS) and/or the IRIG-B time code, via dedicated fibre optic cable [2]- [3]. Considering the significant number of IEDs requiring a time source and that a single fibre optic cable may only carry time information to one device, it is inevitable that dozens of distributed GPS receivers are deployed within a power substation [4].…”

Section: Introductionmentioning

confidence: 99%

“…The IEEE 1588 Power Profile is defined by the IEEE C37.238-2011 standard [19] for the power system applications and specifies a number of fixed features so that interoperability and predictable performance can be obtained. Ingram et al conducted comprehensive tests on a network using the 1588 Power Profile in conjunction with 61850 SV and GOOSE applications; the results were used to assess the timing performance in terms of the 1-PPS delay, message compensation accuracy and system reliability [2] [20]- [21]. Synchronization test results on the GPS receivers used in substations are rarely published, despite the usual "quoted accuracy" of ±100 ns.…”

Section: Introductionmentioning

confidence: 99%

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Design of a Time Synchronization System Based on GPS and IEEE 1588 for Transmission Substations

Guo

Crossley

2017

IEEE Trans. Power Delivery

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 Abstract-Accurate timing is often required for the Intelligent Electronic Devices (IEDs) used in transmission substations. A common method of achieving this is direct connection of a device to a local GPS receiver and the use of its 1-PPS synchronizing signal and the IRIG-B coded message. However, concerns about GPS reliability are encouraging the use of timing systems less dependent on the direct use of local GPS receivers. IEEE 1588 protocol is a network based time synchronization technique designed to co-exist with IEC 61850 applications and deliver sub micro-second timing accuracy. Many utilities are now considering the adoption of IEEE 1588, but they need confidence in the reliability of this technology before it can be rolled out to real substations. Hence, comprehensive tests were undertaken on an IEEE 1588 timing system, to help gain insight into the limitations of the system. This paper presents a procedure to assess the performance of a timing system based on distributed GPS receivers and one based on a mixture of GPS receivers and IEEE 1588 devices. Test results indicate whichever system is selected, high quality devices and systems, with appropriate installation and engineering, are essential to satisfy the stringent ±1 µs accuracy requirements needed by critical IED applications.

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Section: Experiments Setup and Test Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of a Time Synchronization System Based on GPS and IEEE 1588 for Transmission Substations

Guo

Crossley

2017

IEEE Trans. Power Delivery

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“…In Australia, a full IEEE 1588 hardware testbed with Peer Delay Request-Response mechanism was built in 2012 [10]. Test results indicated that timing accuracy better than 500 ns could be obtained when three transparent clocks were used between grandmaster and slaves.…”

Section: Previous Application and Research Of Ieee 1588mentioning

confidence: 99%

Time synchronization for transmission substations using GPS and IEEE 1588

Crossley

Guo

2016

CSEE JPES

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Abstract-Time synchronization systems that utilize the global navigation satellite systems (GNSS) are widely used in the monitoring, control, and protection of transmission networks. They ensure that phasor measurement units (PMUs) can accurately monitor voltage phase angles, increase the accuracy of fault locators, enhance the capabilities of disturbance recorders, and allow differential feeder protection to use re-routable communication networks. However, concern about the reliability of GNSS receivers used in intelligent electronic devices (IEDs) have been reported; problems include mal-operations of differential protection, erroneous satellite timing/location messages, inappropriate installations, and blocking of satellite signals due to illegal use of GNSS jammers in vehicles.Utilities now require a timing system less dependent on the use of low cost GNSS receivers integrated into IEDs, but one that uses Grandmaster clocks, slave and transparent clocks, and an Ethernet communication network. The IEEE 1588-2008 synchronization protocol uses the Ethernet to disseminate a global time reference around a substation. A future substation will probably include duplicate 1588 grandmasters, each incorporating stable oscillators with GNSS and terrestrial receivers, in conjunction with a 1588 compliant Ethernet data network with slave and transparent clocks, and redundancy boxes for interfacing with IEDs.Although IEEE 1588 protocol is promising for future substation automation systems, its performance and impact has to be fully evaluated before it can be used in real substations. This paper describes how an IEEE 1588 time synchronization testbed is designed, constructed, and tested. Testing involves measuring the time offset when the Ethernet is heavily loaded with other traffic and the holdover capability of 1588 clocks. Additional delay introduced by IEEE 1588 traffic is also measured. As there is limited testing on GPS receivers within the power industry, this paper also uses the testbed to evaluate the steady state and transient behavior of GPS receivers. The results show a 1588 time synchronization system is accurate, secure, and ideally suited for protection and control applications, compared to a timing system merely based on GPS receivers. The information described in this paper should increase a utility's confidence in applying IEEE 1588 timing in a real substation.

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Fundamentals of Distributed MIMO and Cell-Free Mobile Communications

You

Wang

2020

Distributed MIMO and Cell-Free Mobile Communication

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Use of Precision Time Protocol to Synchronize Sampled-Value Process Buses

Cited by 53 publications

References 26 publications

Design of a Time Synchronization System Based on GPS and IEEE 1588 for Transmission Substations

Design of a Time Synchronization System Based on GPS and IEEE 1588 for Transmission Substations

Time synchronization for transmission substations using GPS and IEEE 1588

Fundamentals of Distributed MIMO and Cell-Free Mobile Communications

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