The Impact of Time Synchronization Deviation on the Performance of Synchrophasor Measurements and Wide Area Damping Control

Bi, Tianshu; Guo, Jinrui; Xu, Kai; Zhang, Li; Qi, Yang

doi:10.1109/tsg.2015.2489384

Cited by 43 publications

(31 citation statements)

References 14 publications

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“…It is shown that the degraded time synchronizing performance directly leads to maloperation of industrial applications such as protection and control of power system apparatus [ 9 , 10 , 11 ]. Improved performance of the IEEE 1588 PTP is achieved in many ways, e.g., dealing with external disturbances and attack [ 11 , 12 , 13 ], providing enhanced clock synchronization methods [ 14 , 15 ], reflecting asymmetric network delay [ 16 , 17 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Distributed Nodes-Based Collaborative Sustaining of Precision Clock Synchronization upon Master Clock Failure in IEEE 1588 System

Son

Chang

2020

Sensors

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This paper proposes a distributed nodes-based clock synchronization method to sustain sub-microsecond precision synchronization of slave clocks upon master clock failure in IEEE 1588 PTP (precision time protocol) system. The sustaining is achieved by synchronizing the slave clocks to the estimated reference clock which is obtained from the analysis of distributed slave clocks. The proposed method consists of two clock correction functions (i.e., a self-correction and a collaborative correction, respectively). Upon master failure, the self-correction estimates a clock correction value based on the clock model which is constructed during normal PTP operation. The collaborative correction is performed in the preselected management node. The management node estimates a reference clock by collecting and analyzing clock information gathered from the other slave clocks. The performance of the proposed method is simulated by computer to show its usefulness. It is confirmed that the fifty (50) clock model-based collaborative correction maintains 10−6 second PTP accuracy for 10 min prolonged period after the master failure when tested with clock offset variations less than 50 ppm.

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Section: Introductionmentioning

confidence: 99%

Distributed Nodes-Based Collaborative Sustaining of Precision Clock Synchronization upon Master Clock Failure in IEEE 1588 System

Son

Chang

2020

Sensors

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“…Ref. [24] deduced and analyzed the impact of satellite timing deviation on PMU data measurement under static and dynamic conditions from a theoretical perspective.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of PMU Phase Angle Difference Induced by Frequency Deviation of Crystal Oscillator and its Detection Method

et al. 2020

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Phasor measurement unit (PMU), which could provide high-frequency phasors including the amplitude and phase angle synchronized with Global Positioning System (GPS)/BeiDou Navigation Satellite System (BDS) signal, plays a vital role in dynamic monitoring of power systems. However, if the GPS/BDS signal could not be received, the time of PMU, which depends on the crystal oscillator (CO), would cause measurement deviation due to frequency shifts of CO, and then the PMU data would engage deviations and deteriorate the relevant applications. In recognizing the above problems, this paper proposes a method to detect the frequency deviation of the crystal oscillator (FDCO) based on the correlation coefficient, according to its relation with the characteristic of the voltage phase angle difference(VPAD) between the two ends of the line. In detail, firstly, the quality of the VPAD of PMU between the two ends of the line is analyzed and the related problem is stated. Secondly, the characteristics of PMU data, when FDCO exists, are derived and analyzed, especially the VPAD between the line, and the suitability of the data for detecting the FDCO is discussed. Thirdly, the ideas and specific methods of detecting the FDCO in case of malfunction of GPS/BDS signal are proposed. Furthermore, the validity of the proposed method with simulation data and modified measured data is presented. Finally, the conjectures on the reasons for the approximately constant VPAD deviation in the previous section are discussed.

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“…Authors in [5] investigated the effect of synchronisation errors on transformer differential protection. The impact of time deviation on synchrophasor-based wide area monitoring, protection and control (WAMPAC) was studied in [6]. The vulnerability of a WAMPAC system due to malicious time synchronisation spoofing attacks was analysed in [7].…”

Section: Introductionmentioning

confidence: 99%

IEEE 1588 time synchronisation performance for IEC 61850 transmission substations

Han

Guo

Crossley

2019

International Journal of Electrical Power & Energy Systems

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Accurate timestamping with 1 µs precision is required by power system monitoring and control equipment, including: Phase Measurement Units (PMU) for real-time measurement and control; travelling wave detectors for fault location, protection and control; and sample value measurement techniques associated with the IEC 61850 process bus. The conventional way of achieving this is to transmit 1-PPS or IRIG-B timing signals using dedicated cables but such an approach is expensive and difficult to update as secondary control systems evolve. IEEE 1588 precision time protocol (PTP) allows the transmission of time information with submicrosecond accuracy in an Ethernet network. However, a comprehensive study is required to enhance the confidence of the power industry in using PTP in present and future IEC 61850 based substations. This paper delivers a design and experimental validation of the real-time time synchronisation characteristics achievable with IEEE 1588. Several factors which can potentially affect the synchronisation accuracy in delivering a time reference from the master clocks to the end devices during both steady-state and transient changes were investigated. The objective is to increase the understanding of the real-time performance of a complete IEEE 1588 timing system applied in transmission substations, and identify the limitations of commercially-available devices.

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The Impact of Time Synchronization Deviation on the Performance of Synchrophasor Measurements and Wide Area Damping Control

Cited by 43 publications

References 14 publications

Distributed Nodes-Based Collaborative Sustaining of Precision Clock Synchronization upon Master Clock Failure in IEEE 1588 System

Distributed Nodes-Based Collaborative Sustaining of Precision Clock Synchronization upon Master Clock Failure in IEEE 1588 System

Characteristics of PMU Phase Angle Difference Induced by Frequency Deviation of Crystal Oscillator and its Detection Method

IEEE 1588 time synchronisation performance for IEC 61850 transmission substations

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