Transmitting the Accurate Time Using the PTP Protocol for an Intellectual Smart Grid Network

Abstract

In the integrated power supply systems SMART-Grid, energy effici-ency, reliability, and survivabilityare ensured, to some extent, by continuous monitoring of the stability of parameters with reference to real-time signals. In accordance with the ІЕЕЕ С37-238-2017 standard, in order to provide power supply system with the time stamps, it is necessary, with respect to the concept of intelligent power sys-tem SMART Grid, to develop and implement the means for reproducing accurate time stamps with a microsecond accuracy. A protocol, which is capable to meet these re-quirements and does not require the development of a dedicated power system is the PTP protocol. The developed state standard of Ukraine DSTU IEC / IEEE 61850-9-3: 2018 defines a number of characteristics of the PTP protocol for both energy and other profiles. A full standardization of PTP protocol in Ukraine requires a development and adoption of the following document-based standards as the state’s ones: IEEE Std 1588 ™ — 2008 or IEC-61588: 2009, IEEE C37.238-2017. The appropriate schemes have been developed for testing a domestic complex of the US-1588M and US-1588S devices with the use of PtpMon2 software. During the tests, it is envisaged to perform short-term and long-term measurements of time cha­ -racteristics of the synchronization signals generated at the output of US-1588S de-vice. The measurement results are presented as the Time Interval Error (TIE) and Maximum Time Interval Error (MTIE), which is calculated as a maximum value of the TIE array at a given measurement interval by using v1 of the PTPmon2 software. Also, we investigated the complex US-1588, which provides the transmission of accurate time stamps’ signals using the PTP protocol. According to the results of experimental studies, the obtained accuracy of time stamps transmission does not exceed 1 μs, which meets the requirements of the IEEE S37-238-2017 standard to the energy profile of PTP.