Countermeasure for Time Synchronization Error of Phasor data between Substations Based on Estimated Transmission Line Constant

Time synchronization error between adjacent substations may cause the mal-operation on transmission line protective IEDs. To solve this problem, this paper assumes a situation where time synchronization error occurs between substations due to GPS/Master clock fail, etc., and estimates the changing transmission line constant due to weather, and uses them to estimate the voltage/current phasor of adjacent substations. The estimated voltage/current phasor of adjacent substation are compared with the IEC 61850-based received voltage/current phasor of adjacent substation to estimate the time synchronization error between substations. In this paper, to verify the schemes proposed, the testbed was built with IMU (implemented with AM572X, ADS8688), grand master clock (LANTIME M1000-IMS), network switch (Ruggedcom RSG 2488), RTDS and the target power system was modelled with RSCAD. The results of this research are expected to provide a good guide to constructing the full digital substation. © The Korean Institute of Electrical Engineers This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.