| Title |
Countermeasure for Time Synchronization Error of Phasor data between Substations Based on Estimated Transmission Line Constant |
| Authors |
김민수(Min-Soo Kim) ; 강상희(Sang-Hee Kang) |
| DOI |
https://doi.org/10.5370/KIEE.2021.70.12.1854 |
| Keywords |
GPS fail; IEC 61850; Master clock fail; Time synchronization error estimation; Transmission line constant estimation |
| Abstract |
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. |