A Novel Method for Deriving Optimal Synchronism-Check Phase Angle in Transmission System

作者：Oh Yun Sik; Gwon Gi Hyeon; Kim Chul Hwan^*; Yang Jeong Jae

来源：Journal of Electrical Engineering and Technology, 2016, 11(5): 1084-1092.

DOI：10.5370/JEET.2016.11.5.1084

• EMTP
• Optimal synchronism-check phase angle
• Autoreclosing
• Synchronism-check
• Transmission system

Most of faults occurring in transmission system are transient. To cope with such faults, automatic reclosing is applied and it is economic and effective method to improve the reliability and transient stability of power system. Many countries applying 3-phase and leader-follower reclosing scheme use a synchronism-check relay to limit impacts associated with automatic reclosing under Live-Bus/Live-Line (LBLL) conditions. Most utilities generally use a standardized conservative setting that is in the range of 20 degrees to 30 degrees. However, it might be sometimes not a good idea because each transmission line in system has different system conditions such as system structure, line length and load flow that might result in undesirable system impacts. Therefore, it is necessary to derive the Optimal Synchronism-Check (OSC) phase angle which is appropriate for each transmission system. In this paper, a novel method composed of three steps is proposed to derive the OSC phase angle. The proposed method is applied to transmission system based on actual data from Korea. Computer simulations are performed using ElectroMagnetic Transient Program (EMTP) and simulation results show that proposed method is valid and effective.

• 出版日期2016-9