Transient stability monitoring and preventive control based on CCT

This paper focuses on transient stability (TS) problem. TS is a critical factor in many power systems, where increase in uncertainty due to renewable energy (RE) generations tends to introduce difficulties in maintaining system reliability. We show that there may exist various critical patterns of uncertain power flows due to photovoltaic (PV) generations in West Japan System. We propose the use of critical clearing time (CCT) as a TS index. We also suggest a distribution factor (DF) to control CCT, which is referred to as CCT-DF in this paper. Then, the proposed worst-case optimization method is applied to the TS control problem to develop a robust security monitoring and control method under uncertain PV generations.