Abstract
Blackout occurrences could cause devastating circumstances in power systems. Experience shows that the execution of power system restoration would require certain expertise and understanding of power system characteristics. One of the critical issues in power system restoration is the possible excessive phase angle difference between two buses which are to be connected by a transmission line. If the standing phase-angle is larger than the synchrocheck relay setting, then the circuit breaker would not be allowed to close. Correspondingly, instability could result in power systems if an attempt is made to force the closing of the loop. This article describes a simple and reliable approach to reduce the standing phase-angle difference. This approach is based on the rescheduling of power generation to achieve the desired reduction in standing phase-angle. The proposed approach is much more reliable than the time consuming method of trial and error that is being prescribed in practice. The results of the application of the proposed approach on the IEEE 118-bus system are presented and discussed.