Relieving Flow Limits in Continuation Power Flows by Generation Rescheduling

This paper explores an idea to handle flow
limits, by means of generation rescheduling before
reaching system hard limits, by extension and
reformulation of continuation power flow problem. In
particular, we focus on the reformulation and extension of
a “standard” continuation power flow method so that
include generator rescheduling when a flow on a given
line exceeds some specified limit, and provide details on
analytical expressions to determine most effective
generators to be assigned for the limit handling. Four
options for active generation rescheduling are considered:
based on topology analysis, sensitivity studies, generator
margins, and cost considerations. Results of the tests
obtained using the IEEE-39 and IEEE-118 bus systems are
given to illustrate the performance of the methodology. We
also discuss possible extensions of the approach