Handling flow limits during maximum loadability determination

In this paper a methodology that handles a wide range of flow limits by extension and formulation of a continuation power flow so that include generator redispatch when a flow on a given line exceeds some specified limit, is proposed. Four options for active generation redispatch are introduced: based on topology analysis, sensitivity studies, generator margins, and cost considerations. The applicability of the methodology in deregulated environments for operating a power system within its security constraints is discussed in the paper. The power system model is based on a computationally efficient point of collapse power flow. Results of the tests obtained with help of the IEEE-39 and IEEE-118 bus systems are given to illustrate the performance of the methodology.