Generation rescheduling methods to improve power transfer capability constrained by small-signal stability

Small-signal stability, often in the form of low frequency oscillations, has been found to be the limiting factor when determining power transfer capabilities in a number of power systems. This paper proposes a new strategy to improve the power transfer capability constrained by small-signal stability by appropriately rescheduling generation based on sensitivity analysis. In the proposed strategy, a small-signal stability index, which can be computed quickly and reliably, is used to determine the small-signal security status of a system and also for the purpose of contingency screening. Two sensitivitybased dispatch methods are proposed to reschedule the generation in order to maximize power transfer subject to the smallsignal stability constraint under a set of selected contingencies. The effectiveness of the proposed methods is demonstrated by comparing with other generation dispatch methods on a real power system model.