Planning substation capacity under the single-contingency scenario

Florida Power and Light (FPL) adopts the single contingency emergency policy for its planning of substation capacity. This paper provides an approach to determine the maximum load which a substation can take on under such a policy. The authors´ approach consists of two linear programming models which determine: (1) the maximum substation load capacity; and (2) the reallocation of load when a substation´s demand cannot be met. Both models are formulated under the single-contingency scenario, an issue which has received little attention in the literature. Not only does this explicit treatment of the scenario provide an exact measure of a substation´s load limit, it also raises several important issues which previous works omit. These two models have been applied to the substation network of the Fort Myers District of the State of Florida, USA