Patent Document ID: 9625887
Application ID: 13958248
Patent Flag: 1

Claim One:
1. A method of performing a contingency screening of an electrical power network, the method comprising: receiving a previously computed, modular representation of the electrical power network, wherein the modular representation includes: a zoomed-in representation defined by a first plurality of variables and having internal line connections; and a zoomed-out representation defined by a second plurality of variables and having tie-line connections, wherein the first plurality of variables includes at least one variable not included in the second plurality of variables and at least one of the second plurality of variables is derived from a linear combination of line flows of two or more of the internal line connections; receiving a line outage having an outage type, including receiving a line outage for which the outage type is an internal outage; determining whether to recompute the zoomed-out representation or both of the zoomed-in and zoomed-out representations as a function of the outage type, including determining that both of the zoomed-in and zoomed-out representations need to be recomputed based on the internal outage; and recomputing, based on the line outage, the one(s) of the zoomed-in and zoomed-out representations determined at said determining step, including recomputing both of the zoomed-in and zoomed-out representations as a function of the internal outage; wherein recomputing the zoomed-out representation includes recomputing the zoomed-in representation to account for an outage and performing a forward transformation as a function of the recomputed zoomed-in representation to produce a recomputed zoomed-out representation.