1. A system for determining topology in an electrical power distribution system, comprising: a data bus; a processor in communication with the data bus; and a non-transitory computer readable storage medium in communication with the data bus, the non-transitory computer readable storage medium storing information comprising: a representation of a plurality of nodes in an electric power distribution system, wherein one or more nodes are in electrical communication with one or more other nodes; a representation of a plurality of topology links indicating a plurality of interconnections between the plurality of nodes; a representation of a status associated with each of a plurality of topology couplers configured to selectively enable electrical communication among at least two of the plurality of nodes via at least one of the plurality of topology links; a topology module executable on the processor and configured to determine which nodes are on a common electrical island based on the configuration of the plurality of topology links and the status of the plurality of topology couplers, and to assign each of the plurality of nodes and sources to a representation of its associated electrical island based on the configuration of the plurality of topology links and the status of the plurality of topology couplers; and, a load shedding module executable on the processor and configured to selectively shed at least one load based on the determination of which nodes and sources are on a common electrical island and based on a contingency trigger detected during a time interval.