Including stability constraints in optimal dispatch algorithms

As generation continues to increase in localized areas, transmission congestion will be encountered initially in the form of thermal limits on transmission lines. Continuing to add generation into constant effective system impedance will threaten a system stability limit. The focus of this paper is on developing stability constraints for optimal dispatch algorithms so that the resultant dispatch is favorable to power system security. Similar to existing thermally-constrained optimal dispatch algorithms, the results of the dispatch may lead to unequal nodal prices. The well-developed locational marginal pricing concept is adopted as a basis and expanded to include constraints associated with system stability.