A tool to group and coordinate preventive controls actions on the context of voltage stability assessment

A new methodology for grouping and adjusting the most effective controls actions to prevent voltage instability in electrical power systems with multiple critical contingencies is developed in this paper. This methodology is based on a sensitivity analysis of the maximum loadability point with respect to voltage controls and a parallel evolutionary algorithm. Considering not only the effectiveness of the control elements but also their availability, the methodology designs a set of controllers to eliminate all critical contingencies. The methodology was successfully tested in a reduced south-southeast Brazilian system with 107 buses and 171 lines.