Abstract: Technologies are provided for circuit topology detection in an electric power circuit. In some embodiments, a computing device can access phasor data associated with the electric power circuit including an arrangement of switching devices and multiple phasor measurement units. The computing device also can access threshold data defining individualized zero-current threshold values for respective ones of the multiple phasor measurement units. The computing device can determine one or more zero-current branches present in the arrangement of switching devices by applying the individualized zero-current thresholds to the accessed phasor data. The computing device can further determine, based on the one or more zero-current branches a circuit topology corresponding to the arrangement of switching devices.

Abstract: For a power-system configuration, correspondence between a phase-angle, alone or combined with a voltage magnitude, representative of an operational state of the power-system configuration and a proximity to voltage-collapse for the power-system configuration can be provided. A proximity to voltage-collapse for the power-system configuration can be determined based at least in part on an observation of the phase-angle and the correspondence between the phase-angle and the proximity to voltage-collapse for the power-system configuration. A remedial action contemplated to maintain voltage-stable operation of the power-system configuration can be taken responsive to the proximity to voltage-collapse for the power-system configuration falling below a selected threshold proximity. Systems, apparatus, and methods embodying such innovative principles can be used to plan, to design, and/or to operate voltage-stable power systems.