Tools for Voltage Collapse Analysis and Applications

This paper describes the main features of an in-house software applied to the analysis of voltage collapse in power networks. This software may be applied not only for computing the voltage collapse point for a given load direction, but also for the “worst” load direction, applying algorithms based on the closest saddle-node bifurcation mathematical theory. The paper proposes an application of this closest bifurcation computation algorithm to the network expansion planning problem. The software includes also a sensitivity based algorithm in order to perform a fast filtering of critical line outages. Some results obtained applying the software to test cases on the uruguayan network are also described.