Enhanced Long-Term Voltage Security Assessment Through a Methodology that Combines P–V and Q–V Curves Analyses

Abstract

This work presents a methodology for long-term voltage security analysis of large-scale power systems. The proposed approach is based on the combination of different static methods (P–V and Q–V curves) and on the adequate modeling, in power flow studies, of real-time control actions taken by system operators. Tests using real cases, in which the interconnected Brazilian system has experimented operating problems, are employed to illustrate and validate the proposed approach. It can be seen that knowledge representation is essential to foresee adverse operating scenarios and that the combination of different static methods can provide helpful information for decision making in a real-time environment.