Representação de região de segurança em fluxo de Potência Ótimo

Abstract

This work presents an approach to include security constrints in the Optimal Power Flow (OPF) problem to provide a power system operation in a safe region. The proposed security region is formed by elliptical wraps that enclose historical and safe system operative states, which include wind power generation and demand scenarios. The elliptical wraps are obtained through a proposed non-Linear Programming (NLP) problem that defines the ellipse’s shape by using nodal voltages at buses of interest. In addition, the proposed approach provides the operator with the necessary actions to return the system to the safe state and determines the operational risk, that is, the risk of an operational state leaving the security region, applying a relaxation method. The proposed methodology is tested in the 39-bus New England system and 118-IEEE test system. The results show that the elliptical wraps are effective to enclose the secure operational states and maintain the system within a safe region.