Numerical experiments with an optimal power flow algorithm based on parametric techniques

• Published in: IEEE transactions on power systems Vol. 16; no. 3; pp. 374 - 379
• Main Authors: Lima, F.G.M., Soares, S., Santos, A., Akmeida, K.C., Galiana, F.D.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2001; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Brazil; Equivalence; Inequalities; Inequality; Lagrangian functions; Large-scale systems; Load flow; Mathematical models; Optimization; Power flow; Power generation economics; Power system economics; Power system interconnection; Power systems; Process control; Propagation losses; Robustness; Strategy; Studies
• ISSN: 0885-8950; 1558-0679
• DOI: 10.1109/59.932271

This paper presents the results of numerical experiments with a new optimal power flow (OPF) algorithm based on a parametric technique. The approach consists of relaxing the original OPF problem by incorporating parametric terms to the objective function, the equality and inequality constraints. Such relaxation assures that any arbitrary initial solution, feasible or unfeasible, be the optimal solution of the OPF problem. As the scalar parameter changes, a family of OPF problems is created, whose necessary conditions are solved by Newton's method. An efficient strategy is proposed for updating the parameter and the optimal set of active inequality constraints of each intermediate problem. Two applications of the methodology are reported: the economic dispatch problem and the minimum transmission loss problem. These problems were solved for an 810-bus and a 2256-bus equivalent network of the South/Southeast interconnected Brazilian power system. The results show that the parametric approach is robust and efficient when applied to large-scale OPF problems.