Keywords: economic dispatch, fuel cost, trigonometric variable, Hooke-Jeeves¡¦method, new formulation
Received March 30, 2006; revised July 26 & August 30, 2006; accepted November 1, 2006.
Communicated by Tei-Wei Kuo.
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Lahouaria Benasla, Abderrahim Belmadani* and Mostefa Rahli
Department of Electrical Engineering
*Department of Computer Science
University of Sciences and Technology of Oran
Oran, B.P 1505 Algeria
E-mail: rahlim@yahoo.fr
The Economic Dispatch Problem (EDP) is one of the important optimization problem
in a power system. Traditionally, in EDP, the cost function for each generator has
been approximately represented by a single quadratic function. The main aim of EDP is
to minimize the total cost of generating real power while satisfying the equality constraints
of power balance and the inequality generator capacity constraints. In this paper
a New Economic Dispatch Problem Formulation (NEDPF) has been proposed to solve
EDP. This new formulation is based on the reduction of the number of variables (number
of generators) and elimination of the equality and inequality constraints, thus the transformation
of the constrained non linear programming problem to an unconstrained one.
The new unconstrained objective function, is minimized by Hooke-Jeeves¡¦ method. The
NEDPF was tested for different cases (2, 3 and 6 generator units) and the results are
judged satisfactory.
Received March 30, 2006; revised July 26 & August 30, 2006; accepted November 1, 2006.
Communicated by Tei-Wei Kuo.