Abstract—An Evolutionary Programming (EP) and Efficient Particle Swarm Optimization (EPSO) techniques are employed to solve Economic Dispatch (ED) problems including transmission losses in power system is presented in this paper. This paper is clearly justified with the results separately obtained for the above two techniques and also provided with the results by applying both the algorithms separately. With practical consideration, ED will have non-smooth cost functions with equality and inequality constraints that make the problem, a large-scale highly constrained nonlinear optimization problem. The proposed method expands the original PSO to handle a different approach for satisfying those constraints. In this paper, an Efficient Particle Swarm Optimization (EPSO) technique is employed so that optimized results are obtained, and by applying EP, faster convergence is obtained . To demonstrate the effectiveness of the proposed method it is being applied to test ED problems, one with smooth and other with non smooth cost functions considering valve-point loading effects. Comparison with other optimization and hybrid algorithm techniques showed the superiority of the proposed EP-EPSO approach and confirmed its potential for solving nonlinear economic load dispatch problems with losses.

Index Terms—Economic load dispatch , Evolutionary Programming , Efficient Particle swarm optimization , Valve point loading effect

Dr.K.Thauskkodi is with Director of Akshaya College of Engineering and Technology , Coimbatore , Tamilnadu , 642 109 , India .email :thanush_dr@rediffmail.com .Manuscript received October 30 , 2009.
S.Muthu Vijaya Pandian is with Department of Electrical and Electronics Engineering , V.L.B.Janakiammal College of Engineering and Technology , Coimbatore , Tamil Nadu , 640 042 , India. (Phone : +9198652 59633 ); Fax : +91 0422 2607152(email:ajay_vijay@rediffmail.com).

Cite: S. Muthu Vijaya Pandian and K. Thanushkodi, "Solving Economic Load Dispatch Problem Considering Transmission Losses by a Hybrid EP-EPSO Algorithm for Solving both Smooth and Non-Smooth Cost Function," International Journal of Computer and Electrical Engineering vol. 2, no. 3, pp. 560-568, 2010.