Abstract-This paper presents the application of an efficient shuffled frog leaping algorithm (SFLA) to solve the optimal generation expansion planning (GEP) problem. The SFLA is a meta-heuristic search method inspired by natural memetics. It combines the advantages of both genetic-based memetic algorithms and social behavior based algorithm of particle swarm optimization. Least-cost GEP is concerned with a highly constrained non-linear discrete dynamic optimization problem. In this paper the proposed formulation of problem, determines the optimal investment plan for adding power plants over a planning horizon to meet the demand criteria, fuel mix ratio, and the reliability criteria. To test the proposed SFLA method, it is simulated for two test systems in a time horizon of 10 and 20 years respectively. The obtained results show that compared to the traditional methods, the SFLA method can provide better solutions for the GEP problem, especially for a longer time horizon.Index Terms-Generation expansion planning, probabilistic production simulation, shuffled frog leaping algorithm.
I. INTRODUCTIONThe Generation Expansion Planning (GEP) is a problem to determine when, where, what type and how much capacity of new power plants should be constructed over a long-term planning horizon to meet forecasted demand according to a pre-specified reliability criteria. GEP is an important decision-making activity for utility companies. The main objective of GEP is to minimize the total investment, operating, and outage (energy-not-served) costs of power system.There are generally two deterministic and stochastic approaches to solve the GEP problem. The Stochastic approach takes into account uncertainties associated with the input data, such as forecasted demand, fuel prices, economic and technical characteristics of new evolving generating technologies, construction lead times, and governmental regulations [1]. The deterministic approach solves the problem under different scenarios. In this case a fast and efficient method is required because of great number of simulations needed to be run under different scenarios.Least-cost GEP is concerned with a highly constrained non-linear discrete dynamic optimization problem. The high non-linearity of a GEP problem originates from the nature of the production cost and the set of non-linear constraints. The dynamic programming (DP) approach is one of the most used Manuscript received February 20, 2012; revised March 16, 2012 algorithms in GEP. However in the generation expansion problem, due to high dimensionality, the DP is not an efficient method for real power systems. In commercial packages like WASP [2], to overcome this difficulty, heuristic tunnel-based techniques are used in DP routine, where users pre-specified configurations and successively modified tunnels are considered to arrive at local optimums.The emerging optimization techniques used to solve GEP problem were reviewed in [3]. In [4] the meta-heuristic techniques; such as Genetic Algorithm, Differential Evolution, Evolu...