Analysis And Simulation Of Economic Load Dispatch in Power System

In an interconnected power system a large number of generating units with different ratings and performance functions are connected together. Total power generation need to meet the load demand satisfying the system constraints. Also it is very important to minimize the cost of generation of power. Some optimization technique needs to be used for the cost minimization. Economic load dispatch (ELD) is one of the optimization technique used to minimize the cost of power generation. ELD can allot the power generation of each generating unit and optimize the cost of power generation satisfying the system constraints of the power system. Several approaches to solve ELD problems include lambda iteration, dynamic programming and linear programming etc. Lambda iteration method is demonstrated in this paper with two different conditions, which are transmission system with and without losses. In this paper four thermal generating units with different performance functions and generator limits are considered for the analysis and simulation is conducted in Mipower software. Lambda iteration is a fast converging method to minimize the cost of generation of power where correct assumption of initial value of lambda helps to converge the results quickly.