Optimal Sizing and Placement of Multi Distributed Generation in Transmission Lines Using Differential Evolution and Firefly Algorithms

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The conventional practice for usage of distributed generation(DG) is in distribution system for loss reduction, voltage profile improvement etc. Recently the distributed generations were used in transmission network as well for overall performance improvement i.e. reduction in losses, reduced cost of electricity, congestion management, improvement in voltage levels. The practice of distribution generation in transmission system is effective if its location and rating of generation is scaled up. In this paper for optimal location of DG, fuzzy inference system is proposed which will decide the DG location. For optimal sizing of DG, differential evolution (DE) technique is proposed. The results were simulated on IEEE-30 bus transmission network. The results are compared with the results obtained by firefly algorithm. Keywords: Differential evolution (DE), Distributed generation (DG), Fuzzy inference system, Firefly algorithm (FF), Power loss, Voltage profile. I. Introduction In a country like India where growth of population is increasing at a much faster rate, the power demand is increasing as well in parallel. The solution to this is to install new generating stations to meet the increasing demand which is a costlier proposal. It takes a long time to erect a generating plant. Thus the economic way is to fully utilize the existing power system. Different concepts are proposed for increasing the utilization of existing power network or decreasing losses associated with it. In this paper introduction of DG as small scale source to transmission system for loss reduction and voltage profile improvement is presented. Distributed generation is done with through various small-scale power generation technologies. Distributed energy resources (DE) refers to a variety of small, modular power-generating technologies that can be combined with energy management and storage systems. Distributed generation is a technology which reduces the amount of energy lost in transmitting electricity because electricity is generated very near where it is used. This also reduces the size and number of power lines that must be constructed. Developing country like India can tap the potential of DG to extend their present generation capacity in an environment friendly manner.