Abstract
This paper presents an efficient algorithm for determining the location, size and number of capacitors in unbalanced radial distribution system. The objective function formulated consists of two terms: cost for energy loss and cost related to capacitor purchase and capacitor installation. The cost function associated with capacitor placement is considered as a step function due to banks of standard discrete capacities. Genetic algorithms (GA) are used to obtain the solution of the proposed problem. In GA application, multi-population formulations that each load level is assigned to each subpopulation are derived. The strings in each population consist of the bus number index and size of capacitors to be installed. In order to determine the number of capacitor placement, the length mutation operator is used. Its efficiency is proved through the application in 10 buses and 25 buses unbalanced radial distribution systems.
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