Optimal Allocation of Photo Voltaic Arrays in Radial Distribution System with Various Load Models

Abstract

In this paper, an effective methodology has been proposed for optimal allocation of renewablegeneration sources in the distribution system. The objective of this work is to minimize real andreactive power losses in the distribution systems. The output power of solar DGs mainlydepends upon solar irradiance level. So, before placement of these sources random nature ofsolar irradiance should be effectively modeled. A beta probability density function is used tomodel the solar irradiance and determine the exact output power of these sources. Further, thebest location for placement of solar DGs is found out using loss sensitivity factor. The optimalsizing of photo voltaic arrays corresponding to these locations is determined using fireflyalgorithm (FA). Different time varying load models such as residential, commercial andindustrial has been considered for the study along with probabilistic generation pattern. Thedeveloped method is tested on IEEE 69 bus test system. The obtained results show that optimalallocation of solar DGs in the distribution system gives a positive impact in terms of achievingbetter loss reduction and voltage profile enhancement. A comparative study is made for all theload models and the importance of considering different load models is projected.