mohammad ahmadi - PHD student departman of electrical engineering ahvaz branch islamic azad university ahvaz iran
jafar tahmasebi - PHD student departman of electrical engineering ahvaz branch islamic azad university ahvaz iran
mohammad reza nori mehr - faculty member of department of electrical engineering ahvaz branch islamic azad university ahvaz iran

Due to the expansion of free markets of electrical energy the use of distribution generation DG units is increasing to provide power in distribution networks. The impact of dispersed productions on losses and the distribution network at the average pressure voltage is the main subject of this research DG has many benefical effects inclouding minimizing losses and operating costs increasing the power quality and improving the voltage profile on the network. using the PSO algorithm is to optimization losses and reavctivepower network .IEC test network includes 26 buses and 5 DG units witch has been implementedin the MATLAB software environment.

DG،optimization losses and reactive power، PSO algorithm