Abstract –In this paper, optimal placement of distributed
generations has been studied accurately. A proper objective
function is proposed for distribution network losses reduction
and improvement of reliability indices,. A 20 kV sample network,
114 buses from Azarbaijan (Tabriz) Power Electric Distribution
Company is selected and different simulation has been performed
by using DIgSILENT software. Simulation results show network
losses are reduced, reliability indices of system are improved and
proposed objective function is very suitable and appropriate.