Proper allocation of wind turbine DG unit is essential, as inappropriate allocation of the DG unit may adverse the system performance. The wind turbine DG supplies real power and in turn absorbs the reactive power. This paper proposes the application of Particle Swarm Optimization (PSO) technique to find the optimal placement of wind turbine DG in the primary distribution system to reduce the real power losses and improvement in voltage profile. The results are verified with analytical approach which uses analytical expressions of wind turbine characteristics for proper deployment of the DG unit and the effects on system performance are investigated. In the first segment, the optimal size of wind-based DG is calculated at each bus using the exact loss formula and in the second segment the optimal location of DG is found by using the least loss method. The proposed technique is tested on standard 33-bus and 69-bus test systems. (6 pages)