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The level of penetration for Distributed Generation (DG) in Distribution network (DN) is on the verge. Therefore, the impact assessment of voltage stability studies has become a vital task. In order to optimally place DGs, Optimization techniques are used. This study introduces an approach to optimally place and size DG in order to maintain voltage levels and minimize line losses. A Voltage stability index (VSI) is introduced, as voltage magnitude is an inadequate indicator to analyze voltage stability. Optimal place and size for different types of DGs is obtained in the proposed work by applying Particle swarm optimization (PSO). Feasibility of this work is tested and implemented on IEEE 33 and 69 bus Radial Distribution system (RDS).