Optimal placement of distributed generation in distribution network to minimize the real power loss and improvement in voltage profile of the system. An analytical method and the application of particle swarm optimization (PSO) technique have been proposed for optimal placement of DGs to minimize the system losses, improvement in voltage profile and maximization of benefits. The optimal placement of different types of DGs i.e., type-I DG, type-II DG, type-III DG and type-IV DG in the distribution system have given due consideration. A hybrid approach has been developed for optimal placement...