MULTI OBJECTIVE OPTIMAL SITING AND SIZING OF INVERTER BASED DISTRIBUTED GENERATION UNITS CONSIDERING HARMONIC LIMITS IN

Abstract — Distributed generation units (DGs), small generating units connected directly to the distribution networks are recently in growing attention as a solution to environmental and economical challenges caused by conventional power plants. In this study, a multi-objective framework is proposed for optimal placement and sizing of inverter based distributed generation units in meshed electric power system. The objective functions include maximizing the penetration level as well as minimizing power losses and total harmonic distortion subjected to various constraints such as power balance equations, bus voltage limits, individual harmonic distortion limit specified by IEEE-519 standard.. The DG penetration level could be limited by harmonic distortion because of the non linear current injected by inverter based DG units. This study is formulated as a nonlinear programming problem and tested on the IEEE-14 bus meshed distribution system with different DG scenarios. The problem is solved using particle swarm optimization algorithm due to its nonlinear and non convex nature. Simulation results show the effectiveness o the proposed approach. The best results have been obtained and is plotted and graphed