Optimal placement and sizing of DG units and capacitors simultaneously in radial distribution networks based on the voltage stability security margin

This paper presents a novel manner to reach the optimal quantity, placement, and sizing for distributed generation (DG) units and capacitors simultaneously in a radial distribution network as a multiobjective optimization problem. The objective function includes the DG units’ and capacitors’ costs, power losses, and voltage stability margins as a multiobjective optimization problem, which uses a developed genetic algorithm as the first stage in the proposed hierarchical optimization strategy. In order to model the optimization problem, different types of DG units are modeled and the results are investigated and evaluated on an IEEE-33 bus radial distribution network.

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