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Abstract-Integration of distributed generation (DG) units and shunt capacitors in the radial distribution networks is one of the effective options that can be used to improve the system voltage and reduce system losses. Optimal sizing and siting of DG units and shunt capacitors need to be ensured for strengthening the supply quality and reliability of distribution systems. In this regard, new analytical strategies need to be devised to minimise the computational burden and improve the overall accuracy of the solution. In this paper, a numerical method for the identification of the target voltage support zones is proposed by reducing the large search space. The strategic placement of DG units and shunt capacitors is proposed for overall voltage support and power loss reduction in a distribution feeder. The investment cost for DG units and shunt capacitors is minimised by using particle swarm optimisation (PSO) technique.

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The seamless integration of renewable distributed generation (DG) units into distribution system has become one of the most challenging research aspects in the recent years. The systematic deployment of renewable DG units can improve distribution system performance in terms of voltage support, loss minimisation, emission reduction, and reliability improvement. It is important to consider technical and economic incentives with the integration of renewable DG units. In this paper, a multi-objective distribution system expansion planning model with integration of renewable DG units is presented. It proposes comprehensive approach to address multiple conflicting objectives without loosing generality. A problemspecific particle swarm optimisation (PSO) based search method is used to solve the formulated planning problem. Scenario based studies are performed to examine the impacts of different DG allocations on system reliability and the investment cost of system reinforcement.