Abstract
Microgrids provide a good platform to improve the efficiency of distribution networks. This platform, which is owned by the private sector, needs coordination with the distribution network owner in order to carry out its mission in the fields of operation and expansion planning. The distribution network expansion decisions are influenced by the expansion of microgrids. Therefore, the main issue that needs to be addressed is how expansion decisions interact with distribution networks and microgrids. This paper proposes a new framework for studying the interactions between resources and lines expansion in microgrids, and distribution network expansion. The proposed model is designed as a bi-level optimization problem. In the upper-level, with the aim of maximizing the profit of the microgrid owner, optimal decisions on distributed resources (location and sizes) and lines expansion are adopted. The lower-level problem involves the distribution network problem, in which, with the aim of minimizing the expansion and operation costs, energy exchanged with the microgrid and the upstream network, and the lines expansion of distribution network, are determined. Due to the non-convexity of both the upper and lower-level problems, a combination of evolutionary and mathematical algorithms is used to solve the proposed model. The study results on the IEEE 33-bus network using proposed framework show that the presence of a microgrid structure in the distribution network expansion planning helps to improve operation conditions and encourage investor participation in the power system. • A new framework for the interaction between DGs and lines expansion in MGs, and DN. • A bi-level framework for interactive simultaneous expansion planning of DN and MG. • Considering the DG expansion and supply lines expansion in the MG, simultaneously.
Published Version
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