This work fits in the context of community microgrids, where entities of a community can exchange energy and services among themselves, without going through the usual channels of the public electricity grid. We introduce and analyze a framework to operate a community microgrid, and to share the resulting revenues and costs among the participating units. The proposed method ensures that the solution achieved by each entity within the community is not worse than the solution it would achieve by acting individually. As a consequence, each entity is naturally incentivized to participate in the community on a voluntary basis. The community microgrid operator, acting as a benevolent planner, redistributes revenues and costs among the entities, according to specific sharing policies. In this way, each entity can directly benefit from the community, thanks to the more efficient allocation of resources, the reduction of the peak power to be paid, and the increased amount of reserve, achieved at an aggregate level. An internal local market, implementing the marginal pricing scheme, is designed to determine the community prices. The proposed framework is formulated in the form of a bilevel model, where the lower level problem carries out the market clearing, while the upper level problem enforces the sharing policies among the entities of the community. Numerical results, based on both illustrative examples and a real test case, demonstrate the effectiveness of the proposed approach.
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