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DC loads (such as computers, data centres, electric vehicle chargers, and LEDlamps) and dc distributed energy resources (such as fuel cells, solarphotovoltaics, and energy storages) are rapidly growing in electric powersystems, so dc systems are being introduced as emerging practical investmentsolutions compared to traditional ac options. DC microgrids offer severaladvantages such as the elimination of need for synchronizing generators andeasier supply of dc loads. Hybrid microgrids can benefit from the advantages ofboth ac and dc microgrid types. Moreover, there would be a huge reduction inthe number of required power converters which would enhance the microgridefficiency and reduce investment and operation costs. This paper introduceshybrid ac/dc microgrid as a viable solution compared to individual ac or dcmicrogrids and focuses on its planning. The objective of the hybrid microgridplanning is to minimize the microgrid total cost, including investment cost ofdistributed energy resources (DERs) and converters, operation cost of DERs, thecost of energy exchange with the utility grid, and the cost of unserved energyduring the planning horizon. The economic viability of the microgrid planningis investigated in this paper and it is shown how the optimal DER generationmix, the type of feeders, as well as the point of connection of DERs to feederscan be determined by updating the traditional ac microgrid planning model.Numerical simulations on a test microgrid exhibit the merits of the proposedmodel.

Optimal Design of Hybrid AC/DC Microgrids