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This paper presents a microgrid planning model for determining the optimal size and the generation mix of distributed energy resources (DERs), as well as the microgrid type, i.e., ac or dc. Considering the growing ratio of dc loads and DERs, dc microgrids could be potentially more beneficial than ac microgrids by avoiding the need to synchronize generators, reducing the use of converters, facilitating the connection of various types of DERs and loads to the microgrid common bus with simplified interfaces, and reducing losses associated with the ac-dc energy conversion. The microgrid type is selected based on economic considerations, where the planning objective includes the investment and operation costs of DERs, cost of energy purchase from the main grid, and the reliability cost. Numerical simulations exhibit the effectiveness of the proposed model and investigate in detail the impact of variety of factors on …