Abstract
DC microgrids (MGs) has obtained particular attention by increase of distributed renewable energies (DREs). In islanded dc MGs, adequate distributed generation (DG) is considered to supply loads of MGs autonomously according to the demand value. However, intermittency of DREs and loads may led to power shortage in the islanded dc MGs. Connecting dc MGs in a close vicinity and transferring power between them in order to backup each other, can be an applicable solution to cope with the power shortage. The MGs with the same voltage rating can be linked through dc lines, while the MGs with various voltage ratings should be connected to each other with isolated bidirectional full-bridge de-de power converters. In this paper, a central power sharing control scheme is proposed to manage power flow among connected de MGs with different voltage ratings. This control method shares the power among DGs proportionally. Moreover, the precise power sharing is obtained between MGs proportional to their ratings, too. The performance of the proposed control scheme is evaluated through simulation studies.
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