The increase in demand for clean, safe, and environmentally friendly renewable energy\nsources faces several challenges such as system design and reliable operations. DC microgrid (MG)\nis a promising system due to higher efficiency and natural interface to renewable sources. In the\nhierarchical control of DC Microgrid, the V-I droop control is deployed usually in primary control\nlevel for common load sharing between converters. However, conventional droop control causes\nimproper current sharing, voltage variations, and circulating current regulation due to the presence of\ndroop and line resistance between converters. The aim of this paper is to presents the primary control\nlevel design of buck converters in current mode control according to the concepts of time constant and\ntime delay, and secondary control design for parallel operations in distributed manners by combining\nmethods, namely, low bandwidth communication (LBC), circulating current minimization techniques,\nand average voltage/current control. Moreover, different time delays are used for two converters to\ntestify the effects of communication delays on current sharing and voltage restoration. The simulation\nis done for 2 * 2.5 KWdc parallel buck converters in PLECS (a Simulation software used for high\nspeed simulation for power electronics) environment which shows excellent results in minimizing\ncirculation currents, enhancing proportional current sharing, and restoring the grid voltage.
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