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SummaryStandalone DC microgrids are progressively becoming explored in the modern power system. Proper voltage regulation and effective power distribution among sources are the main challenges for DC microgrid operation. A supervisory coordinated control strategy for proportionate power‐sharing and enhanced voltage regulation is presented in this paper to overcome these challenges. The formation of multiple power pools on the basis of available power from each renewable energy source (RES) is a crucial element of this approach. It modifies the power sharing between power pools and individual sources based on the amount of power available in the sources. In addition, for effective power management, it coordinates the operation of all power pools with all RESs. Also, by reducing the charging and discharging cycle of energy storage systems (ESSs), it is possible to make effective use of ESSs. The proposed control adapts to intermittent RESs and changes in the microgrid network. The proposed method's capabilities are validated by experimental results.

The available power is not always constant in renewable energy sources (RESs). It varies depending on the environmental conditions and time interval. These raise the problems of mismatch in power-sharing among the RESs and bus voltage regulation. The novelty of this article is that it presents a new control scheme for a multibus DC microgrid, in which it improves voltage regulation at the load bus under different network topologies and various system operating conditions. The proposed control method achieves adequate power-sharing proportional to the available power in RESs connected to the DC microgrid. Therefore, it accomplishes effectual power management and reduces the burden on the energy storage system (ESS) in the DC microgrids. It adapts to the inclusion and removal of sources under different network topologies. This control scheme is tested experimentally for various network topologies under diverse operating conditions. The results prove the feasibility of the proposed method.INDEX TERMS Availability index, multibus DC microgrid, network topology, power management, voltage regulation.

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