Microgrids are often made up with Hybrid Power Plants (HPPs), which include storage batteries. To enhance system efficiency, it is important to manage the batteries so as to avoid that one gets charged at other batteries' expense. To reduce costs and increase robustness, a Microgrid Controller that communicates with all the HPPs can be avoided and the droop control is often adopted for the HPPs' interface inverters. This paper proposes a method to change the droop coefficients so as to get the described target with no communication available between the HPPs. Theoretical analysis is validated through a simulation carried out on a study case. Keywords-Microgrids, hybrid power plant, battery management, droop control.

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This paper explores the coordinated strategy named Power-Based Control to properly coordinate gridtied single-and three-phase distributed energy resources in three-phase three-wire microgrids. By means of a narrowband, low data rate communication, such strategy accommodates current-and voltage-controlled distributed inverters providing proportional sharing of active, reactive and unbalance (negative-sequence) power terms, also offering dispatchable power flow and high power quality at the microgrid's point of common coupling. Regarding the current unbalance compensation, a particular case considering two distributed single-phase inverters is discussed through mathematical analysis in terms of balanced and unbalanced power terms, and experimental results on which the Power-Based Control is applied to demonstrate that this strategy corroborates with Steinmetz principle. Finally, the complete strategy is evaluated in simulation considering the model of a real urban power distribution grid under typical operational conditions.

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This paper proposes a fully decentralized control approach, based on AC bus signaling, to integrate the operation of voltage-and current-controlled converters that exist in an isolated low-voltage microgrid, so they may be fully steered under grid-feeding, grid-supporting, and grid-forming control principles. The proposed strategy, devised by classic and modified droop-based controllers, allows control of the microgrid active power relating to the system frequency, while regulating the reactive power related to the voltage, dispensing any need for communication infrastructures. Beyond ensuring proper microgrid power balance at all times, the control strategy prioritizes energy extraction from non-dispatchable sources (i.e., photovoltaicbased systems), whereas it uses dispatchable sources (i.e., battery-based systems) to share active and reactive power proportionally to their capabilities. As a consequence of the proper and novel management of battery-based converters, battery overvoltage and overcurrent are avoided, supporting a prolonged lifespan. Simulation results considering an autonomous microgrid operating under several scenarios are presented, to demonstrate the capabilities of the proposed control scheme on steering the different topologies of converters. INDEX TERMS Battery energy storage systems, decentralized control, distributed generation, microgrids, power control.

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