DC Microgrids are advantageous solutions for integrating renewable energy sources. Existing control methods rely on communication, which can be unreliable. To address this, a novel State-of-Grid (SoG) based control is proposed. In order to address this challenge, after defining the notion of State-ofGrid (SoG), the present paper introduces a novel SoG based control for DC Microgrids. The proposed approach ensures a communication-free operation of DC Microgrids, capable of power and load sharing while balancing the State-of-Charge (SoC) of each Energy Storage System (ESS). In this SoG based control, the ESS converters are fully decentralized controlled to map the SoC of each BESS into a corresponding output voltage range. This streamlined approach significantly simplifies SoC equalization and power-sharing without necessitating dedicated communication infrastructure. The proposed approach encompasses both the AC-coupled mode and the islanded mode. Moreover, through this SoG based control, completely communicationfree balancing of the SoCs throughout AC and DC Microgrids is achieved. The proposed approach is implemented and validated using a DC Microgrid experimental setup comprising two ESS, Photovoltaic (PV) arrays, multiple loads at different voltage levels, and a DC-AC interlink converter allowing power exchange with an AC Grid. Both islanded and AC-coupled mode experiments are examined.

The increasing integration of inverter-based components into the grid has necessitated the development of enhanced control strategies to maintain grid reliability. Beyond the traditional control provided by inverter-based resources, there is a growing interest in the potential of power electronics interfaced loads to participate in primary control, referred to as Grid Supporting Load (GSL). This paper introduces a novel control approach that equips inverter-based loads in low-voltage DC Microgrid with grid support capabilities, relying solely on local measurements. The proposed method offers a generalized solution for a variety of loads, including constant impedance (Z), constant current (I), and constant power (P) loads, collectively known as ZIP loads. The proposed GSL is experimentally tested and validated in a real-world DC Microgrid setup. Compared to conventional proportional-integral control methods, the proposed GSL method significantly improves voltage regulation, addressing bus voltage drops and enhancing the reliability of DC Microgrid operations.