2021 article
Adaptive Nonlinear Droop Control with Dynamic State-of-Charge Balancing Capability for Batteries in DC Microgrids
2021 THIRTY-SIXTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2021), pp. 55β61.
Droop control is one of the generally accepted methods for interfacing various voltage sources in a dc microgrid that could deal with challenges such as load-sharing accuracy and dc voltage regulation among the sources. This paper proposes a novel adaptive nonlinear droop control method based on dynamic state-of-charge (SOC) balancing of battery energy storage systems (BESSs) and the converters' output current in a dc microgrid. In this decentralized communication-less method, the BESS with higher SOC delivers more power with the minimum trade-off between the voltage regulation and current-sharing accuracy. The simulation and Hardware-in-the-loop (HIL) testbed results verify the stability and load-sharing, and voltage regulation capability of the proposed controller technique compared to other nonlinear and adaptive droop methods.