To meet the inertia requirements of different voltage levels and dynamic operating conditions
this paper proposes an inertial fusion control technology of multi-voltage-level DC microgrid. Initially
a model of a multi-voltage-level DC microgrid is established
and the inertia characteristics of various levels of DC systems are analyzed. Subsequently
aiming to maximize inertia in each system level
the paper considers the involvement of battery storage and renewable energy side converters connected to the system bus. These are engaged in inertia regulation through increased output current feed-forward control and grouped adaptive control. Meanwhile
the low-voltage side use inertia control based on observation compensation with converters connected to their load side to suppress fluctuations. This approach allows converters with inertia regulation capabilities to participate in the graded fusion of inertia in the DC microgrid and designs the inertia parameters for each end. Finally
a multi-voltage-level DC microgrid hardware-in-the-loop simulation platform is constructed to validate the effectiveness of this control strategy.
WANG P Y, ZHAO J F, LIU K L.Parameter-adaptation-based virtual DC motor control method for energy storage converter[J]. IEEE access, 2021, 9: 90795-90804.
YANG H Y, ZHANG N N.Multi-voltage grade bus control strategy based on load growth for DC microgrid[C]//2021 40th Chinese Control Conference (CCC). Shanghai, China, 2021: 5893-5898.
QIN J W, XIN Z J, DONG Z, et al.Cooperative control of DC microgrid cluster with different voltage levels[C]//2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG). Shanghai, China, 2023: 897-900.