Decentralized Virtual Inertial and Damping Control of Multi-bus DC Microgrid

Virtual Inertia Damping Control (VID-Control) is an effective method to improve the inertia and damping of DC microgrids.However, unreasonable design of additional inertia (J) and damping (D)parameters will lead to severe system oscillations or even instability.To address this issue, this paper proposes a VID-Control strategy for multi-bus DC microgrids based on an extended observer.Leveraging Lyapunov stability theory, this strategy enables the decentralized design of virtual inertia, damping and the low-level fast voltage control.It does not require measurements of the converter's own output current or parameters of other converters.This not only realizes decentralized control design of VID-Control in multi-bus DC microgrids but also reduces the cost of output current sensors while enhancing the system's inertia and damping.The effectiveness of the proposed method is verified through simulations of multi-DC buck converter system.