Volume 60

Decentralized Virtual Inertial and Damping Control of Multi-bus DC Microgrid Xuecheng Li, Changbin Hu, Shanna Luo, Gaowei Wang, Xuebin Li, Dawei Qi

Abstract

Virtual Inertia Damping Control (VID-Control) is aneffective method to improve the inertia and damping ofDC microgrids. However, unreasonable design ofadditional inertia (J) and damping (D)parameters willlead to severe system oscillations or even instability. Toaddress this issue, this paper proposes a VID-Controlstrategy for multi-bus DC microgrids based on anextended observer. Leveraging Lyapunov stabilitytheory, this strategy enables the decentralized design ofvirtual inertia, damping and the low-level fast voltagecontrol. It does not require measurements of theconverter’s own output current or parameters of otherconverters. This not only realizes decentralized controldesign of VID-Control in multi-bus DC microgrids but alsoreduces the cost of output current sensors whileenhancing the system’s inertia and damping. Theeffectiveness of the proposed method is verified throughsimulations of multi-DC buck converter system.

Keywords DC Microgrid, Virtual Inertia and DampingControl, Lyapunov stability, DC-DC converter, buckconverter, Disturbance Observer