Stabilizing DC Microgrids: UNCS Observer & Controller

Reference Paper:

Lin, Pengfeng, Chuanlin Zhang, Jinyu Wang, Chi Jin, and Peng Wang. “On autonomous large-signal stabilization for islanded multibus DC microgrids: A uniform nonsmooth control scheme.” IEEE Transactions on Industrial Electronics 67, no. 6 (2019): 4600-4612.

—Different from single-bus dc microgrids (MGs), a multibus MG normally bridge multiple dc buses via a complex line impedance network. This intricate configuration together with tickling constant power loads may cause severe stability issues. For system stability improvement, conventional ways include designing small-signal stabilizers in a decentralized way and constructing large-signal
stabilizers by solving Lyapunov equation in a central controller. Note that centralized methods may be vulnerable to single point of failures, while decentralized patterns are commended to reinforce MG reliability and scalability. To implement large-signal stabilization in decentralized mechanisms, which has rarely been investigated in the existing literature, a novel uniform nonsmooth control scheme (UNCS) is proposed