Event-triggered control of power buffers in DC microgrids over an unreliable network

Power buffers can help improve the inertia in DC microgrids and supply the additional power demand during short load transients. This article investigates distributed event-triggered control of power buffers over an unreliable network, subject to packet losses and transmission delays. For each power buffer, a distributed event-triggered control law regulates the input impedance while altering its stored energy. Moreover, a dynamic event-triggered communication mechanism determines the time sequence of control updates and data transmissions among power buffers. An appealing feature of this mechanism is a designable positive minimum inter-event time despite packet losses and transmission delays. The closed-loop system is shown to be exponentially stable. Controller/hardware-in-the-loop studies validate the theoretical findings.