Robust Distributed Secondary Voltage Restoration Control of AC Microgrids under Multiple Communication Delays

This paper focuses on the robust distributed secondary voltage restoration control of AC microgrids (MGs) under multiple communication delays and nonlinear model uncertainties. The problem is addressed in a multi-agent fashion where generators’ local controllers play role cooperative agents communicating over network electrical couplings among generators are interpreted as disturbances to be rejected. Communications considered affected by heterogeneous network-induced time-varying with given upper-bounds MG subjected uncertainties abrupt changes operating working condition. Robustness against achieved means an integral sliding mode term embedded protocol. Then, global stability, despite delays, demonstrated through Lyapunov-Krasovskii analysis. Given delays’ bounds, because resulting stability conditions result being non-convex respect controller gain, then relaxed linear matrix inequalities-based tuning criteria developed maximize tuning, thus minimizing settling-time. By that, estimate maximal delay margin tolerated system also provided. Finally, simulations faithful model, showing effectiveness proposed strategy, further discussed.