Lyapunov law based model predictive control scheme for grid connected three phase three level neutral point clamped inverter

In this paper, Lyapunov law based model predictive control scheme is proposed for the grid integration of 3L-neutral point clamped (NPC) inverter. Lyapunov law based cost function, which aims to select the optimal voltage vector using system discrete model equations just once in each control cycle is able to reduce the current tracking error. Thus, low THD symmetrical current is injected to the utility grid and dc-link capacitor voltages are kept balanced at every operation. The proposed controller is convenient to control active/reactive power with desired power factor by system operator.