Sliding-mode control of a three-level NPC grid-connected inverter

Abstract

In this chapter, a super-twisting SMC (STSMC) will be used to control a three-phase natural clamped point (NPC) inverter with LCL filter. The main objective is to ensure a regulated output AC current with a low Total Harmonic Distortion (THD) value. MATLAB®/Simulink® is used to show the effectiveness of the STSMC strategy. The benefits of the proposed control strategy can be summarized as compliance with the standards imposed by the electrical grid managers without the use of onerous filters at the output of the NPC inverter. Furthermore, the proposed control strategy exhibits an accurate tracking response with low THD of the injected currents while ensuring grid voltage synchronization.