Sliding Mode Control of a Three-Phase Inverter with an Output LC Filter

This paper presents a Sliding Mode Control of the output voltage in a three-phase inverter with LC filter. The controller objective is to ensure a regulated output AC voltage with small Total Harmonic Distortion (THD) value in the presence of a nonlinear load. The controller principle is to dispose of the existing coupling between the control inputs by considering the voltage difference between the input and the output neutral points as an unknown disturbance. Then, a robust sliding mode controller is designed to track the voltage references regardless of the disturbance. The simulation results performed through Matlab/Simulink illustrates the very good performances of the proposed controller.