Nonlinear Robust Control of a Differential Boost Inverter Based on Disturbance Compensation and Additional Sliding-Mode Component

Abstract

This paper deals with the nonlinear robust PWM control of a DC/AC differential boost inverter based on dynamic feedback linearization, active disturbance rejection, and sliding mode control techniques. The inverter topology consists of two synchronous boost converters linked through a load resistance. The model of each boost converter is put in Brunovski’s canonical form through dynamic feedback linearization, defining an auxiliary input depending on the control variable in an affine mode and a nonlinear disturbance containing endogenous and exogenous variables. Each disturbance is estimated by an extended state observer and compensated through a control law designed for tracking the desired trajectory, according to the active disturbance rejection control technique. Finally, a sliding mode component is designed and added to the previous control law to assure the robustness of the closed loop system against uncertainties due to electric parameters, supply voltage and load resistance deviations, and disturbance estimation errors. Experimental results validate the proposed control methodology.