Performance Of Three Phase Power Converter With Disturbance Attenuation Using Sliding Mode Control Approach

Abstract

A novel scheme for the control of three-phase two levelgrid-connected power converters is presented in this paper. A cascade-control structure, based on H∞ control and sliding mode control (SMC), is proposed, which simultaneously achieves output voltage regulation and unity power factor under dc-load variations. which comprises two control loops The overall  control strategy contains two main loops:first, a current tracking  loop (internal loop) based on sliding mode control that guarantees the input currents to follow the desired references; second, a dc-link voltage regulation loop (external loop) based on an H∞ controller integrated with an extended state observer (ESO), which regulates the output voltage and provides current references for the internal loop. an H∞ controller plus an ESO, which is designed to regulate dc-link capacitor voltage of the converter and asymptotically reject external disturbances and parameter perturbations Simulation results are provided to assess the efficiency of the proposed method.