Offset-Free Model Predictive Control of Interleaved Boost Converter Based on Extended State Observer

The conventional model predictive control (MPC) suffers from non-zero steady-state errors, due to the inevitable model mismatch and unknown disturbances. To this end, in this paper, an offset-free MPC algorithm based on extended state observer (ESO) is proposed and then applied to the current control of the interleaved boost converter. First, the influence of the main model parameter mismatch and the input voltage and load resistance disturbance on the MPC is studied. Then, the unmodeled part of the system and external disturbances are regarded as the lumped disturbance, which is estimated by ESO and then compensated in the prediction model. In this way, the offset-free MPC can be realized. Finally, the simulation results verify the effectiveness of the proposed method.