Active Disturbance Rejection Controller Approach for Boost Converter in PV Application

A boost converter (BC) connects the PV modules and the inverter in a two-stage grid-integrated photovoltaic (PV) system. The interactions between the maximum power point tracking, BC, and inverter influence the system's performance. Active disturbance rejection control (ADRC) provides robustness against uncertainties and quick disturbance response. This paper explores Linear ADRC (LADRC) and Generalized ADRC (GADRC) to improve the PV system's transient response and track reference current from the MPPT controller under environmental and load disturbances, including grid frequency-induced sinusoidal perturbations. The GADRC method integrates any known plant information into the control system, whereas the LADRC method utilizes order and gain information. A dynamic model of the BC system is employed to extract plant information, including order and gain. Additionally, in the ADRC method, the extended state observer estimates the generalized disturbance and incorporates this estimation into the feedback control to quickly mitigate it. The dynamic performance of LADRC and GADRC for the BC system is assessed in terms of settling time, undershoot, overshoot, and steady-state oscillation across various operating conditions.