Optimized active disturbance rejection control for DC-DC buck converters with uncertainties using a reduced-order GPI observer

摘要

The output voltage regulation problem of a PWM-udbased DC-DC buck converter under various sources of uncertain-udties and disturbances is investigated in this paper via an optimizedudactive disturbance rejection control (ADRC) approach. Aimingudto practical implementation, a new reduced-order generalizedudproportional integral (GPI) observer is first designed to estimateudthe lumped (possibly time-varying) disturbances within the DC-udDC circuit. By integrating the disturbance estimation informationudraised by the reduced-order GPI observer (GPIO) into the outputudprediction, an optimized ADRC method is developed to achieveudoptimized tracking performance even in the presence of distur-udbances and uncertainties. It is shown that the proposed controllerudwill guarantee the rigorous stability of closed-loop system, for anyudbounded uncertainties of the circuit, by appropriately choosingudthe observer gains and the bandwidthfactor. Experimental resultsudillustrate that the proposed control solution is characterised byudimproved robustness performance against various disturbancesudand uncertainties compared to traditional ADRC and integraludMPC approaches.