This article exhibits an output voltage-derivative observer-based output voltage-tracking technique for dc/dc boost converters without current feedback, taking the model-plant mismatches (caused by parameter and load variations) and model nonlinearity into consideration. In contrast to extant passivity-based approaches, the proposed solution includes observers to estimate the output voltage derivative and does not require exact model information, which offers a few features: converter parameter information-free output voltage-derivative observers including the modified disturbance observation algorithm for improving the high-frequency disturbance rejection capability as a replacement of the estimation error integral actions, and the observer-based output voltage and its derivative error stabilizer with a damping adaptation mechanism assigning the desired energy function to the closed-loop system. Experimental verification is provided to demonstrate the practical advantages of the proposed solution using a 3-kW bidirectional converter.
This work was supported in part by the National Research Foundation of Korea, Korea government (Ministry of Science and ICT) under Grant NRF-2021R1C1C1004380, in part by the Basic Science Research Program through the National Research Foundation of Korea, Ministry of Education, under Grant 2018R1A6A1A03026005, and in part by the Korea Electric Power Corporation
