This study proposes an observer-based multiloop output-feedback system that regulates the output dc-link voltage of dc/dc converters to the desired value to lower the system model dependence level. There are a few features: 1) the outer loop injecting the nonlinear active damping to ensure the critically damped output voltage response; 2) a model-independent output voltage derivative observer facilitates the inner loop and eliminates the need for complex matrix calculations for tuning the estimation performance; and 3) the use of a pole-zero cancellation acceleration error stabilizer for the inner loop helps maintain the targeted closed-loop performance. The experimental study adopts a 420-W brushless dc motor dynamo system as the load for the prototype 600-W bidirectional converter controlled using the proposed solution.
Bibliographical noteFunding Information:
This work was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (Ministry of Science and ICT) under Grant NRF-2021R1C1C1004380 and Grant NRF-2020R1A2C1005449), and in part by the Technology Innovation Program funded By the Ministry of Trade, Industry & Energy(MOTIE, Korea) under Grant 20009017.
© 1982-2012 IEEE.
- Critical damping
- current sensor-free
- dc/dc converter
- output-feedback system
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Control and Systems Engineering