Precise feedback decoupling control of a three-level Buck converter based on a pre-filter

Authors

Xin FAN, School of Physics and Electronic Information, Guangxi Minzu University, Nanning 530006, China
Jiarong WU, School of Physics and Electronic Information, Guangxi Minzu University, Nanning 530006, ChinaFollow
Lin YANG, School of Physics and Electronic Information, Guangxi Minzu University, Nanning 530006, China
Weilin WU, School of Physics and Electronic Information, Guangxi Minzu University, Nanning 530006, China

Keywords

three-level; Buck converter; decoupling control; pre-filter

Abstract

To improve the stability performance of a three-level Buck converter, a precise feedback decoupling control strategy based on a pre-filter is proposed.The mathematical model of the three-level Buck converter is established, and the reversibility analysis of the model is carried out based on the inverse system theory.The original model is linearly decoupled into two pseudolinear subsystems.The proportional-integral controller and the optimal controller are designed for the two subsystems, respectively to improve the performance of the system and suppress the influence of external disturbances on the system.Then, the pre-filter is designed to eliminate the adverse effects of the closed-loop zero point.Simulation and experimental results show that compared with the existing control methods, the proposed control strategy has faster response speed, better stability, and stronger robustness.

DOI

10.19781/j.issn.1673-9140.2025.05.022

First Page

237

Last Page

245

Recommended Citation

FAN, Xin; WU, Jiarong; YANG, Lin; and WU, Weilin (2025) "Precise feedback decoupling control of a three-level Buck converter based on a pre-filter," Journal of Electric Power Science and Technology: Vol. 40: Iss. 5, Article 22.
DOI: 10.19781/j.issn.1673-9140.2025.05.022
Available at: https://jepst.researchcommons.org/journal/vol40/iss5/22