Joint Control of Three-Level DC-DC Converter Interfaced Hybrid Energy Storage System in DC Microgrids

Ujjal Manandhar, Benfei Wang, Xinan Zhang, Hoay Beng Gooi, Yitao Liu, Abhisek Ukil

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

A new three-level bidirectional DC-DC converter configuration for the battery and supercapacitor (SC) energy storage systems in DC microgrids is presented in this paper. The PI-based control method is implemented to operate the proposed converter with hybrid energy storage system. Furthermore, joint control is utilized to obtain rapid DC-link voltage restoration and effective power sharing between battery and SC based on their respective characteristics. The system operating principle, controller design, stability analysis, simulation studies and experimental studies are presented in this paper. The proposed three-level bidirectional DC-DC converter configuration can effectively integrate the battery and SC with the bidirectional power flow. The proposed control method provides the effective participation of the SC system which reduces the stress on the battery system. The presented converter configuration is effective in reducing the stress on the power semiconductors and provides better performance with smaller passive components. The experimental platform is built to test and validate the three-level bidirectional DC-DC converter and proposed control method for the HESS.

Original languageEnglish
Article number8805142
Pages (from-to)2248-2257
Number of pages10
JournalIEEE Transactions on Energy Conversion
Volume34
Issue number4
Early online date19 Aug 2019
DOIs
Publication statusPublished - Dec 2019

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