Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Power fow decoupling method of triple-active-bridge converter for islanding mode operation in DC microgrid systems

  • Kwabena Opoku Bempah (Nanointech Research and Development Center) ;
  • Kyung‑Wook Heo (Department of Electrical Engineering, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Jee‑Hoon Jung (Department of Electrical Engineering, Ulsan National Institute of Science and Technology (UNIST))
  • Received : 2022.03.25
  • Accepted : 2022.09.15
  • Published : 2023.01.20
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Abstract

A single multiwinding transformer-based triple-active-bridge (TAB) converter with high power density is a viable candidate for DC microgrid development. However, it comes with a power fow challenge where all the ports are coupled. A power fow decoupling method is proposed for applications of the TAB converter in this paper. The method uses a combination of Proportional Integral (PI) controllers and a lookup table (LUT) that stores decoupling matrices for dynamic decoupling. The proposed decoupling method considers port voltage variations and utilizes only two control variables for voltage regulation. It is designed for application in the islanding mode operation of DC microgrids for DC bus voltage regulation. The feasibility and efectiveness of the proposed power fow decoupling method are verifed by simulations and experimental results using an implemented 2 kW TAB converter prototype. Finally, the proposed method shows a 98.95 and a 99.00% improvement in power decoupling according to load variations in the load port.

Keywords

Acknowledgement

This work was supported by the Energy Efciency and Resources of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) Grant through the Korea Government Ministry of Knowledge Economy under Grant (No. 20192010106750).

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