Standalone ESS modeling and dual-loop control using Zn-Br Redox flow battery

Author

Jung-Muk Choe ; Younghoon Cho ; Gyu-Ha Choe

Author_Institution

Dept. of Electr. Eng., Konkuk Univ., Seoul, South Korea

fYear

2014

fDate

14-18 Sept. 2014

Firstpage

5317

Lastpage

5322

Abstract

This paper proposes an ESS DC-DC Converter using Redox Flow Battery (RFB) for stand-alone microgrid applications. Price, safety, expandability and dynamics are crucial in ESS. Reports show that Zinc-bromine (ZnBr) RFB is the best choice in ESS. A simple electrical ZnBr RFB model is obtained from charging tests. A DC-DC converter Inductor current-DClink Voltage model is proposed for the DC microgrid. For the controller design in z-domain, the K-factor method is utilized while considering the nature of the digital controller. The control performance has been verified with simulation and hardware experiments. Lastly, a 10kW DC microgrid using RFB test result is shown.

Keywords

DC-DC power convertors; bromine; control system synthesis; digital control; distributed power generation; inductors; secondary cells; zinc; DC link voltage model; ESS DC-DC converter; K-factor method; Zn-Br; digital controller; dual-loop control; energy storage system; inductor current; power 10 kW; redox flow battery; standalone DC microgrid application; z-domain; zinc-bromine RFB model; Batteries; DC-DC power converters; Integrated circuit modeling; Mathematical model; Microgrids; Resistors; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Congress and Exposition (ECCE), 2014 IEEE

Conference_Location

Pittsburgh, PA

Type

conf

DOI

10.1109/ECCE.2014.6954130

Filename

6954130