Design and Line Fault Protection Scheme of a DC Microgrid Based on Battery Energy Storage System

Abdul Motin Howlader, Hidehito Matayoshi, Saeed Sepasi and Tomonobu Senjyu
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Abdul Motin Howlader: Hawaii Natural Energy Institute, University of Hawaii, Manoa, 1860 East-West Road, Honolulu, HI 96822, USA
Hidehito Matayoshi: Faculty of Engineering, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Nakagami, Okinawa 903-0213, Japan
Saeed Sepasi: Hawaii Natural Energy Institute, University of Hawaii, Manoa, 1860 East-West Road, Honolulu, HI 96822, USA
Tomonobu Senjyu: Faculty of Engineering, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Nakagami, Okinawa 903-0213, Japan

Energies, 2018, vol. 11, issue 7, 1-22

Abstract: Currently, the Direct-Current (DC) microgrid has been gaining popularity because most electronics devices require a DC power input. A DC microgrid can significantly reduce the AC to DC energy conversion loss. However, a power grid may experience a line fault situation that may damage important household devices and cause a blackout in the power system. This work proposes a new line fault protection scheme for a DC microgrid system by using a battery energy storage system (BESS). Nowadays, the BESS is one of the most cost effective energy storage technologies for power system applications. The proposed system is designed from a distributed wind farm smart grid. A total of three off-shore wind farms provide power to the grid through a high voltage DC (HVDC) transmission line. The DC microgrid was modeled by a BESS with a bi-directional DC–DC converter, various DC-loads with step down DC–DC converters, a voltage source converter, and a voltage source inverter. Details of the control strategies of the DC microgrid are described. During the line fault situation, a transient voltage was controlled by a BESS. From the simulation analyses, it is confirmed that the proposed method can supply stable power to the DC grid, which can also ensure protection of several loads of the DC microgrid. The effectiveness of the proposed system is verified by in a MATLAB/SIMULINK ® environment.

Keywords: DC microgrid; smart grid; wind farm; HVDC; DC load; battery energy storage; line fault (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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