Analysis and Design of Coupled Inductor for Interleaved Buck-Type Voltage Balancer in Bipolar DC Microgrid

Jung-min Park, Hyung-jun Byun, Bum-jun Kim, Sung-hun Kim and Chung-yuen Won
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Jung-min Park: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
Hyung-jun Byun: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
Bum-jun Kim: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
Sung-hun Kim: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
Chung-yuen Won: Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea

Energies, 2020, vol. 13, issue 11, 1-16

Abstract: A voltage balancer (VB) can be used to balance voltages under load unbalance in either a bipolar DC microgrid or LVDC (Low voltage DC) distribution system. An interleaved buck-type VB has advantages over other voltage balance topologies for reduction in output current ripple by an aspect of configuration of a physically symmetrical structure. Similarly, magnetic coupling such as winding two or more magnetic components into a single magnetic component can be selected to enhance the power density and dynamic response. In order to achieve these advantages in a VB, this paper proposes a VB with a coupled inductor (CI) as a substitute for inductors in a two-stage interleaved buck-type VB circuit. Based on patterns of switch poles under load variation, the variation in inductor currents under four switching patterns is induced. The proposed CI is derived from self-inductance based on the configuration structure that has a two-stage interleaved buck type and mathematical design results based on the coupling coefficient, where the coupling coefficient is a key factor in the determination of the dynamic response of the proposed VB in load variation. According to the results, a prototype scale is implemented to confirm the feasibility and effectiveness of the proposed VB.

Keywords: voltage balancer; coupled inductor; bipolar DC microgrid; interleaved-type DC–DC converter; LVDC distribution system (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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