A DCM-Based Non-Isolated Step-Down DC Transformer

Minseung Kim, Donghee Choi and Soo Hyoung Lee ()
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Minseung Kim: Department of Electrical Engineering, Mokpo National University, Muan 58554, Republic of Korea
Donghee Choi: Division of Converged Electronic Engineering, Cheongju University, Cheongju 28503, Republic of Korea
Soo Hyoung Lee: Division of Electrical, Electronic, and Control Engineering, Kongju National University, Cheonan 31080, Republic of Korea

Energies, 2024, vol. 17, issue 4, 1-13

Abstract: DC transformers have emerged as essential devices for medium voltage DC (MVDC)-low voltage DC (LVDC) distribution systems. However, conventional step-down single-level converters have limits on the voltage level of the MVDC-LVDC distribution system. This paper proposes a non-isolated step-down (NISD) DC transformer based on discontinuous conduction mode (DCM). The proposed structure can withstand high voltage levels by sharing voltages between energy storage modules dividing voltage levels. The proposed NISD DC transformer determines operational modes based on energy storage modules and performs the voltage conversion process. The effectiveness of the proposed NISD DC transformer is verified based on a case study using a power system computer-aided design and electromagnetic transient simulation engine including DC (PSCAD/EMTDC™).

Keywords: DC distribution; DC transformer; modular multilevel converter; non-isolated converter; step-down converter (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: 2024
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