1 kV, 10-kW SiC-Based Quadruple Active Bridge DCX Stage in a DC to Three-Phase AC Module for Medium-Voltage Grid Integration

Majmunovic, Branko; Mukherjee, Satyaki; Martin, Trent; Mallik, Rahul; Dutta, Soham; Seo, Gab-Su; Johnson, Brian; Maksimovic, Dragan

doi:10.1109/tpel.2022.3189966

1 kV, 10-kW SiC-Based Quadruple Active Bridge DCX Stage in a DC to Three-Phase AC Module for Medium-Voltage Grid Integration

Journal Article · Tue Jul 12 00:00:00 EDT 2022 · IEEE Transactions on Power Electronics

DOI:https://doi.org/10.1109/tpel.2022.3189966· OSTI ID:1907618

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University of Colorado, Boulder, CO (United States)
University of Washington, Seattle, WA (United States)
National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Interfacing low voltage dc to medium voltage three-phase ac grid is often based on series-stackable modular converter architectures. To minimize energy storage requirements, it is advantageous to employ a quadruple active bridge (QAB) stage operating as a "dc transformer" in each stackable module. The QAB stage offers three isolated dc link voltages, which then allow for flexible stacking of three single-phase dc-to-ac inverter stages. Each of the module phases processes a pulsating power having a component at twice the line frequency. This presents a challenge in maintaining zero voltage switching (ZVS) on the secondary sides of the QAB during low-power portions of the line cycle. This article is focused on the design of the QAB stage. A detailed analysis of ZVS switching waveforms is presented, including effects of nonlinear device capacitances. It is shown how ZVS can be achieved at all times using a relatively small circulating current provided by the magnetizing inductance of the high-frequency transformer. Analytical expressions are given for the optimal values of the magnetizing inductance and the dead times of the QAB primary and secondary bridges. This approach is verified by experimental results on a 1 kV, 10-kW SiC-based prototype, demonstrating a relatively flat efficiency curve with a peak efficiency of 97.1% at 75% load.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC36-08GO28308; EE0008346

OSTI ID:: 1907618

Alternate ID(s):: OSTI ID: 2283491

Report Number(s):: NREL/JA--5D00-83958; MainId:84731; UUID:6a1002ac-7f85-431a-a53a-0cb98d7a88ee; MainAdminID:68322

Journal Information:: IEEE Transactions on Power Electronics, Journal Name: IEEE Transactions on Power Electronics Journal Issue: 12 Vol. 37; ISSN 0885-8993

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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