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Volume 19
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Article

Modular, Multiport AC-DC Converter with Add-On HF Isolating Units

by
Pawel B. Derkacz
1,*,
Pawel Milewski
1,
Daniel Wojciechowski
2,
Natalia Strzelecka
3 and
Ryszard Strzelecki
3
1
Arex—(WB Group), Hutnicza 3, 81-212 Gdynia, Poland
2
Faculty of Electrical and Control Engineering, Gdańsk University of Technology, 80-233 Gdańsk, Poland
3
Faculty of Electrical Engineering, Gdynia Maritime University, 81-225 Gdynia, Poland
*
Author to whom correspondence should be addressed.
Energies 2026, 19(1), 85; https://doi.org/10.3390/en19010085
Submission received: 15 November 2025 / Revised: 11 December 2025 / Accepted: 13 December 2025 / Published: 23 December 2025
(This article belongs to the Section F3: Power Electronics)
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Abstract

In this paper, we propose a novel concept of a modular, multiport, single-stage, bidirectional, isolated, three-phase AC-DC converter system. This new system is realized using add-ons to a standard voltage source inverter, including both grid-connected AC-DC converters, like PWM rectifiers, and AC-drive DC-AC inverters. The proposed add-on converters provide isolated DC ports and can be installed into existing inverters of the abovementioned types, with no need for any modification of their topology or control system. Moreover, the add-on converters provide a minimum transistor count and high efficiency. The efficiency of the proposed add-on converters can be further improved by switching the type of pulse width modulation (PWM) scheme based on their operating point. The proposed converter system is validated for a power of 20 kW, an output voltage of 500–800 V DC, and a 40 kHz PWM frequency.
Keywords: AC-DC power converters; DC-DC power converters; digital control; pulse width modulation converters AC-DC power converters; DC-DC power converters; digital control; pulse width modulation converters

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MDPI and ACS Style

Derkacz, P.B.; Milewski, P.; Wojciechowski, D.; Strzelecka, N.; Strzelecki, R. Modular, Multiport AC-DC Converter with Add-On HF Isolating Units. Energies 2026, 19, 85. https://doi.org/10.3390/en19010085

AMA Style

Derkacz PB, Milewski P, Wojciechowski D, Strzelecka N, Strzelecki R. Modular, Multiport AC-DC Converter with Add-On HF Isolating Units. Energies. 2026; 19(1):85. https://doi.org/10.3390/en19010085

Chicago/Turabian Style

Derkacz, Pawel B., Pawel Milewski, Daniel Wojciechowski, Natalia Strzelecka, and Ryszard Strzelecki. 2026. "Modular, Multiport AC-DC Converter with Add-On HF Isolating Units" Energies 19, no. 1: 85. https://doi.org/10.3390/en19010085

APA Style

Derkacz, P. B., Milewski, P., Wojciechowski, D., Strzelecka, N., & Strzelecki, R. (2026). Modular, Multiport AC-DC Converter with Add-On HF Isolating Units. Energies, 19(1), 85. https://doi.org/10.3390/en19010085

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