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Three-Level Circulant Modulation With Submodule-Capacitor Voltage Natural-Balance Capability for Bidirectional Modular DC-DC Converter
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DOI：10.1109/JESTIE.2025.3647033.png)
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Abstract
En 中文
A three-level duty-cycle phase-shift circulant modulation with submodule (SM) voltage natural balancing for a bidirectional modular dc-dc converter is proposed in this article. Compared with the conventional single-phase-shift circulant modulation to achieve capacitor voltage balance in SMs, the proposed duty-cycle phase-shift circulant modulation method offers advantages, such as lower current stress and voltage change rate (dv/dt) along with voltage natural balancing. Furthermore, circulant modulation enables a highly flexible voltage conversion ratio while inherently achieving natural balancing of SM-capacitor voltages, without additional feedback control. In addition, the low switching frequency operation of SMs, combined with a high operational frequency, facilitates a significant reduction in the size of passive components, thereby enhancing system efficiency and compactness. This article presents the working principle and theoretical analysis of the converter in detail, followed by experimental validation based on a hardware prototype built and tested in the laboratory.
Keywords:
Voltage control
Capacitors
Phase modulation
Topology
Voltage
Transformers
DC-DC power converters
Load flow
Bridge circuits
Switches
Bidirectional modular dc-dc (BiMDC) converter
duty-cycle phase-shift circulant modulation
medium-voltage
natural-balancing capability
Journal
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Papers:
138
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0
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Cited Papers