A Power Self-Balanced High Step-Down Medium Voltage DC Converter With Expandable Soft-Switching Range

This article proposed a power self-balanced high step-down medium voltage dc converter with expandable soft-switching range. The proposed one features the input voltage self-balance of each submodule and the current self-balance of each mosfet , due to the submodules transmitting the same power thro...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2024-01, Vol.71 (1), p.398-408
Main Authors: Guan, Renfeng, He, Zhixing, Fang, Lingqing, Qin, Junjie, Li, Zongjian, Xu, Qianming, Chen, Yandong
Format: Article
Language:English
Subjects:
Auxiliary power units
Capacitors
DC power transmission
Electric potential
Electric power supplies
Expandable soft switching
high step-down ratio
Inductance
Inductors
Medium voltage
medium voltage dc (MVdc)
power self-balance
Power supplies
Power supply
Power transformer insulation
Soft switching
Switches
Switching
Topology
Transformers
Voltage
Voltage control
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Summary:This article proposed a power self-balanced high step-down medium voltage dc converter with expandable soft-switching range. The proposed one features the input voltage self-balance of each submodule and the current self-balance of each mosfet , due to the submodules transmitting the same power through LC -coupled branches. The LC -coupled branch provides multiple direct ac power paths from medium voltage input to load, eliminating the losses caused by conventional multistage transmission. Each submodule of the proposed converter is a soft-switching unit that uses an auxiliary inductor to achieve soft switching, which reduces the resonant current and facilitates the expansion of the number of modules, without redesigning the transformer, instead of the conventional resonant converter that reduces the transformer magnetizing inductance to achieve soft-switching. Moreover, an auxiliary power supply scheme for the proposed converter is provided, which is used to solve the problem of difficult startup of the medium voltage dc converter, where the negative impedance characteristics of the series-connected auxiliary power supply are suppressed without the need for lossy voltage sharing resistors. A prototype with 1 kV dc input and 100 V/1 kW output is built to verify the feasibility of the proposed topology.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2023.3245201