Journal
2023 IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION, APEC
Volume -, Issue -, Pages 2333-2339Publisher
IEEE
DOI: 10.1109/APEC43580.2023.10131325
Keywords
Auxiliary power supply; high step-down; CT-based auxiliary power supply; pre-charge circuit; discharge circuit; mini-UPS; medium voltage converter
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This paper highlights the significance of the auxiliary power supply system in modular medium voltage SiC-based conversion systems and presents a system consisting of five individual converters to meet the requirements of high insulation capability, low common-mode coupling capacitance, high reliability, and a simple structure with a small converter size.
The design of the auxiliary power supply system is critical in modular medium voltage SiC-based conversion systems. Usually, high insulation capability, low common-mode coupling capacitance, high reliability, and a simple structure with a small converter size are preferred. To satisfy all requirements, this paper presents an auxiliary power supply system that is constructed by five individual converters including a high step-down converter, current-transformer-based auxiliary power supply, pre-charge circuit, discharge circuit, and mini-UPS. The operating sequence of the auxiliary power supply system as well as the standalone introduction of each converter are presented. Then, the hardware prototypes are developed and verified by the tests.
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