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Single Active Bridge DC/DC Converter as Auxiliary Power Supply for Medium-Voltage Multilevel Converters
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| Author(s) |
Patrick LENZEN, Martin PFOST |
| Abstract |
Modular multilevel converters are used in various applications such as HVDC, STATCOM or PV. A robust auxiliary power supply is essential to ensure full control of each stage at all times, even during failure scenarios. Due to the high voltage between the cell and the external input power, high isolation is required. This paper presents a Single Active Bridge (SAB) auxiliary power supply for MMCs. The proposed design achieves high isolation and is capable of powering more than 100 MMC cells simultaneously. The high stray inductance resulting from the isolation distance can be included in the converter design. The system can handle asymmetric load changes of up to 24\% on a single stage without causing overvoltage conditions. Furthermore, a novel solution is presented to address highly asymmetrical load scenarios. |
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| Filename: | 0242-epe2025-full-17392428.pdf |
| Filesize: | 488.6 KB |
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| Type |
Members Only |
| Date |
Last modified 2025-08-31 by System |
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