4.7 Article

Insulation Design of Wireless Auxiliary Power Supply for Medium Voltage Converters

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JESTPE.2020.3011075

关键词

Insulation; Wires; Shape; Periodic structures; Solids; Power supplies; Transmitters; Auxiliary power supply (APS); insulation design and assessment; medium voltage (MV) converter; optimization; partial discharge (PD); wireless power transfer (WPT)

资金

  1. Office of Naval Research (ONR) [N00014-16-1-2956, 43-6010-19]
  2. Advanced Research Projects Agency-Energy (ARPA-E) [1727-1519]

向作者/读者索取更多资源

The auxiliary power supply (APS) is critical for medium voltage converters, and insulation design is a key challenge, as partial discharge can lead to system failures. Therefore, a PD-free APS system is required for reliability. Wireless power transfer (WPT) technology is attractive due to its insulation capability, and experimental validation shows its reliability.
Auxiliary power supply (APS) that provides reliable power and voltage for gate drivers, controllers, and sensors is a critical component in a medium voltage (MV) converter. Compared to being fed from the power-cell dc-link, APS fed from an external earthed system has its own benefits. However, with the power-cell number scaled up, the insulation design of the externally fed APS becomes a significant challenge. Partial discharge (PD) can cause accumulative irreversible damages of insulation which further lead to auxiliary power circuit fault and eventually cascaded failures of the whole converter system. Therefore, a PD-free APS system ensuring the reliability of the MV converter is required. Among different technologies for building APS, wireless power transfer (WPT) becomes an attractive method because of its mechanical design flexibility and inborn insulation capability. In this article, in order to design a PD-free WPT converter, the insulation design criterion and electric field distribution under different coil geometries are analyzed, compared, and tested. Subsequently, a comprehensive insulation design including the influence of the ferrite shielding layer is shown. Finally, an optimized WPT prototype with 120-W output power, 92.78% full-power efficiency, 2.76-pF isolation capacitance, and 27-kV insulation capability is validated experimentally.

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