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1. Auxiliary Power Supply for Medium-Voltage Power Converters: Topology and Control

   https://doi.org/10.1109/TIA.2019.2915511  

   Won, Jehyuk; Jalali, Gholamreza; Liang, Xinyu; Zhang, Chi; Srdic, Srdjan; Lukic, Srdjan M. (July 2019, IEEE Transactions on Industry Applications)
2. Review of Standards on Insulation Coordination for Medium Voltage Power Converters

   https://doi.org/10.1109/OJPEL.2021.3065813  

   Nasiri, Adel; Altin, Necmi; Ozdemir, Saban; Cuzner, Robert M. (March 2021, IEEE Open Journal of Power Electronics)

   null (Ed.)

   The increasing viability of wide band gap power semiconductors, widespread use of distributed power generations, and rise in power levels of these applications have increased interest and need for medium voltage converters. Understanding the definitions of insulation coordination and their relationship to applications and methodologies used in the test environment allows system engineers to select the correct insulation materials for the design and to calculate the required distances between the conductive surfaces, accessible parts and ground accurately. Although, design guidelines are well established for low voltage systems, there are some deficiencies in understanding and meeting the insulation coordination requirements in medium voltage, medium frequency applications. In this study, an overview on standards for insulation coordination and safety requirements is presented to guide researchers in the development of medium voltage power electronic converters and systems. In addition, an insulation coordination study is performed as a case study for a medium frequency isolated DC/DC converter that provides conversion from a 13.8kV AC system to a 4.16kV AC system. 

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3. Design and Demonstration of a Medium-Voltage Silicon Carbide ANPC Power Stage

   https://doi.org/10.1109/ECCE50734.2022.9948083  

   Ma, Zhuxuan; Diao, Fei; Wang, Zhongjing; Wu, Yuheng; Mahmud, Mohammad Hazzaz; Zhao, Yue (July 2022, 2022 IEEE Energy Conversion Congress and Exposition (ECCE))
4. An Optimal Design of a Hybrid Liquid/Air Cooling System for High Power, Medium Frequency, and Medium Voltage Solid-State Transformer

   https://doi.org/10.1109/PEDG51384.2021.9494251  

   Beheshtaein, Siavash; Alshafei, Ahmad; Jean-Pierre, Garry; Altin, Necmi; Khayamy, Mahydy; Cuzner, Robert; Nasiri, Adel (June 2021, International Symposium for Power Electronics in Distributed Generation Systems)

   In this paper, a 10 kV SiC MOSFET-based solid-state transformer (SST) operating at 13 kV to 7.2 kV, 667 kW, and 20 kHz is modeled and optimized to reach maximum power density and efficiency. In order to reach optimum configuration, different core material/type/size, primary/secondary turns, insulation type/thickness, and cooling systems are considered; then based on a systematic approach the best solution is obtained. To reach this goal, the magnetic part of SST forced air-cooling, and the water-cooling system is modeled in ANSYS MAXWELL/Simplorer, ANSYS-ICEPAK, and ANSYS-FLUENT, respectively. The simulation results show a high efficient SST with an effectiveness of the cooling system. 

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5. A Wireless Power Transfer based Gate Driver Design for Medium Voltage SiC MOSFETs

   https://doi.org/10.1109/IFEEC53238.2021.9661739  

   Wei, Yuqi; Du, Liyang; Du, Xia; Machireddy, Venkata Samhitha; Mantooth, Alan (November 2021, IEEE International Future Energy Electronics Conference (IFEEC))

   Wide band gap (WBG) devices have been widely adopted in numerous industrial applications. In medium voltage applications, multi-level converters are necessary to reduce the voltage stress on power devices, which increases the system control complexity and reduces power density and reliability. High voltage silicon carbide (SiC) MOSFET enables the medium voltage applications with less voltage level, simple control strategy and high power density. Nevertheless, great challenges have been posed on the gate driver design for high voltage SiC MOSFET. Wireless power transfer (WPT) can achieve power conversion with large airgap, which can satisfy the system isolation requirement. Thus, in this article, a WPT based gate driver is designed for the medium voltage SiC MOSFET. The coil is optimized by considering voltage isolation, coupling capacitance, size, and efficiency. Experimental prototype was built and tested to validate the effectiveness of the proposed WPT based gate driver. 

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