Y
Yuhei Okazaki
Researcher at Tokyo Institute of Technology
Publications - 20
Citations - 348
Yuhei Okazaki is an academic researcher from Tokyo Institute of Technology. The author has contributed to research in topics: Inverter & Induction motor. The author has an hindex of 9, co-authored 20 publications receiving 266 citations.
Papers
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Journal ArticleDOI
Experimental Comparisons Between Modular Multilevel DSCC Inverters and TSBC Converters for Medium-Voltage Motor Drives
Yuhei Okazaki,Wataru Kawamura,Makoto Hagiwara,Hirofumi Akagi,Takashi Ishida,Masahiko Tsukakoshi,Nakamura Ritaka +6 more
TL;DR: In this paper, a comparison between a modular multilevel double-star chopper-cells (DSCC) inverter and a modular multi-level triple-star bridgecells (TSBC) converter is made, which reveals that the torque and frequency of a driven motor produce a significant effect on capacitorvoltage fluctuation and arm or cluster current in the individual DSCC inverter.
Journal ArticleDOI
A Speed-Sensorless Start-Up Method of an Induction Motor Driven by a Modular Multilevel Cascade Inverter (MMCI-DSCC)
TL;DR: Experimental results obtained from the 400-V 15-kW downscaled system with no speed sensor verify that the motor-speed control proposed for the DSCC-based drive system can enhance the start-up torque by a factor of three under the same ac-voltage fluctuation.
Journal ArticleDOI
Review of Hybrid Multilevel Converter Topologies Utilizing Thyristors for HVDC Applications
Panagiotis Bakas,Yuhei Okazaki,Anshuman Shukla,Siba Kumar Patro,Kalle Ilves,Frans Dijkhuizen,Alireza Nami +6 more
TL;DR: Comparisons show that hybrid converters have functionality similar to either the modular multilevel converter or the line-commutated converter, depending on the ratio between thyristor and active switch IGBT counts employed.
Journal ArticleDOI
Capacitor-Voltage Balancing for a Modular Multilevel DSCC Inverter Driving a Medium-Voltage Synchronous Motor
TL;DR: This paper provides a comprehensive discussion on voltage balancing of all the floating capacitors in a modular multilevel cascade inverter based on double-star chopper cells (DSCC) or a modularMultilevel DSCC inverter.
Proceedings ArticleDOI
Which is more suitable for MMCC-based medium-voltage motor drives, a DSCC inverter or a TSBC converter?
Yuhei Okazaki,Wataru Kawamura,Makoto Hagiwara,Hirofumi Akagi,Takashi Ishida,Masahiko Tsukakoshi,Nakamura Ritaka +6 more
TL;DR: In this article, the authors compared the performance of a double-star chopper-cells (DSCC) inverter and a triple-star bridgecells (TSBC) converter with a common three-phase four-pole induction motor.