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Proposed Improvements to the Neutral Beam Injector Power Supply System

Jiang, Zhen
http://rave.ohiolink.edu/etdc/view?acc_num=miami150187797853065

Abstract Details

2017, Master of Science, Miami University, Computational Science and Engineering.
The tokamak fusion reactor is one of the most promising and well-developed designs for fusion energy production. Scientists around the world use tokamaks to research methods of generating electrical energy from the fusion reaction. Furthermore, efforts are now underway to design a new large sized tokamak, Chinese Fusion Engineering Test Reactor (CFETR), with the aim of demonstrating fusion energy as a viable source of power. As this project is just beginning, it is necessary to evaluate new and emerging technologies that can be used in this endeavor. Power electronics play a crucial role in fusion energy research and are the focus of the thesis. The High Power, Power Supplies (HPPS) transforms electrical energy from the grid into AC and DC signals with extremely high voltage and current magnitudes. For example, the Neutral Beam Injectors (NBI) require a power source that is capable of generating 110 kVDC at nearly 10 MW. This thesis evaluates two new types of technology for use in the NBI power supply; the utilization of new semiconductor switching devices and the application of new circuit topologies. The switching devices used in the existing HPPS all utilize silicon based semiconductors. Within the last ten years, new devices created from Wide Bandgap (WBG) semiconductors have become commercially available. This thesis demonstrates that gains in efficiency are possible by utilizing WBG based power devices in the NBI power supply. It also explores the application of a Modular Multilevel Converters (MMC) as a replacement to the existing topology used in the NBI power supply. It shows that the MMC can be used as both a rectifier for the NBI and an active filter for the electrical grid. The case study for this work is the NBI power supply of Experimental Advanced Superconducting Tokamak in Hefei, China. However, the findings are applicable to CFETR as well as other future designs of tokamak reactors.
Mark Scott (Advisor)
Dmitriy Garmatyuk (Committee Member)
Donald Ucci (Committee Member)
89 p.
Electrical Engineering
Fusion Reactor, Tokamak,Chinese Fusion Engineering Test Reactor, Neutral Beam Injector,Wide Bandgap, Modular Multilevel Converter

Recommended Citations

Citations

  • Jiang, Z. (2017). Proposed Improvements to the Neutral Beam Injector Power Supply System [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami150187797853065

    APA Style (7th edition)

  • Jiang, Zhen. Proposed Improvements to the Neutral Beam Injector Power Supply System . 2017. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami150187797853065.

    MLA Style (8th edition)

  • Jiang, Zhen. "Proposed Improvements to the Neutral Beam Injector Power Supply System ." Master's thesis, Miami University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami150187797853065

    Chicago Manual of Style (17th edition)

miami150187797853065
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© 2017, all rights reserved.
This open access ETD is published by Miami University and OhioLINK.