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189 results on '"Miura, Yushi"'

12. Application of the SMES for the large scale accelerator magnet power supply

Author

Sato, Hikaru, Okamura, Katsuya, Ise, Toshifumi, Miura, Yushi, Nomura, Shinichi, Shimada, Ryuichi, Shintomi, Takakazu, and Yamamoto, Shigeharu

Subjects
Synchrotron -- Analysis, Particle accelerators -- Evaluation, Superconducting magnets -- Design and construction, Business, Electronics, Electronics and electrical industries
Abstract

The research and development status of the superconducting magnetic energy storage (SMES) and the application of the SMES to the accelerator magnet power supply are discussed. The progress of power semiconductor has shown the availability of SMES for stabilizing the power system and maintaining power quality along with controlling the frequency fluctuation.

Published
2008

13. DC loop type superconducting distribution system including various distributed generations

Author

Miura, Yushi, Sato, Ryo, Saisho, Masaki, and Ise, Toshifumi

Subjects
High temperature superconductors -- Design and construction, Superconductive devices -- Installation, Electric power distribution -- Methods, Technology installation instructions, Business, Electronics, Electronics and electrical industries
Abstract

The article discusses a dc loop type distribution system using high temperature superconducting (HTS) cable. Findings reveal that the system is effective in reducing transmission losses in the cable and in easy installation of superconducting devices.

Published
2007

14. Design and stress analysis of support structure of toroidal field coil for the JT-60SC

Author

Tsuchiya, Katsuhiko, Kizu, Kaname, Miura, Yushi M, Ando, Toshinari, Sakasai, Akira, Matsukawa, Makoto, Tamai, Hiroshi, and Ishida, Shinichi

Subjects
High temperature superconductors -- Mechanical properties, Stress analysis (Engineering), Business, Electronics, Electronics and electrical industries
Abstract

The support structure of the TF coils is designed to withstand the larger electromagnetic force on the basis of the stress analyses. The maximum displacement and the Tresca stress of the TF coil are evaluated in the cas4e of the plasma disruption at the end of plasma current flat-top.

Published
2004

15. Measurement of high frequency impedance of ITER CS model coil and simulation analysis of internal resonance phenomenon

Author

Matsukawa, Makoto, Miura, Yushi M., Shimada, Katsuhiro, Terakado, Tsunehisa, Okano, Jun, Isono Takaaki, and Nunoya, Yoshihiko

Subjects
Superconducting magnets -- Magnetic properties, Electric coils -- Magnetic properties, High temperature superconductors -- Magnetic properties, Business, Electronics, Electronics and electrical industries
Abstract

The internal resonance phenomenon of a large-scale superconducting coil is described. The frequency dependence of the electric impedance defined at the coil terminal and the voltage distribution of the layer winding are measured at the ITER CS model coil under the superconducting state in advance of the pulse operation test.

Published
2004

37. Parallel operation of a synchronous generator and a virtual synchronous generator under unbalanced loading condition in microgrids

Author

Jin Yoshizawa, Miura Yushi, Kenichi Watanabe, Jia Liu, and Toshifumi Ise

Subjects
Engineering, Stator, business.industry, 020209 energy, 020208 electrical & electronic engineering, 02 engineering and technology, Permanent magnet synchronous generator, law.invention, Power (physics), Overcurrent, law, Control theory, 0202 electrical engineering, electronic engineering, information engineering, Transient (oscillation), business, Electrical impedance, Voltage, Reference frame
Abstract

Parallel operation of a synchronous generator (SG) and an inverter-interfaced distributed generator (DG) is required in some islanded microgrids. However, dynamic performance of a small SG is usually poor, i.e. the rotor speed usually deviates largely during a loading transition, due to small inertia and slow governor response. Moreover, unbalanced SG current should be prevented to protect the SG, which makes this issue more challenging. In this paper, a control method for the inverter-interfaced DG based on virtual synchronous generator (VSG) concept is proposed, to improve the overall performance of parallel operation of SG and DG. Double decoupled synchronous reference frame (DDSRF) decomposition, SG negative-sequence current compensation, modified calculation methods for power and voltage, and transient virtual stator impedance are integrated into the proposed VSG control scheme, and tuning methods of main control parameters are discussed. It is demonstrated by simulation results that the proposed DG control method alleviates the SG rotor speed deviation and DG overcurrent during a loading transition, and eliminates the negative-sequence components of the SG output current.

Published
2016

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