Jumpei Baba / Associate Professor / Division of Transdisciplinary Sciences
Department of Advanced Energy / / Application of power electronics and superconductivity for power systems

Career Summary
1996: B.Eng., Faculty of Engineering (University of Tokyo)
2001: Ph.D. (University of Tokyo)
2001-2003: Assistant (Tokyo University of Science)
2003-2005: Assistant (University of Tokyo)
2005: Lecturer (University of Tokyo)
2006: Associate Professor (University of Tokyo)
Educational Activities
Graduate school: Energy Electronics I, II
Undergraduate school: Power Electronics, Applied Electrical Engineering
Research Activities
Natural commutated converter for superconducting energy storage system (1998-2001):
A superconducting energy storage system (SMES) requires a current-source-type power converter because it stores energy in a large inductor. A natural commutated converter achieves high power conversion efficiency and is a current-source-type power converter. However, it has problems with output power controllability enhancement and in clearing controllable regions where currents stably commutate between switches. In this study, the controllability and stable operation area of an inverter-converter bridge energy transfer circuit was analyzed theoretically and experiments were conducted. There was good agreement between the theory and the experimental results.
Micro-grid consisting several kinds of generation systems (2001-[present]):
A design and control method for a micro-grid consisting of several kinds of generation systems have been proposed. Experiments have been conducted using real building loads. It was shown the proposed method is useful for such systems.
Fault current limiter using YBCO thin films (2003-[present]):
A designing method for a fault current limiter using large YBCO thin films is been studied.
1) J. Baba, T. Nitta, Y. Shirai, Y. Hayashi, Y. Kobayashi, "Power Converter for SMES by use of ICB Energy Transfer Circuit", IEEE Trans. on ASC, Vol. 11, No. 1, pp. 1856-1859, 2001.3
2) J. Baba, T. Nitta, Y. Shirai, Y. Hayashi, "Power controllable region of a power conversion system for SMES by use of a single natural commutation converter and an ICB energy transfer circuit", IEEE Trans. on ASC, Vol. 14, No. 2, pp. 758-761, 2004
3) J. Baba, S. Suzuki, S. Numata, S. Kusagawa, T. Yonezu, A. Denda, T. Nitta, E. Masada, "Power supplying system for micro grid by combination of different distributed power sources", EPE2005, 344, Dresden, Germany, 2005.9.
4) J. Baba, T. Higata, M. Chiba, T. Nitta, "Fundamental characteristics on Y123 thin film for switching surge current to design SCFCL", IEEE Trans. on ASC, Vol. 15, No. 2, pp. 1970-1973, 2005
Other Activities
Institute of Electrical and Electronics Engineers (IEEE)
Institute of Electrical Engineers of Japan (IEEJ)
Cryogenic Association of Japan (CSJ)
Future Plan
We are working on research to establish a next generation power system, focusing particularly on new power control devices and system control methods.
Messages to Students
Our laboratory conducts many experiments on power systems. In the experiments, all members participate. If you are interested in many aspects, our laboratory would be heaven for you.