Summary of Research Project Results under JSPS FY2001
"Research for the Future Program"

1.Research Institution The University of Tokyo
2.Research Area Physical and Engineering Sciences
3.Research Field Highly Efficient Use of Energy and Reduction of its Environmental Impact
4.Term of Project FY 1997 〜 FY 2001
5.Project Number 97P01004
6.Title of Project Fundamental Studies on Advanced Electric Power Systems by Application of Superconductivity

7.Project Leader
Name Institution,Department Title of Position
Tanzo Nitta The University of Tokyo, Graduate School of Engineering Professor

8.Core Members

Names Institution,Department Title of Position
Akihiko Yokoyama The University of Tokyo, Graduate School of Engineering Professor
Yasuyuki Shirai Kyoto University, Graduate School of Energy Science Associate Professor
Hiroyuki Ohsaki The University of Tokyo, Graduate School of Frontier Science Associate Professor

9.Summary of Research Results

The purpose of the research is to obtain advanced power systems by application of superconductivity. The research results are as follows:
Development of real time power system simulator with models of superconducting generators (SCG) and superconducting magnetic energy storage system (SMES)
Experiments on improved power system stability by use of SCG: SCG improves system stability with comparison to conventional generator. Machine parameters effective to system stability are defined.
Optimal location and parameter of SCG for improved power system stability for two typical power networks in Japan by eigenvalue control method.
Power system identification by use of SMES: By giving to small deviations of power from SMES, eigenvalues on operating condition can be obtained. Experiments were carried out by use of TNS and the models of SMES, and by use of SMES with small superconducting magnet and artificial transmission lines with rotating machines.
Development of power converter for SMES with non-forced commutation devices by application of energy transfer circuit of superconducting magnets.
Development of superconducting fault currents limiter (SCFCLs) with adjustable trigger current level: The SCFCLs have good characteristics such that the recovery time is less than 100 msec. Some experiments shows that SCFLCs can solve two problems on fault current limiting and power system stability
Surface discharge characteristics on insulation materials in Liq. N2 and Liq. He. The fundamental data obtained, by which the characteristics of any material can be obtained.
Application of bulk superconductor: Characteristics of motors or generators (Synchronous, induction, hysteresis ones with rotor of bulk superconductor) are obtained.

10.Key Words

(1)Superconductivity、(2)Advanced power system、(3)Economical operation
(4)Power system stability、(5)System identification、(6)Electrical Insulation
(7)Bulk superconductor、(8)Economical system configuration、(9)Fault current limiting