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Bunkyō-ku, Japan

Noda S.,Kyoto University | Oda S.,Kyoto University | Mori M.,niversity of Tokyo | Hattori K.,niversity of Tokyo | And 2 more authors.
Physics Procedia | Year: 2012

We have proposed new design of a transformer type SFCL with primary and secondary superconducting coils which has rewound structure. For not so large fault current, the proposed SFCL limits the current by the inductive component by the normal transition of the flux shielding coil (secondary), and for larger fault current, it can give the resistive component additively by the normal transition of the primary coil. The recovery characteristics under load condition and repetitive limiting operation were experimentally investigated in a laboratory scale power system. The SFCL limited twice repetitive faults current and recovered quickly under load condition. © 2011 Published by Elsevier B.V. Selection and/or peer-review under responsibility of the Guest Editors. Source

Ota Y.,niversity of Tokyo | Taniguchi H.,niversity of Tokyo | Nakajima T.,niversity of Tokyo | Liyanage K.M.,niversity of Tokyo | And 4 more authors.
IEEJ Transactions on Power and Energy | Year: 2011

Penetrating large amount of renewable energy sources into power system, battery energy storage performs an important role for smoothing their natural intermittency, ensuring grid-wide frequency stability, and suppressing voltage rise caused by reverse power flow. The ubiquitous power grid is one of the concepts as a smart grid in Japanese context, where the total battery capacity can be optimized by coordinating renewable energy sources, controllable distributed generators, and controllable loads on demand side, for example, heat pump based water heater with heat storage, and plug-in hybrid vehicle or electric vehicle with onboard battery, and so on. These controllable devices behave as an autonomous distributed smart storage by charging or discharging against the power system frequency measurement as paying attention to user convenience. In this paper, the effects of the autonomous distributed smart storage on load frequency control of the bulk power system are investigated. And the authors propose a simple coordinated control scheme to the spinning reserve of the thermal power generator. © 2011 The Institute of Electrical Engineers of Japan. Source

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