Definition of Critical Currents in Superconducting Magnetic Energy Storage Systems

Superconducting magnetic energy storage (SMES) systems are expected to be very prospective and flexible energy storage elements of future electric grid interconnectors based on renewable power sources. Superconducting storage elements may be characterized by such important parameters as a very fast response on variation of the energy generation conditions and consumption as well as a very high efficiency reaching 95%. In practice the quality of the power generated in renewable power systems depends strongly on fast variations in such natural factors as solar radiation or the wind velocity and abrupt change in the load. The SMES device is one of the best choices to overcome the corresponding fluctuation of a generated power. The basis of future SMES systems is assumed to be a coil set wound with high temperature superconducting tape. One of the problems to be solved in such a case is definition of the coil critical current. It is well known that the critical current density de-pends on the induced magnetic field intensity. The main difficulty in theoretical prediction of these characteristics is essential non-uniform current density distribution in the superconducting tapes. In this paper we propose a new method of the SMES coils description using a solution of an integral equation based on the critical state theory of 2-nd type superconductors and magnetic field laws.

• BAGAN G. Steve Sèdjro

Mots clés de JLST

Mots clés de l'auteur
Magnetic field; superconductivity; critical current; renewable energy sources; energy storage; integral equations;

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