Abstract
Superconducting Magnetic Energy Storage (SMES) is an exceedingly promising energy storage device for its cycle efficiency and fast response. Though the ubiquitous utilization of SMES device is restricted because of the immense cost of cryogenic refrigeration system to sustain the superconducting state but with the continuous evolution of high Tc superconductors, SMES is turning into a major contender to the existing energy storage devices in the future. Among its several parts, the superconducting coil is considered to be the most crucial segment of this technology and the inductance generated in the coil determines the quantity of stored energy. In this paper, the possible geometrical configurations of SMES coil have been demonstrated. High Tc superconducting tapes are usually employed to form these configurations worldwide. BSCCO (Bismuth strontium calcium copper oxide)-2223 tape superconductor has been considered for studying the conceptual designs of superconducting coil of SMES. Before estimating the results, the value of critical current at different magnetic field densities and temperatures have been addressed through the study of superconducting tape characterization. Numerical results and the relationship among the several parameters for both the solenoid and toroid configurations in different specifications have been presented. Based on the results, the size ratio in solenoid and the mean toroid diameter in toroid arrangement is found to play the vigorous roles in the generation of inductance and hence the energy storage. The results also match the propensity of other studies. Suggestions for maximum energy gain from a specific solenoid configuration have been provided. Future research scopes with alternative superconducting tapes and limitations of this study have been briefly conferred.
Highlights
Superconducting Magnetic Energy Storage (SMES) is an exceedingly promising energy storage device for its cycle efficiency and fast response
The theoretical considerations of superconducting magnet have been demonstrated in Fig. (6, 7, 8, 12 and 17) and the results are in Fig. 9-11, 13-16, 18-21, provide the understanding of the relationships among the parameters that determines the amount of the energy stored in the system
Though we have neglected the inter-distance between the pancakes in solenoid arrangement but it did not left any major impact on our results
Summary
Superconducting Magnetic Energy Storage (SMES) is an exceedingly promising energy storage device for its cycle efficiency and fast response. We will present the study on conceptual designs and theoretical considerations of superconducting magnet coils (solenoid and toroid) of SMES system for energy storage purpose. When the flow of DC current in a wire made of the material that possesses superconducting behavior, a magnetic field is generated due to the flow under proper condition This means that the energy will be stored in the form of a magnetic field in a persistent mode and will remain the same until utilized. A very steady DC current will exist in a closed circuit due to the zero resistance environment of a superconductor This principle works on a superconducting coil storing electrical energy in the form of magnetic field and the stored energy will be inductive. The inductance of a solenoid coil can be written in the form [5],
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