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Design and Simulation of SMES System Using YBCO Tapes for Direct Drive Wave Energy Converters

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9 Author(s)
Huiming Zhang ; Electron. & Electr. Eng. Dept., Univ. of Bath, Bath, UK ; Zanxiang Nie ; Xi Xiao ; Aggarwal, R.
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The ocean represents a huge energy reservoir since waves can be exploited to generate clean and renewable electricity; however, a hybrid energy storage system is needed to smooth the fluctuation. In this paper a hybrid energy storage system using a superconducting magnetic energy system (SMES) and Li-ion battery is proposed. The SMES is designed using Yttrium Barium Copper Oxide (YBCO) tapes, which store 60 kJ electrical energy. The magnet component of the SMES is designed using global optimization algorithm. Mechanical stress, coupled with electromagnetic field, is calculated using COMSOL and Matlab. A cooling system is presented and a suitable refrigerator is chosen to maintain a cold working temperature taking into account four heat sources. Then a microgrid system of direct drive linear wave energy converters is designed. The interface circuit connecting the generator and storage system is given. The result reveals that the fluctuated power from direct drive linear wave energy converters is smoothed by the hybrid energy storage system. The maximum power of the wave energy converter is 10 kW.

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Applied Superconductivity, IEEE Transactions on  (Volume:23 ,  Issue: 3 )