Characteristic Test of HTS Pancake Coil Modules for Small-Sized SMES

Abstract

In this paper, 16 HTS pancake coil modules made with 32 double pancake coils were designed, analyzed, built, assembled, and tested to show feasibility of small sized HTS SMES ( -SMES). Rated current is 200 A and operating temperature is 20 30 K. Evolution strategy was used for coil optimization and FEM was used for magnetic field calculation. After building the modular toroid coils, a vacuum chamber was built to contain the coil. Three GM cryocoolers were used to reach the operating temperature. Bridge type converter was used to supply the current to the SMES coil modules. Operation showed a close agreement with the calculated result.

Superconducting Magnetic Energy Storage System (SMES) for Improved Dynamic System Performance

“…The superconductor used here is mainly a 12.5 H inductor with a 100 MJ storage capacity. A SMES coil is wound in a cylindrical shape with a double pancake structure [6]. The SMES coil is designed taking into consideration the self and mutual inductances, turn-turn and turn-ground capacitances that arise due to its construction [7].…”

“…A single solenoid model causes a lot of stray field effects and hence a large number of small size solenoids can be constructed to reduce the stray field but this type of configuration ends up using more conductor material. A modular shaped construction [6,8] of the toroidal type SMES coil reduces stray field effects to a large extent. The SMES coil used here has a height / width ratio of 3.66 m/1.53 m made of 48 double pancakes.…”