Temperature Characteristic of a Conduction-Cooled HTS SMES Magnet

A 35 kJ/7 kW conduction-cooled HTS SMES is developed. The magnet of the SMES is a solenoid type coil, made of Bi2223/Ag tapes, and cooled to about 20 K by a cryocooler through conduction-cooled method. To evaluate the performance of the 35 kJ/7 kW SMES, system characteristics such as current carrying ability, power conditioning capability and dynamic operation for stabilizing power systems are investigated by experiments. In this paper, the temperature characteristic of the conduction-cooled HTS magnet for 35 kJ/7 kW SMES is analyzed. Experimental results verify that the thermal stability of the HTS magnet can meet the requirement of dynamic power compensation. Integrating with the analysis of the energy loss in dynamic operation of the magnet, the methods to reduce the energy loss and improve the thermal stability of the conduction-cooled HTS SMES magnet are discussed.