A 600 V/150 kJ/100 kW conduction-cooled high temperature superconducting (HTS) magnetic energy storage (SMES) system is developed. In this paper, the configuration of the HTS SMES is introduced. The magnet is a solenoid type, which uses two kinds of HTS tapes, and cooled to about 20 K. A series of laboratory experiments and field tests are carried out to evaluate the performance of the SMES system, including currentcarrying ability of the magnet, the active and reactive power exchange capability between the SMES and the ac power system, power oscillation damping, as well as the improving electrical energy quality, etc. The results show that the SMES system meets design requirements and can maintain a long-term stable operation in power system. 

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