Development of toroid-type HTS DC reactor series for HVDC system

Abstract

This paper describes design specifications and performance of a toroid-type high-temperature superconducting (HTS) DC reactor. The first phase operation targets of the HTS DC reactor were 400mH and 400A. The authors have developed a real HTS DC reactor system during the last three years. The HTS DC reactor was designed using 2G GdBCO HTS wires. The HTS coils of the toroid-type DC reactor magnet were made in the form of a D-shape. The electromagnetic performance of the toroid-type HTS DC reactor magnet was analyzed using the finite element method program. A conduction cooling method was adopted for reactor magnet cooling. The total system has been successfully developed and tested in connection with LCC type HVDC system. Now, the authors are studying a 400mH, kA class toroid-type HTS DC reactor for the next phase research. The 1500A class DC reactor system was designed using layered 13mm GdBCO 2G HTS wire. The expected operating temperature is under 30K. These fundamental data obtained through both works will usefully be applied to design a real toroid-type HTS DC reactor for grid application.