Design and Operating Characteristic Analysis of D-Shape HTS Coil for 1500-A 400-mH Class Toroid-Type HTS DC Reactor

A dc reactor is operated under a dc current to reduce the current's ripple or harmonics in the power system. General dc reactors in high-voltage dc systems use a metal conductor. This has some disadvantages such as large reactor size, leakage flux, wide install space, heavy weight, and electrical losses due to the large operating current. This paper describes the design of the toroid-type high-temperature superconductor (HTS) dc reactor magnet. Target operating current and inductance of the HTS dc reactor are 1500 A and 400 mH, respectively. The HTS dc reactors were designed through electromagnetic analysis and a 3-D CAD program. The two-layered 12-mm-width 2G GdBCO wire was considered. In addition, we analyze the operating performance of the double pancake coil module for the 1500-A 400-mH HTS dc reactor magnet under the liquid nitrogen condition.