Superconducting Magnet Power Supply System for the KSTAR 2^ndPlasma Experiment and Operation

Abstract

-The Korea Superconducting Tokamak Advanced Research (KSTAR) device is an advanced superconducting tokamak to establish scientific and technological bases for attractive fusion reactor. This device requires 3.5 Tesla of toroidal field (TF) for plasma confinement, and requires a strong poloidal flux swing to generate an inductive voltage to produce and sustain the tokamak plasma. KSTAR was originally designed to have 16 serially connected TF magnets for which the nominal current rating is 35.2 kA. KSTAR also has 7 pairs of poloidal field (PF) coils that are driven to 1 MA/sec for generation of the tokamak plasma according to the operation scenarios. The KSTAR Magnet Power Supply (MPS) was dedicated to the superconducting (SC) coil commissioning and 2 nd plasma experiment as a part of the system commissioning. This paper will describe key features of KSTAR MPS for the 2 nd plasma experiment, and will also report the engineering and commissioning results of the magnet power supplies.

Research on a Novel Hybrid Power Supply Scheme with Energy Storage Technology for Tokamak

“…where C i,E means the required energy capacity for each ESPS. Finally, obtain the sum of the max value of C i,E for every ESPS, which is the required energy capacity C E for all ESPSs, as shown in (10).…”

“…(2) Capacity for transformers. Considering that main transformers provide the stable power excluding that of ESPSs, the capacity of main transformers in numerical terms can be expressed as Equation (10), and the capacity of each rectifier transformer (C i,RT ) is easily obtained according to Equation ( 8) 3), ( 5), and ( 6). Therefore, the unified cost for power supply system will be finally determined by formula (1).…”

“…Currently, to avoid the detriment brought by the hugeamplitude power impact, fusion devices in various countries, such as ITER [5], JT-60 Super Advanced (JT-60SA) in Japan [6,7], Joint European Torus (JET) in Europe [8,9], and Korea Superconducting Tokamak Advanced Research (KSTAR) in Korea [10][11][12], are equipped with large main transformers and generators, even connected to a high-voltage grid, as shown in Table 1. In particular, only a 16MVA main transformer is installed in the German ASDEX-U device [13,14], and the generator provides almost the capacity required by the load.…”