The simulation and test results of the TSC type RPC and HF system for enhancement of the KSTAR power system stabilization

Highlights: ► Remodeling of the existing RPC and HF system is unavoidable because the KSTAR operating capacity increases. ► We selected the TSC type RPC and HF system and completed simulation and setup. ► When the KSTAR experiment, the KSTAR power system was operated stably because the reactive power and harmonic decreased by the RPC and HF system injection. ► However, some resonance phenomenon of the low-order harmonic happened. ► Hereafter, we will upgrade according to the KSTAR experiment plan. - Abstract: The Korea Superconducting Tokamak Advanced Research (KSTAR) device requires a large pulse power to generate and confine plasma in order to function as a nuclear fusion device. Such a large pulse power causes voltage-drop and voltage-distortion in the electric power system, because it generates large reactive power and harmonic currents. These effects are detrimental to other experimental devices and deteriorate the power quality delivered by the power system. Therefore, it is important to stabilize the KSTAR power system by compensating for the reactive power and rejecting the harmonic currents using a Reactive Power Compensator (RPC) and Harmonic Filter (HF) system. The TSC type RPC and HF system has been fabricated to have a total capacity of 35 MVar and included two features. The first is a fast response speed of within 10 cycles to compensate for the reactive power. The second is a stable KSTAR power system in which no resonance is detected due to the installation of the TSC type RPC and HF system. This paper presents simulation results of the TSC type RPC and HF system and test results of the plasma experiment of KSTAR carried out in 2009.