The operation results and study of KSTAR pulsed electric power network for superconducting magnet power supply

•Developing the simulation tool of superconducting magnet power supply system to analyze the KSTAR power system.•Analyzing the electrical operation data of KSTAR fusion experiment and issues.•A study on the impact of plasma control system on the faults of KSTAR pulsed electric power network.•Solutions for the issues and future upgrade of KSTAR power system.