Stability analysis for the voltage of EAST loads based on the short circuit capacity

Abstract

Based on the accurate load model of poloidal field power supply (PFPS) in EAST, the analytical relationship between the short-circuit capacity of distribution outlet bus and the voltage stability of tokamak load is obtained. In the way of the Thevenin equivalent analysis, the stability margin index is deduced by the difference between the critical minimum short-circuit capacity and the actual short-circuit capacity. At the same time, the influence of tokamak load on voltage stability is analysed, which provides a theoretical basis for ensuring the efficient operation of the tokamak device and the stability of the distribution network. The correctness of the theoretical analysis is verified by the simulation of corresponding control measures finally. According to the analysis, a comprehensive and systematic distribution network planning system is afforded for the China Fusion Engineering Test Reactor (CFETR).