An analytical power frequency reactance calculation method of the triaxial high temperature superconducting cables

Abstract

Using the triaxial high temperature superconducting cables (HTSC) for high density load supply in modern cities is a new development direction. Since the triaxial HTSCs have a different structure from the common cables, their reactance cannot be calculated by conventional methods. In order to establish a basis for further research on operation control, it is important to study the analytical power frequency reactance calculation method of the triaxial HTSC. In this paper, the mathematical model of the triaxial HTSC is established based on the branch parameter method. Based on the model, the analytical calculation method of the three-phase reactance and sequence reactance parameters is established considering the magnetic field coupling and boundary conditions. The calculated values are compared with the measured sequence reactance values of the triaxial HTSC in a pilot project, and the comparison results verify the accuracy and validity of the proposed method. Furthermore, considering the asymmetrical three-phase parameters of the triaxial HTSCs, the impact on the power system operation is tested through the simulation model based on the pilot project network. Simulation results show that the impact is small and does not endanger the system stability.