Study on the Simplified Distributed Parameter Model for HTS Cables

Nowadays, the power demand has been dramatically rising in highly populated load areas. The high-temperature superconductor (HTS) cables are one possible solution for the electricity transmission due to their high transmission capacity and tremendously lower electrical loss compared with traditional power cables. A comprehensive and accurate model is very important to predict the working condition prediction for the purpose of power flow control, relay protection and overvoltage protection, especially for HTS cable which is highly expensive and lacking of operation experience. In this paper, a simplified analytical model of HTS cable is presented to further facilitate operating condition simulations. The inductances are derived and the result is verified with FEM software COMSOL. The self-, mutual inductances, capacitances between each layer are calculated to build the parameter matrixes. By appropriate transformation, electrical parameter matrixes can be converted into simplified PI sections. A simple simulation model for power system containing HTS cable can be built up by using EMTP-ATP program. The instructive guide for protection systems for HTS cables may be provided according to the simulation results. The simplified distributed parameters model described in the paper is also helpful for structure optimization to obtain uniform current distribution in superconductor layers.