PROJECT TITLE :

Closed-loop Distribution Network by a Mid-voltage Flexible HTS DC System - 2016

ABSTRACT:

A theme of closed-loop distribution network by a midvoltage flexible high-temperature superconducting (HTS) dc system is proposed and analyzed. This midvoltage (ten-kV) scheme is compared, in terms of capital prices, with that of the closed-loop distribution network by a high-voltage (110-kV) versatile conventional dc system. Based mostly on the HTS cables that are created of the first-generation Bi2223 tapes with a length of two.5 km, the full investment cost of the ten-kV flexible superconducting dc system with an influence capacity of 42 MVA is estimated regarding 1percent less than that of the 110-kV versatile conventional dc system with the identical power capacity, as a result of the substantial cost reduction of the voltage-supply converter stations with the reduced voltage level. According to the “N - 1” principle of distribution networks, with the interconnecting versatile HTS dc system of 42 MVA, the full power to supply hundreds of the connected substations can be increased by the identical power capacity of the interconnecting system. The simulation results of a 3-phase short-circuit fault reveal that the voltage recovery time of the crucial hundreds in the closed-loop distribution network can be reduced to less than zero.1 s, that is abundant faster than that in open-loop distribution networks.