Simulation and Analysis for New Bridge-Type High Temperature Superconducting Fault Current Limiter

Abstract

In this paper, a bridge-type high temperature superconducting (HTS) fault current limiter (FCL) is presented. The working principle of this HTS FCL is analyzed in detail. Two anti-parallel coils which are made of HTS tapes are main parts of the FCL. The superconducting FCL (SFCL) has no influence on power system in normal working state because the equivalent resistance and inductance of the SFCL are very small. However when a fault occurs, the SFCL may provide large resistance and inductance to limit the fault current due to quench of one coil. Considering heat is generated in one of coils when superconducting/normal (S/N) transition occurs, the coil can be isolated before too much heat is generated. The design of the SFCL is carried out, and simulation computation and analysis were completed so as to verify the SFCL design. The results reveal that the bridge-type HTS FCL has rapid response to limit fault current.

Controllable resistive type fault current limiter (CR-FCL) with frequency and pulse duty-cycle

“…Three-phase experimental and simulation results demonstrate the validation of analytical analyses and the capability of the CR-FCL to generate the desired controllable resistance value. To prove (11), from t off to t 1 , (1ÀD)T s seconds after t off , self turn off switch is OFF and so (A1) can be written as follows:…”

“…(11) Shows that the value of I ss.av depends on D and so R ac . It means that, by controlling D, it is possible to change the value of I ss.av .…”

“…It means that, by controlling D, it is possible to change the value of I ss.av . By simplifications (assumed that f s has large value), (11) can be simplified to (12).…”

“…These FCLs can be classified by impedance type: inductive and resistive type FCLs [9][10][11][12][13][14][15].…”