Annular bearer network and service bearing implementation method therefor

Abstract

Provided are a method and apparatus for calculating fault resistance and a current-limiting current of a superconducting fault current limiter. The method includes: calculating a first short-circuit fault current I(t) of a power grid short-circuit fault transient circuit; calling an external characteristic model U(I,t), and calculating resistance R(t) of a superconducting fault current limiter under the first short-circuit fault current I(t); adding the resistance R(t) of the superconducting fault current limiter into the power grid short-circuit fault transient circuit, and calculating a second short-circuit fault current I(t), where m=n+1; and determining whether an error between the second short-circuit fault current I(t) and the first short-circuit fault current I(t) is smaller than a preset threshold value, if yes, determining the fault resistance and the current-limiting current of the superconducting fault current limiter to be R(t) and I(t) respectively; otherwise, I(t)=I(t), returning for iteration.