Accurate Calculation of Asymmetrical Fault Currents in Comples Power Systems

This paper describes an efficient method for accurate calculation of system asymmetrical short circuit currents for both balanced and unbalanced faults. The method uses a Fourier transform technique to calculate the unidirectional component of the short circuit current and a transient stability program to compute the alternating component. The proposed method is validated by comparing its results with those of a detailed time domain simulation.