抄録
Maximum short circuit current of modern power system is becoming so large that circuit breakers are not expected to be able to shut down the current in near future. Fault Current Limiter (FCL) is supposed to be an effective solution of this problem and recent progress of superconductivity technology and power electronics makes it possible to develop current limiting type FCL such as diode-bridge type FCL. Current limiting type FCL limits the current through the FCL and its equivalent impedance is not constant and depends on fault location, operating point of power system and the limit of the current through FCL. In this paper, a method to incorporate such FCL into short circuit current analysis is proposed. Also, an efficient method to find location of FCLs suitable to suppress short circuit currents of more than one fault locations is developed. The efficiency and effectiveness of these methods are shown by numerical examples.
