Design of a full-bridge type fault current limiter

Abstract

Compared to AC system, DC power system is more likely to be damaged by short current, because in DC system the fault current increases faster and doesn’t have zero crossing point. The DC current limiter (FCL) can limit the rise of the current, thus it is efficient to use FCL to improve the reliability of the power system. Based on the previous research, we proposed an improved topology, established its mathematical model and analyzed its working processes. Besides, parameter design methods of solid-state DC current limiter are proposed by combining modeling and image analysis. And the control strategy of DC transformer short circuit fault crossing and recovery is put forward. Simulation and experiment results proved the effectiveness of topology and control strategy we proposed.