Research of fault current limiter based on half-controlled rectifier bridge for three-phase four-wire power system

The FCL(Fault Current Limiter) based on half-controlled rectifier bridge is proposed for three-phase four-wire power systems.Its current limiting principles and control methods are depicted in detail for the grounding faults of single phase,two phases and three phases.The rectifier bridge includes a couple of power diodes,which provides automatically the path for the continuing current of DC reactor.Whenever a fault is detected,the controllable switches in the fault phase(s) is simply turned off to drop out the fault phase(s) and the normal phase(s) keeps operating.Simulations with PSIM6 for various fault modes are carried out.An experimental FCL with small power capacity is established and investigated.Experimental and simulation results are conformable to each other,showing the validity and practicability of the FCL and its control strategy.