A Novel Three Limb Topology of a Saturated Core Fault Current Limiter in HVDC System

In order to protect high voltage direct current(HVDC) system from destructive damage caused by large DC fault current, a HVDC system saturable core type fault current limiter(DCSFCL) is proposed previously. However, through principle investigation and simulation analysis of DCSFCL, coil inductance of DCSFCL do not have a large changing rate (CR) when a fault occurs, so clipping performance of it will not be quite satisfying. In order to increase CR and improve clipping performance of original DCSFCL, further improvements need to be carried out. In this digest, a modified three limb structure of DCSFCL(TSFCL) is proposed and equivalent magnetic and electric circuit are analyzed. Simulations carried out on ANSYS shows that clipping performance is improved by a large scale.