ABSTRACT
With the increase of DG in distribution network, good management of these systems is faced with new challenges. One of the most DG sources is doubly-fed induction generator (DFIG). By connecting them, the short circuit level (SCL) of network has been increased and it may be exceeded over the capacity of equipment such as breaker. So reliability will reduce in compare with the absence of DFIG in the network. In this paper, the superconducting fault current limiter (SC-FCL) has been used as a new technology for reducing large fault currents, increased security, reliability and stability of DFIG transient. Dynamic Model of SC-FCL is simulated with regard to all basic details including control algorithms, sequence of operation and error detection techniques in (PSCAD/EMTDC) software. Different cases with DFIG connected to the network and the impact of SC-FCL on it have been investigated. The result show that SC-FCL limits the fault current contribution of DFIG to a certain amount (that is improve the security and transient stability of DFIG during short circuit in the network) and operates as a compensator in such situation. Voltage sag as a very important index in power quality improves at the point of DFIG connection to grid.
