چكيده به لاتين
As the capacity of power grids keeps growing, the short circuit fault current is getting larger, and even exceeds the maximum capacity of the breaker. Fault current limiters (FCLs) are the new solutions to deal with this serious threat in future power systems, which connects to the network in series and is expected to play an important role in protecting future power grids. In recent years, there has been a growing research interest in saturated-core superconducting fault current limiters (SCSFCLs). Before that, there were some problems such as high weight and large size and when de-saturated, the magnetic core couples the AC and DC coils and a high voltage is induced on the DC coil, to address these difficulties, the present thesis presents an efficient three-phase SCFCL with one core. Generally, to bias the core into deep saturation, a high MMF is needed. Hence, in the improved SCFCL use PM. Selecting an improved structure SCSFCL is a complex process having a large number of design variables and constraints. In this thesis, to choosing the optimal number of three-phase windings, use Analytical Hierarchy process method (AHP).
The above tasks require advanced numerical techniques using FEA models in COMSOL Multi Physics, network simulation in PSCAD and numerical analysis in MATLAB to simulate the efficacy of an SCSFCL when placed on a simple system.
Keywords:
Saturated-core superconducting fault current limiters (SCSFCL); improved structure; three-phase configuration; permanent magnet (PM); Analytical Hierarchy process method (AHP) ; FEA simulation
