An equivalent magnetic circuit coupled model of PMFCL for transient simulation

With several incomparable merits such as small size, compactness, reliable operation and zero reset time, the permanent-magnet-biased saturated iron core fault current limiter (PMFCL) has attracted the interests of many researchers for its prospective commercial application in power systems. In this paper, a series of formulae to model the magnetic circuit coupling in PMFCL have been presented. The equivalent magnetic circuit coupled model can be used to simulate the transient behavior of the PMFCL using MATLAB software. In order to verify the magnetic circuit coupled analysis, a small PMFCL prototype was investigated simultaneously. The experimental measured results were in agreement with the results obtained from modeling and they confirm the validity of the equivalent magnetic circuit coupled model. The results showed that, the proposed method of magnetic circuit coupled analysis is convenient for research into the use of PMFCL in power systems.