  With increased share of Static Frequency Converters (SFCs) in 16$\frac{2}{3}$
Hz railway grids concerns about stability have increased. Stability studies for
such low-frequency railway grids are few, and models that describe SFC dynamics
are especially few. This paper presents an open SFC model for electromechanical
stability studies in the phasor domain, suited for 16$\frac{2}{3}$ Hz
synchronous railway grids. The developed and proposed SFC model is implemented
in MatLab Simulink, together with grid and loads. Numerical studies are made,
in which the proposed SFC model is validated against both measured RMS-phasor
amplitude of voltage and current at the railway grid side of an SFC. The SFC
model developed is able to reproduce the measured RMS voltage and current with
an acceptable accuracy.
