SSN Asynchronous Machines IM and DFIM with Rotor Turn Ratio and no Parasitic Load Requirement

This model implements 2 asynchronous machine models (wound and DFIM) compatible with SSN that does not require any parasitic load to be stable even in open stator conditions. DFIM has an explicit turn ratio number.

This model implements 2 asynchronous machine models (wounded and DFIM) compatible with SSN and that does not require any parasitic load or snubber in order to be stable even in open stator conditions.

The DFIM notably has an explicit turn ratio number, that allows real secondary voltage to be applied to the winding (no ideal transformer is required like in native SPS).

Demonstration

In this simulation, both rotor-cage and DFIM are driven near their nominal operating points. At 0.3 sec, the DFIM rotor load is short-circuited. Then, at 0.4 sec., the DFIM is disconnected from the main grid. As seen in this SSN simulation, the DFIM disconnection has no impact on the model stability despite the fact that it has no load connected to it after 0.4 sec. Using only SPS without SSN, the same model requires a 1 MW parasitic load at the DFIM stator to remain stable after 0.4 sec.

References

C. Dufour, D.S. Nasrallah, "State-space-nodal rotating machine models with improved numerical stability" Electrimacs 2017 conference, Toulouse, France