Why do I get an error about inductors connected together when simulating a model in ideal switching mode in SimPowerSystems?

I have problems with simulating a SimPowerSystems model in ideal switching mode.

My model contains B6-Bridges in parallel controlled by PWM pules. They are connected with small inductivities and with a LC Filter to a voltage source. 

Why do I get the error that "The following inductors are connected together" only in certain switching states, and not always?

Why does SimPowerSystems error out that "the following inductor is open-circuited’ although it is ultimately still connected to the rest of the circuit? 

 

Answer 1

[MathWorks Support Team]

This is particular to the Ideal switching mode:

The circuit topology is re-evaluated every time a switching event occur. If it appears, among other things, that two inductors are being connected in series, or suddenly being left unconnected, SPS will signal it as an invalid topology (two inductors with different flowing currents cannot be forced to be in series or a current flowing in an inductor cannot be interrupted instantaneously ).

In summary the switching device method connects the inductors together at certain simulation time, or connects inductors in open-circuit