Error in Load Flow analyzer with Phase shifted Transformer

Hello,

I have the Problem that when i try to use the Load Flow Analyzer on my Simulation, i get the following Error: "An error in the model prevented the load flow analysis".

Now i know where this Problem comes from, but not how to fix it. I have a "Three-Phase Transformer (Two Windings)" that i need to use with 150Degree Phase-Shift. That is obtained by connecting the output terminals of delta winding to the appropriate phases of the network.

I read somewhere that this connections, e.g. a is connected to B, causes the Load Flow analyser to show the error message. How do i get around this and also keep the 150 Degree Phase shift in my Model/Transformer?

Choosing a Phase angle in the "Three-Phase Source" just resets to 0 when i run the Load flow analyzer.

Thanks in advance,

Enes

Answer 1

[CHANDRA BABU GUTTIKONDA]

Use the transformer’s winding connection + clock position (e.g. Yd5/Dy5 for ±150°) instead of manually cross-connecting delta terminals.

[Enes]

Thanks for the answer, however there is no option for "Clock position".The documentation for a "three-phase Transformer (two windings)" also states that this phase shift is done by connecting the output terminals of delta winding to the appropriate phases of the network. I am using Mathworks R2023a.

[Deepak]

Simulink’s Three-Phase Transformer (Two windings) block in R2023a does not include a direct "clock position" setting. Instead, as the MathWorks documentation confirms, the phase shift (such as the 150° shift in a DY-N11 configuration) must be implemented manually by connecting the delta winding terminals to the appropriate phases of the network. The documentation link is pasted below:

https://www.mathworks.com/help/sps/powersys/ref/threephasetransformertwowindings.html

So yes, for DY-N11 behavior, the correct approach in Simulink is to wire the secondary (wye) side such that phase A connects to phase B, B to C, and C to A. This manual cross-connection effectively introduces the 150° phase shift, just as the physical transformer would.

Hope this helps!