MATLAB: Is there an example that demonstrates how to build a three phase transformer with custom number of windings in SimPowerSystems 4.2 (R2006a)

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I need to construct a 24 pulse phase shifting auto-transformer in simulink with custom specifications. For example, I need a three phase transformer with a total of five coils per phase. There is only a three winding / three phase transformer in the SimPowerSystems library. However, there seems to be no multi-winding three phase transformer from which this can be constructed.

Best Answer

The attached example model 'PST.mdl' demonstrates how to build a three phase transformer with customer number of windings. The model is built with three Multi-winding transformers. The primary winding consists of five windings connected in series with four taps. The four secondaries are connected to the primary taps according to the wiring diagram attached.
In order to generate the winding nominal voltages used in the Multi-winding transformer blocks, use the 'DiffDelta.m' file. The 'DiffDelta.m' (also attached) generates the nine nominal voltages used in Multi-winding transformers.
 Primary voltages : Vp1 Vp2 Vp3 Vp4 Vp5 
 Secondary voltages :  Vs1 Vs2 Vs3 Vs4
To run the model:
1. Execute the following command at the MATLAB command prompt
   [WindingPossibilities,Vp1,Vp2,Vp3,Vp4,Vp5, Vs1,Vs2,Vs3,Vs4] = DiffDelta24p2_GS(690,10)
This will return the nine voltages in the workspace. It will also print a modified wiring diagram, showing the winding terminals.
2. Specify the sample time for the discretized model by executing the following command at the MATLAB command prompt.
Ts=50e-6
3. Run the PST_24pulses model.
The model is discretized. The transformer primary is assumed to be connected to a 690 V LL source. Five Sequence Analyzer blocks from the Extras/discrete measurement library are used to monitor the positive-sequence voltages of the four secondaries.
As expected, the four secondary three-phase voltages are phase-shifted by: +45, +15, -15 and -45 degrees. The secondary voltage magnitudes are 597.5 V rms LL. The transformer ratio is therefore 597.5/ 690 = 0.866.
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