I need a YDd three-winding three-phase transformer model for PLECS.
To be specific:
Winding 1 (Y-connected): INPUT from generator 3-phase Set 1
Winding 2 (D-connected): INPUT from generator 3-phase Set 2 (30° offset)
Winding 3 (d-connected): OUTPUT, combined 3-phase
This is for a MVDC power system with a 6-phase synchronous generator. Both Y and D windings are inputs, and the single delta winding is the output.
I saw that @RetoChristen shared Ddy models on this forum and mentioned Ddy/Ddz may be added to the library. Could you please build and share a YDd model file as well? I am using PLECS Standalone 4.9.4 with CPU Codegen, so Codegen compatibility is required.
Please refer to the attached model. It shows a comparison between an electrical and equivalent magnetic circuit model for Ydy and Ddy transformers.
The electrical models support different phase shifts on the secondary and tertiary windings as well as saturation. The electrical model implementation can be somewhat confusing due to the degree of configurability, motivating the inclusion of the magnetic domain to build the transformer model. The resulting connections and winding arrangements may be clearer for the given (non-configurable) winding arrangement. Also, in the future changing any connection of the terminals for Y, D, different vector groups, or adding more phases becomes simpler. Of course you can always construct your own electrical equivalent as well which may make the vector group arrangement clearer if you omit the ability to specify the phase shift as an input parameter.