Asymmetric delta multi-pulse transformer rectifier unit, and associated systems and methods

A method for designing an asymmetric transformer having a first coil, a second coil, a third coil, and a galvanic isolation, wherein each coil comprises a primary winding and a secondary winding, wherein each secondary winding is an asymmetric secondary winding comprising a secondary delta winding and a plurality of secondary correction windings, and wherein the galvanic isolation is configured for electrically isolating primary windings from secondary windings, the method comprising:

• selecting turns count for the primary windings of the coils;
• selecting turns count for each of the secondary delta windings of the coils;
• selecting tap points for secondary correction windings along a first secondary delta winding of the first coil, a second secondary delta winding of the second coil and a third secondary delta winding of the third coil, wherein the tap points divide each of the first secondary delta winding, the second secondary delta winding and the third secondary delta winding into segments;
• constructing transformer vector diagram using an equilateral triangle with leg lengths proportional to a number of turns between secondary corner phases, wherein each side of the triangle represents one of the first, second and third secondary delta windings;
• drawing lines representing individual secondary correction windings off of each tap location along the first, second and third secondary delta winding, wherein:
• each line is represented as a vector of a first plurality of vectors with a phase equivalent to a phase of the coil the secondary correction winding is wound upon and length proportional to secondary correction windings turns count, and
• each vector of the first plurality of vectors runs parallel to one of sides of the triangle;
• determining each secondary correction winding's turns ratio by the length of a corresponding vector of the first plurality of vectors;
• and
• determining a number of turns in each second correction winding as a multiple of the turns ratio and the number of turns in the complete secondary delta winding.