Power conversion system and method

A power conversion system, comprising:

• n converters, each of the n converters having a converter output voltage, n being an integer greater than or equal to four;
• n−1 phase-shifted transformers, each of the n−1 phase-shifted transformers comprising an open star winding and a delta winding, and each of the n−1 phase-shifted transformers having a transformer electrical output, the n−1 phase-shifted transformers having a combined electrical output,
• wherein a first of the n converters is directly connected to the open star winding of a first of the n−1 phase-shifted transformers, and a second of the n converters is directly connected to the delta winding of the first of the n−1 phase-shifted transformers,
• wherein the transformer electrical output of an ith phase-shifted transformer of the n−1 phase-shifted transformers is directed from the open star winding of the ith phase-shifted transformer via a direct electrical connection to either of a load, or an open star winding of an i+1th phase-shifted transformer of the n−1 phase-shifted transformers, the delta winding of the i+1th phase-shifted transformer being directly connected to an i+2th converter of the n converters, i being an integer in a range from 1 to n−1 inclusive, and
• wherein the combined electrical output of the n−1 phase-shifted transformers is configured for direct connection to a load through the open star winding of the n−1th phase-shifted transformer;
• a controller configured to operate a plurality of switches of one or more converters of the n converters and thereby modulate the converter output voltages of the one or more converters such that fundamentals of the output voltages are additive and such that one or more harmonic orders produced by the modulation of the converter output voltages are eliminated or reduced at the combined electrical output of the n−1 phase-shifted transformers;
• and
• one or more DC voltage sources configured to power the n converters.