Phase shift transformer in multi-level medium voltage inverter

摘要

A phase shift transformer in a multi-level medium voltage inverter is disclosed, wherein structure is modularized to provide layout freedom and to reduce volume and weight of an entire system, and a continuous operation of a motor is enabled, even if one module is faulted.

主权项

1. A phase shift transformer in multi-level medium voltage inverter, the phase shift transformer comprising:
a plurality of modularized phase shift transformers; and a plurality of power cells for driving a motor, each of the plurality of power cells connected to the plurality of modularized phase shift transformers to receive a plurality of input power signals from each of the plurality of modularized phase shift transformers, wherein primary windings of each of the plurality of modularized phase shift transformers are phase-shifted to each other at a predetermined angle, wherein secondary windings of each of the plurality of modularized phase shift transformers comprise a plurality of connections each phase-shifted at the predetermined angle, wherein a first and second of at least four of the plurality of input power signals in a first of the plurality of power cells are received from a first phase shift transformer, a third of the at least four of the plurality of input power signals in the first of the plurality of power cells is received from a second phase shift transformer, and fourth of the at least four of the plurality of input power signals in the first of the plurality of power cells is received from a third phase shift transformer, wherein a first and second of at least four of the plurality of input power signals in a second of the plurality of power cells are received from the second phase shift transformer, a third of the at least four of the plurality of input power signals in the second of the plurality of power cells is received from the first phase shift transformer, and a fourth of the at least four of the plurality of input power signals in the second of the plurality of power cells is received from a third phase shift transformer, and wherein a first and second of at least four of the plurality of input power signals in a third of the plurality of power cells are received from the third phase shift transformer, a third of the at least four of the plurality of input power signals in the third of the plurality of power cells is received from the first phase shift transformer, and a fourth of the at least four of the plurality of input power signals in the third of the plurality of power cells is received from the second phase shift transformer.