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<p>As the United States Navy moves toward the all-electric ship, the need for a robust,  high fidelity inverter for propulsion motors becomes mandatory. Military vessels require high  power converters capable of producing nearly sinusoidal outputs to prevent torque pulsations  and electrical noise that can compromise the mission location. This thesis presents a hybrid  pulse-width-modulated controller for a 3x3 Cascaded Multi-Level Converter (CMLC). Ancillary  results include a simple technique for extracting the reference sine wave from an independent  bulk converter and implementing a synchronization technique that coordinates a space  vector modulation controller with the switching pattern of a bulk inverter. The algorithms were  tested on CMLC hardware that resides in the Naval Postgraduate School Power Systems Laboratory,  and the results were compared with a sine-triangle pulse width modulation algorithm.  The controller and converter were used to power a quarter-horsepower three-phase induction  motor.
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<br>Subjects: Ship propulsion, Electric; Ships; Electric equipment; United States</div>
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Souhan, Brian E.</div>
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