Date of Award


Degree Type

Master's Essay - Restricted

Degree Name

Master of Science (MS)


Electrical and Computer Engineering


The question of a direct method of frequency conversion without the use of an intermediate D.C. link has teased researchers in industry and academics for a long time. Mathematically direct frequency conversion was possible, but it was plagued by such practical problems as the unavailability of devices (switches) which could very rapidly and effectively switch bidirectional currents at considerable levels of output power. As more high power bipolars began to appear, direct frequency conversion became a much more feasible proposition. This study used such bipolars to construct a power frequency converter capable of realizing the mathematics proposed by Hazeltine. These bipolars do not need external methods of commutation, making switching easier and quicker. The result is an economical, effective and rugged method of frequency control.