Frequency Converter Portable, Alternating Current Multifrequency, 10 kW. Volume III.

The initial phase of the project was the development of a breadboard circuit capable of performing all the electrical functions of a three-phase frequency converter. After demonstration of three-phase performance, the work scope was extended to further develop the breadboard circuits to produce 10 kW of single-phase power at 60 Hz or 400 Hz. Concurrent with development of the 10 kW frequency converter, Delco developed improved step voltage commutation methods for a 100 kW frequency converter under MERDC Contract No. DAAK02-72-C-0338. Since some circuit advances were applicable to the 10 kW frequency converter, the work scope was enlarged to incorporate the new circuits into the breadboard. After three-phase and single-phase performance was demonstrated, an additional investigation was added to the work statement. This involved demonstration of 15 kVA three-phase and 10 kVA single-phase operation of the breadboard, study of voltage regulation methods for operating the frequency converter from utility power, and performance of regulation tests with a Delco-developed voltage regulation system. Additional inverter circuit developments Item 0006 made it possible to replace the transistor step commutation circuits with thyristor circuits. The results of the investigations and developments of Item 0006 are included in this volume of the contract final report.