15 kW general purpose frequency changer performance improvement

The 15 kW Frequency Changer performance improvement involved operation with a 220/380-volt ac source as well as demonstration of parallel operation and transient-free, on-bus/off-bus transfer with an alternate power source. This effort required design and construction of additional hardware to augment the Army/Delco Electronics developed 15 kW Frequency Changer, which is designed to operate from a 120/208-volt ac, three-phase power source. This report is organized into two major parts. The first deals with the operation of the 15 kW Frequency Changer with a 220/380-volt ac source, and the second deals with parallel operation and transient-free transfer. For demonstration purposes, 220/380-volt ac operation utilized the utility 60-hertz power source. The system was also configured to operate with the 50-hertz European power source. Conceptually the system was also suitable for use with a 400-hertz power source, but the input magnetics were designed for 50/60-hertz operation only. For demonstration purposes, parallel operation and transient-free transfer was accomplished with either the 60-hertz utility power or a turbine-engine generator set.