Harmonic Analysis of AC-to-AC Frequency Converter

Direct ac-to-ac frequency converters can be built using solid-state devices. This paper is primarily concerned with three-phase to single-phase converters where the output frequency is greater than the input frequency. In these converters, the input power factor and the harmonics of the input and the output currents vary with the output frequency. A digital simulation of an idealized three-phase to single-phase converter is used to predict the harmonic content of the input and the output currents. The results thus obtained can be used to design the input and the output filters to reduce the undesired harmonics.