A new generalized direct frequency converter

In this paper, the authors introduce a new direct frequency converter topology in which, by using the standard three-phase voltage waveform at the input, three-phase sinusoidal outputs of any desired frequency and amplitude can be generated. The harmonic content of output voltage is significantly less than other classical cycloconverters. It is illustrated that even under unbalanced and highly distorted input voltage waveforms, the output waveform turns but to be reasonably clean and balanced. In light of such good performance, the authors conclude that this new generalized direct frequency converter (GDFC) can be effectively applied as a controlled power source for AC or DC motor drives as well as an active filter.