FIELD: electrical engineering, applicable for frequency conversion of multiphase alternating current.
SUBSTANCE: the method is based on the fact that the power switches of an active rectifier and self-excited inverter are controlled with the aid of two control channels, in this case the standard modulating signal defining the switching function in one channel is subjected in succession to phase and amplitude premodulations, pulse-length modulation and phase modulation, in the other channel - it is subjected to amplitude and adapting premodulation an in pulse-length modulation with the use of a high-frequency reference signal.
EFFECT: eliminated distortions of the useful components of output voltages.
6 cl, 6 dwg
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