METHOD OF FREQUENCY CONVERTER CONTROL Russian patent published in 2013 - IPC H02M7/12 H02M7/527 H02M7/53862 H02M7/5395 

FIELD: electricity.

SUBSTANCE: in the method of frequency converter control with width-pulse modulation the moments of generation of frequency converter power key control signals are additionally changed at each switching interval in accordance with a random law, leaving the average number of switching intervals at each period of output voltage as permanent. Changing the moments of generation of frequency converter power key control signals is carried out by means of additional modulation in accordance with a random law (on each switching interval) of speed of reference saw-toothed high-frequency voltage or low-frequency control voltage growth. As a result the high-frequency spectrum of output voltage of the frequency converter is smeared, i.e. spectral components of combination harmonics are broken. Amplitudes of separate high-frequency harmonics are reduced, and the harmonic spectrum of the output voltage of the inverter is smeared simultaneously with reduction of specific energy of discrete frequencies.

EFFECT: improved weight and dimension parameters of an output filter with simultaneous increase of electromagnetic compatibility of a device as an independent unit, also within power supply systems.

3 cl, 4 dwg