METHOD TO CONTROL THREE-PHASE BRIDGE CONVERTER Russian patent published in 2010 - IPC H02M7/5387 H02M7/5395 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and can be used to control power converters. Converter circuit comprises unit (1) of scaling setting current signals to current of converter DC side, DC power source (7) and set of six power keys connected in bridge circuit, circuit (2) to directly convert coordinates, unit (3) to calculate sector number, unit (4) to calculate reference signals and unit (5) of pulse-width modulation (WPM). WPM outputs and output of unit (3) make inputs of generator of control pulses for converter keys (6). Proposed control method consists in that currents are generated on converter AC side by forming two adjacent active current vectors and one zero vector in WPM period. Closed state of keys on one of the arms in bridge converter corresponds to every zero vector depending upon sector number. Proceeding from the analysis of preset phase current signal sings scaled to current on converter SC side, sector number is determined whereat preset phase current vector in current time interval is located. Phase current signals are converted from three-phase coordinate system a, b, c into stationary orthogonal system of α, β-coordinates, and, from obtained preset current projections on axes α and β,current vector lengths are calculated along directions of two active base vectors of the sector.

EFFECT: increased range of current converter output current main harmonics.

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