VECTOR METHOD FOR CONTROL OF THREE-PHASE STATIC CONVERTER WITH ASYMMETRIC LOAD Russian patent published in 2010 - IPC H02M5/27 H02P21/00 H02P9/42 

FIELD: electric engineering.

SUBSTANCE: in vector method of control they measure instantaneous values of three-phase output value of converter, voltage or current, zero, direct and reverse sequences of output value are detected, values are transformed from three-phase abc-system of coordinates into double-phase system of coordinates. Reference signals are generated for double-phase system of coordinates, as well as comparison signals, control signals are generated proportionally to results of comparison, which are transformed from double-phase system of coordinates into three-phase abc-system of coordinates, three-phase modulating signal of converter is generated. Identified signal of zero sequence is used to generate a signal orthogonal to it, and it is received as the second component of double-phase system of coordinates of zero sequence. All sequences are transformed into rotary dq-system of coordinates, reference signal for d-component of direct sequence is generated according to rated value of output value, reference signals for remaining components of sequences are generated as zero. Specified signals of comparison are generated for each component of sequences by integration of differences in according reference signals and d- and q- component sequences, and modulating signal is generated by summation of transformed control signals of direct, reverse and zero sequences in abc-system of coordinates.

EFFECT: generation of three-phase symmetric signal of output value with asymmetric load.

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