ELECTRIC ENERGY QUALITY IMPROVEMENT METHOD Russian patent published in 2013 - IPC H02J3/01 H02J3/28 

FIELD: electrical engineering.

SUBSTANCE: one measures instantaneous values of three-phase mains voltage, converting them from the three-phase abc coordinate system into the two-phase dq coordinate system; one generates signals proportional to the mains voltage d and q components, reference signals for the mains voltage positive sequence d and q components, comparison signals for the mains voltage d and q components by way of integration; one isolates harmonical components with maximum amplification factor in d and q components, generates control signals for d and q components by way of subtracting the corresponding isolated harmonical components from the comparison signals, converts the control signals from the two-phase dq coordinate system into the three-phase abc coordinate system; from the mains voltage zero sequence one isolates (with maximum amplification factors) the finite number of harmonical components with largest amplitudes, generates a correction voltage within the abc coordinates system proportional to the signals generated by way of subtracting harmonical components isolated within the mains voltage zero sequence from the corresponding converted control signals; ultimately, one sums the obtained correction voltages, in the bootstrap form, with the mains voltages.

EFFECT: increased symmetry of voltages and stability of the feeding mains voltage positive sequence parameters.

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