METHOD FOR REDUCING VOLTAGE HIGHER HARMONIC COMPONENTS Russian patent published in 2018 - IPC H02J3/01 

FIELD: electricity.

SUBSTANCE: physically, the amplitudes of the higher harmonics of the voltage decrease due to a change in the impedance of the power supply system. Since the inductive resistance increases directly in proportion to the current frequency, even a slight increase in it at the frequencies of the higher harmonics leads to significant changes in the amplitudes of the voltage harmonics at the common connection point. When adjusting the number of turns of the transformer windings, the reduced resistance of the system varies in proportion to the square of the transformation coefficient, so its change is reflected in the magnitude of the inductive resistance. To reduce voltage distortions by means of switching the number of turns of a power transformer, the coefficient k_THD - slope of the curve of the harmonic distortion coefficient versus the voltage on the secondary winding. Then, according to the formula, the required transformation ratio is selected. The transformer ratio of the power transformer is changed by the value determined by the formula.

EFFECT: improving the quality of electricity.

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