APPLICATION OF THE THIRD HARMONIC CURRENT INJECTION IN THREE-PHASE THYRISTOR RECTIFIERS TO REDUCE THE INPUT CURRENT HARMONIC DISTORTION

摘要

Application of the third harmonic current injection in three-phase full-bridge thyristor rectifiers is analyzed in this paper. Results of the optimal current injection for diode bridge rectifiers are generalized for the thyristor rectifiers. It is shown that for the optimal third harmonic current injection, the current injection network takes 8.571 % of the rectifier input power from the thyristor bridge output terminals, regardless the thyristor firing angle. A current injection network with passive resistance emulator that, provides recovery of the power taken from the thyristor bridge output terminals is proposed. The results are experimentally verified on a 2 kW rectifier model.