FIELD: electrical engineering.
SUBSTANCE: invention relates to electrical engineering and can be used in power supply systems for regulating or stabilizing a three-phase sinusoidal voltage. The substance of the technical solution lies in the formation and alternate summation with the mains voltage of the N-th number of additional voltages of the six-step form, each of which is regulated in twelve subranges. Six of the subranges are in-phase and six are anti-phase shaping with respect to the mains voltage. When regulating the mains voltage in the direction of increase, N common-mode additional voltages are added to it in turn, and when regulating in the direction of decreasing, N anti-phase additional voltages are added in turn. The change in the sign of the additional voltage is carried out according to the sign of the feedback signal in the area of a given, for example nominal, value of the mains voltage at N=1.
EFFECT: reduction of currents flowing in the transistor blocks of inverters, transformation ratios of three-phase booster transformers and the power of the same type of booster cells in relation to the power of the network; improved sinusoidality and accuracy in three-phase voltage regulation.
1 cl, 1 dwg
