FIELD: conversion equipment, control or stabilization of alternating voltage in single- and three-phase networks and electric installations. SUBSTANCE: procedure is based on high- frequency alternation of mode of shunting of booster transformer with mode of voltage addition or voltage subtraction and change of duty factor in process of mixed commutation of keys. Additional operations of this procedure allows modulation frequency of voltage boosting to be raised without change of frequency of commutation of keys and short-term closing of network via keys without development of choke condition of transformer to be prevented. EFFECT: improved energy indices and simplified process of voltage conversion. 2 dwg
