FIELD: power engineering. SUBSTANCE: device designed for voltage regulation and balancing at low-voltage side of transformer substation has two three-phase bridges with single-phase high- frequency step-down transformer inserted between them. First bridge (modulator) is, essentially, direct-acting three-phase/single-phase high-frequency converter using artificial switching and pulse-width voltage regulation. Second bridge (demodulator) is direct-acting single-phase/three-phase low-frequency converter that employs natural switching and additional phase control (balancing) of three- phase voltage across load. EFFECT: reduced mass and size, improved speed of response. 2 cl, 3 dwg
