MULTIZONE REVERSIBLE CONVERTER AND METHOD OF ITS CONTROL

摘要

FIELD: electricity.SUBSTANCE: multizone AC reversible converter contains parallel key bridges, transformer with one or more secondary windings, diode leg that forms circuit of full-wave rectifier bridge with potential zone-phase regulation which is connected to commutator motor, current sensor of the primary network and voltage sensor of the primary network connected to control system. Each key-controlled leg consists of series-connected diode and controlled electronic switch and for this purpose IGBT transistor (module) can be used. In case of zone-phase control of reversing converter after the moment of voltage transfer through zero at first voltage from fine winding is supplied by means of key-controlled legs to electric motor; then after while additional voltage is supplied from auxiliary winding of transformer and after while this voltage supply is stopped. Time of auxiliary winding of transformer on and off is selected do that line current shift in regard to the mains voltage at the first harmonic of the mains frequency is reduced up to zero.EFFECT: increasing power factor.4 cl, 2 dwg