CONTROL METHOD OF MULTIPLE-PHASE RECTIFIER UNIT Russian patent published in 2010 - IPC H02M7/12 H02M7/162 

FIELD: electricity.

SUBSTANCE: in control method of multiple-phase rectifier unit the smooth control of rectified voltage of the above rectifier unit is performed by changing the output voltage of three-phase bridge independent voltage inverter with sinusoidal pulse-width modulation, the input pins of which are connected to direct current mains of additionally introduced three-phase rectifier unit, and its output pins are connected to primary winding of three-phase matching transformer. Secondary phase windings of matching transformer are connected phase by phase in series with power windings of converter transformers Change of output voltage of independent voltage inverter is provided by controlling either of phase, or amplitude, or both values of sinusoidal modulation voltage. Valveside windings of converter transformer of additionally introduced rectifier unit are directly connected to AC outputs of diode bridge which is connected on DC side to DC outputs of independent voltage inverter. Secondary phase windings of matching transformer are connected to power windings of converter transformers either directly, or by means of compensating device with fifth and seventh harmonics of current in capacitors. Valveside windings of converter transformers are connected to AC outputs of rectifier bridges either directly, or by means of similar compensating device. Converter transformer of additionally introduced rectifier unit is made on independent three-phase magnetic circuit. Converter transformers of the unit are made either on independent, or combined magnetic circuits. Rectifier bridges of the unit are connected either parallel, or in series.

EFFECT: simplifying and increasing power coefficient.

10 cl, 8 dwg