FIELD: electrical engineering.
SUBSTANCE: invention relates to electrical engineering, particularly to power electronics, and can be used in transformer substations. Device for stabilization of three-phase voltage is intended for connection at low side of power transformer of substation. It comprises series-connected input frequency converter with DC link, step-down six-phase high-frequency transformer with a circular rotating field and an output frequency converter, which is a six-phase-three-phase zero cyclo-converter. Input frequency converter increases the frequency in multiples of the number of phases and frequency of the network and comprises a transistor rectifier with PWM with input sinusoidal capacitive current and double-bridge voltage inverter made on the basis of two single-phase bridge circuits with PWM with sinusoidal generation of output currents. Output frequency converter from six-phase voltage at the output of the high-frequency transformer forms an adjustable positive or negative three-phase additional voltage with frequency equal to the network frequency. This adjustable additional voltage, summing up with voltage of secondary winding of power transformer, provides substation consumers with stable voltage. Stabilization of voltage on load is performed by rectifier and double-bridge voltage inverter by voltage deviation of circuit and cyclo-converter as to voltage deviation on load.
EFFECT: simplification of the device and improvement of power characteristics of the transformer substation.
1 cl, 1 dwg
