HIGH VOLTAGE FREQUENCY CONVERTER CONTROL UNIT WITH ACTIVE RECTIFIER Russian patent published in 2023 - IPC H02M5/451 

FIELD: electric devices.

SUBSTANCE: device is additionally equipped with a unit for measuring the voltage at the input of the active rectifier (17), a unit for generating the setting current by the reactive component (18), a unit for comparing the voltage levels of the supply network with the voltage at the input of the active rectifier (16), the first, second and third inputs of the latter being connected to the fourth, fifth and sixth outputs of the power supply voltage measurement unit (1), and the fourth, fifth and sixth inputs are connected to the first, second and third outputs of the voltage measurement unit at the input of the active rectifier (17), three inputs of the latter are connected to a three-phase power circuit at the input of the active rectifier (15), while the output of the block for comparing the voltage levels of the supply network with the voltage at the input of the active rectifier (15) is connected to the input of the current generation unit for setting the reactive current component (18), the output of which is connected to the second input of the comparison unit actual current with the setting current by the reactive current component (10). This allows real-time assessment of the state of the supply network and, depending on the disturbance, forming the current of the task for consumption or generation of reactive power, which allows to reduce emergency shutdowns due to voltage dips (overvoltages) and reduce economic damage caused by equipment downtime.

EFFECT: increased reliability of the operation of frequency converters with active rectifiers in the event of short-term overvoltage or voltage dips in the supply network.

1 cl, 4 dwg