DEVICE FOR CONTROL OF THREE-PHASE THREE-LEVEL ACTIVE VOLTAGE RECTIFIERS Russian patent published in 2020 - IPC H02M5/451 

FIELD: electricity.

SUBSTANCE: invention relates to the field of power conversion equipment and can be used for control of three-phase three-level active voltage rectifiers of voltage of high-voltage frequency converter as at rated mains voltage, and at short-term asymmetric failure of mains voltage. Device for control of three-phase three-level active voltage rectifiers is additionally equipped with fourth coordinate conversion unit (20), first (21) and second (22) low-pass filters, fifth coordinate conversion unit (23), inverting unit (24), in addition, unit of proportional-integral current controllers (13) includes first (25) and second (26) units of proportional-integral current controllers, second (27), third (28) and fourth (29) subtraction units, third adder unit (30), first (31) and second (32) crosstalk compensation units. Proposed control device improves operating reliability of active voltage rectifiers due to improved control system, which limits increase in phase currents of rectifiers during short-term asymmetric voltage failure of three-phase power supply source, and also limits swing of voltage fluctuation on capacitors of DC link of active rectifiers within allowable values. Besides, due to introduction of low-pass filters into control system efficiency of active rectifiers and reliability of operation of high-voltage frequency converter as a whole is increased.

EFFECT: technical result consists in creation of improved control system, which limits increase in phase currents of three-phase three-level active rectifier during short-term asymmetric voltage failure of three-phase power supply source, reduces number of false actuations of active rectifier switches due to introduction of low-pass filters into control system, and also limits swing of voltage fluctuation on capacitors of DC link of active rectifier within allowable values.

1 cl, 8 dwg