RECUPERATING ALTERNATING CURRENT DRIVE WITH TWO-LINK FREQUENCY CONVERTER Russian patent published in 2016 - IPC H02P3/18 H02P27/06 H02M5/453 

FIELD: machine building.

SUBSTANCE: invention can be used in frequency-controlled electric drive of alternating current, in particular, in hoisting mechanisms, and is intended for recuperation of electric power supply mains in mode of generator braking when heavy load. Electric drive to recover electric energy in supply mains in generator mode of braking, has a controlled three-phase bridge rectifier, consisting of a fully controlled semiconductor bridge on IGBT-transistors with free-wheeling diodes; link of DC voltage to capacitor; voltage inverter; asynchronous motor; control system controlled three-phase bridge rectifier. In each arm of controlled three-phase bridge rectifier includes IGBT-transistors with free-wheeling diodes, connected anti-parallel valves of cathode group controlled three-phase bridge rectifier. Constant voltage circuit comprises current sensor and voltage sensor. To control current recovery in mode of generator current control unit is introduced in braking control system controlled three-phase bridge rectifier, in which for preventing through currents in generator mode braking provides logic elements.

EFFECT: broader functional capabilities owing to recuperation of electric power network irrespective of voltage on capacitor DC link in mode of generator motor braking.

1 cl, 5 dwg