The synchronous switching of motor power supply from frequency converter to grid for an AC drives with field-oriented vector control

The report is dedicated to the closed-loop design for a phase locking and a magnitude balancing of the three-phase inverter voltages to the three-phase grid voltages when the AC motor stator windings are switched to the AC power supply from the power frequency converter and backwards. The proposed control strategy for the AC drive with IGBT-inverter allows to decrease an inductance of current-balancing reactor and to avoid the operation under fault conditions after current surges.