CIRCULATING CURRENT AND OSCILLATING CURRENT SUPPRESSING METHOD AND PARALLEL INVERTER DRIVER SYSTEM

摘要

A circulating current and oscillating current suppressing method and parallel inverter driver system are disclosed. Each inverter driver outputs a suppressing three-phase current to a motor and has an entity inductance device and a virtual inductance device. The virtual inductance device receives and sums the suppressing three-phase current of the inverter drivers, and generates a compensated three-phase current according to the suppressing three-phase currents, an impedance of the motor and an ideal impedance value generated by a virtual inductance unit and the entity inductance device. Consequently, the oscillating current of the transition three-phase current outputted from a switch device of the inverter driver can be reduced. In addition, the circulating current suppressing device generates a corrected three-phase voltage command according to a zero-sequence current and/or the circulating current quantity of the parallel inverter driver system, thereby suppressing the zero-sequence current and the circulating current of the parallel inverter driver system.