| 摘要 |
PURPOSE:To suppress the vibrating phenomenon of a main circuit by using the values obtained by individually adding the ultrafine compensation amount of the output current of each inverter to or subtracting from a common inverter frequency as the inverter frequency of each inverter. CONSTITUTION:A reference slip frequency calculator 26 calculates a reference slip frequency fSO on a basis of a current command value IC in response to a master computer command MC and a response load command VL, and a correcting slip frequency calculator 27 calculates a correcting slip frequency fS1 in response to a deviation between the mean value IMAV of the output current of inverters and the value IC. Differentiating compensators 31, 32 respectively calculate differentiating compensation amounts DELTAfS1, DELTAfS2 of the output currents IM1, IM2 of the inverters. A rotating frequency fr and signals FS0, fS1, DELTAfS1, DELTAfS2 are added or subtracted to obtain the inverter frequencies f1, f2 of the inverters 6, 7. |
