| 摘要 |
PURPOSE:To obtain a small and inexpensive inverter control circuit by detecting current flowing into an auxiliary machine and adding the detection result to an AC power command of system frequency outputted from an AC waveform operating unit and then employing the sum, as an output current command of an inverter, in the drive control. CONSTITUTION:Dividers 62, 64 output direct-axis current command Id* and quadrature-axis current command Iq*, respectively. An AC waveform operating circuit 46 operates an AC current command I*sin(omegat+theta*) synchronized with system frequency based on the direct-axis current command Id* and the quadrature-axis current command Iq*. An adder 48 adds a current I2 flowing through an auxiliary machine to the difference between the AC current command I*sin(omegat+theta*) and the output current I0 from an inverter 14, and the output from the adder 48 is fed to a regulator 50. Output current command from the inverter 14 is fed through the regulator 50, a comparator 52 and a driving circuit 54 to a control valve for the components of the inverter 14. |
