| 摘要 |
PURPOSE:To improve the stability of control by eliminating an amplitude and a phase error between the set value of a polyphase current and a polyphase AC current supplied actually to a load. CONSTITUTION:A commanding device 150 outputs the 1st reference current value I1alpha* and the 2nd reference current value I1beta* of the amount of a direct current, and a phase angle, which are supplied as current command values to a power converter 20, supplying a three-phase AC current to the load 600 on the basis of those commands. Namely, a detector 450 obtains the 1st actual current value I1alpha and the 2nd actual current value I1beta by using load currents i1U-i1W. Comparators 251 and 252 compare the command values of the amount of the direct current with the actual values at any time. Consequently, the current command values coincide with the actual load currents completely regardless of an output frequency. |
