| 摘要 |
PROBLEM TO BE SOLVED: To surely estimate output currents of phases and to use them for control by securing a detection time of a DC bus current while reducing total inter-line voltage distortion by reducing a correction amount of a voltage command value.SOLUTION: In the case where a deviation between a maximum value and an intermediate value of the voltage command value is smaller than a predetermined value in a first half cycle of a carrier, a first correction value is added/subtracted to/from the maximum value and the intermediate value and corrected command values of a maximum phase and an intermediate phase are generated by first and second signal generation means 22. In the case where a second deviation between the intermediate value and a minimum value is smaller than a predetermined value in a latter half cycle of the carrier, a second correction value is added/subtracted to/from the intermediate value and the minimum value and corrected command values of the intermediate phase and a minimum phase are generated. In a next carrier cycle, a corrected command value is generated by using a value that cancels the first and second correction values. On the basis of gate information, phase current restoration means 27 detects the DC bus currents in the first half cycle and the latter half cycle, respectively, in predetermined timing. |
