| 摘要 |
PROBLEM TO BE SOLVED: To achieve means for suppressing low-frequency pulsation that occurs in motor current by feedback control applicable even with a modulation factor of 100%.SOLUTION: A power conversion device comprises: a direct-current power supply; a smoothing capacitor; a first power converter; an alternating-current motor; alternating current detecting means; first coordinate transformation means; and first current controlling means. The power conversion device comprises: means for detecting a low-frequency component of an alternating current detection value detected by the alternating current detecting means; and second current controlling means that operates alternating-current voltage output by the first power converter so that the low-frequency component of the alternating current detection value becomes zero. |
