| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric power conversion system capable of reducing distortion of an output current.SOLUTION: A capacitor C1 is connected between a pair of DC lines LH and LL, and a DC voltage Vc is applied to them. An invertor 3 converts the DC voltage Vc into a second AC voltage. A control unit 6 generates a switching signal for controlling a switching element of the invertor 3 on the basis of a voltage command value of an amplitude of the second AC voltage. The control unit 6 allows at least one part of a period that a capacitor voltage is smaller than a rectification voltage Vrec to correct so that a value obtained by subtracting the rectification voltage Vrec from the capacitor voltage is larger as the voltage command value is large (i), and does not allow at least one part of the period that a capacitor voltage is larger than the rectification voltage to correct (ii). The capacitor voltage at least includes a component in which the component of a switching frequency of the switching element of the DC voltage Vc is removed.SELECTED DRAWING: Figure 1 |
