Power conversion device

Abstract

This power conversion device comprises: a converter (1) that converts AC power supplied from an AC power supply (6) into DC power and supplies the DC power to DC lines (L1, L3); capacitors (C1-C4) that are connected to the DC lines (L1, L3); an inverter (3) that converts the DC power received from the DC lines (L1, L3) into AC power and supplies the AC power to a load (8); and a control device (5) that controls the converter (1) so that the DC voltage (VD) of the DC lines (L1, L3) becomes a reference voltage. The control device (5) detects, on the basis of at least either the DC voltage (VD) of the DC lines (L1, L3) or the load current flowing through the load (8), a transient change in which the load (8) changes suddenly. The control device (5) temporarily increases the control responsiveness of the DC voltage (VD) by the converter (1) in response to the detection of the transient change of the load (8).

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