A method of controlling a power conversion apparatus which comprises: a first power supply line and a second power supply line; a rectifier for full-wave rectifying an AC voltage to be inputted to output a rectified voltage to between said first power supply line and said second power supply line; a capacitor provided between said first power supply line and said second power supply line, wherein the capacitor has a value such that a voltage across both ends of the capacitor has a pulsating component caused by full-wave rectification of said AC voltage in the rectifier; a reactor constituting a LC filter, together with said capacitor; and a power converter for converting a DC voltage (Vdc) supported by said capacitor into an AC voltage on the basis of a switching signal to be inputted, said method comprising the steps of: detecting a voltage of said reactor; making a correction on the basis of said voltage of said reactor so that a first voltage control rate command (ks**) which is a ratio of an amplitude of said AC voltage to an average value of said DC voltage increases as a harmonic component of said DC voltage becomes higher to generate a second voltage control rate command (ks*); and giving said switching signal which is generated on the basis of said second voltage control rate command to said power converter, characterized in that making the correction on the basis of said voltage of said reactor so that said first voltage control rate command (ks**) decreases as an amplitude (Im) of an alternating current outputted from said power converter becomes larger. a first power supply line and a second power supply line; a rectifier for full-wave rectifying an AC voltage to be inputted to output a rectified voltage to between said first power supply line and said second power supply line; a capacitor provided between said first power supply line and said second power supply line, wherein the capacitor has a value such that a voltage across both ends of the capacitor has a pulsating component caused by full-wave rectification of said AC voltage in the rectifier; a reactor constituting a LC filter, together with said capacitor; and a power converter for converting a DC voltage (Vdc) supported by said capacitor into an AC voltage on the basis of a switching signal to be inputted, said method comprising the steps of: detecting a voltage of said reactor; making a correction on the basis of said voltage of said reactor so that a first voltage control rate command (ks**) which is a ratio of an amplitude of said AC voltage to an average value of said DC voltage increases as a harmonic component of said DC voltage becomes higher to generate a second voltage control rate command (ks*); and giving said switching signal which is generated on the basis of said second voltage control rate command to said power converter, characterized in that making the correction on the basis of said voltage of said reactor so that said first voltage control rate command (ks**) decreases as an amplitude (Im) of an alternating current outputted from said power converter becomes larger. detecting a voltage of said reactor; making a correction on the basis of said voltage of said reactor so that a first voltage control rate command (ks**) which is a ratio of an amplitude of said AC voltage to an average value of said DC voltage increases as a harmonic component of said DC voltage becomes higher to generate a second voltage control rate command (ks*); and giving said switching signal which is generated on the basis of said second voltage control rate command to said power converter, characterized in that making the correction on the basis of said voltage of said reactor so that said first voltage control rate command (ks**) decreases as an amplitude (Im) of an alternating current outputted from said power converter becomes larger.