[challenge] of changes in system conditions simply corresponds to the harmonic current suppression device available. [MEANS FOR SOLVING PROBLEMS] to obtain the current of the d, q-axis component and a variation in the current flowing to the drive command value of the electric power conversion device 10, a current control unit for controlling the inverter on the basis of an output of the deviation (20); Dq conversion unit converts the output current of the LCL filter 11 in the d, q-axis for detecting a harmonic of a predetermined order to the direct-current value 41 and a LPF (42d, 42q); Output current, harmonics current command value output from the filter is detected on the basis of the current disturbance factor, defined as the inverse of the transfer function of the value for estimating the harmonic disturbance observer (43); Obtaining a deviation of the command value to suppress disturbances on the estimated harmonic disturbances and the disturbance consists of a d, q-axis current command value harmonics harmonic inhibitor fisherman for calculating (Ihdref, Ihqref) (40), d of the current control unit 20 , the q-axis current command, the harmonic current suppression device by superimposing the harmonics current command to suppress harmonic current. ;
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