The grid-connected power conversion apparatus based on the discontinuous voltage modulation method according to an embodiment of the present invention includes a DC voltage output from the DC power supply and an offset voltage for generating a first offset voltage based on a phase voltage command output from the current controller generator; A harmonic generator that is electrically connected to the phase locked loop and generates an nth-order harmonic (where n is an integer) based on a phase angle of the system output from the phase locked loop; And a control circuit for controlling the inverter circuit based on a polarity voltage command generated by adding the n-th order harmonic to the first offset voltage to generate a new second offset voltage and adding the second offset voltage to the phase voltage command And a signal controller for outputting a PWM signal.
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