A direct power conversion apparatus comprising: a converting unit that includes a plurality of switching elements (Su, Sv, Sw, Sx, Sy, Sz) and that converts an AC power supplied from a single-phase AC power source to a three-phase AC power at a predetermined frequency and supplies the three-phase AC power to a motor a load torque of which periodically fluctuates; and a control unit that controls switching operations of the switching elements (Su, Sv, Sw, Sx, Sy, Sz), wherein the control unit performs at least one of first control and second control, the power conversion apparatus is characterised in that : the first control being control for generating an output torque of the motor having a waveform including a fundamental frequency component of the load torque a fundamental frequency of which is a frequency in accordance with a fluctuation period of the load torque and at least one of a fourth harmonic and a sixth harmonic of a power source frequency of the AC power source , the second control being control for generating the output torque having a waveform including at least one of a second harmonic and a third harmonic of the fundamental frequency of the load torque and a second harmonic of the power source frequency of the AC power source . a converting unit that includes a plurality of switching elements (Su, Sv, Sw, Sx, Sy, Sz) and that converts an AC power supplied from a single-phase AC power source to a three-phase AC power at a predetermined frequency and supplies the three-phase AC power to a motor a load torque of which periodically fluctuates; and a control unit that controls switching operations of the switching elements (Su, Sv, Sw, Sx, Sy, Sz), wherein the control unit performs at least one of first control and second control, the power conversion apparatus is characterised in that : the first control being control for generating an output torque of the motor having a waveform including a fundamental frequency component of the load torque a fundamental frequency of which is a frequency in accordance with a fluctuation period of the load torque and at least one of a fourth harmonic and a sixth harmonic of a power source frequency of the AC power source , the second control being control for generating the output torque having a waveform including at least one of a second harmonic and a third harmonic of the fundamental frequency of the load torque and a second harmonic of the power source frequency of the AC power source . the first control being control for generating an output torque of the motor having a waveform including a fundamental frequency component of the load torque a fundamental frequency of which is a frequency in accordance with a fluctuation period of the load torque and at least one of a fourth harmonic and a sixth harmonic of a power source frequency of the AC power source , a fundamental frequency component of the load torque a fundamental frequency of which is a frequency in accordance with a fluctuation period of the load torque and at least one of a fourth harmonic and a sixth harmonic of a power source frequency of the AC power source , the second control being control for generating the output torque having a waveform including at least one of a second harmonic and a third harmonic of the fundamental frequency of the load torque and a second harmonic of the power source frequency of the AC power source . at least one of a second harmonic and a third harmonic of the fundamental frequency of the load torque and a second harmonic of the power source frequency of the AC power source . <EOS>