The present invention relates to a grid-connected inverter current control system and apparatus, which use odd-harmonic reduction method. The grid-connected inverter current control system, in a grid-connected power generation system, comprises a converter for charging DC power supply using energy generated from a power generation part; an inverter for switching output power from the converter to a load or a grid; a filter part connected to an output of the inverter to eliminate switching harmonics; a synchronization processing part for processing synchronization of voltage of the grid and output current of the inverter; and a controller for detecting characteristics of the output current of the inverter by sensing voltage and current inputted into or outputted from the inverter and sensing the voltage of the grid, generating current controlling data for the output current of the inverter using an odd-harmonics reduction algorithm, and controlling PWM for the inverter based on the generated data, thereby acquiring wave information of the output current of the inverter by sensing the output current of the inverter, and reducing the total harmonic distortion (THD) of current of the gird-connected inverter through a harmonic reduction method.;COPYRIGHT KIPO 2014;[Reference numerals] (110) Power generation part; (140) Synchronization processing part; (150) Odd-harmonics reduction part; (160) MPPT control part; (170) LCL filter part; (180) PI control part; (AA) Load side
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