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 This paper proposes a compensation method for the 2nd harmonics of grid-connected small wind power generation systems. Theoretically, a single-phase grid-connected inverter system has no choice but to cause the 2nd harmonics to DC-link voltage. The reference active current is affected by the DC-link voltage. The output current from the reference active current is distorted by 2nd harmonics. Unlike existing methods which compensates the reference of DC-link voltage, the proposed method can compensate, conveniently, the reference active current with the 2nd harmonics. The proposed method takes a PR controller as a feed-forward compensator to reduce the 2nd harmonics in the reference active current. The PR controller can implement selective harmonic compensation without excessive computational requirements; the use of these controllers simplifies the method. The simulation results agree well with the theoretical analysis.