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This paper proposes a compensation method for the 2 nd -order harmonic of single-phase grid-connected wind power generation

systems. Theoretically, a single-phase grid-connected inverter system has no choice but to cause the 2 nd -order harmonic 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 the 1 st and 3 rd -order harmonic. The proposed method can compensate, conveniently, the reference active current

with the 2 nd -order harmonic. To reduce the 2 nd -order ripple in the reference active current, proposed method takes a PR

controller as a feed-forward compensator. PR controllers can implement selective harmonic compensation without excessive

computational requirements; the use of these controllers simplifies the method. Both the simulation and experimental results agree

well with the theoretical analysis.