Abstract
The output current of grid-connected PV inverters should not excess harmonic contents. Also, because they are driven connected with grid, the reliability of electric power’s quality should be secured. But, the current controllers of the grid-connected PV inverter decrease the electric power’s quality due to not considering the harmonic contents of the output current. This paper proposed the current controllers of the grid-connected PV inverters to supplement the decrease of the electric power’s quality because of the harmonic contents of the electric power’s quality and the harmonic contents of the output current. The proposed current controllers controlled the harmonic contents of the output current by controlling gains of the current controllers in consideration of the harmonic contents of the output current. As a result, when total harmonic distributions of the grid voltage were 0.4% and 4.1%, the excellence of the proposed current controllers was shown through the experience, by obtaining excellent results of being controlled low as the total harmonic distributions of the output current were 0.756% and 0.78% respectively.
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