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Control Scheme for the Reduction of Peak Current and Current Harmonics in Grid Connected Photovoltaic Inverters

Jinu John, Alan M George

Peak current and current harmonics are main problems associated in a grid connected photovoltaic system under unbalanced voltage sag. During the voltage sag, the photovoltaic source should operate with increasing converter currents to maintain the injection of the generated power causes peak current in the system. There are number of grid fault controllers are used in voltage sag condition. Using these controllers, considering the condition of minimum peak current causes injection large current harmonics distortion during sag voltage. In this paper present a control scheme used to minimize peak current and current harmonics distortion, which can be implemented in unbalanced voltage sag condition.