A PV Micro-Inverter System Using Repetitive Current Control
Lenisha Vincent Chirayath1,R.NarcissStarbell2
1Lenisha Vincent Chirayath, Department of Electrical and Electronics Engg. Karunya University, Coimbatore, India.
2R.NarcissStarbell, Department of Electrical and Electronics Engg. Karunya university, Coimbatore, India.
Manuscript received on November 14, 2012. | Revised Manuscript received on December 21, 2012. | Manuscript published on December 30, 2012. | PP: 313-316| Volume-2, Issue-2, December 2012.  | Retrieval Number: B0949112212 /2012©BEIESP

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Abstract: Thisproject work proposes a grid-connected photovoltaic (PV) micro-inverter system and its control implementations. A dc-dc converter is used to interface the low-voltage PV module with load. A full-bridge pulse width-modulated inverter is cascaded and injects synchronized sinusoidal current to the grid. A plug-in repetitive current controller is proposed to regulate the grid current. Repetitive controller (RC) is suitable to eliminate periodic errors in a nonlinear dynamical system. In order to achieve high accuracy in the presence of periodic uncertainties, RC can be employed to remove the line side current harmonics in this work. High power factor and very low total harmonic distortions are guaranteed under varying load conditions. The model of the proposed scheme employing a repetitive current control in PV micro-inverter has been built using MATLAB/Simulink. 
Keywords: Boost Converter, grid-connected photovoltaic (PV) system, photovoltaic micro-inverter, repetitive current control.