International Journal of Emerging Trends in Science & Technology

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Grid Connected PV Power Generating System Using CUK Converter and Transformer less H5 Inverter


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1 Department of Electrical and Electronics Engineering, Sri Krishna college of Engineering and Technology, Kuniamuthur, Coimbatore, India
     

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This paper presents the PI controller based CUK converter and transformer less H5 inverter for grid connected photovoltaic power generating system. For the maximum power point tracking of the photovoltaic system, P&O based algorithm has been implemented. The Pi controller for the CUK MPPT scheme shows a regulated output in variable load conditions. A classical H-bridge inverter topology with extra fifth switch has been used to connect the single phase grid. For the traditional grid connected PV inverter system, a transformer is utilized to provide the galvanic isolation between the grid and PV system. But Common mode leakage current increases due to the removal of the transformer from the system. Here, this transformer less H5 inverter is used for the proposed system which suppresses the common mode leakage current thereby improving the power conversion efficiency and decreases the grid current distortion. The removal of the transformer from the grid tied PV inverter system will give an improvement in the efficiency factor and reduces the cost of the system. The performance of the proposed system is tested in MATLAB/SIMULINK software and the simulation results are included for the effective demonstration of the converter and inverter efficiency. The results of the grid voltage and grid current have been analyzed and the total harmonic distortion of the PV inverter system has been verified.
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  • Grid Connected PV Power Generating System Using CUK Converter and Transformer less H5 Inverter

Abstract Views: 228  |  PDF Views: 2

Authors

R. Rubia Gandhi
Department of Electrical and Electronics Engineering, Sri Krishna college of Engineering and Technology, Kuniamuthur, Coimbatore, India
J. Karthika
Department of Electrical and Electronics Engineering, Sri Krishna college of Engineering and Technology, Kuniamuthur, Coimbatore, India

Abstract


This paper presents the PI controller based CUK converter and transformer less H5 inverter for grid connected photovoltaic power generating system. For the maximum power point tracking of the photovoltaic system, P&O based algorithm has been implemented. The Pi controller for the CUK MPPT scheme shows a regulated output in variable load conditions. A classical H-bridge inverter topology with extra fifth switch has been used to connect the single phase grid. For the traditional grid connected PV inverter system, a transformer is utilized to provide the galvanic isolation between the grid and PV system. But Common mode leakage current increases due to the removal of the transformer from the system. Here, this transformer less H5 inverter is used for the proposed system which suppresses the common mode leakage current thereby improving the power conversion efficiency and decreases the grid current distortion. The removal of the transformer from the grid tied PV inverter system will give an improvement in the efficiency factor and reduces the cost of the system. The performance of the proposed system is tested in MATLAB/SIMULINK software and the simulation results are included for the effective demonstration of the converter and inverter efficiency. The results of the grid voltage and grid current have been analyzed and the total harmonic distortion of the PV inverter system has been verified.