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Reduction of Leakage Current in Improved Transformerless CMI Based PV Systems


Affiliations
1 Karpagam Academy of Higher Education, Coimbatore, India
2 Department of EEE, Karpagam Academy of Higher Education, Coimbatore, India
 

The depletion of fossil fuel in the recent years results in increasing demand in power generation. so renewable energy sources are used to generate the power to decrease the power demand. In the different forms of renewable energy sources, PV system forms the reliable for power generation. Thus the transformerless CMI is considered to be the best possible combination with low cost and high efficiency photovoltaic systems. the leakage current is one of the most important issues for transformerless CMI based grid-connected photovoltaic system applications, where the technical challenge is to keep the system common-mode voltage as constant to reduce the leakage current. The result of leakage current resulted from the parasitic capacitance due to its efficiency and reliability is reduced. The leakage current formed due to the common mode and differential mode voltage is also analysed and reduced in this paper. So the problem due to transformerless PV inverter should be tackled carefully. In this paper the basic H -bridge and QZSI network are employed, because it offers low impedance to high frequency harmonics. The filter based suppression solution is used to reduce the leakage current. Thus analysis and solution for reduced leakage current and harmonic reduction is done and verified using simulation tool MATLAB and result is obtained.

Keywords

[PV]- Photovoltaic, [CMI] –Cascaded Multilevel Inverter, [THD]-Total Harmonic Distortion, [Qzsi]-Quasi z Source Iinverter, [CM]-Common Mode, [DM]-Differential Mode, [CCM] – CM Capacitor, [Cpv] – PV Parasitic Capacitor.
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  • Reduction of Leakage Current in Improved Transformerless CMI Based PV Systems

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Authors

M. Sasikala
Karpagam Academy of Higher Education, Coimbatore, India
S. Kuppusamy
Department of EEE, Karpagam Academy of Higher Education, Coimbatore, India

Abstract


The depletion of fossil fuel in the recent years results in increasing demand in power generation. so renewable energy sources are used to generate the power to decrease the power demand. In the different forms of renewable energy sources, PV system forms the reliable for power generation. Thus the transformerless CMI is considered to be the best possible combination with low cost and high efficiency photovoltaic systems. the leakage current is one of the most important issues for transformerless CMI based grid-connected photovoltaic system applications, where the technical challenge is to keep the system common-mode voltage as constant to reduce the leakage current. The result of leakage current resulted from the parasitic capacitance due to its efficiency and reliability is reduced. The leakage current formed due to the common mode and differential mode voltage is also analysed and reduced in this paper. So the problem due to transformerless PV inverter should be tackled carefully. In this paper the basic H -bridge and QZSI network are employed, because it offers low impedance to high frequency harmonics. The filter based suppression solution is used to reduce the leakage current. Thus analysis and solution for reduced leakage current and harmonic reduction is done and verified using simulation tool MATLAB and result is obtained.

Keywords


[PV]- Photovoltaic, [CMI] –Cascaded Multilevel Inverter, [THD]-Total Harmonic Distortion, [Qzsi]-Quasi z Source Iinverter, [CM]-Common Mode, [DM]-Differential Mode, [CCM] – CM Capacitor, [Cpv] – PV Parasitic Capacitor.