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Analysis of Leakage Current in a Transformerless PV Inverter Connected to the Grid

Author

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  • R. C. Ujawanw
  • Pranjali Zele
  • Ajinkya Khadse
  • Kiran Dhabale

Abstract

Analysis of a leakage current in transformerless photovoltaic inverter (PV inverter) connected to the grid. In order to analyze the leakage current many inverter topologies have been proposed. In this paper examine the leakage current in a transformerless PV connected to the single phase grid system. For low power grid connected application a single phase converter can be used and it is possible to remove the transformer in the inverter in order to reduce losses, cost and size. Galvanic connection of the grid and the DC sources in transformerless system can introduce additional leakage current due to parasitic capacitance. This can also be prevented by using various topologies and pulse width modulation (PWM) techniques. Full bridge configuration with bipolar pulse width modulation has constant common mode voltage but with a reduced efficiency and large output current ripple. Full bridge with unipolar pulse width modulation has many advantages of increased efficiency and three level output to minimise the leakage current and improve the efficiency, the various topology for the transformerlessphotovoltaic applications and developed. In addition, the full-bridge inverter with bipolar, unipolar and hybrid modulation scheme is investigated.

Suggested Citation

  • R. C. Ujawanw & Pranjali Zele & Ajinkya Khadse & Kiran Dhabale, 2018. "Analysis of Leakage Current in a Transformerless PV Inverter Connected to the Grid," International Journal of Scientific Research in Science, Engineering and Technology, International Journal of Scientific Research in Science, Engineering and Technology, vol. 5(2), pages 48-55, March.
    • Handle: RePEc:ijs:ijsrse:v5:y2018:i2:id:hijsrset1852011
    Note: Article URL: https://ijsrset.com/IJSRSET1852011
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