Actually I am simulating a single phase transformerless grid connected PV inverter with unipolar modulation in MATLAB/Simulink. After simulating, I found that the CM voltage has a lot of high frequency components and it has a large leakage current. I am working on how to minimize this leakage current and minimize the high frequency components in CM voltage. Can we design a conventional LCL filter for this ? Or we have to go for an EMI filter design ?
Dear Siddharth:
You could benefit from this article:
"Leakage current minimization techniques for single-phase transformerless grid-connected PV inverters"
Publisher: IEEE
Abstract:
This paper presents an overview about techniques employed to minimize the leakage current in single-phase transformerless grid-connected PV inverters, using topologies derived from the full-bridge voltage source inverter (VSI). Some representative topologies and common mode (CM) filter implementations are presented. Among the analyzed solutions, a CM filter integrated to the harmonics filter, applied to a conventional full-bridge converter with unipolar output voltage, represents a promising solution, confirmed by simulation and experimental results. Additionally, discussions about safety standards and analysis of leakage current production mechanism are presented.
I wish it will be helpful....
Indeed you could benefit from this URL:
https://link.springer.com/article/10.1007/s40565-017-0367-z.
And the attached pdf ..
With my regards ...
Also, here are some articles about the same topic ...
https://worldwidescience.org/topicpages/t/transformerless+single-phase+grid-connected.html.
Yes, it can be used for this purpose. More information about EMI filter design can be found in the following books/papers:
1. V. Tarateeraseth, K. Y. See, F. G. Canavero, and R. W. Chang, "Systematic electromagnetic interference filter design based on information from in-circuit impedance measurements," IEEE Trans. Electromagn. Compat., vol. 52, no. 3, pp. 588-598, Aug. 2010.
2. M. J. Nave, Power Line Filter Design for Switched-Mode Power Supplies. New York: Van Nostrand Reinhold, 1991.
3. C. R. Paul, Introduction to Electromagnetic Compatibility. New York: Wiley, 1992.
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