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A Review of Power Decoupling Techniques for Microinverters With Three Different Decoupling Capacitor Locations in PV Systems

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5 Author(s)
Haibing Hu ; Jiangsu Key Lab. of New Energy Generation & Power Conversion, Nanjing Univ. of Aeronaut. & Astronaut., Nanjing, China ; Harb, S. ; Kutkut, N. ; Batarseh, I.
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The reliability of the microinverter is a very important feature that will determine the reliability of the ac-module photovoltaic (PV) system. Recently, many topologies and techniques have been proposed to improve its reliability. This paper presents a thorough study for different power decoupling techniques in single-phase microinverters for grid-tie PV applications. These power decoupling techniques are categorized into three groups in terms of the decoupling capacitor locations: 1) PV-side decoupling; 2) dc-link decoupling; and 3) ac-side decoupling. Various techniques and topologies are presented, compared, and scrutinized in scope of the size of decoupling capacitor, efficiency, and control complexity. Also, a systematic performance comparison is presented for potential power decoupling topologies and techniques.

Published in:

Power Electronics, IEEE Transactions on  (Volume:28 ,  Issue: 6 )