Comparison between unipolar and bipolar single phase grid-connected inverters for PV applications
Paper
Paper/Presentation Title | Comparison between unipolar and bipolar single phase grid-connected inverters for PV applications |
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Presentation Type | Paper |
Authors | Bowtell, Les (Author) and Ahfock, Tony (Author) |
Journal or Proceedings Title | Proceedings of the 17th Australasian Universities Power Engineering Conference (AUPEC 2007) |
Number of Pages | 5 |
Year | 2007 |
Place of Publication | Australia |
ISBN | 9780646494883 |
Digital Object Identifier (DOI) | https://doi.org/10.1109/AUPEC.2007.4548098 |
Web Address (URL) of Paper | https://ieeexplore.ieee.org/document/4548098 |
Web Address (URL) of Conference Proceedings | https://ieeexplore.ieee.org/xpl/conhome/4542677/proceeding |
Conference/Event | AUPEC 2007: 17th Australasian Universities Power Engineering Conference |
Event Details | AUPEC 2007: 17th Australasian Universities Power Engineering Conference Event Date 09 to end of 12 Dec 2007 Event Location Perth, Australia |
Abstract | An inverter is essential for the interfacing of photovoltaic panels with the AC network. There are many possible inverter topologies and inverter switching schemes and each one will have its own relative advantages and disadvantages. Efficiency and output current distortion are two important factors governing the choice of inverter system. In this paper, it is argued that current controlled inverters offer significant advantages from the point of view of minimisation of current distortion. Two inverter switching strategies are explored in detail. These are the unipolar current controlled inverter and the bipolar current controlled inverter. With respect to low frequency distortion, previously published works provide theoretical arguments in favour of bipolar switching. On the other hand it has also been argued that the unipolar switched inverter offers reduced switching losses and generates less EMI. On efficiency grounds, it appears that the unipolar switched inverter has an advantage. However, experimental results presented in this paper show that the level of low frequency current distortion in the unipolar switched inverter is such that it can only comply with Australian Standard 4777.2 above a minimum output current. On the other hand it is shown that at the same current levels bipolar switching results in reduced low frequency harmonics. |
Keywords | inverter switching; current controlled inverters |
ANZSRC Field of Research 2020 | 401703. Energy generation, conversion and storage (excl. chemical and electrical) |
490406. Lie groups, harmonic and Fourier analysis | |
400801. Circuits and systems | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | Department of Electrical, Electronic and Computer Engineering |
https://research.usq.edu.au/item/9yvy4/comparison-between-unipolar-and-bipolar-single-phase-grid-connected-inverters-for-pv-applications
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