Comparison between unipolar and bipolar single phase grid-connected inverters for PV applications

Paper


Bowtell, Les and Ahfock, Tony. 2007. "Comparison between unipolar and bipolar single phase grid-connected inverters for PV applications." AUPEC 2007: 17th Australasian Universities Power Engineering Conference. Perth, Australia 09 - 12 Dec 2007 Australia. https://doi.org/10.1109/AUPEC.2007.4548098
Paper/Presentation Title

Comparison between unipolar and bipolar single phase grid-connected inverters for PV applications

Presentation TypePaper
AuthorsBowtell, Les (Author) and Ahfock, Tony (Author)
Journal or Proceedings TitleProceedings of the 17th Australasian Universities Power Engineering Conference (AUPEC 2007)
Number of Pages5
Year2007
Place of PublicationAustralia
ISBN9780646494883
Digital Object Identifier (DOI)https://doi.org/10.1109/AUPEC.2007.4548098
Web Address (URL) of Paperhttps://ieeexplore.ieee.org/document/4548098
Web Address (URL) of Conference Proceedingshttps://ieeexplore.ieee.org/xpl/conhome/4542677/proceeding
Conference/EventAUPEC 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.

Keywordsinverter switching; current controlled inverters
ANZSRC Field of Research 2020401703. Energy generation, conversion and storage (excl. chemical and electrical)
490406. Lie groups, harmonic and Fourier analysis
400801. Circuits and systems
Public Notes

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Byline AffiliationsDepartment of Electrical, Electronic and Computer Engineering
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Method and apparatus for measuring electrical conductivity
Hancock, Nigel Harold, Maxwell, Andrew Douglas and Ah Fock, Antonio Louis. 2005. Method and apparatus for measuring electrical conductivity. 2005205611
Power quality and efficiency improvements for transformerless grid connected PV inverters
Bowtell, Leslie. 2010. Power quality and efficiency improvements for transformerless grid connected PV inverters. PhD Thesis Doctor of Philosophy. University of Southern Queensland.
Method and apparatus for measuring electrical conductivity
Hancock, Nigel H., Maxwell, Andrew D. and Ahfock, Tony L.. 2008. Method and apparatus for measuring electrical conductivity. AG01N2702FI
Magnetic flux density distribution in axial flux machine cores
Hewitt, Andrew, Ahfock, Tony L. and Suslov, Sergey A.. 2005. "Magnetic flux density distribution in axial flux machine cores." IET Electric Power Applications. 152 (2), pp. 192-196. https://doi.org/10.1049/ip-epa:20055039
Effect of fat and muscle tissue conductivity on cortical currents - a tDCS study
Shahid, Salman, Wen, Peng and Ahfock, Tony. 2011. "Effect of fat and muscle tissue conductivity on cortical currents - a tDCS study." Guo, Shuxiang, Touge, Tetsuo and Xiufen, Ye (ed.) 2011 IEEE/ICME International Conference on Complex Medical Engineering (ICME 2011). Harbin, China 22 - 25 May 2011 Piscataway, NJ. United States. https://doi.org/10.1109/ICCME.2011.5876735
Remote access laboratories in Australia and Europe
Ku, H., Ahfock, T. and Yusaf, T.. 2011. "Remote access laboratories in Australia and Europe." European Journal of Engineering Education. 36 (3), pp. 253-268. https://doi.org/10.1080/03043797.2011.578244
Dynamic analysis of a DC offset controller for grid-connected inverters
Bowtell, L. A. and Ahfock, A. L.. 2010. "Dynamic analysis of a DC offset controller for grid-connected inverters." Duke, Richard (ed.) AUPEC 2010: Power Quality for the 21st Century. Christchurch, New Zealand 05 - 08 Dec 2010 United States.
Direct current offset controller for transformerless single-phase photovoltaic grid-connected inverters
Bowtell, L. and Ahfock, A.. 2010. "Direct current offset controller for transformerless single-phase photovoltaic grid-connected inverters." IET Renewable Power Generation. 4 (5), pp. 428-437. https://doi.org/10.1049/iet-rpg.2009.0043
The use of arc-suppression coils in power systems with open-delta regulators
Burgess, R. and Ahfock, A.. 2010. "The use of arc-suppression coils in power systems with open-delta regulators." Duke, Richard (ed.) AUPEC 2010: Power Quality for the 21st Century. Christchurch, New Zealand 05 - 08 Dec 2010 Christchurch, New Zealand.
Effects of head geometry and coil position on field distribution under transcranial magnetic stimulation
Shahid, Salman, Wen, Peng, Ahfock, Tony and Leis, John. 2011. "Effects of head geometry and coil position on field distribution under transcranial magnetic stimulation." MECBME 2011: Connecting Professionals in Biomedical Sciences and Technology. Sharjah, United Arab Emirates 21 - 24 Feb 2011 Red Hook, NY. United States. https://doi.org/10.1109/MECBME.2011.5752158
Distortion in single phase current controlled PV inverters for grid connection
Sharma, Ronald and Ahfock, Tony L.. 2004. "Distortion in single phase current controlled PV inverters for grid connection ." Saha, T. K. and Walker, G. R. (ed.) AUPEC 2004: Challenges and Opportunities in the Deregulated Power Industry. Brisbane, Australia 26 - 29 Sep 2004 Brisbane, Australia.
A practical demonstration of electromagnetic braking
Ahfock, T. and Wells, C. G.. 2007. "A practical demonstration of electromagnetic braking." AUPEC 2007: 17th Australasian Universities Power Engineering Conference. Perth, Australia 09 - 12 Dec 2007 Perth, Australia. https://doi.org/10.1109/AUPEC.2007.4548077
Designing printed circuit stators for brushless permanent magnet motors
Gambetta, D. and Ahfock, A.. 2009. "Designing printed circuit stators for brushless permanent magnet motors." IET Electric Power Applications. 3 (5), pp. 482-490. https://doi.org/10.1049/iet-epa.2008.0199
A new sensorless commutation technique for brushless DC motors
Gambetta, D. and Ahfock, A.. 2009. "A new sensorless commutation technique for brushless DC motors." IET Electric Power Applications. 3 (1), pp. 40-49. https://doi.org/10.1049/iet-epa:20070517
Sub-domain scaling for finite element analysis of electrical machines
Hewitt, Andrew and Ahfock, Tony L.. 2005. "Sub-domain scaling for finite element analysis of electrical machines." IET Electric Power Applications. 152 (2), pp. 149-156. https://doi.org/10.1049/ip-epa:20055078
Ultra-capacitor assisted battery storage for remote area power supplies: a case study
Helwig, Andreas and Ahfock, Tony L.. 2009. "Ultra-capacitor assisted battery storage for remote area power supplies: a case study." Ertugrul, Nesimi (ed.) AUPEC 2009: Sustainable Energy Technologies and Systems. Adelaide, Australia 27 - 30 Sep 2009 Adelaide, Australia.
Infrastructure for remotely accessible laboratories at the University of Southern Queensland
Ahfock, Tony, Buttsworth, David, Phythian, Mark and Maxwell, Andrew. 2008. "Infrastructure for remotely accessible laboratories at the University of Southern Queensland." Mann, Llewellyn, Thompson, Adam and Howard, Prue (ed.) 19th Annual Conference of the Australasian Association for Engineering Education (AAEE 2008). Yeppoon, Australia 07 - 10 Dec 2008 Canberra, Australia.
Internationalisation of Technology and Society course at University of Southern Queensland
Thorpe, David and Ahfock, Tony. 2005. "Internationalisation of Technology and Society course at University of Southern Queensland." Radcliffe, David and Humphries, Josh (ed.) 4th ASEE/AaeE Global Colloquium on Engineering Education. Sydney, Australia 26 - 29 Sep 2005 Brisbane, Australia.
DC magnetisation of transformers
Ahfock, A. and Hewitt, A. J.. 2006. "DC magnetisation of transformers." IET Electric Power Applications. 153 (4), pp. 601-607.
DC offset elimination in a single-phase grid-connected photovoltaic system
Ahfock, Tony L. and Bowtell, Leslie. 2006. "DC offset elimination in a single-phase grid-connected photovoltaic system." AUPEC 2006: 16th Australasian Universities Power Engineering Conference. Melbourne, Australia 10 - 13 Dec 2006 Melbourne, Australia.
Curvature-related eddy-current losses in laminated axial flux machine cores
Ahfock, Tony L. and Hewitt, Andrew. 2005. "Curvature-related eddy-current losses in laminated axial flux machine cores." IET Electric Power Applications. 152 (5), pp. 1350-1358. https://doi.org/10.1049/ip-erp:20045280
Modeling of the solid rotor induction motor
Ahfock, Tony L. and Hewitt, Andrew. 2005. "Modeling of the solid rotor induction motor." Negnevitsky, Michael (ed.) AUPEC 2005: 15th Australasian Universities Power Engineering Conference. Hobart, Australia 25 - 28 Sep 2005 Hobart, Australia.
A pulsed LED system for schlieren flow visualisation
Buttsworth, David R. and Ahfock, Tony L.. 2003. A pulsed LED system for schlieren flow visualisation. Toowoomba, Australia. University of Southern Queensland.