Dynamic analysis of a DC offset controller for grid-connected inverters

Paper

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.
Paper/Presentation Title

Dynamic analysis of a DC offset controller for grid-connected inverters

Presentation TypePaper
AuthorsBowtell, L. A. (Author) and Ahfock, A. L. (Author)
EditorsDuke, Richard
Journal or Proceedings TitleProceedings of the 20th Australasian Universities Power Engineering Conference (AUPEC 2010)
ERA Conference ID50279
Number of Pages5
Year2010
Place of PublicationUnited States
ISBN9780473182366
Web Address (URL) of Paperhttps://ieeexplore.ieee.org/document/5710808
Conference/EventAUPEC 2010: Power Quality for the 21st Century
Australasian Universities Power Engineering Conference
Event Details
AUPEC 2010: Power Quality for the 21st Century
Event Date
05 to end of 08 Dec 2010
Event Location
Christchurch, New Zealand
Event Details
Australasian Universities Power Engineering Conference
AUPEC
Abstract

DC injection limits into the AC network are an important power quality control requirement for gridconnected photovoltaic systems. Most publications on DC offset controllers focus only on their steady state performance. It is important to consider their dynamic performance especially in terms of speed of response and stability. In this paper a mathematical model for a digitally implemented DC offset controller is derived. A design procedure, based on the model, is proposed for the controller. Results of tests performed on a system of 1kW nominal rating, provide validation for the mathematical model.

Keywordsdynamic dc-offset control; digital dc-offset control; AC networks; DC injection; DC offsets; design procedure; dynamic performance; grid connected inverters; grid-connected photovoltaic system; speed of response; steady state performance
ANZSRC Field of Research 2020401703. Energy generation, conversion and storage (excl. chemical and electrical)
400999. Electronics, sensors and digital hardware not elsewhere classified
400803. Electrical energy generation (incl. renewables, excl. photovoltaics)
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Byline AffiliationsDepartment of Electrical, Electronic and Computer Engineering
Institution of OriginUniversity of Southern Queensland
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Helwig, A. and Ahfock, A.. 2011. "Sizing nickel iron batteries for RAPS systems." 2011 IET Renewable Power Generation Conference (RPG 2011) . Edinburgh, United Kingdom 06 - 08 Sep 2011 Stevenage, Herts. United Kingdom. https://doi.org/10.1049/cp.2011.0148
Flexible engineering degree programs with remote access laboratories in an Australian regional university known for its excellence in e-learning
Ku, H., Goh, S. and Ahfock, A.. 2011. "Flexible engineering degree programs with remote access laboratories in an Australian regional university known for its excellence in e-learning." Computer Applications in Engineering Education. 19 (1), pp. 18-25. https://doi.org/10.1002/cae.20284
Stator eddy-current losses in printed circuit brushless motors
Ahfock, A. and Gambetta, D.. 2011. "Stator eddy-current losses in printed circuit brushless motors." IET Electric Power Applications. 5 (1), pp. 159-167. https://doi.org/10.1049/iet-epa.2009.0203
Minimising the risk of cross-country faults in systems using arc suppression coils
Burgess, R. and Ahfock, A.. 2011. "Minimising the risk of cross-country faults in systems using arc suppression coils." IET Generation, Transmission and Distribution. 5 (7), pp. 703-711. https://doi.org/10.1049/iet-gtd.2010.0351
Sensorless commutation of printed circuit brushless direct current motors
Ahfock, A. and Gambetta, D.. 2010. "Sensorless commutation of printed circuit brushless direct current motors ." IET Electric Power Applications. 4 (6), pp. 397-406. https://doi.org/10.1049/iet-epa.2009.0133
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
Comparison between unipolar and bipolar single phase grid-connected inverters for PV applications
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
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
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.