# Direct current offset controller for transformerless single-phase photovoltaic grid-connected inverters

Article

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
Article Title Direct current offset controller for transformerless single-phase photovoltaic grid-connected inverters 40937 Article Bowtell, L. (Author) and Ahfock, A. (Author) IET Renewable Power Generation 4 (5), pp. 428-437 10 2010 Stevenage, Herts. United Kingdom 1752-1416 1752-1424 https://doi.org/10.1049/iet-rpg.2009.0043 https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2009.0043 Limitation of direct current (DC) injection into the alternating current (AC) network is an important operational requirement for grid-connected photovoltaic (PV) systems. One way to ensure that this requirement is met is to use a power transformer as interface to the AC network. But this adds costs, mass, volume and power losses. In a transformerless system, the inverter forming part of the PV system has to be operated so that the DC content in its output current is below the specified limits. Ideally, there should be no DC at the output of the inverter, but in practice, in the absence of special measures, a small amount of DC current is present. A technique for elimination of the DC-offset is proposed. It is based on the sensing of the DC-offset voltage at the output of the inverter. A sensor output is used to drive a feedback system designed to control the operation of the inverter so that the DC-offset is forced to stay within the acceptable limits. A mathematical model for the DC-offset controller is derived. A design procedure, based on the model, is proposed for the controller. The results of tests performed on a system of 1 kW nominal rating provide validation for the mathematical model. DC-offset; power quality; DC-injection; AC networks; acceptable limit; alternating current; AS interfaces; DC current; DC offsets; design procedure; direct current; direct-current offsets; feedback systems; grid connected inverters; grid-connected photovoltaic system; operational requirements; output current; power-losses; PV system; sensor output; transformerless 400803. Electrical energy generation (incl. renewables, excl. photovoltaics) 490105. Dynamical systems in applications 401706. Numerical modelling and mechanical characterisation File reproduced in accordance with the copyright policy of the publisher/author. Department of Electrical, Electronic and Computer Engineering University of Southern Queensland

https://research.usq.edu.au/item/q07vq/direct-current-offset-controller-for-transformerless-single-phase-photovoltaic-grid-connected-inverters

###### Accepted Version
 Bowtell_Ahfock_IRPG_2010_AV.pdf File access level: Anyone

total views
• ##### 1
views this month

## Related outputs

##### CFDs Modeling and Simulation of Wheat Straw Pellet Combustion in a 10 kW Fixed-Bed Downdraft Reactor
Nath, Bidhan, Chen, Guangnan, Bowtell, Les and Mahmood, Raid Ahmed. 2024. "CFDs Modeling and Simulation of Wheat Straw Pellet Combustion in a 10 kW Fixed-Bed Downdraft Reactor." Processes. 12 (5). https://doi.org/10.3390/pr12050863
##### An investigation of thermal decomposition behavior and combustion parameter of pellets from wheat straw and additive blends by thermogravimetric analysis
Nath, Bidhan, Chen, Guangnan, Bowtell, Les and Graham, Elizabeth. 2024. "An investigation of thermal decomposition behavior and combustion parameter of pellets from wheat straw and additive blends by thermogravimetric analysis." International Journal of Thermofluids. 22. https://doi.org/10.1016/j.ijft.2024.100660
##### Pyrolysis of wheat straw pellets in a pilot-scale reactor: Effect of temperature and residence time
Nath, Bidhan, Chen, Guangnan, Bowtell, Les and Nguyen-Huy, Thong. 2024. "Pyrolysis of wheat straw pellets in a pilot-scale reactor: Effect of temperature and residence time." Energy Science and Engineering. 12 (8), pp. 3524-3539. https://doi.org/10.1002/ese3.1833
##### Kinetic mechanism of wheat straw pellets combustion process with a thermogravimetric analyser
Nath, Bidhan, Chen, Guangnan, Bowtell, Les and Graham, Elizabeth. 2023. "Kinetic mechanism of wheat straw pellets combustion process with a thermogravimetric analyser." Heliyon. 9 (10). https://doi.org/10.1016/j.heliyon.2023.e20602
##### An integrated decision-making approach for managing transformer tap changer operation while optimizing renewable energy storage allocation using ANP-entropy and TOPSIS
Haidar, Ahmed M. A., Sharip, Mohd R. M. and Ahfock, Tony. 2023. "An integrated decision-making approach for managing transformer tap changer operation while optimizing renewable energy storage allocation using ANP-entropy and TOPSIS." Electrical Engineering: Archiv fuer elektrotechnik. 106 (3), pp. 2407-2423. https://doi.org/10.1007/s00202-023-02057-1
##### Investigation of Gas Release from Recycled Plastic Shopping Bags during Melting at Low Temperatures
Eberhard, Susette, Bowtell, Les, Lenske, Brian and Islam, Mainul. 2023. "Investigation of Gas Release from Recycled Plastic Shopping Bags during Melting at Low Temperatures." Advances in Materials Science and Engineering. 2023, pp. 1-9. https://doi.org/10.1155/2023/2378231
##### Assessment of Densified Fuel Quality Parameters: A Case Study for Wheat Straw Pellet
Nath, Bidhan, Chen, Guangnan, Bowtell, Les and Mahmood, Raid Ahmed. 2023. "Assessment of Densified Fuel Quality Parameters: A Case Study for Wheat Straw Pellet." Journal of Bioresources and Bioproducts. 8 (1), pp. 45-58. https://doi.org/10.1016/j.jobab.2022.10.001
##### Grid frequency support from inverter connected generation
Mlilo, Njabulo, Ahfock, Tony and Brown, Jason. 2021. "Grid frequency support from inverter connected generation." 31st Australasian Universities Power Engineering Conference (AUPEC 2021). Perth, Australia 26 - 30 Sep 2021 United States. https://doi.org/10.1109/AUPEC52110.2021.9597782
##### Impact of intermittent renewable energy generation penetration on the power system networks – A review
Mlilo, Njabulo, Brown, Jason and Ahfock, Tony. 2021. "Impact of intermittent renewable energy generation penetration on the power system networks – A review." Technology and Economics of Smart Grids and Sustainable Energy. 6 (1), pp. 1-19. https://doi.org/10.1007/s40866-021-00123-w
##### Addition of Activated Carbon into a Cattle Diet to Mitigate GHG Emissions and Improve Production
Al-Azzawi, Mohammed, Bowtell, Les, Hancock, Kerry and Preston, Sarah. 2021. "Addition of Activated Carbon into a Cattle Diet to Mitigate GHG Emissions and Improve Production." Sustainability. 13 (15), pp. 1-17. https://doi.org/10.3390/su13158254
##### Feasibility Analysis of Implementing Hybrid Powered Electric Vehicle Charging Stations in Sarawak
Haidar, Ahmed M. A., Ahfock, Tony and Han, Lim Wei. 2022. "Feasibility Analysis of Implementing Hybrid Powered Electric Vehicle Charging Stations in Sarawak." 2022 IEEE Sustainable Power and Energy Conference (iSPEC). Perth, Australia 04 - 07 Dec 2022 Australia. IEEE (Institute of Electrical and Electronics Engineers). https://doi.org/10.1109/iSPEC54162.2022.10032990
##### Innovative capacitive deionization-degaussing approach for improving adsorption/desorption for macadamia nutshell biochar
Al-juboori, Raed A., Bakly, Salam, Bowtell, Les, Alkurdi, Susan S.A. and Altaee, Ali. 2022. "Innovative capacitive deionization-degaussing approach for improving adsorption/desorption for macadamia nutshell biochar." Journal of Water Process Engineering. 47. https://doi.org/10.1016/j.jwpe.2022.102786
##### A preliminary study of the impact of lateral head orientations on the current distributions during tDCS
Song, Bo, Menezes de Oliveira, Marilia, Wang, Shuaifang, Li, Yan, Wen, Peng and Ahfock, Tony. 2019. "A preliminary study of the impact of lateral head orientations on the current distributions during tDCS." Liang, Peipeng, Goel, Vinod and Shan, Chunlei (ed.) 12th International Conference on Brain Informatics (BI 2019). Haikou, China 13 - 15 Dec 2019 Cham, Switzerland. https://doi.org/10.1007/978-3-030-37078-7_25
##### Power effect of ultrasonically vibrated spacers in air gap membrane distillation: Theoretical and experimental investigations
Al-Juboori, Raed A., Naji, Osamah, Bowtell, Les, Alpatova, Alla, Soukane, Sofiane and Ghaffour, Norreddine. 2021. "Power effect of ultrasonically vibrated spacers in air gap membrane distillation: Theoretical and experimental investigations." Separation and Purification Technology. 262, pp. 1-12. https://doi.org/10.1016/j.seppur.2021.118319
##### Inorganic arsenic species removal from water using bone char: A detailed study on adsorption kinetic and isotherm models using error functions analysis
Alkurdi, Susan S. A., Al-juboori, Raed A., Bundschuh, Jochen, Bowtell, Les and Marchuk, Alla. 2021. "Inorganic arsenic species removal from water using bone char: A detailed study on adsorption kinetic and isotherm models using error functions analysis." Journal of Hazardous Materials. 405. https://doi.org/10.1016/j.jhazmat.2020.124112
##### Biochar effects on nutrients retention and release of hydroponics growth media
Haraz, Mohammed Taha, Bowtell, Les and Al-Juboori, Raed. 2020. "Biochar effects on nutrients retention and release of hydroponics growth media." Journal of Agricultural Science. 12 (7). https://doi.org/10.5539/jas.v12n8p1
##### A review of measuring, assessing and mitigating heat stress in dairy cattle
Ji, Boyu, Banhazi, Thomas, Perano, Kristen, Ghahramani, Afshin, Bowtell, Les, Wang, Chaoyuan and Li, Baoming. 2020. "A review of measuring, assessing and mitigating heat stress in dairy cattle." Biosystems Engineering. 199, pp. 4-26. https://doi.org/10.1016/j.biosystemseng.2020.07.009
##### Modelling of heat stress in a robotic dairy farm. Part 4: Time constant and cumulative effects of heat stress
Ji, Boyu, Banhazi, Thomas, Ghahramani, Afshin, Bowtell, Les, Wang, Chaoyuan and Li, Baoming. 2020. "Modelling of heat stress in a robotic dairy farm. Part 4: Time constant and cumulative effects of heat stress." Biosystems Engineering. 199, pp. 73-82. https://doi.org/10.1016/j.biosystemseng.2020.07.014
##### The current state of Distributed Renewable Generation, challenges of interconnection and opportunities for energy conversion based DC microgrids
Ullah, Shahid, Haidar, Ahmed M. A., Hoole, Paul, Zen, Hushairi and Ahfock, Tony. 2020. "The current state of Distributed Renewable Generation, challenges of interconnection and opportunities for energy conversion based DC microgrids." Journal of Cleaner Production. 273, pp. 1-23. https://doi.org/10.1016/j.jclepro.2020.122777
##### Human Head Modelling Simulation Applied to Electroconvulsive Therapy
Menezes de Oliveira, Marilia, Song, Bo, Ahfock, Tony, Li, Yan and Wen, Paul. 2018. "Human Head Modelling Simulation Applied to Electroconvulsive Therapy." Abreu de Souza, Mauren, Remigio Gamba, Humberto and Pedrini, Helio (ed.) Multi-Modality Imaging: Applications and Computational Techniques. Cham, Switzerland. Springer. pp. 103-133
##### Effect of pyrolysis conditions on bone char characterization and its ability for arsenic and fluoride removal
Alkurdi, Susan S. A., Al-juboori, Raed A., Bundschuh, Jochen, Bowtell, Les and McKnight, Stafford. 2020. "Effect of pyrolysis conditions on bone char characterization and its ability for arsenic and fluoride removal ." Environmental Pollution. 262. https://doi.org/10.1016/j.envpol.2020.114221
##### Modelling of heat stress in a robotic dairy farm. Part 3: rumination and milking performance
Ji, Boyu, Banhazi, Thomas, Ghahramani, Afshin, Bowtell, Les, Wang, Chaoyuan and Li, Baoming. 2020. "Modelling of heat stress in a robotic dairy farm. Part 3: rumination and milking performance." Biosystems Engineering. 199, pp. 58-72. https://doi.org/10.1016/j.biosystemseng.2020.02.006
##### Direct contact ultrasound for fouling control and flux enhancement in air-gap membrane distillation
Naji, Osamah, Al-juboori, Raed, Bowtell, Les, Alpatova, Alla and Ghaffour, Noreddine. 2020. "Direct contact ultrasound for fouling control and flux enhancement in air-gap membrane distillation." Ultrasonics Sonochemistry. 61, pp. 1-12. https://doi.org/10.1016/j.ultsonch.2019.104816
##### A distributed secondary control strategy for power sharing and voltage regulation by multiple converters in DC micro-grids
Ullah, Shahid, Haidar, Ahmed M. A., Muttaqi, Kashem M. and Ahfock, Tony. 2019. "A distributed secondary control strategy for power sharing and voltage regulation by multiple converters in DC micro-grids." 2019 IEEE International Conference on Electrical, Control and Instrumentation Engineering (ICECIE 2019). Kuala Lumpur, Malaysia 25 Nov 2019 United States. https://doi.org/10.1109/ICECIE47765.2019.8974711
##### Daniell cell investigation for energy storage
Parikipandla, Bharath, Helwig, Andreas, Byrne, Terry, Holmes, Graham and Ahfock, Tony. 2018. "Daniell cell investigation for energy storage." 2017 Australasian Universities Power Engineering Conference (AUPEC 2017) . Melbourne, Australia 19 - 22 Nov 2017 New York, United States. https://doi.org/10.1109/AUPEC.2017.8282396
##### Modeling of multi-junction solar cells for maximum power point tracking to improve the conversion efficiency
Wang, Zhe, Das, Narottam, Helwig, Andreas and Ahfock, Tony. 2018. "Modeling of multi-junction solar cells for maximum power point tracking to improve the conversion efficiency." 2017 Australasian Universities Power Engineering Conference (AUPEC 2017) . Melbourne, Australia 19 - 22 Nov 2017 New York, United States. https://doi.org/10.1109/AUPEC.2017.8282402
##### Impact of incident light angle on the conversion efficiency of nano-structured GaAs solar cells
Sharma, Manish, Das, Narottam, Helwig, Andreas and Ahfock, Tony. 2018. "Impact of incident light angle on the conversion efficiency of nano-structured GaAs solar cells ." 2017 Australasian Universities Power Engineering Conference (AUPEC 2017) . Melbourne, Australia 19 - 22 Nov 2017 New York, United States. https://doi.org/10.1109/AUPEC.2017.8282411
##### Axial flux PM coreless stator machine development for low speed wind generator
Kaliyev, Vladislav, Helwig, Andreas and Ahfock, Tony. 2018. "Axial flux PM coreless stator machine development for low speed wind generator." 2017 Australasian Universities Power Engineering Conference (AUPEC 2017) . Melbourne, Australia 19 - 22 Nov 2017 United States. https://doi.org/10.1109/AUPEC.2017.8282397
##### Modelling of heat stress in a robotic dairy farm. Part 2: identifying the specific thresholds with production factors
Ji, Boyu, Banhazi, Thomas, Ghahramani, Afshin, Bowtell, Les, Wang, Chaoyuan and Li, Baoming. 2020. "Modelling of heat stress in a robotic dairy farm. Part 2: identifying the specific thresholds with production factors." Biosystems Engineering. 199, pp. 43-57. https://doi.org/10.1016/j.biosystemseng.2019.11.005
##### Modelling of heat stress in a robotic dairy farm. Part 1: thermal comfort indices as the indicators of production loss
Ji, Boyu, Banhazi, Thomas, Ghahramani, Afshin, Bowtell, Les, Wang, Chaoyuan and Li, Baoming. 2020. "Modelling of heat stress in a robotic dairy farm. Part 1: thermal comfort indices as the indicators of production loss." Biosystems Engineering. 199, pp. 27-42. https://doi.org/10.1016/j.biosystemseng.2019.11.004
##### An Investigation into Wooden Pole Fire Inception Threshold in a Single Wire Earth Return System under Drought Conditions
Catriz, Roderick, Ahfock, Tonuy and Worden, John. 2020. "An Investigation into Wooden Pole Fire Inception Threshold in a Single Wire Earth Return System under Drought Conditions ." 29th Australasian Universities Power Engineering Conference (AUPEC 2019). Nadi, Fiji 26 - 29 Nov 2019 United States. https://doi.org/10.1109/AUPEC48547.2019.211914
##### Macadamia Nutshell Biochar for Nitrate Removal: Effect of Biochar Preparation and Process Parameters
Bakly, Salam, Al-juboori, Raed A. and Bowtell, Les. 2019. "Macadamia Nutshell Biochar for Nitrate Removal: Effect of Biochar Preparation and Process Parameters ." C: journal of carbon research. 5 (3). https://doi.org/10.3390/c5030047
##### Pulsed ultrasound as an energy saving mode for ultrasound treatment of surface water with terrestrial aquatic carbon
Al-juboori, Raed A., Yusaf, Talal and Bowtell, Les. 2018. "Pulsed ultrasound as an energy saving mode for ultrasound treatment of surface water with terrestrial aquatic carbon." Desalination and Water Treatment. 135, pp. 167-176. https://doi.org/10.5004/dwt.2018.23173
##### Effect of air gap membrane distillation parameters on the removal of fluoride from synthetic water
Naji, Osamah, Bowtell, Les, Al-juboori, Raed A., Aravinthan, Vasantha and Ghaffour, Noreddine. 2018. "Effect of air gap membrane distillation parameters on the removal of fluoride from synthetic water." Desalination and Water Treatment. 124, pp. 11-20. https://doi.org/10.5004/dwt.2018.22694
##### Face-to-face instruction combined with online resources improves retention of clinical skills among undergraduate nursing students
Terry, Victoria R., Terry, Peter C., Moloney, Clint and Bowtell, Les. 2018. "Face-to-face instruction combined with online resources improves retention of clinical skills among undergraduate nursing students." Nurse Education Today. 61, pp. 15-19. https://doi.org/10.1016/j.nedt.2017.10.014
##### Investigation of ethanol production potential from lignocellulosic material without enzymatic hydrolysis using the ultrasound technique
Kandasamy, Manoj, Hamawand, Ihsan, Bowtell, Leslie, Seneweera, Saman, Chakrabarty, Sayan, Yusaf, Talal, Shakoor, Zaidoon, Algayyim, Sattar and Eberhard, Friederike. 2017. "Investigation of ethanol production potential from lignocellulosic material without enzymatic hydrolysis using the ultrasound technique." Energies. 10 (1), pp. 62-73. https://doi.org/10.3390/en10010062
##### Gasification of non-woody biomass: a literature review
Widjaya, Elita R., Chen, Guangnan, Bowtell, Les and Hills, Catherine. 2018. "Gasification of non-woody biomass: a literature review." Renewable and Sustainable Energy Reviews. 89, pp. 184-193. https://doi.org/10.1016/j.rser.2018.03.023
##### Commercialisation of conductivity-based acidity measurement systems for dairy applications
Hancock, Nigel, Maxwell, Andrew and Ahfock, Tony. 2008. Commercialisation of conductivity-based acidity measurement systems for dairy applications. Toowoomba. University of Southern Queensland.
##### Acidity measurement systems for dairy applications
Hancock, Nigel, Maxwell, Andrew and Ahfock, Tony. 2005. Acidity measurement systems for dairy applications . USQ - Toowoomba. University of Southern Queensland / Dairy Australia.
##### Heat transfer due to electroconvulsive therapy: influence of anisotropic thermal and electrical skull conductivity
Menezes de Oliveira, Marilia, Wen, Peng and Ahfock, Tony. 2016. "Heat transfer due to electroconvulsive therapy: influence of anisotropic thermal and electrical skull conductivity." Computer Methods and Programs in Biomedicine. 133, pp. 71-81. https://doi.org/10.1016/j.cmpb.2016.05.022
##### Numeric investigation of brain tumor influence on the current distributions during transcranial direct current stimulation
Song, Bo, Wen, Peng, Ahfock, Tony and Li, Yan. 2016. "Numeric investigation of brain tumor influence on the current distributions during transcranial direct current stimulation." IEEE Transactions on Biomedical Engineering. 63 (1), pp. 176-187. https://doi.org/10.1109/TBME.2015.2468672
##### Single Wire Earth Return (SWER) system voltage support using four quadrant DSTATCOM
Mirazimiabarghouei, Seyed Javad, Ahfock, Tony and Helwig, Andreas. 2016. "Single Wire Earth Return (SWER) system voltage support using four quadrant DSTATCOM." 6th IEEE International Conference on Power and Energy (PECon 2016): Empowering Technologies for Future Energy Sustainability. Melaka, Malaysia 28 - 29 Nov 2016 Malaysia. https://doi.org/10.1109/PECON.2016.7951564
##### Placement of Distribution STATic COMpensator (DSTATCOM) as voltage support equipment in Single Wire Earth Return (SWER) system
Mirazimiabarghouei, Seyed Javad, Ahfock, Tony and Helwig, Andreas. 2016. "Placement of Distribution STATic COMpensator (DSTATCOM) as voltage support equipment in Single Wire Earth Return (SWER) system." 6th IEEE International Conference on Power and Energy (PECon 2016): Empowering Technologies for Future Energy Sustainability. Melaka, Malaysia 28 - 29 Nov 2016 https://doi.org/10.1109/PECON.2016.7951468
##### Effects of head geometry, coil position and CSF displacement on field distribution under transcranial magnetic stimulation
Shahid, Salman, Wen, Peng, Ahfock, Tony and Leis, John. 2011. "Effects of head geometry, coil position and CSF displacement on field distribution under transcranial magnetic stimulation." Journal of Medical Imaging and Health Informatics. 1 (3), pp. 271-277. https://doi.org/10.1166/jmihi.2011.1040
##### Energy conversion efficiency of pulsed ultrasound
Al-Juboori, Raed A., Yusaf, Talal and Bowtell, Leslie. 2015. "Energy conversion efficiency of pulsed ultrasound." The 7th International Conference on Applied Energy - ICAE2015. Abu Dhabi, United Arab Emirates 28 - 31 Mar 2015 Netherlands. Elsevier. https://doi.org/10.1016/j.egypro.2015.07.340
##### The use of voltage regulators in power systems with arc-suppression coils
Burgess, R. and Ahfock, A.. 2011. "The use of voltage regulators in power systems with arc-suppression coils." AUPEC 2011: Integrating Renewables into the Grid. Brisbane, Australia 25 - 28 Sep 2011 Piscataway, NJ. United States.
##### Investigating natural organic carbon removal and structural alteration induced by pulsed ultrasound
Al-Juboori, Raed A., Yusaf, Talal, Aravinthan, Vasantha and Bowtell, Leslie. 2016. "Investigating natural organic carbon removal and structural alteration induced by pulsed ultrasound." Science of the Total Environment. 541, pp. 1019-1030. https://doi.org/10.1016/j.scitotenv.2015.09.143
##### Insights into the scalability of magnetostrictive ultrasound technology for water treatment applications
Al-Juboori, Raed A., Bowtell, Leslie A., Yusaf, Talal and Aravinthan, Vasantha. 2016. "Insights into the scalability of magnetostrictive ultrasound technology for water treatment applications." Ultrasonics Sonochemistry. 28, pp. 357-366. https://doi.org/10.1016/j.ultsonch.2015.08.013
##### Online intravenous pump emulator: as effective as face-to-face simulation for training nursing students
Terry, Victoria R., Moloney, Clint, Bowtell, Leslie and Terry, Peter C.. 2016. "Online intravenous pump emulator: as effective as face-to-face simulation for training nursing students." Nurse Education Today. 40, pp. 198-203. https://doi.org/10.1016/j.nedt.2016.03.004
##### Energy management and automated analytics for reduction of energy consumption
Santarossa, Matthew, Das, Narottam, Helwig, Andreas and Ahfock, Tony. 2016. "Energy management and automated analytics for reduction of energy consumption." Saha, Tapan (ed.) 26th Australasian Universities Power Engineering Conference (AUPEC 2016). Brisbane, Australia 25 - 28 Sep 2016 Brisbane, Australia. https://doi.org/10.1109/AUPEC.2016.7749315
##### A case study: is energy storage affordable for further Australian sustainable energy development?
Helwig, Andreas and Ahfock, Tony. 2015. "A case study: is energy storage affordable for further Australian sustainable energy development?" 25th Australasian Universities Power Engineering Conference 2015: Challenges for Future Grids (AUPEC 2015). Wollongong, Australia 27 - 30 Sep 2015 Wollongong, NSW, Australia. https://doi.org/10.1109/AUPEC.2015.7324821
##### Tracking ultrasonically structural changes of natural aquatic organic carbon: chemical fractionation and spectroscopic approaches
Al-Juboori, Raed A., Yusaf, Talal, Aravinthan, Vasantha and Bowtell, Leslie. 2016. "Tracking ultrasonically structural changes of natural aquatic organic carbon: chemical fractionation and spectroscopic approaches." Chemosphere. 145, pp. 231-248. https://doi.org/10.1016/j.chemosphere.2015.11.079
##### Assessing the application and downstream effects of pulsed mode ultrasound as a pre-treatment for alum coagulation
Al-Juboori, Raed A., Aravinthan, Vasantha, Yusaf, Talal and Bowtell, Leslie. 2016. "Assessing the application and downstream effects of pulsed mode ultrasound as a pre-treatment for alum coagulation." Ultrasonics Sonochemistry. 31, pp. 7-19. https://doi.org/10.1016/j.ultsonch.2015.11.028
##### A preliminary assessment of cotton gin waste-mixture co-gasification performance
Widjaya, Elita R., Chen, Guangnan, Bowtell, Leslie and Hills, Catherine. 2015. "A preliminary assessment of cotton gin waste-mixture co-gasification performance." 2nd International Conference on Agriculture, Environment and Biological Sciences (ICAEBS'15). Bali, Indonesia 16 - 17 Aug 2015
##### Investigating the feasibility and the optimal location of pulsed ultrasound in surface water treatment schemes
Al-Juboori, Raed A., Yusaf, Talal, Aravinthan, Vasantha, Pittaway, Pamela A. and Bowtell, Leslie. 2016. "Investigating the feasibility and the optimal location of pulsed ultrasound in surface water treatment schemes." Desalination and Water Treatment. 57 (11), pp. 4769-4787. https://doi.org/10.1080/19443994.2014.996771
##### Energy characterisation of ultrasonic systems for industrial processes
Al-Juboori, Raed A., Yusaf, Talal, Bowtell, Leslie and Aravinthan, Vasantha. 2015. "Energy characterisation of ultrasonic systems for industrial processes." Ultrasonics. 57, pp. 18-30. https://doi.org/10.1016/j.ultras.2014.10.003
##### A preliminary study about the distribution of temperature due to electrical stimulation in ECT
Menezes de Oliveira, Marilia, Wen, Peng, Ahfock, Tony and Shahid, Syed Salman. 2014. "A preliminary study about the distribution of temperature due to electrical stimulation in ECT." 2014 ICME International Conference on Complex Medical Engineering (ICME 2014). Taipei, Taiwan 26 - 29 Jun 2014 Piscataway, NJ. United States.
##### The value and cost of complexity in predictive modelling: role of tissue anisotropic conductivity and fibre tracts in neuromodulation
Shahid, Syed Salman, Bikson, Marom, Salman, Humaira, Wen, Peng and Ahfock, Tony. 2014. "The value and cost of complexity in predictive modelling: role of tissue anisotropic conductivity and fibre tracts in neuromodulation." Journal of Neural Engineering. 11 (3), pp. 1-19. https://doi.org/10.1088/1741-2560/11/3/036002
##### Evaluation of neutral voltages in arc suppression coil systems
Burgess, R. and Ahfock, A.. 2013. "Evaluation of neutral voltages in arc suppression coil systems." Australian Journal of Electrical and Electronics Engineering. 10 (1), pp. 127-136. https://doi.org/10.7158/1448837X.2013.11464362
##### Extending SWER line capacity
Helwig, Andreas and Ahfock, Tony. 2013. "Extending SWER line capacity." 23rd Australasian Universities Power Engineering Conference (AUPEC 2013). Hobart, Australia 29 Sep - 03 Oct 2013 Piscataway, NJ. United States. https://doi.org/10.1109/AUPEC.2013.6725427
##### Improving clinical practice outcomes for nurses with an interactive emulator
Bowtell, Les, Kist, Alexander A., Osbourne, Daniel and Parker, Victoria. 2013. "Improving clinical practice outcomes for nurses with an interactive emulator." 2013 IEEE Global Engineering Education Conference (EDUCON). Berlin, Germany 13 - 15 Mar 2013 United States. https://doi.org/10.1109/EduCon.2013.6530246
##### Long-life nickel iron battery functionality/cost comparison for peak demand SWER network voltage support application
Helwig, Andreas and Ahfock, Tony. 2013. "Long-life nickel iron battery functionality/cost comparison for peak demand SWER network voltage support application." 23rd Australasian Universities Power Engineering Conference (AUPEC 2013). Hobart, Australia 29 Sep - 03 Oct 2013 Piscataway, NJ. United States. https://doi.org/10.1109/AUPEC.2013.6725377
##### Student focus groups
Gibbings, Peter and Bowtell, Les. 2013. "Student focus groups." Lemckert, Charles, Jenkins, Graham and Lang-Lemckert, Susan (ed.) 24th Annual Conference of the Australasian Association for Engineering Education (AAEE 2013). Gold Coast, Australia 08 - 11 Dec 2013 Brisbane, Australia.
##### Assessment of electric field distribution in anisotropic cortical and subcortical regions under the influence of tDCS
Shahid, Salman, Wen, Peng and Ahfock, Tony. 2014. "Assessment of electric field distribution in anisotropic cortical and subcortical regions under the influence of tDCS." Bioelectromagnetics. 35 (1), pp. 41-57. https://doi.org/10.1002/bem.21814
##### Interactive emulator system to aid clinical practice outcomes for nurses
Bowtell, Les, Kist, Alexander A., Osbourne, Daniel and Parker, Victoria R.. 2013. "Interactive emulator system to aid clinical practice outcomes for nurses." International Journal of Online Engineering. 9 (S5), pp. 32-37. https://doi.org/10.3991/ijoe.v9iS5.2771
##### Enhancing nursing education with remote access laboratories
Bowtell, Les, Moloney, Clint, Kist, Alexander A., Parker, Victoria, Maxwell, Andrew and Reedy, Natasha. 2012. "Enhancing nursing education with remote access laboratories." International Journal of Online Engineering. 8 (Special Issue), pp. 52-59. https://doi.org/10.3991/ijoe.v8iS4.2279
##### Effects of model complexity and tissue anisotropic conductivity on cortical modulation during transcranial direct current stimulation
Shahid, S., Wen, P. and Ahfock, T.. 2012. "Effects of model complexity and tissue anisotropic conductivity on cortical modulation during transcranial direct current stimulation." IET Science, Measurement and Technology. 6 (6), pp. 464-473. https://doi.org/10.1049/iet-smt.2012.0014
##### Numerical investigation of white matter anisotropic conductivity in defining current distribution under tDCS
Shahid, Salman, Wen, Peng and Ahfock, Tony. 2013. "Numerical investigation of white matter anisotropic conductivity in defining current distribution under tDCS." Computer Methods and Programs in Biomedicine. 109 (1), pp. 48-64. https://doi.org/10.1016/j.cmpb.2012.09.001
##### Using remote access laboratories in nursing education
Bowtell, Les, Moloney, Clint, Kist, Alexander A., Parker, Victoria, Maxwell, Andrew and Reedy, Natasha. 2012. "Using remote access laboratories in nursing education." 9th International Conference on Remote Engineering and Virtual Instrumentation (REV 2012). Bilbao, Spain 04 - 06 Jun 2012 Piscataway, NJ. United States. https://doi.org/10.1109/REV.2012.6293148
##### Sizing nickel iron batteries for RAPS systems
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
##### 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.
##### 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.