A distributed secondary control strategy for power sharing and voltage regulation by multiple converters in DC micro-grids

Paper

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
Paper/Presentation Title

A distributed secondary control strategy for power sharing and voltage regulation by multiple converters in DC micro-grids

Presentation TypePaper
AuthorsUllah, Shahid (Author), Haidar, Ahmed M. A. (Author), Muttaqi, Kashem M. (Author) and Ahfock, Tony (Author)
Journal or Proceedings Title2019 IEEE International Conference on Electrical, Control and Instrumentation Engineering (ICECIE 2019) Proceedings
Article Number19304269
Number of Pages8
Year2019
Place of PublicationUnited States
ISBN9781728139395
9781728139401
Digital Object Identifier (DOI)https://doi.org/10.1109/ICECIE47765.2019.8974711
Web Address (URL) of Paperhttps://ieeexplore.ieee.org/document/8974711
Web Address (URL) of Conference Proceedingshttps://ieeexplore.ieee.org/xpl/conhome/8964268/proceeding
Conference/Event2019 IEEE International Conference on Electrical, Control and Instrumentation Engineering (ICECIE 2019)
Event Details
2019 IEEE International Conference on Electrical, Control and Instrumentation Engineering (ICECIE 2019)
Event Date
25 Nov 2019
Event Location
Kuala Lumpur, Malaysia
Abstract

Recent research and advancement in DC systems reveal that DC distribution may be an efficient, reliable and economical solution to avoid the inherent issues associated with AC power systems such as frequency control, harmonics and synchronization. However, some key operational issues in DC micro-grids are to ensure a stable output voltage and proper load sharing among the sources. Improper current sharing and voltage variations in the conventional droop control causes circulating currents due to the presence of droop and line resistance between converters. This paper presents a distributed secondary control strategy to smooth the output voltage and maintain power sharing based on average current/voltage control and circulating current minimization. Further, an additional current feedback loop is introduced to modify the micro-grid reference voltage during overload conditions for minimizing the line voltage drop and power losses. The conventional communication links are used for exchanging information to the relevant controllers simultaneously to implement the proposed distributed control. The performance of the proposed approach has been verified by simulating two parallel Buck converters supplying a common load. The effect of load switching on voltage regulation and power sharing has also been analyzed.

KeywordsDC micro-grid, DC-DC converters, multi-tap reference voltage, power sharing
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400799. Control engineering, mechatronics and robotics not elsewhere classified
400803. Electrical energy generation (incl. renewables, excl. photovoltaics)
400899. Electrical engineering not elsewhere classified
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Byline AffiliationsUniversity of Malaysia, Sarawak, Malaysia
School of Mechanical and Electrical Engineering
University of Wollongong
Institution of OriginUniversity of Southern Queensland
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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
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.
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.