Impact and Utilization of Emerging PHEV in Smart Power Systems
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Impact and Utilization of Emerging PHEV in Smart Power Systems F. M. Rabiul Islam A thesis submitted in fulfilment of the requirements of the degree of Doctor of Philosophy SCIENTIA MANU E T MENTE School of Engineering and Information Technology The University of New South Wales Canberra, Australia May 2013 Abstract Stability and quality are two important issues for the operation of power systems as an unsecured system faces a lot of unusual operating conditions due to which it can undergo blackouts and incur huge losses. In addition, the demand for electrical energy continues to grow steadily. Electric grid upgrades, and especially the con- struction of new transmission lines and loads, cannot keep pace with the demand for increasing power plant capacity and energy for various reasons. The changing characteristics and new loads of power systems continue to provide new challenges for system designers and operators. A plug-in hybrid electric vehicle (PHEV) is such a load, which can have huge impact on, and provide many opportunities for, power systems. In the planning and design of a distribution system, PHEVs are one of the most important factors as they can be a spinning reserve of energy, as well as a major load for distribution networks. The first contribution of this work is to identify the charging effect of dynamic PHEVs in a power system for which a single-machine infinite-bus (SMIB) system, solar power system and a distribution system are used. A dynamic load model of PHEVs based on a third-order battery model is introduced. To determine the adequacy of a system, it is necessary to conduct a micro-level analysis to determine the impact of the PHEV loads on the grid. The scope of such an analysis covers the performances of wind and solar generation with dynamic PHEV loads, and ii Abstract iii small signal stability analysis of the power grid demonstrates that it is important to consider the dynamics of PHEV loads. A second and unique contribution of this thesis is the design of virtual active filter for power systems using V2G technology. Nonlinear loads, inverters and con- verters used for rectifying or inverting operations absorb reactive power from the connected bus, the compensation of which is essential in power system. Moreover, the nonlinear behavior of power electronic devices produce harmonics in power net- works which are filtered by passive and active filters. Due to the increasing interest in power electronics-based nonlinear loads, the reactive power compensation and harmonic reduction method should be improved but doing so would increase the total cost as well as hardware and control complexity. In this thesis, the V2G tech- nology is used to design a virtual active filter based on the instantaneous power theory (p-q theory). The potential of a low-cost solution to the power quality prob- lem that utilizes the reactive power and filtering capabilities of PHEVs parked in charging stations is investigated. Simulations are performed for various power sys- tem networks to demonstrate that the proposed virtual active filter improves power quality while meeting IEEE standards. The other significant contribution of this research is the design of FACTS devices using V2G technology, which can fulfill multiple power flow control objectives, such as the needs of reactive shunt compensation, phase shifting and series compensation. However, as current FACTS devices are quite expensive, they are not widely used. Abstract iv Therefore, in this dissertation, the potential of PHEVs in a V2G mode of operation, which provides a low-cost solution for designs of virtual FACTS devices (UPFC, UPQC, DVR) using a PHEV charging station, is explained. Simulations undertaken demonstrate that PHEVs have the potential to work as virtual FACTS devices to improve power quality. Finally, a benchmark distribution network and microgrid are used to verify the performances of the proposed filter and FACTS devices. Acknowledgements Foremost, I would like to express my sincere gratitude and appreciation to my su- pervisor, Associate Professor Hemanshu Roy Pota, for his support, patience, and encouragement throughout my PhD study. His technical and editorial advice has been essential for the completion of this dissertation. He is not only my supervi- sor but has also encouraged and challenged me throughout my academic research. Despite his busy schedule, he always manages to squeeze in a meeting when there is a need. Thanks to his remarkable engineering intuition, open-mindedness, and endless enthusiasm, I have always left those meetings in a happy and illuminated mood. My sincere appreciation goes to fellow group members for making my time en- joyable in Canberra. I also thank people who were not part of my group but helped me out. Furthermore, I would like to thank all members of the institute for contributing to such an inspiring and pleasant atmosphere. I would like to thank Pam Giannakakis, Joan Woodward, Elizabeth Carey, Denise Russell for the general administrative support they provided to me. Software support for computing issues from Jon Lowrey, Mrs Eri Rigg, Michael Lanza and Mike Wilson was invaluable. I also thank John Davis and the building officer, Ty Everett, who provided me with day-to-day infrastructure support. v Acknowledgements vi My appreciation goes to fellow postgraduate students for making my journey a memorable experience and sharing friendship during the past few years. My sincere thanks go to those who, either nearby or at a distance, were concerned about my studies and me. I also wish to extend my warmest thanks to my friends in the University and community who have made my life in the Australian Capital Territory fruitful and enjoyable. Moreover, I am grateful for the enormous support and understanding of my loving wife, Farjana Afrin, my sons, Ahmed Abdullah Ayan and Anuvob Abdullah Shayan. I would like to thank very much my mother, brother as well as sister for their never-ending support and inspiration during my long stay in Australian Capital Territory. Last, but certainly not least, I am indebted to the School of Engineering and Information Technology at The University of New South Wales and the Australian Research Council for their financial support and the opportunity to embark on this PhD journey. Dedicated to My parents, my siblings My wife, Farjana Afrin And My sons, Ahmed Abdullah Ayan and Anuvob Abdullah Shayan List of Publications Refereed Journal Papers 1. F. R. Islam and H. R. Pota, \Impact of Dynamic PHEV Load on Photo- voltaic System," International Journal of Electrical and Computer Engineering (IJECE), vol. 2, no. 5, pp. 644{654, October 2012. 2. F. R. Islam and H. R. Pota, \PHEVs Park as Virtual UPFC" TELKOMNIKA Indonesian Journal of Electrical Engineering, vol. 10 no.8, pp. 1701{1708, December 2012. 3. F. R. Islam and H. R. Pota, \Plug in Hybrid Electric Vehicles Park as Virtual DVR" IET Electronics Letters , vol. 49 no.3, January 2013. 4. F. R. Islam and H. R. Pota, \V2G Technology to Design Smart Active Filter for Solar Power System" International Journal of Power Electronics and Drive System (IJPEDS), vol. 3 no.1, March 2013. 5. F. R. Islam and H. R. Pota, \Virtual Active Filter for HVDC Networks using V2G Technology" International Journal of Electrical Power and Energy Sys- tems (IJEPES), Under review, Submitted on July 2012, Manuscript Number: IJEPES-D-12-00650 Refereed Conference Papers 6. F.R. Islam, H.R. Pota, M.A. Mahmud and M.J. Hossain, \Impact of PHEV viii ix Loads on the Dynamic Performance of Power System," 20th Australasian Uni- versities Power Engineering Conference (AUPEC), New Zealand , pp.1-5, 5-8 Dec. 2010 7. F.R. Islam, H.R. Pota and M.S. Ali, \V2G Technology for Designing Active Filter System to Improve Wind Power Quality," 21st Australasian Universities Power Engineering Conference (AUPEC), Brisbane, Australia , pp.1-6, 25-28 Sept. 2011 8. F. R. Islam and H. R. Pota, \V2G Technology to Improve Power Quality" European Electric Vehicle Congress, Brussels, Belgium. 25-18 Oct. 2011 9. F. R. Islam and H. R. Pota, \Smart Operation of Microgrid with PHEV." European Electric Vehicle Congress, Brussels, Belgium. 25-28 Oct. 2011 10. F. R. Islam and H. R. Pota, \Smart Microgrid with Renewable Energy and PHEV." International Conference on Energy and Meteorology Weather and Climate for the Energy Industry, Gold coast, Australia 8-11 Nov. 2011 11. F.R. Islam and H.R. Pota, \Design a PV-AF System using V2G Technology to Improve Power Quality," IECON 2011 - 37th Annual Conference on IEEE Industrial Electronics Society, 2011 21st Australasian , pp.861-866, 7-10 Nov. 2011 12. F.R. Islam and H.R. Pota, \Impact of Dynamic PHEVs Load on Renewable Sources Based Distribution System," IECON 2011 - 37th Annual Conference on IEEE Industrial Electronics Society, 2011 21st Australasian , pp.4698-4703, x 7-10 Nov. 2011 13. F.R. Islam and H.R. Pota, \V2G Technology to Improve Wind Power Quality and Stability," Australian Control Conference (AUCC) 2011, pp.452-457, 10- 11 Nov. 2011 14. F.R. Islam, H.R. Pota and A.B.M. Nasiruzzaman, \PHEV's Park as a Virtual Active Filter for HVDC Networks," 11th International Conference on Envi- ronment and Electrical Engineering (EEEIC), 2012, pp.885-890, 18-25 May 2012 15. F.R. Islam, H.R. Pota and M.S. Ali, \V2G Technology to Design a Virtual UPFC," 11th International Conference on Environment and Electrical Engi- neering (EEEIC), 2012, pp.568-573, 18-25 May 2012 16. F.R. Islam, H.R. Pota and A.B.M. Nasiruzzaman, \Design a Unified Power Quality Conditioner using V2G Technology," IEEE International Power Engi- neering and Optimization Conference (PEOCO), 2012, pp.521-526, 6-7 June 2012 17.