Supervisory Control of a Hybrid AC/DC Micro-Grid with Load Shedding Based on the Bankruptcy Problem

Document Type : Research Article


School of Electrical and Computer Engineering, University of Tehran


In this paper, a supervisory controller is proposed to manage the power flow in a hybrid AC/DC micro-grid for both grid-connected and disconnected modes. When the hybrid AC/DC micro-grid is connected to the utility grid, power surplus or shortage leads to power trade between the micro-grid and the utility grid. In the grid-disconnected mode, the renewable power sources (wind and solar generation subsystems) are responsible of supplying the power demanded by the loads by themselves. In this case, the loads are classified as critical and non-critical loads, where critical loads are those that should be supplied in any condition. When the maximum available power is smaller than the power demanded by the critical loads, the battery banks are set in the discharging mode to satisfy the demand. Otherwise, the non-critical loads are supplied according to the proposed load shedding scheme, which is developed based on the bankruptcy problem. In summary, this paper proposes a new supervisory controller for a hybrid AC/DC micro-grid, as well as a new load shedding scheme to supply the non-critical load in grid-disconnected mode. The effectiveness of the proposed supervisor controller is evaluated through simulation.


[1] P. Wang, L. Geol, X. Liu and F. H. Choo,“Harmonizing AC and DC: A Hybrid AC/DC Future Grid Solution,” IEEE Power & Energy Magazine, Vol. 11, No. 3, pp. 76-83, 2013.
[2] X. Liu, P. Wang and P. C. Loh, “A hybrid AC/DC micro-grid,” in Proceedings of the International Power Electroics. Conference, Singapore, pp. 746–751, 2010.
[3] F. Valenciaga and P. F. Puleston, “Supervisory Control for a Stand-Alone Hybrid Generation System Using Wind and Photovotaic Energy,”IEEE Transactions on Energy Conversion, Vol. 20,No. 2, pp. 398-405, 2005.
[4] W. Qi, J. Liu, X. Chen and P. D. Christofides,“Supervisory Predictive Control of Standalone Wind/Solar Energy Generation Systems,” IEEE Transactions on Control Systems Technology, Vol.19, No. 1, pp. 199-207, 2011.
[5] W. Qi, J. Liu and P. D. Christofides, “Distributed Supervisory Predictive Control of Distributed Wind and Solar Energy Systems,” IEEE Transactions on Control Systems Technology, Vol.21, No. 2, pp. 504-512, 2013.
[6] W. Qi, J. Liu and P. D. Christofides, “A distributed control framework for smart grid development: Energy/water system optimal operation and electric grid integration,” Journal of Process Control, Vol.21, pp. 1504-1516, 2011.
[7] W. Qi, J. Liu and P. D. Christofides, “Supervisory Predictive Control for Long-Term Scheduling of an Integrated Wind/Solar Energy Generation and Water Desalination System,” IEEE Transactions on Control Systems Technology, Vol. 20, No. 2,
pp. 504-512, 2012.
[8] G. Seenumani, J. Sun and H. Peng, “A Hierarchical Optimal Control Strategy for Power Management of Hybrid Power Systems in All Electric Ships Applications,” 49th IEEE Conference on Decision and Control, Hilton Atlanta Hotel, Atlanta, GA, USA, 15-17 December 2010.
[9] G. Seenumani, H. Peng and J. Sun, “A reference governor-based hierarchical control for failure mode power management of hybrid power systems for all-electric ships,” Journal of power sources,Vol. 196, pp. 1599-1607, 2011.
[10] G. Seenumani, J. Sun and H. Peng, “Real-Time Power Manaement of Integrated Power Systems in All Electric Ships Leveraging Multi Time Scale Property,” IEEE Transactions on Control Systems Technology, Vol. 20, No. 1, pp. 232-240, 2012.
[11] X. Liu, P. Wang and P. C. Loh, “A Hybrid AC/DC Microgrid and Its Coordination Control,” IEEE Transactions on Smart Grid, Vol. 2, No. 2, pp. 278-286, 2011.
[12] C. Jin, P. C. Loh, P. Wang, Y. Mi and F. Blaabjerg,“Autonomous Operation of Hybrid AC-DC Microgrids,” in Proceedings of IEEE international conference on sustainable energy technologies (ICSET), Kandy Sri Lanka, Dec. 6-9, 2010.
[13] J. M. Guerrero, P. C. Loh, T. L. Lee and M. Chandorkar, “Advanced Control Architectures for Intelligent Microgrids-Part II: Power Quality, Energy Storage, and AC/DC Microgrids,” IEEE Transactions on Industrial Electronics, Vol. 60, No.
4, pp. 1263-1270, 2013.
[14] G. Ding, F. Gao, S. Zhang, P. C. Loh and F.Blaabjerg, “Control of hybrid AC/DC microgrid under islanding operational conditions,” Journal of Modern Power Systems and Clean Energy, Vol. 2,No. 2, pp. 223-232, 2014.
[15] R. Geiriha and R. Arivalahan, “Power Management and Decentralized Control of Interlinking Converter by Interfacing AC and DC
Micro grids,” International Journal of Engineering Science and Innovative Technology (IJESIT), Vol. 3, No. 6, pp. 136-146, 2014.
[16] N. Eghtedarpour and E. Farjah, “Power Control and Management in a Hybrid AC/DC Microgrid,”IEEE Transactions on Smart Grid, Vol. 5, No. 3,pp. 1494-1505, 2014.
[17] M. Hosseinzadeh and F. Rajaei Salmasi, “Power management of an isolated hybrid AC/DC microgrid with fuzzy control of battery banks,” IET Renewable Power Generation, vol. 9, no. 5, pp.484-493, 2015.
[18] R. M. Kamel, A. Chaouachi and K. Nagasaka,“Wind power smoothing using fuzzy logic pitch controller and energy capacitor system for improvement micro-grid performance in islanding mode,” Energy, Vol. 35, pp. 2119-2129, 2010.
[19] F. Valenciaga, P. F. Puleston, P. E. Battaiotto and R. J. Mantz, “Passivity/sliding mode control of a stand-alone hybrid generation system”, IEE Proceedings-Control Theory Applications, Vol.147, No. 6, pp. 680-686, 2000.
[20] K. H. Hussein, I. Muta, T. Hoshino and M. Osakada, “Maximum photovoltaic power tracking:an algorithm for rapidly changing atmospheric conditions,” IEE Proceedings Generation,Transmission and Distribution, Vol. 142, No. 1, pp.59-64, 1995.
[21] F. Valenciaga, P. F. Puleston and P. E. Battaiotto,“Power control of a photovoltaic array in a hybrid electric generationn system using sliding mode techniques,” IEE Proceedings-Control Theory Applications, Vol. 148, No. 6, pp. 448-455, 2001.
[22] H. M. Kim, T. Kinoshita and Y. Lim, “Talmudic Approach to Load Shedding of Islanded Microgrid Operation Based on Multiagent System,” Journal of Electrical Engineering and Technology, Vol. 6,No. 2, pp. 284-292, 2011.
[23] Y. Lim, H. M. Kim and T. Kinoshita, “Distributed Load-Shedding System for Agent-Based Autonomous Microgrid Operations,” Energies,Vol. 7, pp. 385-401, 2014.
[24] H. M. Kim, T. Kinoshita and T. H. Kim,“Bankruptcy Problem Approach to Load-Shedding in Agent-Based Microgrid Operation,” Security-Enriched Urban Computing and Smart Grid, Vol.78, pp. 621-628, 2010.
[25] H. M. Kim, T. Kinoshita, Y. Lim and T. H. Kim,“A Bankruptcy Poblem Approach to Loadshedding in Multiagent-based Microgrid
Operation,” Sensors, Vol. 10, pp. 8888-8898, 2010.
[26] H. M. Kim and T. Kinoshita, “A Comparative Study of Bankruptcy Rules for Load-Shedding Scheme in Agent-Based Microgrid Operation,”Ubiquitous Computing and Multimedia Applications, Vol. 151, pp. 145-152, 2011.
[27] R. J. Aumann and M. Maschler, “Game Theoritic Analysis of a Bankruptcy Problem from the Talmud,” Journal of Economic Theory, Vol. 36,pp. 195-213, 1985.
[28] F. Valenciaga, P. F. Puleston and P. E. Battaiotto,“Variable structure system control design method based on a differential geometric approach:application to a wind energy conversion subsystem,” IEE Proceedings-Control Theory Applications, Vol. 151, No. 1, pp. 6-12, 2004.