Micro-Grid Smooth Switchover Method Based on Controller State Following


Micro-grid smooth switchover between different operation modes is important for steady operation and reliable power supply of micro-grid. In order to reduce the transient fluctuation of voltage and frequency during switchover, this paper proposed a new switchover method based on controller state following. When transferring to island mode, the control method for inverter of storage device changed from PQ control to V/f control. Before switchover, the output of V/f controller is always following the output of PQ controller. So that the sudden change of output is avoided at the moment of switchover. A micro-grid model with photovoltaic and battery is built on DIgSILENT Power Factory simulation software, to simulate micro-grid switchover from grid-connected mode to island mode. Results show this method can effectively suppress the transient fluctuation of voltage and frequency, and reduce the influence of transient process on power grid. This conclusion has important practical significance on micro-grid smooth switchover from grid-con- nected mode to island mode.

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Fu, Y. , Huang, L. and Zhao, J. (2015) Micro-Grid Smooth Switchover Method Based on Controller State Following. Journal of Power and Energy Engineering, 3, 128-135. doi: 10.4236/jpee.2015.34019.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Wu, X., Yin, X.G., Wei, Q., et al. (2013) Research on Microgrid and Its Application in China. Energy and Power Engineering, 5, 171-176. http://dx.doi.org/10.4236/epe.2013.54B033
[2] Zhou, X.X., Chen, S.Y. and Lu, Z.X. (2013) Review and Prospect for Power System Development and Related Technologies: A Concept of Three-Generation Power Systems. Proceedings of the CSEE, 33, 1-11.
[3] Ariyasinghe, M. and Hemapala, K. (2013) Microgrid Test-Beds and Its Control Strategies. Smart Grid and Renewable Energy, 4, 11-17. http://dx.doi.org/10.4236/sgre.2013.41002
[4] Turner, G., Kelley, P.J. and Storm, L.C. (2014) Design and Active Control of a Microgrid Testbed. IEEE Transactions on Smart Grid, 40, 1432-1436.
[5] Wang, X.H. and Zhang, C.J. (2012) Study of Control Strategy for Seamless Transfer of Grid-Connected Distributed Generation Systems. Transactions of China Electrotechnical Society, 27, 217-222.
[6] Yang, Z.G., Wang, C.S. and Che, Y.B. (2009) A Small-Scale Microgrid System with Flexible Modes of Operation. Automation of Electric Power Systems, 33, 89-92.
[7] Liu, Z.W., Xia, W.B. and Liu, M.B. (2013) Control Method and Strategy for Smooth Switchover of Micro-Grid Operation Modes Based on Complex Energy Storage. Power System Technology, 27, 906-913.
[8] Ren, B.Y., Tong, X.Q., Tian, S., et al. (2010) Research on the Control Strategy of Inverters in the Micro-Grid. Power and Energy Engineering Conference (APPEEC), Asia-Pacific, Chengdu, 28-31March 2010, 1-4. http://dx.doi.org/10.1109/APPEEC.2010.5448341
[9] Zhao, D.M., Zhang, N. and Liu, Y.H. (2013) Synthetical Control Strategy for Smooth Switching between Grid-Connected and Islanded Operation Modes of Microgrid Based on Energy Storage System. Power System Technology, 37, 301- 306.

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