Sliding Droop Control For Distributed Generation In Microgrids

Bruno W. França; Emanuel L. van Emmerik; Juliano F. Caldeira; Maurício Aredes

doi:10.18618/REP.2017.4.2726

Authors

Bruno W. França Department of Electrical Engineering, Fluminense Federal University, Niterói – RJ, Brazil
Emanuel L. van Emmerik Department of Electrical Engineering, Federal University of Rio de Janeiro, Rio de Janeiro – RJ, Brazil
Juliano F. Caldeira Department of Electrical Engineering, Federal University of Rio de Janeiro, Rio de Janeiro – RJ, Brazil
Maurício Aredes Department of Electrical Engineering, Federal University of Rio de Janeiro, Rio de Janeiro – RJ, Brazil

DOI:

https://doi.org/10.18618/REP.2017.4.2726

Keywords:

Distributed Generation, Droop Control, Microgrid, Static Synchronous Generator, Synchronverter

Abstract

This paper proposes a fully autonomous controller that slides the droop curves of a Static Synchronous Generator, avoiding the need of hierarchical controllers to perform power sharing and frequency and voltage regulation. The aim of this controller is to enhance the primary controller in order to perform additional functionalities in a similar way as those performed in a secondary control level hierarchy, avoiding the need of a communication- system and without mischaracterizing the primary behavior as a virtual synchronous machine. The proposed seamless controller is still compatible with conventional communication-systems, and can receive inputs from hierarchical controllers. In grid-connected microgrids, distributed generation (DG) units perform active-power supply and adequate voltage regulation, whereas the system frequency is imposed by the grid. Contrarily, in islanded microgrids, DG units have to perform active-power sharing between all units, reactive-power sharing, as well as to ensure adequate frequency control and voltage regulation. When static droop curves are employed, power dispatch planning along with coordinated set of DG units is required to achieve accurate active-power sharing. This drawback is mitigated with the proposed fully autonomous controller. Simulation results were obtained in a microgrid scenario to demonstrate the effective approach for power sharing. Experimental results are also presented.

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Author Biographies

Bruno W. França, Department of Electrical Engineering, Fluminense Federal University, Niterói – RJ, Brazil

, born in 05/27/1986 in Rio de Janeiro, Brazil, is an electrical engineer (2009 Cum Laude), master (2012) and doctor in Electrical Engineering (2016) with the Federal University of Rio de Janeiro, COPPE/UFRJ. He is currently an Adjunct Professor I at Fluminense Federal University. His areas of interest are: power electronics, distributed generation, power quality, renewable energy, FACTS and active filters. Dr. França is member of the SOBRAEP and IEEE.

Emanuel L. van Emmerik, Department of Electrical Engineering, Federal University of Rio de Janeiro, Rio de Janeiro – RJ, Brazil

, born in 10/25/1968 in Leiden, the Netherlands, is an electrical engineer and master (1991 Cum Laude) in Electrical Engineering with the Technical University of Delft. Since 2002 he is a researcher of Laboratory LEMT, COPPE/UFRJ where he started his D.Sc. in Electrical Engineering in 2013. His areas of interest are microgrids, distributed generation, FACTS, power systems and drives. Emanuel is member of the SOBRAEP.

Juliano F. Caldeira, Department of Electrical Engineering, Federal University of Rio de Janeiro, Rio de Janeiro – RJ, Brazil

, born in 11/12/1978 in Rio de Janeiro, Brazil, is an electronic engineer (2008) and master in Electrical Engineering (2012) with the Federal University of Rio de Janeiro, COPPE/UFRJ. In 2013 he started his D.Sc. in Electrical Engineering at COPPE/UFRJ. His areas of interest are smart energy metering, NILM, microgrids, energy efficiency and machine learning.

Maurício Aredes, Department of Electrical Engineering, Federal University of Rio de Janeiro, Rio de Janeiro – RJ, Brazil

, born in 14/08/1961 in São Paulo, Brazil, is an electrical engineer (1984) with the Fluminense Federal University, master (1991) with the Federal University of Rio de Janeiro and doctor in Electrical Engineering. (1996 Hons.) with the Technische Universitat Berlim. Currently, he is an Associate Professor at the Federal University of Rio de Janeiro, where he lectures Power Electronics. From 1985 to 1997, he was P&D-Engineer at the Research Center of Electric Energy (CEPEL), Rio de Janeiro. His research areas include HVDC systems, FACTS, active filters, custom power and power quality. Dr. Aredes is member of the SOBRAEP and senior member of IEEE.

References

J. M. Guerrero, "Connecting renewable energy sources into the smart grid," in IEEE International Symposium on Industrial Electronics (ISIE), pp. 2400-2566, 2011.https://doi.org/10.1109/ISIE.2011.5984420 DOI: https://doi.org/10.1109/ISIE.2011.5984420

F. Blaabjerg, R. Teodorescu, M. Liserre, A. V. Timbus, "Overview of Control and Grid Synchronization for Distributed Power Generation Systems," IEEE Transactions on Industrial Electronics, vol. 53, no. 5,pp. 1398-1409, October 2006.https://doi.org/10.1109/TIE.2006.881997 DOI: https://doi.org/10.1109/TIE.2006.881997

J. M. Carrasco, L. G. Franquelo, J. T. Bialasiewicz, E. Galván, R. C. P. Guisado, M. A. M. Prats, J. I. León, N. Moreno-Alfonso, "Power-Electronic Systems for the Grid Integration of Renewable Energy Sources: A Survey," IEEE Transactions on Industrial Electronics, vol. 53, no. 4, pp. 1002-1016, August 2006.https://doi.org/10.1109/TIE.2006.878356 DOI: https://doi.org/10.1109/TIE.2006.878356

Q.-C. Zhong, G. Weiss, "Static synchronous generators for distributed generation and renewable energy," in IEEE/PES Power Systems Conference and Exposition, PSCE, pp. 1-6, 2009.https://doi.org/10.1109/PSCE.2009.4840013 DOI: https://doi.org/10.1109/PSCE.2009.4840013

Q.-C. Zhong, G. Weiss, "Synchronverters: Inverters That Mimic Synchronous Generators," IEEE Transactions on Industrial Electronics, vol. 58, no. 4, pp. 1259-1267, April 2011.https://doi.org/10.1109/TIE.2010.2048839 DOI: https://doi.org/10.1109/TIE.2010.2048839

Z. Ma, Q.-C. Zhong, J. D. Yan, "Synchronverter-based control strategies for three-phase PWM rectifiers," in 7th IEEE Conference on Industrial Electronics and Applications (ICIEA), pp. 225-230, 2012.https://doi.org/10.1109/ICIEA.2012.6360727 DOI: https://doi.org/10.1109/ICIEA.2012.6360727

P.-L. Nguyen, Q.-C. Zhong, F. Blaabjerg, J. M. Guerrero, "Synchronverter-based operation of STATCOM to Mimic Synchronous Condensers," in 7th IEEE Conference on Industrial Electronics and Applications (ICIEA), pp. 942-947, 2012.

P. Rodriguez, I. Candela, A. Luna, "Control of PV generation systems using the synchronous power controller," in IEEE Energy Conversion Congress and Exposition (ECCE), pp. 993-998, 2013.https://doi.org/10.1109/ECCE.2013.6646811 DOI: https://doi.org/10.1109/ECCE.2013.6646811

Q.-C. Zhong, "Power-Electronics-Enabled Autonomous Power Systems: Architecture and Technical Routes," IEEE Transactions on Industrial Electronics, vol. 64,no. 7, pp. 5907-5918, July 2017.https://doi.org/10.1109/TIE.2017.2677339 DOI: https://doi.org/10.1109/TIE.2017.2677339

J. C. Vasquez, J. M. Guerrero, A. Luna, P. Rodriguez, R. Teodorescu, "Adaptive Droop Control Applied to Voltage-Source Inverters Operating in Grid-Connected and Islanded Modes," IEEE Transactions on Industrial Electronics, vol. 56, no. 10, pp. 4088-4096, October 2009.https://doi.org/10.1109/TIE.2009.2027921 DOI: https://doi.org/10.1109/TIE.2009.2027921

A. Mondal, M. S. Illindala, A. S. Khalsa, D. A. Klapp, J. H. Eto, "Design and Operation of Smart Loads to Prevent Stalling in a Microgrid," IEEE Transactions on Industry Applications, vol. 52, no. 2, pp. 1184-1192, March-April 2016.https://doi.org/10.1109/TIA.2015.2483579 DOI: https://doi.org/10.1109/TIA.2015.2483579

Y. Han, H. Li, L. Xu, X. Zhao, J. Guerrero, "Analysis of Washout Filter-Based Power Sharing Strategy-An Equivalent Secondary Controller For Islanded Microgrid without LBC Lines," IEEE Transactions on Smart Grid , vol. PP, pp. 1-1, 2017.

J. W. Simpson-Porco, Q. Shafiee, F. Dörfler, J. C. Vasquez, J. M. Guerrero, F. Bullo, "Secondary Frequency and Voltage Control of Islanded Microgrids via Distributed Averaging," IEEE Transactions on Industrial Electronics, vol. 62, no.11, pp. 7025-7038, Nov. 2015.https://doi.org/10.1109/TIE.2015.2436879 DOI: https://doi.org/10.1109/TIE.2015.2436879

J. M. Guerrero, J. C. Vasquez, J. Matas, M. Castilla, L. G. de Vicuna, "Control Strategy for Flexible Microgrid Based on Parallel Line-Interactive UPS Systems," IEEE Transactions on Industrial Electronics, vol. 56, no. 3,pp. 726-736, March 2009.https://doi.org/10.1109/TIE.2008.2009274 DOI: https://doi.org/10.1109/TIE.2008.2009274

C.-T. Lee, C.-C. Chu, P.-T. Cheng, "A new droop control method for the autonomous operation of distributed energy resource interface converters," in IEEE Energy Conversion Congress and Exposition (ECCE), pp. 702-709, 2010.https://doi.org/10.1109/ECCE.2010.5617936 DOI: https://doi.org/10.1109/ECCE.2010.5617936

H. Han, Y. Liu, Y. Sun, M. Su, J. M. Guerrero, "An Improved Droop Control Strategy for Reactive Power Sharing in Islanded Microgrid," IEEE Transactions on Power Electronics, vol. 30, no. 6, pp. 3133-3141, June2015.https://doi.org/10.1109/TPEL.2014.2332181 DOI: https://doi.org/10.1109/TPEL.2014.2332181

P. Kundur, Power System Stability and Control, McGrawHill Professional, 1994.

S. Chapman, Electric Machinery Fundamentals, 5th ed., New York: McGraw-Hill Science/Engineering/Math, 2011.

J. M. Guerrero, M. Chandorkar, T. L. Lee, P. C. Loh, "Advanced Control Architectures for Intelligent Microgrids-Part I: Decentralized and Hierarchical Control," IEEE Transactions on Industrial Electronics, vol. 60, no.4, pp. 1254-1262, April 2013.https://doi.org/10.1109/TIE.2012.2194969 DOI: https://doi.org/10.1109/TIE.2012.2194969

J. Driesen, K. Visscher, "Virtual synchronous generators," in IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, pp. 1-3, 2008.https://doi.org/10.1109/PES.2008.4596800 DOI: https://doi.org/10.1109/PES.2008.4596800

F. Gao, M. R. Iravani, "A Control Strategy for a Distributed Generation Unit in Grid-Connected and Autonomous Modes of Operation," IEEE Transactions on Power Delivery, vol. 23, no. 2, pp. 850-859, April 2008.https://doi.org/10.1109/TPWRD.2007.915950 DOI: https://doi.org/10.1109/TPWRD.2007.915950

M. Karimi-Ghartemani, S. A. Khajehoddin, P. Piya, M. Ebrahimi, "Universal Controller for Three-Phase Inverters in a Microgrid," IEEE Journal of Emerging and Selected Topics in Power Electronics, vol. 4, no. 4, pp. 1342-1353, Dec. 2016.https://doi.org/10.1109/JESTPE.2016.2614956 DOI: https://doi.org/10.1109/JESTPE.2016.2614956

Q.-C. Zhong, "Robust Droop Controller for Accurate Proportional Load Sharing Among Inverters Operated in Parallel," IEEE Transactions on Industrial Electronics, vol. 60, no. 4, pp. 1281-1290, April 2013.https://doi.org/10.1109/TIE.2011.2146221 DOI: https://doi.org/10.1109/TIE.2011.2146221

IEEE Application Guide for IEEE Std 1547(TM), IEEE Standard for Interconnecting Distributed Resources with Electric Power Systems, IEEE Std 1547.2-2008, pp. 1-217, April 2009.

IEEE Standard for Interconnecting Distributed

Eletrôn. Potên., Joinville, v. 22, n. 4, p. 429-439, out./dez. 2017439Resources with Electric Power Systems - Amendment 1,IEEE Std 1547a-2014 (Amendment to IEEE Std 1547-2003), pp. 1-16, May 2014.

E. Robles, J. Pou, S. Ceballos, J. Zaragoza, J. L. Martín, P. Ibañez, "Frequency-Adaptive Stationary-Reference-Frame Grid Voltage Sequence Detector for Distributed Generation Systems," IEEE Transactions on Industrial Electronics, vol. 58, no. 9, pp. 4275-4287, Sep. 2011.https://doi.org/10.1109/TIE.2010.2098352 DOI: https://doi.org/10.1109/TIE.2010.2098352

Q.-C. Zhong, G. C. Konstantopoulos, B. Ren, M. Krstic, "Improved Synchronverters with Bounded Frequency and Voltage for Smart Grid Integration," IEEE Transactions on Smart Grid , vol. PP, no. 99, pp. 1-1, 2016.

E. Rodriguez-Diaz, F. D. Freijedo, M. S. Golsorkhi, J. C. Vasquez, J. M. Guerrero, "A root-locus design methodology derived from the impedance stability criterion and its application for LCL grid-connected converters," in 18th European Conference on Power Electronics and Applications (EPE ECCE Europe), pp. 1-10, 2016https://doi.org/10.1109/EPE.2016.7695473 DOI: https://doi.org/10.1109/EPE.2016.7695473