Mitigation of Unbalanced Voltage Sags and Voltage Unbalance in CIGRE Low Voltage Distribution Network

Ghullam Mustafa Bhutto, Birgitte Bak-Jensen, Pukar Mahat, Carlo Cecati

Department of Energy Technology, Aalborg University, Aalborg, Denmark.
Department of Energy Technology, Aalborg University, Aalborg, Denmark;Department of Electrical Power, Quaid-E-Awam University of Sciences & Technology, Nawabshah, Pakistan.
Department of Information Engineering, Computer Sciences and Mathematics, Via G. Gronchi, L’Aquila, Italy.

DOI: 10.4236/epe.2013.59060                

Abstract

Any problem with voltage in a power network is undesirable as it aggravates the quality of the power. Power electronic devices such as Voltage Source Converter (VSC) based Static Synchronous Compensator (STATCOM) etc. can be used to mitigate the voltage problems in the distribution system. The voltage problems dealt with in this paper are to show how to mitigate unbalanced voltage sags and voltage unbalance in the CIGRE Low Voltage (LV) test network and networks like this. The voltage unbalances, for the tested cases in the CIGRE LV test network are mainly due to single phase loads and due to unbalanced faults. The compensation of unbalanced voltage sags and voltage unbalance in the CIGRE distribution network is done by using the four STATCOM compensators already existing in the test grid. The simulations are carried out in DIgSILENT power factory software version 15.0.

Keywords

Power Quality; Unbalanced Voltage Sags; Mitigation of Voltage Unbalance; Voltage Unbalance Factor (VUF); Distributed Static Compensator (STATCOM)

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	IEEE Standard 1159-1995, “IEEE Recommended Practice for Monitoring Electric Power Quality,” IEEE, 1995.
[2]	H. J. B. Math, I. Y. H. Gu, P. G. V. Axelberg and E.Styvaktakis, “Classification of Underlying Causes of Power Quality Disturbances: Deterministic versus Statistical Methods,” EURASIP Journal on Applied Signal Processing, Vol. 1, 2007, pp. 172-172.
[3]	G. G. Karady, S. Saksena and B. Z. Shi, “Effects of Voltage Sags on House Hold Loads,” IEEE Power Engineering Society General Meeting, Vol. 3, 2005, pp. 24562461.
[4]	M. Mc Granaghan, D. R. Mueller and M. Samotyj, “Voltage Sag in Industrial Systems,” IEEE Transactions on Industry Applications, Vol. 29, 1993, pp. 397-403. http://dx.doi.org/10.1109/28.216550
[5]	M. T. Aung and J. V. Milanovic, “The Influence of Transformer Winding Connections on the Propagation of Voltage Sags,” IEEE Transactions on Power Delivery, Vol. 21, 2006.
[6]	W. R. Mendes, M. I. Samesima and F. A. Moura, “Influence of Power Transformer Winding Connections on the Propagation of Voltage Sags through Electric System,” Proceedings of the IEEE, 2008, pp. 1-6.
[7]	L. D. Zhang and M. H. J. Bollen, “A Method for Characterizing Unbalanced Voltage Dips (Sags) with Symmetrical Components,” IEEE Power Engineering Review, Vol. 18, No. 7, 1998, pp. 50-52. http://dx.doi.org/10.1109/MPER.1998.686958
[8]	C. Di Perna, P. Verde, A. Sannino, M. H. J. Bollen, “Static Series Compensator for Voltage Dip Mitigation with Zero-Sequence Injection Capability,” 2003 IEEE Bologna Power Tech Conference Proceedings, Bologna, 23-26 June 2003.
[9]	R.Teodorescu, M. Liserre and P. Rodríguez, “Grid Synchronization in Three Phase Power Converters,” In: Grid Converters for Photovoltaic and Wind Power Systems, John Wily & Sons Ltd., Chichester, 2011, pp. 169-181.
[10]	A. von Jouanne and B. B. Banerjee, “Voltage Unbalance: Power Quality Issues, Related Standards and Mitigation Techniques,” Electric Power Research Institute, Palo Alto, EPRI Final Rep, 2000.
[11]	Aneel, “Contribution for the Normalization of the Quality of Electric Power-Harmonic and Unbalances in the Electric Networks,” Ph.D. Thesis, Federal University of Uberlandia, 2000.
[12]	A. von Jouanne and B. Banerjee, “Assessment of Voltage Unbalance,” IEEE Transactions on Power Delivery, Vol. 16, No. 4, 2001, pp. 782-790.
[13]	F. C. Pereira, J. C. de Oliveira, O. C. N. Souto, A. L.A. Vilaca and P. F. Ribeiro, “An Analysis of Costs Related to the Loss of Power Quality,” Proceedings on Harmonics and Power Quality, Vol. 2, 1998, pp. 14-16.
[14]	V. J. Gosbell, S. Perera and V. Smith, “Voltage Unbalance,” Technical Power Quality Center, University of Wollongong, Technical Note No. 6, 2002.
[15]	C.-Y. Lee, “Effects of Unbalanced Voltage on the Operation Performance of a Three-Phase Induction Motor,” IEEE Transactions on Energy Conversion, Vol. 14, No. 2, 1999, pp. 202-208. http://dx.doi.org/10.1109/61.956770
[16]	A. I. Maswood, G. Joos, P. D. Ziogas and J. F. Lindsey, “Problems and Solutions Associated with the Operation of Phase-Controlled Rectifiers under Unbalanced Input Voltage Conditions,” IEEE Transactions on Industry Applications, Vol. 27, 1991, pp. 765-772. http://dx.doi.org/10.1109/28.85494
[17]	Benchmark Systems for Network Integration of Renewable Energy Resources, Version 7, CIGRE Task Force C6.04.02, 2011.
[18]	E. Muljadi, C. P. Butterfield, T. Batan and D. Yildirim, “Understanding the Unbalanced Voltage Problems in Wind Turbine Generation,” National Renewable Energy Laboratory (NREL), 1999.
[19]	J. Alonso-Martínez, J. Eloy-García and S. Arnaltes, “Control of a Three-Phase Grid Connected Inverter for Photovoltaic Applications with a Fuzzy MPPT under Unbalanced Conditions,” Proceedings on Power Electronics and Applications, 2009, pp. 1-7.
[20]	L. Fan, Z. Miao, and A. Domijan, “Impact of unbalanced grid conditions on PV systems,” IEEE power and energy society general meeting, 2010, pp. 1-6.
[21]	G. M. Bhutto, B. Bak-Jensen and P. Mahat, “Modeling of the CIGRE Low Voltage Test Distribution Network and the Development of Appropriate Controllers,” Transactions on Smart Grid and Clean Energy, Vol. 2, 2013, pp. 184-191.
[22]	D. Das, “Electrical Power System,” New Age International (P) Publisher, New Delhi, 2006.
[23]	Vector Group of Transformer, Electrical Notes & Articles. http://electricalnotes.wordpress.com/2012/05/23/vector-group-of-transformer.
[24]	W. H. Kersting, “Distribution System Modeling and Analysis”, CRC Press, New Mexico, 2002.
[25]	C. Hochgraf, R. H. Lasseter, “STATCOM Control for Operation with Unbalanced Voltages,” IEEE Transactions on Power Delivery, Vol. 13, 1998, pp. 538-544. http://dx.doi.org/10.1109/61.660926
[26]	Rekommandation 16, Spandingskvalitet I lavspandingsnet (voltage quality in low voltage Networks), 4. Udgave, 2011.