Abstract
The content of this paper aims to assist in the development and implementation of microgrids by addressing the challenges and possible solutions for their protection systems. Therefore, an overview of some protection methods available in the literature that can be implemented to ensure a safe and reliable microgrid operation is presented, including the most common protection devices and earthing schemes that can be adopted in low voltage distribution systems. In addition, this paper also presents a brief fault analysis of internal faults at three different locations in an industrial microgrid with centralized and decentralized deployment of energy sources, as well as a short-circuit analysis of symmetric and asymmetric faults at these faulty locations. An approximate method based on the calculation of the equivalent impedance seen from the fault location is used to determine the fault currents. This study is made to observe how microgrids with different configurations perform in the event of internal faults.
It is demonstrated in this work that setting a specific protection strategy to allow the microgrid to operate effectively during both operation modes can be problematic and expensive in most situations. With this in mind, additional effort is necessary to engineer and implement new protection approaches that can overcome the limitations of protection systems in future microgrids.
Acknowledgements
This work was partially supported by the Portuguese Foundation for Science and Technology (FCT) and by PIDDAC, under the research project INDuGRID, ERANETLAC/0006/2014 & ERANETLAC/0005/2014.
References
[1] Camacho A, Castilla M, Canziani F, Moreira C, Coelho P, Gomes M, et al. Performance comparison of grid-faulty control schemes for inverter-based industrial microgrids. MDPI, Energies J. 2017;10:2096. doi:10.3390. December 2017.10.3390/en10122096Search in Google Scholar
[2] Hatziargyriou N. Microgrids: architectures and Control. Indianapolis, IA: John Wiley & Sons Ltd, 2014Search in Google Scholar
[3] Kennedy J, Ciufo P, Agalgaonkar A. 2012. Intelligent load management in microgrids. in Proc IEEE Power and Energy Society General Meeting, Jul. 2012: 1–8.Search in Google Scholar
[4] Moslehi K, Kumar R. A reliability perspective of the smart grid. Proc IEEE Trans Smart Grid. 2010;1:57–64. Jun. 2010.10.1109/TSG.2010.2046346Search in Google Scholar
[5] Buigues G, Dysko A, Valverde V, Zamora I, Fernández E. 2013. Microgrid protection: technical challenges and existing techniques. in Proc International Conference on Renewable Energies And Power Quality (ICREPQ’13), Mar. 2013, no. 11.Search in Google Scholar
[6] Loix T, Wijnhoven T, Deconick G. 2009. Protection of microgrids with a high penetration of inverter-coupled energy sources. in Proc CIGRE/IEEE PES Joint Symposium, Jul. 2009: 1–6.Search in Google Scholar
[7] Malla SG, Bhende CN. Study of stand-alone microgrid under condition of faults on distribution line. Int J Emerging Electr Power Syst. 2014;15:501–12.10.1515/ijeeps-2013-0142Search in Google Scholar
[8] Dewadasa M, Ghosh A, Ledwich G. 2011. Protection of microgrids using differential relays. in Proc 21st Australasian Universities Power Engineering Conference, Sep. 2011: 1–6.Search in Google Scholar
[9] Hosseini SA, Abyaneh HA, Sadeghi HH, Razavi F, Nasiri A. An overview of microgrid protection methods and the factors involved. Renew Sustainable Energ Rev. 2016;64:174–86.10.1016/j.rser.2016.05.089Search in Google Scholar
[10] Shah AM, Bhalja B. A new adaptive differential protection scheme for tap changing power transformer. Int J Emerging Electr Power Syst. 2015;16:339–48.10.1515/ijeeps-2015-0005Search in Google Scholar
[11] Nikkhajoei H, Lasseter RH. 2007. Microgrid protection. in Proc IEEE PES General Meeting, Jun. 2007: 1–6.Search in Google Scholar
[12] Akila AA, Helal A, Eldesouki H. Protection of active distribution systems with DGs. Int J Emerging Electr Power Syst. 2015;16:399–412.10.1515/ijeeps-2015-0033Search in Google Scholar
[13] ABB Network Partner. 1998. “ANSI numbers - IEEE Standard Electric Power System Device Function Numbers acc. to IEEE C.37.2-1991.” Jul. 1998 (1MRB520165-Ben).Search in Google Scholar
[14] Patel UJ, Chothani NG, Bhatt PJ. Distance relaying with power swing detection based on voltage and reactive power sensitivity. Int J Emerging Electr Power Syst. 2016;17:27–38.10.1515/ijeeps-2015-0109Search in Google Scholar
[15] Jenkins N, Wu X, Jayawarna N, Zhang Y, Lopes JP., Moreira C., et al. Protection guidelines for a microgrid. CORDIS, 2005, 2006:1–370. http://microgrids.eu/micro2000/delivarables/Deliverable_DE2.pdf.Search in Google Scholar
[16] Al-Nasseri H, Redfern MA, Li F. A voltage based protection for micro-grids containing power electronic converters. Proc 2006 IEEE Power Eng Soc Gen Meet. 2006;2006:1–7.10.1109/PES.2006.1709423Search in Google Scholar
[17] Perera N, Rajapakse AD. Agent-based protection scheme for distribution networks with distributed generators. Proc 2006 IEEE Power Eng Soc Gen Meet. 2006;2006:1–6.10.1109/PES.2006.1709528Search in Google Scholar
[18] Dewadasa M, Ghosh A, Ledwich G. 2008. Distance protection solution for a converter controlled microgrid. in Proc 15th National Power Systems Conference, Dec. 2008: 1–661.Search in Google Scholar
[19] Oudalov A, Fidigatti A. Adaptive network protection in microgrids. Int J Distrib Energy Resour. 2009;2009:201–26.Search in Google Scholar
[20] Kar S, Samantaray SR Time-frequency transform-based differential scheme for microgrid protection. IET Gener Transm Distrib. 2014;8:310–20.10.1049/iet-gtd.2013.0180Search in Google Scholar
[21] Zarei SF, Parniani M. A comprehensive digital protection scheme for low-voltage microgrids with inverter-based and conventional distributed generations. IEEE Trans Power Deliv. 2017;32:441–52. Feb. 2017.10.1109/TPWRD.2016.2566264Search in Google Scholar
[22] Saleh KA, El-Saadany EF. Optimal protection coordination for microgrids considering N-1 contingency. IEEE Trans Ind Inform. 2017;13:2270–78. Oct. 2017.10.1109/TII.2017.2682101Search in Google Scholar
[23] Núñez-Mata O, Palma-Behnke R, Valencia F, Mendoza-Araya P, Jiménez-Estévez G. Adaptive protection system for microgrids based on a robust optimization strategy, MDPI. Energies J. 2018;11:308. doi:10.3390. February 2018.10.3390/en11020308Search in Google Scholar
[24] Monadi M, Gavriluta C, Luna A, Candela JI, Rodriguez P. Centralized protection strategy for medium voltage DC microgrids. IEEE Trans Power Deliv. 2017;32:430–40. Feb. 2017.10.1109/TPWRD.2016.2600278Search in Google Scholar
[25] Habib HF, Youssef T, Cintuglu MH, Mohammed OA. Multi-agent-based technique for fault location, isolation, and service restoration. IEEE Trans Power Deliv. 2017;53:1841–51. Jun. 2017.10.1109/IAS.2016.7731975Search in Google Scholar
[26] BoTong L, YongLi L, Tao M. 2011. Research on earthing schemes in LV microgrids. in Proc International Conference on Advanced Power System Automation and Protection, Oct. 2011: 1003–07.Search in Google Scholar
[27] Kamel RM, Chaouachi A, Nagasaka K. Comparison the performances of three earthing systems for micro-grid protection during the grid connected mode. Smart Grid Renew Energy. 2011;2:206–15.10.4236/sgre.2011.23024Search in Google Scholar
[28] Bandeiras F, Gomes M, Coelho P, Fernandes J, Camacho A, Castilla M. Microgrid architecture evaluation for small and medium size industries. Int J Emerging Electr Power Syst. 2018;19:1–12.10.1515/ijeeps-2017-0174Search in Google Scholar
[29] Boutsika TN, Papathanassiou SA. Short-circuit calculations in networks with distributed generation. Electr Power Syst Res. 2008;78:1181–91.10.1016/j.epsr.2007.10.003Search in Google Scholar
[30] ABB SACE. MV/LV transformer substations: theory and examples of short-circuit calculation. QT Tech Appl Pap. 2008;2:1–42. Feb. 2008.Search in Google Scholar
[31] Momeneh A, Castilla M, Ghahderijani MM, Camacho A, Vicuña LG. 2016. Design and control of a small-scale industrial microgrid in islanding mode. in Proc 42nd Annual Conference of the IEEE Industrial Elec-tronics Society, Oct. 2016: 72–77.10.1109/IECON.2016.7793490Search in Google Scholar
[32] Loix T, Wijnhoven T, Deconinck G. Protection of microgrids with a high penetration of inverter-coupled energy sources. integration of wide-scale renewable resources into the power delivery system. Proc CIGRE/IEEE PES Jt Symp. 2009;1:29–31. Jul. 2009.Search in Google Scholar
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