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http://dx.doi.org/10.5762/KAIS.2020.21.4.39

Characteristics of Saturation and Circulating Current Based on Winding and Iron Core Structure of Grid-connected Transformer in Energy Storage System  

Tae, Dong-Hyun (Department of Electrical Engineering, Korea University of Technology and Education)
Lee, Hu-Dong (Department of Electrical Engineering, Korea University of Technology and Education)
Kim, Ji-Myung (Department of Electrical Engineering, Korea University of Technology and Education)
Rho, Dae-Seok (Department of Electrical Engineering, Korea University of Technology and Education)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.21, no.4, 2020 , pp. 39-48 More about this Journal
Abstract
Since the fire accident of ESS (energy storage system) occurred at Gochang KEPCO Power Testing Center in August 2017, 29 fire cases with significant property losses have occurred in Korea. Although the cause of fire accidents have not been identified precisely, it should be considered battery and PCS (power conditioning system) as well as unbalance issues in the distribution system. In particular, circulating currents in a neutral line of a grid-connected transformer, which can affect a magnetized current, may have a negative effect on the ESS with unintentional core saturation and surge voltages at the secondary side of the transformer. Therefore, this paper proposes the modeling of the distribution system, which was composed of a substation, grid-connected transformer, and customer loads using PSCAD/EMTDC S/W, to analyze the phenomena of circulating current and surge voltages of the transformer with unbalanced currents in the distribution system. This paper presents a countermeasure for a circulating current with the installation of NGR (neutral grounding resistor) in grid-connected transformer. From the simulation results, it is clear that exceeding the circulating current and surge voltage at the secondary side of the transformer can be one of the causes of fire accidents.
Keywords
ESS; Grid-Connected Transformer; Core Saturation; Surge Voltage; Circulating Current; PSCAD/EMTDC;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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1 Madhab Roy, Chinmay Kanti Roy, "A study on ferroresonance and its depedence on instant of switching angle of the source voltage", Third international conference on power systems, Kharagpur, pp. 1-6, India December 27-29, 2009 DOI: https://doi.org/10.1109/ICPWS.2009.5442704
2 S. M. Lee, Y. G. Sun, J. Y. Lee, D. G. Lee, E. I. Cho, D. H. Park, Y. B. Kim, I. S. Sim, J. Y. Kim, "Short-term Power Consumption Forecasting Based on IoT Power Meter with LSTM and GRU Deep Learning", The Journal of The Institute of Internet, Broadcasting and Communication, Vol. 19, No. 5, pp. 79-85, Oct. 2019. DOI: https://doi.org/10.7236/JIIBC.2019.19.5.79
3 Paul S. Moses, Mohammad A.S.Masoum, Hamid A. Toliyat, "Impacts of hysteresis and magnetic couplings on the stability domain of ferroresonance in asymmetric three-phase three-leg transformers", IEEE Transactions on energy conversion, vol.26, no.2, pp. 581-592, June 2011. DOI: https://doi.org/10.1109/TEC.2010.2088400   DOI
4 L. B. Crann, R. B. Flickinger, "Overvoltages on 14.4/24.9-Kv Rural Distribution Systems", Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems, Volume: 73, Issue: 2, Jan. 1954 DOI: https://doi.org/10.1109/AIEEPAS.1954.4498949
5 P. A. Abetti, I. B. Johnson, A. J. Schultz, "Surge Phenomena in Large Unit-Connected Steam Turbine Generators", Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems, Volume: 71, Issue: 5, Dec. 1952 DOI: https://doi.org/10.1109/AIEEPAS.1952.4498573
6 D. G. Lee, Y. G. Sun, I. S. Sim, Y. M. Hwang, J. Y. Kim, "Comparison of Power Consumption Prediction Scheme Based on Artificial Intelligence", The Journal of The Institute of Internet, Broadcasting and Communication, Vol. 19, No. 4, pp. 161-167, Aug. 2019. DOI: https://doi.org/10.7236/JIIBC.2019.19.4.161
7 R. H. Hopkinson, "Ferroresonant During Single-Phase Switching of 3-Phase Distribution Transformer Banks", IEEE Trans, on Power Apparatus and Systems, Vol. PAS-84, No. 4, pp. 289-293, April, 1965. DOI: https://doi.org/10.1109/TPAS.1965.4766193   DOI
8 "EMTDC manual," Winnipeg: Manitoba HVDC Research Center, 2003.
9 Jin-Geun Shon, Dong-joon Kim, Min-Gu Kang, Hee-Jong Jeon, "Magnetic Flux Saturation Analysis of Matching Transformer Considering Characteristic of Dynamic Voltage Restorer(DVR)", Trans., KIEE, vol.57P, no.3, pp. 236-243, SEP 2008. http://uci.or.kr/G704-001568.2008.57.3.012
10 M. Salimi, A. M. Gole, and R. P. Jayasinghe, "Improvement of Transformer Saturation Modeling for Electromagnetic Transient Programs," in International Conference on Power Systems Transients, 2013, pp. 16. http://ipstconf.org/papers/Proc_IPST2013/13IPST075
11 G.Morkyani, M.-R.Haghifam, "Analysis of ferroresonance in a 20kV distribution network", International conference on power electronics and intelligent transportation system, pp. 31-35, 2009. DOI: https://doi.org/10.1109/PEITS.2009.5407008
12 "ESS Causes Investigation and Safety Reinforcement Measures Announcement", Ministry of Trade, Industry and Energy, 2019.06. http://www.kats.go.kr/cwsboard/board.do?mode=download&bid=128&cid=20839&filename=20839_201906111437588581.pdf
13 "Establishing government measures to cope with ESS fire accidents", Ministry of Trade, Industry and Energy, 2019.06. http://kats.go.kr/cwsboard/board.do?mode=download&bid=128&cid=20485&filename=20485_201811281715340631.pdf