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Fault detection and mitigation in MVDC grids using a Non-Unit Voltage Ratio Derivative Algorithm

A. Blazquez(1), M.J. Pérez-Molina(2), P. Eguia(1), D.M. Larruskain(1), A. Iturregi(1), E. Torres(1)

1. Department of Electrical Engineering, Faculty of Engineering of Bilbao, Universidad del País Vasco UPV/EHU, Bilbao (Spain)

2. Oceanic Platform of the Canary Islands (PLOCAN), Telde, Spain

2026-01-20

Future MVDC grids will be used to reinforce thegrid infrastructure enhancing transmission capabilities, minimizing losses, and providing capability to compensate reactive power as well as to control load flows. This paper addresses the protection of MVDC grids, which is one of the main challenges to be overcome, before taking advantage of all the inherent benefits that this technology will bring. The main objective of this paper is to validate a non-unit voltage derivative fault detection algorithm in a MVDC grid with green hydrogen production. The performance is analyzed with different fault cases and fault locations. As a main conclusion, the distance is the most relevant factor, which affects detection and tripping times.

Key words: Algorithm, fault detection, fault mitigation, green hydrogen, non-unit, MVDC grid, voltage derivative.

[1] WG C6/B4.37 Cigre, Medium voltage DC distribution systems, Ref. 875, July 2022.

[2] ANGLE-DC, 2015 Electricity Network Innovation Competition, Ofgem. Available:
https://www.ofgem.gov.uk/ofgem-publications/97841/anglesubmission-pdf, accessed 14-02-2024.

[3] NR’s MVDC Solution, ±10kV JiangDong MVDC for optimizing distribution network. Available:
https://www.nrec.com/en/web/upload/2019/05/14/1557822630997rxt25.pdf, Accesed on 14-02-2024.

[4] L. Qu, et al., “Planning and analysis of the demonstration project of the MVDC distribution network in Zhuhai”, Frontiers in Energy, vol. 13, pp. 120-130, 2019.

[5] X. Wang, R. Chen, J. Ge, T. Cao, F. Wang and X. Mo, "Application of AC/DC Distribution Network Technology Based on Flexible Substation in Regional Energy Internet," 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia), Chengdu, China, 2019, pp. 4340-4345.

[6] C. Liang, J. Mengmeng, H. Qiang, Y. Xiaodong and L. Fei, "Engineering Simulation Analysis and Demonstration Application of Multi-terminal DC Distribution System," 2018 International Conference on Power System Technology (POWERCON), Guangzhou, 2018, pp. 2343-2349.

[7] A. Giannakis and D. Peftitsis, "MVDC Distribution Grids and Potential Applications: Future Trends and Protection Challenges," 2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe), Riga, Latvia, 2018, pp. 1-9.

[8] M.E. Baran, N.R. Mahajan, “Overcurrent Protection on Voltage-Source-Converter-Based Multiterminal DC Distribution Systems” IEEE Transactions on Power Delivery, Vol. 22, No. 1, 2007.

[9] C. Yuan, M.A. Haj-ahmed, M.S. Illindala, Protection “Strategies for Medium-Voltage Direct-Current Microgrid at a Remote Area Mine Site”, IEEE Transactions on Industry Applications, Vol. 51, No. 4, 2015.

[10] A. Kassem, H. Sabra, A.A. Ali1, K.M. Abdel-Latif, “Setting-Less Protection Technique for Mvdc Networks” Available: http://dx.doi.org/10.2139/ssrn.4446693, accessed 14-02-2024.

[11] Z. Dai, H. Zhu, H. Su, M. Huang, M. Ma, “DC Line Protection for Flexible MVDC Distribution Grid With Renewable Energy Resources”, IEEE Power & Energy Society General Meeting (PESGM), Portland, USA, 2018, pp. 1-6, doi: 10.1109/PESGM.2018.8586429.

[12] Y. Li, V. Mohan, S. Jiang, Y. Wang and J. Liang, "Wavelet Transform based Differential Protection for MVDC Distribution Network," 2022 57th International Universities Power Engineering Conference (UPEC), Istanbul, Turkey, 2022, pp. 1-6, doi: 10.1109/UPEC55022.2022.9917599.

[13] M.J. Pérez-Molina, P. Eguia, D.M. Larruskain, E. Torres, O. Abarrategi, J.C. Sarmiento-Vintimilla, “Single-ended limiting inductor voltage-ratio-derivative protection scheme for VSC-HVDC grids”, International Journal of Electrical Power & Energy Systems, Vol. 147, 2023, 108903.

[14] W. Leterme, N. Ahmed , J. Beerten, L. Ängquist , D. Van Hertem and S. Norrga, “A new HVDC grid test system for HVDC grid dynamics and protection studies in EMT-type software”, IET International Conference on AC and DC Power Transmission, Birmingham, UK, 10-12 february 2015.

[15] V. Psaras, D. Tzelepis, D. Vozikis, G.P. Adam and G. Burt, “Non-Unit Protection for HVDC Grids: An Analytical Approach for Wavelet Transform-Based Schemes”, IEEE Transaction on Power Delivery, Vol. 36, N. 5, October 2021.

[16] D.M. Larruskain, P. Eguia, A. Iturregi, E. Torres, V. Valverde and A. Blazquez, “Protection of DC grids with renewable energy sources and electrolyzers for green hydrogen production” ICREPQ’23, Madrid 2023.