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Comparison of New LVRT Compatible MV Network Short-Circuit Protection Schemes

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Traditionally short-circuit protection operation time delays in medium-voltage (MV) networks have been dependent on magnitude of fault-current or impedance with fixed time delays or inverse time curves without consideration of protection selectivity issues with distributed generation (DG) units’ low-voltage-ride-through (LVRT) curves and possibility of intended island operation. In the future, these issues need to be considered increasingly in MV network protection specifications. In this paper two new future-proof directional short-circuit protection schemes are compared and evaluated. Both schemes enable, without use of high-speed communication, the definition of grid code LVRT curve compatible voltage dependent protection operation time delays during grid connected operation for intelligent electronic devices (IEDs) in MV distribution network which consists of multiple protection zones.
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Protection; Smart Grids; Grid Code; Network Code; Interconnection Requirements; Low-Voltage-Ride-Through; Fault-Ride-Through; Islanding; Distributed Generation; Distribution Network

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Z. Jiang, J. Fan, J. Mcdonald, Advanced Distribution Automation Management for Active Distribution Systems, CIGRE Session 2012, 26-30 August 2012, Paris, France.

H. Laaksonen, D. Ishchenko, A. Oudalov, Adaptive Protection and Microgrid Control Design for Hailuoto Island, IEEE Transactions on Smart Grid, vol. 5, May 2014, pp. 1486 – 1493.

F. Coffele, M. Dolan, C. Booth, G. Ault, G. Burt, Coordination of Protection and Active Network Management for Smart Distribution Networks, CIRED Workshop 2012, May 29-30 2012, Lisbon, Portugal.

Laaksonen, H., Kauhaniemi, K., Voima, S., DG unit fault behavior and protection of LV microgrid, (2010) International Review on Modelling and Simulations (IREMOS), 3 (3), pp. 353-367.

H. Laaksonen, Protection Principles for Future Microgrids, IEEE Transactions on Power Electronics, vol. 25, December 2010, pp. 2910 – 2918.

Laaksonen, H., Enhanced multi-criteria-based passive islanding detection scheme, (2014) International Review of Electrical Engineering (IREE), 9 (6), pp. 1162-1170.

Laaksonen, H., New passive islanding detection method based on cumulative sum of change in voltage positive sequence phase angle, (2013) International Review on Modelling and Simulations (IREMOS), 6 (5), pp. 1482-1488.

Laaksonen, H., Islanding detection method without non-detection zone based on usage of single parameter (ISDET) calculated from voltages, (2013) International Review on Modelling and Simulations (IREMOS), 6 (6), pp. 1771-1779.

CIGRE (Joint Working Group B5/C6.26/CIRED), Protection of Distribution Systems with Distributed Energy Resources, Final Report, 2014.

ENTSO-E, ENTSO-E Network Code for Requirements for Grid Connection Applicable to all Generators (NC RfG), March 2013. [Online]. Available:

CENELEC, CLC/TS 50549-2 Requirements for generating plants to be connected in parallel with distribution networks - Part 2: Connection to a MV distribution system, Final Version, January 2015.

BDEW, Technical Guideline - Generating Plants Connected to the Medium-Voltage Network, 2008, Germany. [Online]. Available:$file/BDEW_RL_EA-am-MS-Netz_engl.pdf

Technical standard CEI 0-16, Technical conditions for electricity distribution grid connection with a nominal voltage of greater than 1 kV, December 2012, Italy.

Laaksonen, H., Securing passive islanding detection and enabling stable islanding with Q/f -droop control of DG unit, (2014) International Review of Electrical Engineering (IREE), 9 (3), pp. 592-602.

V. Gabrion, F. Colas, L. Karsenti, Risk of Stabilisation of Islanding Situations by Local Regulations, CIRED 2014 Workshop, 11-12 June, 2014, Rome, Italy.

Laaksonen, H., Future-Proof MV Distribution Network Short-Circuit Protection Scheme, (2015) International Review of Electrical Engineering (IREE), 10 (1), pp. 98-108.


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