• Assist. Prof. Dr. Inaam I. ALI Electrical Engineering Department, University of Technology, Baghdad,Iraq.
  • Mohanad Sh. Tarad AL-AASAM Electrical Engineering Department, University of Technology, Baghdad,Iraq
Keywords: Short circuit current, Controlled Islanding, New Splitting strategies, Station Busbar of Highest Short Circuit Level


Preliminary studies on Iraqi power system show a significant increase in the short circuit level at some of the grid substations and some power stations. This increasing results from the growth of the power generation and transmission systems in size and complexity. Islanding or splitting is dividing the power system into several islands inorder to reduce short circuit levels and avoiding blackouts. The main islanding problem is determining the location of proper splitting points and load balance and satisfaction of transmission capacity constraints for each islands.
This paper mainly introduces new proposed splitting strategies of large-scale power systems by using (PSS™E version 30.3 PACKAGE PROGRAME), such that, make re-interconnection of 400KV super high voltage substation based on three-phase load flow to be minimum flow at splitting point and infeed fault current details method to control short circuit levels in Iraq power system without islanding the power system into isolated islands. Controlled islanding or splitting scheme is frequently considered as the final solution to avoid blackouts of power system.
Simulation IEEE-25 bus and Iraqi power system used as the test systems for this method. Furthermore, simulation results show significant effectiveness on reducing short circuit levels with same time give stable splitting islands with same frequency for preventing the system blackouts.


T. Roininen, C. E. Solver, H. Nordli, A. Bosma, P. Jons- son and A. Alfredsson, “ABB Live Tank Circuit Breakers, Application Guide.” Publication 1HSM 9543 23-02en, Edition 1.2, 02- 2013.

Heresh Seyedi and Barzan Tabei,"Appropriate Placement of Fault Current Limiting Reactors in Different HV Substation Arrangements ", Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran. Accepted May 14, 2012 Published Online July 2012 .

S. Pahwa, M. Youssef, P. Schumm, C. Scoglio, N. Schulz," Optimal intentional Islanding to Enhance the Robustness of Power Grid Networks", Physical, A: Statistical (2013) Mechanics and its Applications, 392(17), 3741-3754.Copyright: © 2013 Elsevier B.V. Digital Object Identifier (DOI): doi: 10.1016/j.physa.2013.03.029.

Kai Sun, Da-Zhong Zheng and Qiang Lu, "Splitting Strategies for Islanding Operation of Large-Scale Power Systems Using OBDD-Based Methods". Vol. 18, NO. 2, May 2003.

Guangyue Xu and Vijay Vittal, "Slow coherency based cutset determination algorithm for large power systems". Vol. 25, No. 2, May 2010.

David H.Meyer, Thomas Rusnov and Alison Silverstein, “Final Report on the August14,2003 Blackout in the United States and Canada: Causes and Recommendations” U.S.-Canada Power System Outage Task Force, April 5th, 2004.

Pablo Fernández Porras, Jairo Quirós Tortós."Controlled Islanding with Special Consideration of Parallel Power System Restoration Constraints". Electric Power & Energy Research Laboratory. School of Electrical Engineering, University of Costa Rica, San Jose, Costa Rica. Ingeniería 27 (1): 113-131, ISSN: 2215-2652; 2017.

P. A. Trodden, W. A. Bukhsh, A. Grothey, and K. I. M. McKinnon, "Optimization-based Islanding of Power Networks using Piecewise Linear AC Power Flow", IEEE TRANSACTIONS ON POWER SYSTEMS,Vol.29, No. 3,MAY 2014 25October 2013.

C. W. Taylor and D. C. Erickson. “Recording and analyzing the July 2 cascading outage [Western USA power system]”. IEEE Computer Application Power, vol. 10, pp. 26–30, Jan. 1997.

Qianchuan Zhao, Kai Sun, Da-Zhong Zheng, Jin Ma and Qiang Lu, "A Study of System Splitting Strategies for Island Operation of Power System: A Two-Phase Method Based on OBDDs", IEEE Transactions on power systems, VOL.18, No.4, November 2003.

J. H. Chow. "Time-Scale Modeling of Dynamic Network with Applications to Power Systems". New York: Springer-Verlag, 1982, Vol. 46, Lecture Notes in Control and Information Sciences.

H. You, V. Vittal, and X. Wang, "Slow coherency-based islanding”. IEEE Transactions on Power Systems, Vol. 19, no. 1, pp. 483–491,2004.

R.Baldick, B. Chowdhury, I. Dobson, D. Zhaoyang and G. Bei, D. Hawkins, “Initial review of methods for cascading failure analysis in electric power transmission systems” . Proceedings of the IEEE PES General Meeting, Pittsburgh, PA, USA, Jul, 2008.

M. M. Adibi, R. J. Kafka, Sandeep Maram and Lamine M. Mili, "On Power System Controlled Separation", IEEE Transaction on power systems, VOL. 21, NO. 4, NOVEMBER 2006.

P. A. Trodden, W. A. Bukhsh, A. Grothey and K. I. M.McKinnon, " MILP formulation for controlled islanding of power networks. International Journal of Electrical Power and Energy Systems ", School of Mathematics, University of Edinburgh James Clerk Maxwell Building, Edinburgh EH9 3JZ, Scotland. (2013), 45 (1). 501 - 508. ISSN 0142-0615, (2013).

A. J. Phillips, J. M. Senior, R. Mercinelli , M. Valvo , P. J. Vetter, C. M. Martin, M. O. van Deventer, P. Vaes, and X. Z. Qiu, "Redundancy Strategies for a High Splitting Optically Amplified Passive Optical Network.", JOURNAL OF LIGHTWAVE. TECHNOLOGY, Vol.19, NO.2, February 2001.

Kai Sun, " Prevention and Mitigation of Cascading Outages in Power Grids Using Synchrophasor-based Wide-Area Measurements", Stanford University. Electric Power Research Institute, Inc, 8May, 2012.

J. B. V. Subrahmanyam and C. Radhakrishna, " Distributed Generator Placement and Sizing in Unbalanced Radial Distribution System". World Academy of S

How to Cite
ALI, A. P. D. I., & AL-AASAM, M. (2019). REDUCING SHORT CIRCUIT LEVELS BY USING SYSTEM SPLITTING STRATEGIES. Al-Qadisiyah Journal for Engineering Sciences, 11(3), 309-331.