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Short Circuit Capacity: A Key to Design Reliable Protection Scheme for Power System with Distributed Generation

Sunny Katyara 1, Lukasz Staszewski 2, Hyder A. Musavi 3, and Farhan Soomro 4
1. Department of Electrical Engineering, Sukkur Institute of Business Administration Pakistan
2. Department of Electrical Engineering, Wroclaw University of Science and Technology, Poland
3. Faculty of Engineering, Science and Technology, Indus University Karachi, Pakistan
4. Department of Electrical Engineering, Usman Institute of Technology Karachi, Pakistan

Abstract—With the emerging issues about the ecological pollution and potential energy deficiency, many efforts are taken to initiate the renewable energy plans, established primarily with wind energy, solar panels and low capacity water power plants etc. These forms of power production are called Distributed Generation (DG), as they are installed near the load centers. Power utilities all over the world are welcoming DGs to increase their generation capacity. With the aim to cut electricity bills, DGs are brought into power networks in order to meet the increased load demands especially during peak hours. It is expected that in the future, more and more DGs will be taken into system. Therefore, with the increased number of DGs, the fault level issue becomes more complex. The interconnection of DG introduces somehow protection problems such as islanding, relay settings and increase of short circuit capacity. In this research, the influence of DG interconnection over the short circuit capacity in the radial distribution network was analyzed and the effective protection scheme for distribution network was proposed then. The effective method for setting the optimal Coordination Time Intervals (CTI) between the transformer and the feeder relays in real distribution systems was also discussed. A protection scheme based on over-current techniques was proposed for synchronous DGs, connected to utility feeder operating in grid-coupled mode, in order to make the most of DG benefits to customers. The proposed solutions were verified with MATLAB software simulations.
Index Terms—Distributed Generators (DGs), network configuration, power loss, relay settings, Short Circuit Capacity (SCC)

Cite: Sunny Katyara, Lukasz Staszewski, Hyder A. Musavi, and Farhan Soomro, "Short Circuit Capacity: A Key to Design Reliable Protection Scheme for Power System with Distributed Generation," International Journal of Mechanical Engineering and Robotics Research, Vol. 6, No. 2, pp. 126-133, March 2017. DOI: 10.18178/ijmerr.6.2.126-133