An Optimal Integrated Approach Considering Distribution System Reconfiguration and Protection Coordination

  • Dima Imad Kayyali

Student thesis: Master's Thesis


Power distribution system is the final stage of the electric power system, where energy is delivered to the end users. Typically, the design of power distribution systems targets efficiency at peak load demand. The recent focus of research in power systems is aiming toward improving the efficiency throughout all the system operation cycle. A major research area is the distribution system reconfiguration (DSR). In general, DSR aims to increase the efficiency of distribution systems, where the target is to, usually, minimize the active power loss of the system via optimally reconfiguring the power system lines. However, DSR studies generally neglect the consequences that arise when changing the network topology. A major aspect is the protection coordination system. The protection coordination that is initially built, based on the original power system configuration, may not be valid for the reconfigured system. This thesis presents an integrated approach that simultaneously considers protection coordination in a DSR framework. The proposed protection scheme is based on directional overcurrent relays (DOCRs). The DSR problem is formulated as a mixed integer non-linear programming (MINLP) problem to determine the optimal system configuration, while the protection coordination problem is modeled as a non-linear programming (NLP) problem to determine the optimal DOCR settings. The methodology is tested on the 33-bus and the 119-bus radial distribution systems, considering various scenarios of load growth as well as different penetration levels of distributed generation (DG). The results show that the proposed protection coordination scheme is capable of en¬¬suring proper protection coordination for the reconfigurable distribution systems.
Date of AwardMay 2014
Original languageAmerican English
SupervisorHatem Zein El din (Supervisor)


  • Power Distribution System; Distributed Generation (DG); Machine Design; Production Engineering.

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