| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 102 === Generally to achieve better protection in power system more than one relays are used. This thesis presents two cases. Case 1 is the implementation of distance protection in distribution system with directional overcurrent relay to make protection system more reliable and to coordinate both relays in mesh distribution systems. To get the optimal relay setting in relays coordination the optimization technique is used. The proposed optimization algorithm of optimization in this thesis is Linear Programming-Bat Algorithm (LP-BA). In the previous research, some researchers have proposed the coordination relay using Linear Programming-Particle Swarm Optimization (LP-PSO) to get the optimal solution. Based on the simulation result, the proposed optimization algorithm using LP-BA can get better result than LP-PSO, because LP-BA can produce the minimum total time for all relays setting in the distribution system. Case 2 is considering the distribution system when it is connected to the Distributed Generator (DG) penetration. However, the integration of DG into power distribution networks has great affects to the coordination of relay setting. Because the fault current will change depend on the capacity and location of the DG penetration. By using Protection Coordination Index (PCI) the best location for connecting DG and the maximum capacity of DG in the network system can be determined without changing the relays setting that have been produced in the Case 1.
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