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Abstract: In this paper, a method for improving the performance of the network protection system in the presence of DGs by use of intelligent devices is proposed. The method, which is implemented on a hierarchical multi-agent structure, can improve the coordination problems between overcurrent relays by using a telecommunications platform based on the IEC-61850 standard information model. By this way, the protection scheme is implemented on three levels on the relays. Each level has tasks that are implemented on a layered multi-agent structure, depending on the layout of the network under certain conditions. At the first protection level performed by relay agents, the relay protection characteristic curve is used along with the functions defined on the intelligent devices. At the second level, a database is used to record the events and the pattern of behavior chosen according to them in order to prevent the flow of information on the network and to speed up the performance of the protection system. Functional patterns recorded in the database allow agents to obtain appropriate settings without sending information to the central unit if similar conditions occur. At the third protection level, in the absence of a similar pattern, the new relay settings are calculated according to the network conditions and transmitted to the network monitoring unit. Finally, in order to verify and validate the proposed method, the proposed scheme is simulated on an experimental network in the ETAP software.

Keywords: Distribution network, distributed generation resources, hierarchical protection scheme, IEC-61850 standard

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