Abstract
Recently, a great attention has been paid in applying Distributed Generation (DG) throughout electric distribution systems. Although DG has many advantages and benefits, it has to be applied after performing detailed investigations due to their complexities in operation, control and protection of network. One of the most considerable problems that arise, when DGs are used, is destructing efficiency and qualification of the existing protection system. The injected currents of DGs to a distribution network lead to not having a radial network anymore, and consequently network faces an inefficient protection system that was formerly designed according to the existing philosophy behind the distribution network. In this paper, a new protection scheme has been presented to provide the distribution networks including DGs. The new approach, designed based on capabilities of Distribution Automation System (DAS), has been implemented using a computer-based relay which is installed in the sub-transmission substation. The proposed scheme has been implemented on some part of a real distribution network in Shiraz which is a large city in Iran and performance of the proposed scheme is tested on it. For simulating the distribution network and for implementing the relay algorithm, DIgSILENT Power Factory 13.2 and MATLAB are used respectively.
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