Authors: P. Rohini Krishna Chaitanya, Dr. P Suresh Babu
Abstract: For potential distributed generation (DG) installed distribution system, a new protection scheme based on adaptive voltage relaying technique is proposed in this paper. The limited-area centralized wide-area protection system is utilized to store relevant line parameters, get the data of online voltage and current and facilitate communication among the Intelligent Electronic Device (IED)s. Based on this, a primary and backup protective relaying scheme with voltage adaptive feature are put forward according to the relationship between pre-and-post fault phase voltage difference and
corresponding phase current. The proposed method was simulated on a radial distributed system with DG installed using PSCAD/MATLAB under various operating conditions of the system and fault types and verified the immunity of the proposed method to the insertion and output variation of
DG. As an extension, it was compared with traditional low voltage protection; the proposed protective relaying the range of protection was extended to a considerable degree.
Keywords: Adaptive voltage protection, Intelligent Electronic Device (IED), distributed generation (DG), primary and backup protectiverelaying
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