A Cosine Similarity-Based Centralized Protection Scheme for dc Microgrids

Unlike the phasor measurement-based protection in ac systems, of dc systems deals with complex fault transients which mandate isolation faulted segment within few milliseconds as continued current leads to overheating issue power electronic converters. To this end, several works have been suggested-based on unit and nonunit protections for microgrids. Threshold selection coordination are challenges associated protection. Similarly, communication delay link failure limit application address these issues, article presents a robust centralized scheme microgrids, is resilient failure. It uses each line compute similarity change at both ends derive decision. overcome from one end or even multiple segments, proposed method data adjacent segments decision correctly. Using computer aided design (PSCAD)/electromagnetic direct (EMTDC) environment, performance evaluated various cases compared available techniques. Finally, accuracy algorithm validated under experimental conditions.