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Do Thanh Hieu, Nguyen Viet Ngu, Le Thi Minh Tam. AN IMPROVED SANDIA FREQUENCY SHIFT METHOD FOR ISLANDING DETECTION OF GRID CONNECTED PHOTOVOLTAIC INVERTERS. jst [Internet]. 2021Jan.6 [cited 2024Dec.27];28:36-2. Available from: http://jst.utehy.edu.vn/index.php/jst/article/view/405