An Improved Islanding Detection Technique and priority based load shedding for distribution system with multiple DGs

The identification and operation of islands in the presence of Distributed Generation (DG) Units has become challenging. The non-detection of islanding could lead to a cascaded failure of the system. This paper proposed an Improved Islanding Detection Technique (IIDT) for early and accurate identification of the bus for islanding in the presence of multiple DG units. In the islands identified thus, a priority based load shedding scheme is proposed to alleviate the power mismatch with minimum amount of load shedding. The proposed schemes have been tested on standard IEEE 33 and 69 Bus test systems and the results obtained are promising.