Abstract
Under frequency load shedding (ULFS) schemes are devised to help power system maintain the load-generation balance by shedding adequate loads to match the generation. In this paper, a new centralized adaptive load shedding scheme is proposed in three stages. The first stage determines the requirements needed for implementation of the proposed scheme. The optimal amount and location of load drops and post load shedding strategies are specified in the second stage. In addition to consideration of operational limitations and voltage stability criteria, this stage takes the interruption cost of dropped loads into account. In the third stage, the event type is determined in real time and the pre-specified optimal load shedding scheme and post load shedding strategies associated with the event are implemented. The proposed methodology is successfully testified in the IEEE 39-bus system through several case studies.
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