Development and integration of adaptive underfrequency load shedding into the smart grid

The objective of underfrequency load shedding (UFLS) is to balance generation and load in case of a significant drop in frequency. Conventional UFLS schemes rely on parameters that are obtained by analyzing predefined scenarios that might not coincide with the actual emergency process. Improved UFLS scheme is presented in the paper that estimates accurate values of active power deficiency thus presenting an opportunity to enhance the efficiency and reliability of power system operation. The theory of the presented scheme is verified by computer modelling. Integration of the new UFLS scheme into the smart grid where it can be most effective by taking advantage of digital communication systems and smart meters is also discussed.