0.2 −0.1 0 τ J J normalized frequency frequency response FJ{ ψ J } FJ{ ψ J }FDI 1 Fig. 10. Test case 4: Frequency response of F J { ψ J } with and without undetectable FDI attack. For the attacked case, F J { ψ J } FDI , the threshold τ J J is exceeded.

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This paper proposes a classification scheme for the different types of flexibilities that are used in electric grids. This classification scheme, which is called a taxonomy, helps to convey the meaning of different concepts of flexibility in research and industrial projects. It also allows to compare the sources and uses of flexibility in conventional vs. smart grid situations to highlight the evolving nature of the power system.