Robust transient stability assessment of renewable power grids

Abstract

Large scale renewable generation is increasingly installed into power grids all over the world in an effort to reduce CO2 from electricity sector. Yet, the inherent intermittent nature of renewable generations, such as wind and solar, introduces high uncertainty into system operation and may compromise the grid stability. As such, stability assessment of power grid with high penetration of renewables is an important issue. Due to the renewable generations uncertainty, the transient stability of renewable power grid can be assessed by simulating power systems dynamics with different level of renewable generations, which leads to highly computational cost. In this paper, we present a robust stability certificate that can rigorously guarantee the grids stability with respect to the variation in power injections. Interestingly, quadratic Lyapunov function approach is presented to transient stability assessment, offering real-time construction of stability certificates. The effectiveness of the proposed techniques is numerically illustrated on a number of IEEE test cases.