title: Smoothing effect for spatially distributed renewable resources and its impact on power grid robustness.
abstract: In this paper, we show that spatial correlation of renewable energy outputs greatly influences the robustness of the power grids against large fluctuations of the effective power. First, we evaluate the spatial correlation among renewable energy outputs. We find that the spatial correlation of renewable energy outputs depends on the locations, while the influence of the spatial correlation of renewable energy outputs on power grids is not well known. Thus, second, by employing the topology of the power grid in eastern Japan, we analyze the robustness of the power grid with spatial correlation of renewable energy outputs. The analysis is performed by using a realistic differential-algebraic equations model. The results show that the spatial correlation of the energy resources strongly degrades the robustness of the power grid. Our results suggest that we should consider the spatial correlation of the renewable energy outputs when estimating the stability of power grids.
authors.affiliation: Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan.
authors.forename: Motoki
authors.initials: M
authors.lastname: Nagata
authors.affiliation: Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan.
authors.forename: Yoshito
authors.initials: Y
authors.lastname: Hirata
authors.affiliation: Center for Spatial Information Science, The University of Tokyo, Chiba, Japan.
authors.forename: Naoya
authors.initials: N
authors.lastname: Fujiwara
authors.affiliation: Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan.
authors.forename: Gouhei
authors.initials: G
authors.lastname: Tanaka
authors.affiliation: Graduate School of Information Science and Technology, Osaka University, Osaka, Japan.
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Suzuki
authors.affiliation: Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan.
authors.forename: Kazuyuki
authors.identifier: 0000000246029816
authors.initials: K
authors.lastname: Aihara