Analysis of the influence of power system structure on the Central China Grid’s small- signal stability

A study of low frequency inter-area oscillation which appears during the process of the interconnection of power grids is presented in this paper. The eigenvalue sensitivity with respect to inter-area transfer admittance is suggested to analyze the extent of the power gridspsila tightness, and to manifest the influence of the power grid connection mode on the power system stability, which shows that as the deterioration of the power gridspsila interconnection tightness, the damping ratio of the low frequency inter-area oscillation gets smaller and the frequency of the inter-area oscillation gets lower. An example of Central China Grid is studied to verify the validity of the theoretical analysis, and a different power system structure is suggested to enhance the damping of the low frequency oscillation.