The stability limit of power transmission from Shaanbei Grid to Guanzhong Grid is analyzed based on the Shaanxi Grid structure in 2006,the results show that the power delivery capacity from Shaanbei to Guanzhong Grid is restricted by the stability limit of transmission sections.

Stability limit of synchronous electric machine matches with the exciting current If and armature current IM in the stability limit area of V-curve,traditionally,there are two methods to solute the stability limit: drawing potential vector and field exploring.

To investigate the rationality of the load model currently used by Fujian power grid, the stability limits of Fushuang lines are calculated for different network structure and nodal load models of Fuzhou power network as index of Fujian power grid s transient stability level, and factors influencing load characteristics and system stability are analyzed.

Analysis on factors influencing transient stability limits of long-distance transmission profile;

The ground behavior regularity of caving method coal face on “soft seam with soft surounding”and extremely unstable seam and the optimization of support patterns;

We define two concepts about the best polar point and stable polar point, then discuss the equivalent relationship among the best polar point, stable polar point and least simple estimate under the non-degenerate model.