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Due to the increasing load demand, the operating state of modern powersystems are become closing to their critical levels. Moreover, the modern powersystems are integrated with a large amount of fast-response dynamic elements,so the short-term voltage stability (STVS) issues should be taken seriously. Inorder to improve the STVS of power systems, we can optimize the dynamic VARreserve under contingency set. However, the scale of actual power grids isusually large, so it is hard to solve the overall optimization problemdirectly. To reduce the difficulty of solving the problem, a practicalgrid-partitioning method considering the dynamic VAR response of power gridunder contingency set is proposed in this paper, to decompose the overallproblem into several sub-problems. The buses in each region are similar interms of voltage response to dynamic VARs and contingencies. The effectivenessof the proposed method is verified based on a region power grid model of China.

A Practical Grid-Partitioning Method Considering the Dynamic VAR Response of Power Grid under Contingency Set