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

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