With a rapid increase in the installed capacities of wind power in recent years,the interaction between power angle instability and voltage instability in the transient process of the power system has become more complex.Based on different system models,the paper explores the impact of wind power integration on the migration of the oscillation center,indicating that as the capacity of wind power connected to the grid increases,the system's oscillation center will migrate away from the wind power access position,that is,towards the load side;it is proven that the coupling of voltage and power angle stability is most obvious when the center of oscillation is closer to the load side.Through the calculation of coupling indexes,a quantitative assessment of the degree of coupling instability caused by wind power access is conducted further.Finally,the correctness of this conclusion is verified through simulations in a two-machine single-load system and a real system in Sichuan Province.
关键词
风电/振荡中心迁移/暂态稳定/耦合机理
Key words
wind power/migration of oscillation center/transient stability/coupling mechanism
维普
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