Abstract
The equivalent model of modern power system is more and more difficult to describe its complex stability characteristics, with the continuous promotion of power conversion. This paper proposes an improved equivalent method to consider the voltage deviation between the system side and the load side. On this basis, the voltage stability margin index is derived. Therefore, the relationship between voltage stability margin and reactive power compensation can be analyzed. Finally, the correctness and effectiveness of the method are verified by IEEE39 node system and actual provincial grid. The proposed method can obviously improve the voltage stability margin when applied to the small summer mode of the actual system. (The stability margin of the weakest node increased by 12.8%, and the average stability margin of the whole network increased by 1.5%.)
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