Research method for influence of doubly-fed wind turbine generator set on interconnected electric power system low frequency oscillation

The invention relates to a research method for the influence of a doubly-fed wind turbine generator set on interconnected electric power system low frequency oscillation. The research method comprises the steps of (1) simplifying regional systems into a simple interconnected system composed of two equivalent electric generators, dividing an electricity sending side and an electricity receiving side, and determining the low frequency characteristic of the interconnected system; (2) on the basis of two mass module shafting models, analyzing a transmission system model of the doubly-fed wind turbine generator set; (3) on the basis of the complete model of the doubly-fed wind turbine generator set, qualitatively analyzing the damping characteristic changing situation of the two regional interconnected systems before and after wind turbine generator set grid connection; (4) according to an overhead power transmission line, designing technical specifications, researching the influence of different wind electricity