双馈型风电场多机等值建模方法

With the rapid development of wind power generation, the establishment of wind farm equivalent model with the same operation characteristics has become a key problem to be solved. In this paper, the wind farm is divided into four groups based on the active power output of the wind turbine. At the same time, the equivalent model of the collector network is proposed based on the invariance of the node injection current and power before and after the equivalence. The multi-machine equivalent modeling of the wind farm is realized, and the parameters of the equivalent machine are identified. Through the wind speed scene data of the actual DFIG-based wind farm, the detailed model, single-machine equivalent model and multi-machine equivalent model are established, and the dynamic responses of voltage, current, active power and reactive power at the outlet of the wind farm of different models are compared. The results show that the multi machine equivalent model proposed in this paper has high accuracy, and has good adaptability to the output scenario of wind farm and the degree of voltage sag at the outlet.