Abstract

The offshore wind farm is close to the load center, and its development scale is getting larger and larger. In order to study the dynamic characteristics of wind farms, it is obviously impractical to take detailed wind farm model as research object. In this paper, on the principle of keeping the external characteristics of the wind farm unchanged, an aggregation study of the wind farm taking into account the submarine cable capacitance effect is given. In addition, the aggregation method of the internal parameters of the wind turbine generators (WTGs) and the collector system are given. Finally, a detailed wind farm model with 34 squirrel-cage induction generator (SCIG) WTGs and the corresponding aggregated model are established on PSCAD simulation software. The dynamic characteristics of the two models at the point of common coupling (PCC) under grid fault condition are simulated and compared. The results show that the proposed dynamic aggregation method can present the dynamic characteristics of wind farm with high accuracy, and can be popularized for other types of wind farm.

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