Abstract
The high penetration wind power will count towards a significant portion of future power grid. This significant role requires wind turbine generator (WTG) to contribute to primary frequency regulation support. Consequently, it is necessary to investigate the dynamic frequency response of wind farms. In this paper, an aggregated frequency response model for wind farms participating in primary frequency regulation is developed and validated. Firstly, the low-order frequency response model of wind power (WPFR) with combined frequency control is deduced by employing small signal analysis theory. Afterwards, a weighted averaging method is proposed for aggregating the multi-machine WPFR model with heterogeneous parameters into a single equivalent model, which is called an aggregated WPFR (AWPFR) model. Such an aggregation model can provide a convenient way to describe the dynamic response and steady-state response of wind farm. Finally, the accuracy and effectiveness of the aggregated frequency response mode is verified through comparisons of the simulation results obtained from multi-machine WPFR model and detailed wind farm model.
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