Abstract

This paper investigates sub-synchronous resonance (SSR) phenomena inside a doubly-fed induction generator (DFIG) based wind farm, considering the impact of the spatial distribution of wind speed. Firstly, the impedance model of a one-DFIG aggregated model based wind farm is presented to analyze the induction generator effect. Then, a two-DFIGs aggregated impedance model, considering DFIGs in both low wind speed and high wind speed is developed to analyze the influence of wind speed spatially distribution on SSR in a wind farm. The number of DFIGs under different wind speeds, which represented to the wind speed spatially distribution, will influence the SSR. When there are more DFIGs in low wind speed, SSR will occur simultaneously in all DFIGs in a wind farm; while there are more DFIGs in high wind speed, SSR will be damped for all DFIGs. Analysis based on the impendence models and the simulation tests are given.

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