Variable Droop Control for Wind Farm to Participate the System Frequency Regulation

Abstract

This paper presents an adaptive frequency response control scheme for the large scale wind farm, which enables wind farm to participate the grid frequency regulation. The main advantage of this scheme is that, by adjusting the droop coefficient of each wind generator in response to its local wind speed, this scheme takes into account the wind speed difference among wind generators. Specifically, the droop coefficient of each wind generator is dynamically adjusted inversely proportionally to the local power margin, which is computed using the local wind speed. This way, the wind farm frequency support power is distributed among multiple wind generators in an adaptive and reasonable fashion. As a result, not only the wind farm frequency support performance is improved, but also the wind generator stability is ensured. Simulation results on the data collected from a real wind farm validate the effects of the proposed control scheme.