Abstract
The uncertain nature of wind energy is an issue for the smooth operation of grid connected wind farms. Grid operations have to satisfy the stipulated grid codes for frequency control. In this chapter, grid networks made up of steam and hydro turbines are connected to three wind farms, using different control topologies. The first wind farm consists of only fixed-speed induction generator wind turbines. The second wind farm is composed of only variable-speed doubly fed induction generator (DFIG) wind turbines. A flywheel-based DFIG system is used in the third wind farm. The reference power of the DFIG in the third wind farm is controlled in such a way as to smooth its output during dynamics periods, while at the same time generate excess kinetic energy in the flywheel that is injected into the system to improve its performance. A comparative study was carried out on the dynamic performance of the grid networks, considering the same wind speed conditions for the three schemes used in the wind farms. The coordinated control scheme in the third wind farm enhances the frequency response and other variables of the power system. Simulations were carried out using Power System Computer Design and Electromagnetic Transient Including DC.
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