Participation of DFIG based wind turbines in improving short term frequency regulation

The increasing penetration of variable speed wind turbines in Power grids results in reduction of the number of connected conventional power plants and system inertia consequently. This reduction affects frequency regulation of the grid. So new grid codes requires wind farms to participate in grid frequency regulation. This paper provides a new method to improve the contribution of DFIG based wind turbines in system frequency regulation. The method uses high kinetic energy stored in wind turbine and ability of DFIG to fast control of output power. This is done by introducing a supplementary loop to DFIG active power control loop. The effectiveness of the method is compared with other methods by simulation.