Abstract: The integration of large scale wind power into the grid have increased operational uncertainty. In order to quantify the active power control capability of wind power and ensure stable system operation, a large scale wind power grids active power control system based on game weighting fuzzy evaluation is proposed. A quantitative evaluation index system is constructed to characterize safety, economy, and fairness according to active power control principles for wind power. For safety and stability, indicators including frequency deviation rate, voltage deviation rate, and cluster output fluctuation are defined to reflect power quality. For operational economy, indicators including wind farm curtailment rate, grid line loss rate, and thermal economy of thermal power plants are established. For balancing active power distribution, deviation indicators and comprehensive wind power capacity utilization are introduced. Finally, driven by data, the active power control capability of large scale wind power grids is evaluated using a game theory based subjective objective combination weighting method and a fuzzy evaluation method. Numerical examples demonstrate the effectiveness of the proposed method.