Abstract: The inertia and frequency regulation resources in high proportion of renewable energy power systems are scarce, resulting in prominent frequency stability issue. In response, this paper incorporates the potential frequency support capability of wind farms into the frequency control measures of the power grid, and proposes an optimization method for wind farm control parameters that considers the security requirements of system inertia. After the credible disturbance, based on the transient frequency index limit, calculate the system inertia security requirement that meets the frequency stability constraint at first. Then, model the primary frequency regulation capability that wind farms can provide under different wind conditions, with the goal of minimizing the adjustment of wind farm virtual inertia and frequency droop parameters under disturbances, and establish a dynamic optimization model for wind farm frequency control parameters; Finally, calculate the frequency control parameters and conduct numerical tests were conducted on the modified IEEE RTS-79 system, and the results showed that the proposed parameter optimization method effectively improved the transient frequency response process of wind farms, and helped to enhance the frequency stability margin of the system.

Key words: wind farm, frequency stability, inertia security requirement, virtual inertia, droop parameter