Margin Factor-Based Frequency Coordination Control Strategy for Multi-Wind Farms

With the rapid development of high proportions of renewable energy and power electronic equipment, these new features have posed severe challenges to the safe and stable operation of modern power systems. To enhance the connection performance between systems with a high proportion of power electronic equipment and the grid, this paper proposes a frequency coordination control method based on margin factors. Firstly, this paper discusses the power distribution problem for the primary frequency regulation among multiple wind farms. After comprehensively considering factors such as the operating conditions of the wind farms (such as rotor speed and converter capacity), the equal proportion margin factor allocation method is used to send the power command to each wind farm. Secondly, for the setting of the virtual inertia and virtual damping coefficients of each wind farm, a method based on releasing kinetic energy to adjust the frequency regulation parameters is studied. According to the trend of the frequency response, the states of the wind farms are classified, and on this basis, the frequency regulation parameters are set by combining the available frequency regulation kinetic energy. Finally, simulations are conducted to verify the accuracy and effectiveness of the proposed method. The results of these simulations indicate that this method can reasonably utilize the frequency regulation resources of each wind farm, effectively improve the frequency stability of power systems characterized by a large number of power electronic devices, and ensure the frequency safety of modern power systems.