A Coordinated Control Method for Wind Farm-Energy Storage Joint Systems Participating in Frequency Regulation

With a substantial increase in wind power integration into the power grid, ensuring grid frequency stability faces significant challenges. This paper integrates the inherent frequency regulation mechanisms of wind power with energy storage technology to engage in power system frequency regulation. Through an analysis of the impact of wind power grid integration on power system frequency, the necessity of wind-storage joint participation in frequency regulation is elucidated, and a model for wind-storage joint system participation in power system frequency regulation is established. Furthermore, fuzzy control is employed for adjusting the virtual inertia response coefficient, with the energy storage system output controlled based on the state of charge (SOC) of the energy storage system. In the simulation process, analyses and comparisons are conducted between scenarios where wind power does not participate in frequency modulation (FM), wind power participates in FM under low wind speeds, and wind-storage jointly participates in FM under high wind speeds to validate the advantages of the wind-storage joint FM scheme. Additionally, comparisons are made between rotational speeds under fixed and variable coefficient scenarios, along with comparisons of load state and power supply, to verify the advantages of the wind-storage joint FM control strategy proposed in this paper.