Abstract: [Objectives]　As the proportion of renewable energy in new-type power systems continues to increase,these systems are increasingly exhibiting low-inertia characteristics, making frequency stability problems increasingly severe. The advanced adiabatic compressed air energy storage (AA-CAES) system is characterized by high efficiency, rapid response, and excellent frequency regulation capabilities. However, traditional PID control strategies have slow response and struggle to meet the system’s requirements for efficient frequency regulation. Therefore, to enhance the primary frequency regulation performance of AA-CAES systems, a primary frequency regulation control strategy based on a linear quadratic regulator (LQR) is proposed. [Methods]　This study constructs a primary frequency regulation model of the AA-CAES system considering the dynamic characteristics of each component. LQR is introduced to design an output power control strategy for the AA-CAES based on the system’s state of charge (SOC). The discharging process of the AA-CAES is optimized based on its actual output power under different SOC conditions. Finally, the effectiveness of the proposed strategy is validated using the MATLAB/Simulink simulation platform. [Results]　The strategy demonstrates optimal frequency regulation performance when the system is in a fully charged state.

Key words: renewable energy, new-type power system, energy storage, primary frequency regulation, linear quadratic regulator, state of charge