Estimation Method for Key Frequency Regulation Parameters in “Double-High” Power Systems

With the large-scale integration of renewable energy into power grids, rapid estimation of key frequency regulation parameters after disturbances is critical for system planning and operation. This paper proposes an estimation method for key frequency regulation parameters in double-high power systems and clarifies the measurement signal requirements. Methods and procedures for rapid evaluation of the system-wide equivalent inertia time constant and speed regulation rate are established. Case studies with different penetration rates verify the method’s applicability in both traditional and double-high power systems. Simulation results show that the method accurately estimates key parameters: inertia monitoring errors are below 2%, and primary frequency regulation parameter errors are below 4.5%. The equivalent inertia time constant is obtained within 0.4 s after disturbance, while the speed regulation rate is derived after the system re-stabilizes. The method demonstrates strong adaptability in double-high power systems.