Abstract：With the continuous development of China's power industry and the rapid increase in the penetration rate of new energy，while meeting the daily load demand，the scale of the power grid has gradually expanded，making it very difficult to construct a complete frequency response model of complex power systems. Aiming at the problem that the excessive parameters in complex power grids make it difficult to establish a system equivalent frequency response model，a system boundary division method based on the propagation characteristics of electromechanical disturbances was proposed. The propagation characteristics of electromechanical disturbances

were analyzed in the continuum model. Starting from the critical frequency threshold of electromechanical

disturbance propagation and the response time of generators，hierarchical clustering was performed on the

composite electromechanical distances of generators affected by disturbances to determine the degree of close

connection between different generators，and a boundary division method for complex power grids was determined to simplify the complexity and calculation scale of system frequency response（SPR）analysis. Finally，taking the IEEE 10-machine 39-bus system as a calculation example，three different typical disturbances were set in Matlab/Simulink simulations to verify the effectiveness and adaptability of the proposed system boundary division method under different disturbance scenarios.

        Key words：electromechanical disturbance；dynamic equivalence；system boundary division；hierarchical

clustering；parameter aggregation；system frequency response（SFR）

     Format Citation:李世春，李卓霖，石明达,等. 机电扰动传播特性的电力系统边界划分频率响应建模[J].电气传动,2026,56(09):35-45. LI Shichun，LI Zhuolin，SHI Mingda,et al. Frequency response modeling for power system boundary division considering electromechanical disturbance propagation characteristics [J].Electric Drive, 2026,56(09): 35-45