Research On Relationship Between High-order Frequency Response Model And Temporal And Spatial Distribution Of Wide-area Power System

Due to the large-scale interconnection and high structural complexity of China’s power grids,the wide-area measurement of power grid frequency data has shown an apparent dynamic temporal and spatial distribution of frequency at each measurement point.In recent years,a dual-high power system with high penetration of renewable energy and power electronic equipment has gradually formed,making the frequency dynamic process of the wide-area grid more complicated.However,the traditional frequency response theory does not consider the temporal and spatial dynamic characteristics of the frequency,so the precise analysis and control of the power grid’s frequency need to be studied in depth.Based on the above analysis,this paper focuses on studying the frequency response and temporal-spatial distribution model of the wide-area power system.First,this paper proposes a high-order frequency response model of the power system.The model bases on the traditional simplified frequency response(System Frequency Response,SFR)model.This paper will expand the mechanical gain to the first-order inertia link,increasing the excitation system damping and load effect damping.Also,this paper establishes a more refined high-order SFR model.Besides,this paper also studies the tuning method of model parameters to improve the prediction accuracy.Secondly,this paper studies the relationship between the system inertia distribution and the temporal and spatial frequency dynamics.This paper analyzes the frequency dynamic response mechanism of the wide-area system and clarifies the temporal and spatial distribution of frequency’s critical influencing factors.Also,this paper proposes a uniform distribution of generator inertia based on the shortest electrical distance path,combines with the system inertia distribution and structural parameters of grids,defines the temporal and spatial frequency of discrimination factor,and constructs a temporal and spatial frequency dynamic sequence discrimination method.Thirdly,this paper studies the coupling relationship between the high-order SFR model and temporal and spatial of frequency distribution.This paper analyzes the quantitative output response of each parameter of the frequency response model,screens out the key coupling parameters of the temporal and spatial of the frequency distribution of the wide-area system,and introduces the temporal and spatial of frequency distribution factor to study the frequency dynamic mapping relationship between the inertial center and the measurement points of the wide-area system.Based on the mapping relationship,this paper constructs a model of temporal and spatial frequency distribution.Finally,this paper verifies the feasibility and accuracy of the high-order SFR model proposed above.In this paper,the IEEE 9-node example analysis verifies that the model can accurately predict the frequency dynamics of a system after a disturbance in a multi-computer interconnected system.Besides,this paper verifies the accuracy of the temporal and spatial distribution of the frequency of each measuring point predicted by the model of a temporal and spatial of frequency distribution of a wide-area system through the IEEE 39-node example.The research results of this paper have important theoretical significance and application value for the safe and stable operation and frequency control of wide-area power systems.