Steady-state Security Region Boundary Modification Model: A Hybrid Physical Model-Driven and Data -Driven Approach

A calculation approach for power system thermal security region in power injection space was presented. The thermal security region is an important tool to analyze and evaluate the impact of random changes in power growth direction on the thermal stability of power systems. Based on the DC power flow model, the high dimensional surface of the steady-state security region boundary can be approximately replaced by a hyperplane. However, with the expansion of the system scale, the error of the analytic model will have a greater impact on the boundary of the security region. Therefore, this paper proposes a steady-state security region boundary modification model based on the hybrid physical model-driven and data -driven method. The proposed boundary modification model can retain the useful inherent information from the physical model and utilize the ability of data analysis to extract the inexplicit linear error model. A more accurate boundary will improve the efficiency of power system operation and the economy- of power system. It is verified on several IEEE standard test systems, and the results show that it has high accuracy.