A Method for Evaluation of Transmission Section Steady-state Security Region Considering Multiple Faults and Maintenance Mode of Power Grid

In recent years, with the increasingly growth of power grid scale and its load, the requirements for security and stability of the power grid and reliability of power supply are gradually improved. In this paper, the superposition principle of power flow transfer in component state space considering multiple faults and maintenance mode of power grid is proved based on that the characteristic of the power flow transfer after N-1 contingency is approximate linearity. According to user-defined set of transmission sections and set of faults and maintenance states, a mathematical model based on state superposition algorithm to calculate steady-state security region of transmission section is proposed. The correctness of the model and the validity of the solution are verified by the actual example of Hubei power grid.