A method for evaluating robust power system security against uncertainties

Reliability of network operation is becoming an important problem due to increase in renewable energy (RE) generations. The system controllability is degenerating, while uncertainty due to RE is increasing and threatening the system security. We refer to the robustness of the system security against the uncertainty as “Robust Power System Security.” This paper proposes a new method to monitor the robust security region taking into account the conventional N-1 security criterion against uncertainties. Confidence interval (CI) of uncertain parameter is used to obtain the safe-side feasible regions of power sytem operations. We study a load dispatching problem using CI of RE prediction to evaluate the security region. Simulation results show that the proposed method is a promising approach to assess the degree of feasibility of system operation planning.