Interval power flow calculation with improved scenario optimization method considering correlation of variables

The uncertainty of renewable energy output and load fluctuation increases the uncertainty of power system operation state, for which, a nonlinear optimization method of interval power flow scenario considering the correlation of interval variables is proposed. The correlation of interval variables is represented by constructing uncertain parallelogram area. Aiming at the problem of repeated calculation caused by scenario optimization method, the state variables with the same trend are classified and calculated by comparing the positive and negative sensitivity of node voltage to node power. The results of example analysis show that the proposed method can accurately calculate the interval boundary, effectively reduce the optimization times and improve the calculation efficiency. © 2022, Electric Power Automation Equipment Press. All right reserved.