考虑变量相关性的改进场景优化法区间潮流计算

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

可再生能源出力和负荷波动的不确定性增加了电力系统运行状态的不确定性,为此提出一种考虑区间变量间相关性的区间潮流场景非线性优化方法。通过构造不确定平行四边形区域表示区间变量间的相关性,针对场景优化法可能造成重复计算的问题,通过对比节点电压对节点功率的灵敏度的正、负性,将变化趋势一致的状态变量进行归类计算。算例分析结果表明,所提方法能够准确计算区间边界,有效削减优化次数以及提高计算效率。

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.