考虑调整变化量和变步长的暂态稳定约束最优潮流模型

Transient Stability Constrained Optimal Power Flow Model Considering Power Adjustments and Variable Step Size

为了满足电网事故后运行方式的快速调整需求,本文提出了一种新的暂态稳定约束最优潮流(TSCOPF)模型,以系统调整变化量最小为目标,并采用了区分故障中和故障切除后两阶段的积分步长微调策略。该模型的系统调整变化量与系统失稳程度密切相关,解决了传统TSCOPF调整量过大的问题。两阶段积分步长微调策略使得刚好整数步时到达故障切除时刻和仿真结束时刻,实现了关键时间节点的准确仿真。采用了原始-对偶内点法求解该模型。IEEE-9、NE-39及IEEE-118 3个测试系统的计算结果表明,所提方法利于调度员快速处理事故,提高了TSCOPF的实用化水平。

In order to meet the rapid adjustment needs of power grid operation after accidents, a new model of transient stability constrained optimal power flow （TSCOPF） is established. The model is to achieve the objective of minimum power adjustment. Furthermore, variable step strategy is adopted to adjust the steps of before and after clearing fault separately. The objective of the model is closely related to the degree of system instability. It solves the problem that the power adjustment of the traditional TSCOPF is too large. To ensure that the fault cleaning time and simulation end time can be simulated accurately, the two stages of the variable step strategy makes the numerical method reach the key time with integer steps. Primal-dual interior point method is used to solve the problem. Numerical simulations on the three test systems, IEEE-9, NE-39 and IEEE-118, have shown that the proposed method is helpful for dispatchers to deal with accidents quickly which improves the practical level of TSCOPF.