考虑网络动态重构的配电系统两阶段灵活性提升优化调度方法

Two-stage Optimal Dispatching Method for Distribution System Flexibility Improvement Considering Dynamic Reconfiguration

随着大量可再生分布式电源接入配电系统,其出力多变性和不确定性的本质给配电系统的安全运行带来了严峻挑战。该文考虑网络动态重构的作用,研究提升配电系统灵活性的优化调度方法。首先,指出了净负荷的多变性和不确定性分别增加了系统的灵活性需求,分析了影响电源端灵活性供给的主要因素和网络动态重构对灵活性提升的作用机理。其次,综合考虑可再生能源的不确定性和可控电源的调节能力限制,将网络动态重构作为灵活性提升手段,以配电系统的综合运行成本为目标,构建了面向系统灵活性提升的两阶段鲁棒优化模型。其中第一阶段确定网络重构方案和灵活调度方案,第二阶段在灵活调度方案的基础上确定调整方案。该文利用列生成算法对该模型进行求解。最后,通过算例验证了文中模型的有效性和合理性。

With the integration of high penetration of renewable distributed generators, their variability and uncertainty have brought great challenges to the secure operation of distribution systems. To improve the flexibility of distribution systems, the optimal dispatching method considering dynamic reconfiguration is studied. Firstly, as the variability and uncertainty of the net load respectively increase the flexibility requirement of the system, the main factors affecting the flexibility supply of distribution systems and the mechanism of flexibility improvement through network reconfiguration are analyzed. Then considering the uncertainty of renewable distributed generators and the adjustment capability of controllable generators, a two-stage robust optimization model is proposed to improve the flexibility of distribution systems through dynamic reconfiguration, in which, the comprehensive operation cost of the distribution systems is minimized. In the proposed model, the network reconfiguration schemes and the flexible scheduling schemes are determined in the first step, and the flexible adjustment schemes based on the above scheduling schemes are determined in the second step. The proposed model is solved by the column-and-constraint generation algorithm and its validity and rationality are verified by an illustrative system.