提升分布式电源接纳能力的配电网三相鲁棒动态重构

不可控分布式电源(UDG)给主动配电网带来了显著的功率波动和不确定性。为消纳更多的UDG，主动配电网的拓扑结构应随系统的运行工况动态灵活配置。此外，由于配电系统的负荷通常是三相不平衡的，实际应用中也需要计及网络三相不平衡的重构模型。对此，基于自适应二阶段鲁棒优化方法，提出了一种三相不平衡配电网的动态重构方法。其中，第一阶段为在考虑的整个重构超前时段内优化网络的拓扑，以减少日常的开关费用并保持网络的辐射状结构。第二阶段为基于给定的网络拓扑和UDG出力不确定集合，通过执行三相动态最优潮流来最小化系统最坏情况下的运行成本。所提二阶段鲁棒动态重构模型可采用列与约束生成算法进行求解，并且线性三相潮流模型的采用，使主问题与子问题均可建模为混合整数线性规划问题。通过对修改的IEEE 34节点及IEEE 123节点系统的测试计算，验证了所提方法的有效性。

Three-phase Robust Dynamic Reconfiguration of Distribution Network to Improve Acceptance Ability of Distributed Generator

Uncontrollable distributed generators(UDGs)introduce significant power fluctuation and uncertainty to active distribution network(ADN). To absorb more UDGs, topology of ADN should be reconfigured dynamically with respect to the operation conditions. Moreover, since distribution systems are featured by load unbalance in phases, a three-phase unbalanced reconfiguration model is also desirable in practice. An adjustable two-stage robust optimization approach is proposed for the dynamic reconfiguration of a three-phase unbalanced ADN. In the first stage, the ADN topology is optimized for the entire look-ahead periods to minimize the daily switching cost and maintain the radial structure of the network. In the second stage, a three-phase dynamic optimal power flow is executed to minimize the worst operation cost based on the given network topology and the uncertainty set of UDG outputs. The two-stage robust dynamic reconfiguration model is solved by using column-and-constraint generation algorithm, where the main problem and sub-problems are both formulated as a mixed-integer linear program by applying a linear three-phase power flow model. Test results on modified IEEE 34 bus and IEEE 123 bus system verify the effectiveness of the proposed approach.