考虑三端智能软开关与孤岛划分结合的主动配电网故障恢复研究

Fault recovery strategy of active distribution network considering the coordination between islanding partition and three-terminal intelligent soft open point

配电网中接入分布式电源和智能软开关后,其形态和特征发生了明显的变化,并逐步演变为主动配电网。在故障恢复阶段,通过对失电区域进行孤岛划分提升配电网中负荷的恢复率,是提高主动配电网供电可靠性的重要环节之一。为此,提出一种三端智能软开关和孤岛划分相配合的主动配电网故障恢复方法。首先,建立基于分布式电源供电能力的时序孤岛划分模型,并考虑相邻孤岛的结合方案;然后,分析智能软开关的接入对主动配电网故障恢复和三端智能软开关不同接入位置的影响,通过二阶锥转化,将难以求解的非线性问题转化为标准二阶锥模型并求解;最后,以改进IEEE 33节点主动配电网算例进行分析,验证该文所提方法的有效性。

The integration of distributed generation and intelligent soft open points into the distribution network has led to significant changes in its form and characteristics,gradually evolving into an active distribution network.Improving the load recovery rate in the power outage area through island partitioning is a crucial aspect of enhancing the reliability of active distribution networks during the fault recovery stage.Therefore,a fault recovery method is proposed for active distribution networks,which combines three-terminal intelligent soft open points with island partitioning.Firstly,a time-series island partitioning model based on the power supply capacity of distributed generation is established,considering the combination scheme of adjacent islands.Then,the impact of the access of intelligent soft open points on the fault recovery of active distribution networks and the influence of different access positions of three-terminal intelligent soft open points are analyzed.Through second-order cone transformation,the nonlinear problem difficult to solve is converted into a standard second-order cone model and solved.Finally,an improved IEEE 33-node active distribution network is used for analysis to verify the effectiveness of the proposed method.