考虑多种故障场景的柔性互联低压配电网故障恢复方法

A Fault Recovery Method for Flexible Interconnected Low voltage Distribution Network Considering Multiple Fault Scenarios

针对多变压器柔性互联台区变压器N-1、N-2故障的场景,提出了多设备协调的故障恢复方法。首先,梳理了变压器N-1、N-2故障场景的特点和各场景下配电站内的母联开关和台区间互联的SOP协调的故障恢复流程;其次,考虑网络运行约束、故障恢复过程中设备能力约束等,建立了以负荷加权恢复量最大为目标的柔性互联配电网故障恢复模型,并将其转化为二阶锥求解;最后,在21节点+21节点柔性互联的典型低压配电网拓扑中验证了所提方法的效果,证明了其可以有效提升变压器故障后重要负荷保供电的能力。

A multi-device coordinated fault recovery method is proposed for the N-1 and N-2 fault scenarios of multi-transformer flexible interconnected transformer.Firstly,the characteristics of transformer N-1 and N-2 fault scenarios and the coordinated fault recovery process of bus coupling switch and SOP in distribution station under each scenario are sorted out;secondly,considering the constraints of network operation and equipment capacity in the process of fault recovery,a fault recovery model of flexible interconnected distribution network with the goal of maximizing load weighted recovery is established,and it is transformed into second-order cone solution;finally,the effectiveness of the proposed method is verified in a typical low-voltage distribution network topology with 21-node+21-node flexible interconnection,which proves that it can effectively improve the ability of important loads to guarantee power supply after transformer failure.