考虑分布式电源支撑作用的输配电系统协同恢复方法

Coordinated restoration of transmission and distribution systems considering DG support

随着高密度分布式电源不断接入配电系统,配电系统向上支撑大电网恢复成为可能。首先,结合高密度分布式电源对电力系统分区并行恢复的促进作用,分析含分布式电源的大电网恢复分区需要满足的基本条件。然后,针对含高密度分布式电源的大电网待恢复子区,考虑相关运行约束等,构建输配电系统协同恢复的双层混合整数线性规划(MILP)模型。其中,上层输电系统恢复模型以最大化机组输出能量和负荷恢复为目标;下层配电系统恢复模型以最大化加权关键负荷恢复数目为目标。其次,提出考虑输、配电网调度中心协同的双层MILP模型解耦求解策略,解耦后模型可以分别在输、配电网调度中心利用成熟商业优化软件求解,从而实现含高密度分布式电源的输配电系统的协同恢复,提升恢复效果。最后,利用改进的IEEE 14节点输电测试系统和IEEE 13节点配电测试系统构建输配电系统算例,仿真验证所提方法的有效性。

With a considerable amount of DGs(Distributed Generations)integrating into distribution system,the power can transmit upward from distribution system to transmission system.Firstly,based on the promotion of high-density DGs to the regional parallel recovery of power system,the basic conditions for the regional recovery of large-scale power system with DGs are analyzed.Then considering related operational constraints,a bi-level MILP(Mixed-Integer Linear Programming)model for the coordinated restoration of transmission and distribution systems is proposed for large-scale power grids with high-density DGs.The upper transmission system restoration model aims to maximize the output energy and load recovery,while the lower distribution system restoration model aims to maximize the recovery number of weighted critical load.Then a two-layer MILP model decoupling solution strategy is proposed,which considers the cooperation between dispatching centers of the transmission and distribution networks.The decoupled models can be solved by commercial optimization software respectively in transmission and distribution dispatching centers,thus the coordination of transmission and distribution system restoration with high-density DGs is realized,and the restoration effect is improved.Finally,an example of transmission and distribution systems is constructed by using the improved IEEE 14-bus transmission test system and IEEE 13-bus distribution test system,and the effectiveness of the proposed method is verified by simulation.