计及供电-供水系统耦合关系的配电网故障恢复优化决策方法

Optimization Decision-Making Method for Distribution System Restoration Considering the Interdependency Between Power and Water Distribution Systems

在大停电事故后,协同利用本地分布式电源为关键负荷恢复供电是提升配电网韧性的有效措施。供电系统与供水系统是城市中2种具有密切耦合关系的生命线设施,若在制定恢复策略时对上述耦合关系考虑不足,会影响生命线设施的正常运转。首先挖掘了极端事件下配电网与配水网的耦合关系,在此基础上,以最大化电、水关键负荷恢复数目为目标,考虑配电网、配水网及耦合元件的运行特点,建立了计及供电-供水系统耦合关系的配电网故障恢复优化决策模型,并利用多种线性化方法将模型近似为混合整数线性规划(mixed-integer linear programming,MILP)模型;最后,构建算例进行对比验证,结果证明该方法可以恢复更多电网和水网关键负荷,实现有限发电资源的最优分配。

When an outage event occurs,coordinating local distributed generators to restore critical loads is an effective way to enhance the resilience of the power distribution system (PDS). PDS and water distribution system (WDS) are two kinds of lifeline infrastructures with interdependency in a city. If we establish the restoration strategy without enough consideration of the interdependency between the two systems,the lifeline infrastructures may not work properly. This paper analyzes the interdependency between PDS and WDS firstly. On this basis,authors formulate the distribution system restoration method considering the interdependency between PDS and WDS as a mixed-integer linear program (MILP)through several linear approximation methods. The objective function is maximizing the number of restored critical loads,and the operational characteristic of PDS,WDS,and the interdependent components are taken into account. The method is tested in an integrated power and water system. The result shows that the proposed method can restore more critical loads and make the allocation of limited generation resources optimally.