有源配电网故障后的供电恢复决策研究

Power service restoration decision making of active distribution network after fault is researched in the project. Through comprehensive utilization of reserve tie-lines and internal DG, the outage load can be rapidly restored and customer outage cost is reduced. So the intelligence and anti disaster capability of distribution power system is improved. Through the equivalence of tie-line to DG, the comprehensive restoration problem is simplified to a decision making problem only based on DG. And the division of generalized islands is carried out in order to pursue the best restoration plan. In decision-making process, the DG power characteristics is fully analyzed, and the combination of various types of DG and the control mode of each DG are both researched based on the master-slave control of each island. The sustainable and stable operation ability of each island is fully considered, and the sustainable and stable operation assessment index is proposed. The index is used as one of the optimization objectives, so the multi-objective mathematic model of the restoration problem is established. In view of the multi stage of the restoration and distribution of the power system, multi-agent technology is used to solve the problem. Through the project, the active distribution network reconfiguration and islanding problem after fault will be solved to maximize the recovery power load and the development of intelligent distribution network will be promoted.

本课题拟对有源配电网故障后的恢复供电决策展开研究，旨在发生故障后综合利用配电网的备用线路和内部DG，快速恢复停电负荷的供电，减少停电损失，提高配电网的抗灾能力与智能性。本课题提出通过对备用线路DG等值，将综合恢复供电问题统一为基于DG的恢复供电决策，然后对广义的孤岛进行划分，寻求最佳的恢复供电策略；在恢复决策过程中，在对各类DG功率特性充分分析的基础上，基于孤岛的主从控制方式，对各类DG进行优化组合，并优化选择DG的控制方式；所建立恢复方案充分考虑了各孤岛的可持续稳定运行能力，建立孤岛的可持续稳定运行评估指标体系；并将孤岛的可持续稳定裕度指标作为恢复供电决策的优化目标之一，构建有源配电网的多目标综合恢复供电模型；鉴于有源配电网的分布性，本课题采用了多代理系统对该问题进行求解。希望通过本课题的研究，有效解决有源配电网故障后的网络重构与孤岛划分问题，最大化恢复停电负荷，促进智能配电网的发展。

本课题对有源配电网故障后的恢复供电决策展开了研究，旨在发生故障后综合利用配电网的备用线路和内部DG，快速恢复停电负荷的供电，减少停电损失，提高配电网的抗灾能力与智能性。有源配电网发生故障后，综合利用备用联络线路与内部DG的孤岛运行能力为故障后的停电负荷综合恢复供电，可有效提高配电网的供电可靠性。针对此综合优化问题，本项目提出了DG孤岛运行静态稳定裕度水平的概念，建立了孤岛的稳定性与可持续性的评估方法与指标体系；建立了基于备用线路和DG 的综合供电恢复的有源配电网恢复供电的多目标数学模型；并通过将备用联络线路等值为DG的方式，有效简化了综合优化问题的复杂性，将有源配电网故障后网络重构与基于DG 孤岛划分进行了统一化处理。鉴于配电网的分布式结构及供电恢复决策的多阶段性，基于多代理技术构建了由协调层、决策层和设备层构成的多层分布式智能决策系统，并充分考虑了DG的类型及控制方式，基于孤岛的主从控制模式对恢复供电方案进行了优化计算。