基于直流线路互联的区-隧供电系统弹性恢复策略

doi:10.19595/j.cnki.1000-6753.tces.230769

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摘要

“双碳目标下”,以服务区光伏车棚、光伏隧道为代表的能源交通融合供电场景逐步普及,这使得形态开放且布局分散的区-隧供电系统在面临极端灾害或人为攻击时更为脆弱。对此,本文提出了一种基于直流线路互联的区-隧供电系统弹性恢复策略。基于灾害前对直流线路的改造与韧性加固计划,本文首先提出了基于直流线路被优先遍历的可行拓扑搜索策略,用于保障所提系统在极端灾害后的有效互联。其次,基于对故障负荷重要级权重的多层级分类策略,本文先后以重要负荷恢复量最大化和系统额外损耗最小化为目标构建了故障恢复目标函数,共同保证极端灾害发生后系统基于稀缺分布式能源的最大弹性恢复。再次,基于传统二阶锥松弛方法可能挣脱原始约束的缺陷,提出通过约束额外损耗中流经电流分量实现对混合整数二阶锥规划问题的收敛,确保所提模型在不同初始条件下的稳定适用。最后,涵盖区-隧供电系统的改进IEEE123节点配电网验证了所提策略的有效性。

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关键词 ：区-隧供电系统, 直流线路互联, 深度优先遍历, 弹性恢复

Abstract：

To realize the goal of energy transition, it has become a future trend to fully develop the available space resources of highways and build a clean energy power supply system. Considering the limitations of a single power supply system and the intermittency of power generation, district-tunnel power supply (DTPS) systems that include multiple service areas or tunnel power supply systems have higher reliability. However, due to the dual threats of transportation and energy systems, as well as the dual fluctuations of distributed generation and traffic load electricity consumption, the proposed regional tunnel power supply system has a higher risk when facing extreme natural disasters and human attacks. Experts and scholars have conducted research on the resilience of multi-area systems. However, existing recovery strategies are all implemented under radial constraints, which often leads to the waste of scarce distributed resources. To address these issues, this paper proposes an elastic recovery strategy based on DC line interconnection.
First, based on the pre-disaster DC line renovation and reinforcement plan, a deep priority traversal strategy for DC lines is proposed to ensure effective interconnection of the system in extreme events. Second, based on multi-level classification strategy, a two-stage fault recovery objective function is constructed to ensure the recovery index of the power system based on scarce distributed energy after extreme disasters, including priority recovery of important loads and minimization of additional losses. In addition, based on the traditional second-order cone relaxation method, a convergence strategy for solving mixed integer second-order cone programming problems is proposed, which can overcome the limitations of original constraints and ensure the stable use of the proposed model under different initial conditions. Final, the improved IEEE 123-node power supply system covering DTPS system scenarios verified the stable applicability of the proposed strategy.
The verification results indicate that although the total power output of the system under a single power supply topology is limited, compared with traditional recovery strategies, the proposed strategy can still improve the elasticity index by 30.91% and shorten the recovery time by 0.11h. In a multi power topology, the proposed recovery strategy can recover loads with higher weight factors and ensure the maximum utilization of scarce distributed energy, thereby increasing the system elasticity index by 40.09% and shortening the recovery time by 1.29h. In addition, compared to traditional recovery strategies where sudden changes may lead to an increase or decrease in the recovery index, the proposed strategy always ensures a stable and high recovery index.
In summary, the following conclusions can be drawn: (1) Compared to traditional fault recovery strategies, the topology structure based on DC line interconnection can effectively improve the feasible solution space of the system, and reduce the installation cost of the system through targeted reinforcement plans. (2) The proposed fault recovery strategy is significantly superior to traditional strategies in terms of recovery index and recovery time. (3) The proposed resilience recovery strategy remains stable under different initial conditions and can be extended to hybrid AC/DC microgrids.

Key words： District-tunnel power supply system DC line interconnection depth-first traverse resilience recovery

收稿日期: 2023-05-26

PACS:

TM619

基金资助:

国家重点研发计划资助项目（2021YFB1600202）

通讯作者: 马静男,1981年生,教授,博士生导师,研究方向为电力系统分析、稳定与控制等。E-mail：hdmajing@163.com

作者简介: 孔惠文女,1994年生,博士研究生,研究方向为新能源电力系统的分析、稳定与控制,综合交通与能源系统等。E-mail：hwkong@ncepu.edu.cn

引用本文:

孔惠文, 马静, 程鹏, 贾利民. 基于直流线路互联的区-隧供电系统弹性恢复策略[J]. 电工技术学报, 0, (): 230769-230769. Kong Huiwen, Ma Jing, Cheng Peng, Jia Limin. Resilience Recovery Strategy for District-Tunnel Power Supply System Based on DC Line Interconnection. Transactions of China Electrotechnical Society, 0, (): 230769-230769.

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