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| Resilience Recovery Strategy for District-Tunnel Power Supply System Based on DC Line Interconnection |
| Kong Huiwen1,2, Ma Jing1, Cheng Peng2, Jia Limin2,3 |
1. State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China;
2. China Institute of Energy and Transportation Integrated Development North China Electric Power University Beijing 102206 China;
3. State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing 100044 China |
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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 0.11 h. 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 1.29 h. 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.
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Received: 26 May 2023
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2024, Vol. 39 
