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Tunnel Energy Supply Strategy and Practice with Grid-Connected PV-Storage Microgrid: A Case Study of the Wudingguan Tunnel Photovoltaic Power Station Project
(1.Hanzhong Highway Bureau, Hanzhong 723012; 2. Shaanxi Provincial Key Laboratory of Highway Bridges and Tunnels, Xi′an 710064; 3. Xi′an Chang′an University Engineering Design and Research Institute Co., Ltd., Xi′an 710064)
Abstract Mountain highway tunnels consume substantial energy during operation. Utilizing clean energy sources like photovoltaic (PV) power to partially or fully meet tunnel energy demands represents a crucial approach to alleviate traditional energy shortages and achieve carbon neutrality goals. Based on the Wudingguan Tunnel PV power station project, this study establishes a comprehensive design and evaluation framework for highway tunnel PV energy supply systems, incorporating tunnel energy consumption analysis, solar resource assessment, PV-storage system design,and operational performance evaluation. The research provides specific design methodologies for highway tunnel PV stations and analyzes long-term monitoring data to reveal intrinsic relationships between PV power generation and weather/seasonal variations. Key findings include: (1) The Wudingguan PV station achieves an annual output of 9 ×105 kW·h, fully covering non-ventilation electricity demands (3.8 × 105 kW·h); (2) PV power generation shows strong weather dependence, with clear days yielding maximum daily average output (3 472.8 kW·h) and snowy days producing minimal output (less than 1/40 of that in clear days); (3) Grid-connected PV microgrid in Wudingguan tunnel effectively mitigates typical PV limitations like instability and low utilization efficiency ("junk electricity"characteristics).
Abstract：
Mountain highway tunnels consume substantial energy during operation. Utilizing clean energy sources like photovoltaic (PV) power to partially or fully meet tunnel energy demands represents a crucial approach to alleviate traditional energy shortages and achieve carbon neutrality goals. Based on the Wudingguan Tunnel PV power station project, this study establishes a comprehensive design and evaluation framework for highway tunnel PV energy supply systems, incorporating tunnel energy consumption analysis, solar resource assessment, PV-storage system design,and operational performance evaluation. The research provides specific design methodologies for highway tunnel PV stations and analyzes long-term monitoring data to reveal intrinsic relationships between PV power generation and weather/seasonal variations. Key findings include: (1) The Wudingguan PV station achieves an annual output of 9 ×105 kW·h, fully covering non-ventilation electricity demands (3.8 × 105 kW·h); (2) PV power generation shows strong weather dependence, with clear days yielding maximum daily average output (3 472.8 kW·h) and snowy days producing minimal output (less than 1/40 of that in clear days); (3) Grid-connected PV microgrid in Wudingguan tunnel effectively mitigates typical PV limitations like instability and low utilization efficiency ("junk electricity"characteristics).
LI Qiang1 HAN Xingbo2 XIE Ju1 LI Chao3 LI Xing3 MA Aihua1 BI Jiefu3 YE Fei
.Tunnel Energy Supply Strategy and Practice with Grid-Connected PV-Storage Microgrid: A Case Study of the Wudingguan Tunnel Photovoltaic Power Station Project[J] MODERN TUNNELLING TECHNOLOGY, 2025,V62(3): 60-66
2025, Vol. 62 