Quantifying the photovoltaic potential of highways in China. (15th October 2022)

• Record Type: Journal Article
• Authors: Zhang, Kai; Chen, Min; Yang, Yue; Zhong, Teng; Zhu, Rui; Zhang, Fan; Qian, Zhen; Lü, Guonian; Yan, Jinyue
• Is Part Of: Applied energy. Volume 324(2022)
• Publication Date: 2022-10-15
• Subjects: Photovoltaic highway -- Hillshade -- Carbon neutrality -- Intelligent transportation; Power (Mechanics) -- Periodicals; Energy conservation -- Periodicals; Energy conversion -- Periodicals; 621.042
• DOI: 10.1016/j.apenergy.2022.119600
• Languages: English
• ISSNs: 0306-2619

Abstract

Highlights: A spatiotemporal model to estimate the photovoltaic (PV) potential of highways is developed. The dynamic shadows of the surrounding terrain on the highway surface are considered. By 2020, the mileage of Chinese highway was 143, 684 km and the area was 3, 957 km 2 . The installed capacity and power generation of PV highways in China are 700.85 GW and 629.06 TWh, respectively. Abstract: Installing photovoltaic (PV) modules on highways is considered a promising way to support carbon neutrality in China. However, collecting the area of the highway, and precisely assessing the shadow area of the highway under complex terrain remain challenges. That severely hinders the assessment of highway PV potential. To address these challenges, a spatiotemporal model is developed in this study to estimate the annual solar PV potential on highways over the whole Chinese territory. First, the areas of different highway segments are calculated based on highway network and highway toll stations. Second, hourly shadow area on highways created by nearby terrain is estimated based on a digital elevation model (DEM). When calculating the highway PV potential, the solar irradiation received in these shadow areas is regarded as zero. Finally, the PV potential of all lanes and emergency lanes was estimated at the prefecture-level city scale using surface radiation data and radiation assessment models. Based on the highway data with a total mileage of 143, 684 km at the end of 2020, the results show that the annual PV potential is 3, 932 TW and that the corresponding installed capacity is 700.85 GW, which can generate clean electricity at a rate of up to 629.06 TWh. The annual PV potential of highways in the southeast is greater than that in the northwest owing to the higher highway density in the southeast. This study provides a reference basis for highway PV construction planning and suitably assessment in each region of China for PV highway development.