Study on the Boundary Conditions for the Construction of Railroad Photovoltaic Systems in Xizang

Zhao Xinyu

doi:10.3969/j.issn.1004-3403.2025.07.009

Abstract：Though the power infrastructure in Xizang is weak,the photovoltaic resources there are extremely favor-able,adopting photovoltaic power generation for railroads can not only alleviate the pressure on the power grid,but also create economic benefits.However,the harsh local environment has increased the cost of construction and oper-ation,so this paper launches a systematic study on the investment boundary conditions of railroad photovoltaic proj-ects in Xizang.Based on comprehensive consideration of factors such as photovoltaic resources and land cost,ground-based photovoltaic systems at 25°inclination angle were selected as the object,the power generation capaci-ty was measured,market conditions and policy requirements were summarized to conduct analysis with suitable boundary conditions.The study shows that the payback period is linearly and positively correlated with the unit in-vestment cost.The lower the photovoltaic resources get,the worse the consumption capacity becomes,and when the surplus power cannot be fed into the grid,the more sensitive the revenue gets to the unit cost.The lower the con-sumption rate reaches,the more the payback period increases with each further reduction,especially when the unit investment costgets high,the photovoltaic resources become low or the surplus power cannot be fed into the grid.Whether the surplus power can be fed into the grid has a huge impact on the payback period due to tax incentives and curtailment loss.The higher the unit cost reaches,the lower the photovoltaic resources and consumption rate get,and the more obvious the revenue gap becomes.These results can provide scientific reference for investment de-cision makers and promote the smooth development of railroad photovoltaic projects in Xizang.