A reliable transportation system is essential for the development of a community. Especially in urban transportation, rail transportation is a faster, more comfortable way to travel for the commuters. These benefits can be valued further when the rail transportation system is with zero emissions. Electric trains can be considered a zero-emission transportation method. However, a rail transportation system operates with net-zero emissions when electricity is generated from zero-emission-based sources. Photovoltaic systems have already been integrated into railway stations and spare land owned by railways to achieve net-zero emissions. Furthermore, medium-voltage DC network and microgrid concepts have been proposed to incorporate more renewable energy sources into railway electrification systems. However, the energy generated from those systems is not enough to realise net-zero emissions, as the power requirements of an urban railway electrification system are high. Accordingly, this article investigates the possibility of implementing a photovoltaic system along the railway tracks to meet the energy demands of an urban railway electrification system so that net-zero emissions can be achieved. Other significant advantages of the proposed photovoltaic system are lower feeder losses due to distributed photovoltaic systems integrated into the railway electrification system, lower conversion losses due to the direct integration of the photovoltaic system into the railway electrification system, and the nonrequirement of additional space to install the photovoltaic system. In this paper, a photovoltaic system capacity sizing algorithm is proposed and presented by considering a railway electrification system, the daily schedule of trains, and historical photovoltaic weather data. This proposed photovoltaic system capacity sizing algorithm was evaluated considering a section of the urban railway network of Sri Lanka and a three-year, 2017-2020, photovoltaic weather data. The results indicated that the potential for photovoltaic generation by installing photovoltaic systems along a railway track is much higher than the requirement, and it is possible to meet the required train scheduling options with proper sizing. Furthermore, in the three-year analysis, it is possible to achieve 90% of the energy required for the railway electrification system with effective train scheduling methods.

中文翻译：

---

面向净零排放的城市铁路沿线光伏系统选型算法

可靠的交通系统对于社区的发展至关重要。尤其是在城市交通中，轨道交通是通勤者更快捷、更舒适的出行方式。当轨道交通系统实现零排放时，这些好处可以得到进一步重视。电动火车可以被认为是一种零排放的运输方式。然而，当电力从基于零排放的来源产生时，轨道交通系统以净零排放运行。光伏系统已经集成到火车站和铁路拥有的备用土地中，以实现净零排放。此外，已提出中压直流网络和微电网概念，以将更多可再生能源纳入铁路电气化系统。然而，这些系统产生的能量不足以实现净零排放，因为城市铁路电气化系统的电力需求很高。因此，本文探讨了在铁路轨道沿线实施光伏系统以满足城市铁路电气化系统能源需求的可能性，从而实现净零排放。所提议的光伏系统的其他显着优点是由于分布式光伏系统集成到铁路电气化系统中而降低馈线损耗，由于光伏系统直接集成到铁路电气化系统中而降低了转换损耗，以及不需要额外的安装空间光伏系统。在本文中，通过考虑铁路电气化系统、列车每日时刻表和历史光伏天气数据，提出并提出了光伏系统容量调整算法。考虑到斯里兰卡的一段城市铁路网和 2017-2020 年三年的光伏天气数据，对提出的光伏系统容量调整算法进行了评估。结果表明，通过沿铁路轨道安装光伏系统进行光伏发电的潜力远高于要求，并且可以通过适当的规模满足所需的列车调度选项。此外，在三年的分析中，通过有效的列车调度方法，可以实现铁路电气化系统所需能源的90%。