电气化铁路沿线光伏分布式并网方案及其电气特性研究

doi:10.19595/j.cnki.1000-6753.tces.241814

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Abstract

With the rapid development of electrified railways (ERs), the traction power demand has increased sharply. In 2023, the National Railway Group's electricity consumption for traction reached 97.423 billion kWh. However, ERs rely heavily on high-carbon energy sources, leading to significant carbon emissions. Thus, achieving low-carbon energy consumption for ERs is crucial.
ERs are extensively distributed, and their infrastructure, such as embankment slopes and station canopies, offers vast potential for photovoltaic (PV) development. Additionally, the energy demand for traction aligns well with PV generation, providing excellent capacity for PV energy absorption. By fully utilizing the PV potential of infrastructure along railway lines and integrating distributed PV generation systems, ERs can significantly reduce their carbon emissions.
To achieve low-carbon and green power supply for ERs, as well as to efficiently absorb power from the PVs along railway lines, this paper proposes distributed PV integration scheme based on the traction network. First, considering the narrow and dispersed nature of PV along railway lines, a grid connection topology for distributed PVs is proposed. This topology incorporates the structure of the railway traction power supply system and the local infrastructure conditions, selecting traction substations, AT stations, and section posts as PV integration points. Next, an energy flow coupling model is established for the system, comprising "PVs (Source) - Utility Grid (Source) - Inverter (Grid) - Traction Network (Grid) - Electric Trains (Train)." A power flow calculation method is developed for the "Source-Grid-Train" system, which includes voltage compensation by the PV inverter.
Simulation results comparing the proposed distributed integration scheme with the existing centralized scheme are presented, focusing on system losses, traction network voltage stability, and economic performance. The results demonstrate that the proposed distributed scheme significantly outperforms the centralized scheme in reducing system losses, stabilizing traction network voltage, and lowering investment costs. The specific conclusions are as follows: 1) For the same PV capacity, the distributed scheme reduces system losses by 57.55% and increases PV utilization by 9.59%, due to high-voltage transmission and local energy absorption. 2) The distributed scheme enables voltage regulation at multiple nodes using reactive power compensation, significantly reducing traction network voltage fluctuations. 3) Under the same traction load and PV configuration, the distributed scheme reduces investment costs by 48.86%, lowers electricity costs by 11.59%, and offers a shorter payback period with a higher benefit-to-cost ratio, making it more economically advantageous.
In conclusion, the proposed distributed integration scheme is more suitable for integrating PVs along ERs compared to existing centralized solutions. Future research will focus on solving the coordinated voltage control issue for traction networks using distributed PV inverters and optimizing system configurations after integrating PV and energy storage.

Key words： Electrified railways photovoltaic distributed integration dynamic power flow calculation voltage compensation.

Received: 17 October 2024

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	Gao Yining
	Hu Haitao
	Ge Yinbo
	Huang Yi
	Guo Xugang
	Liao Kai

Cite this article:

Gao Yining,Hu Haitao,Ge Yinbo等. Research on Distributed Photovoltaic Integration Scheme Along Electrified Railways and Its Electrical Characteristics[J]. Transactions of China Electrotechnical Society, 0, (): 1814-.

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