| Citation: | LI Qunzhan, HUANG Xiaohong, WU Bo, XIE Shaofeng. Green Power Utilization and Zero-Carbon Feed-Through Power Supply Technology for Electrified Railways[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20250054 |
Electrified railways rely heavily on public power grids dominated by fossil fuels, and actively carrying out the development and utilization of renewable energy in rail transit is one of the important measures to achieve China’s “carbon peaking and carbon neutrality” goals. To extensively and comprehensively use green power to construct electrified railways with zero-carbon emission, a technical scheme of zero-carbon feed-through power supply and its zero-carbon operation control strategy were proposed. First, the basic methods of new energy connection in electrified railways were analyzed, and the connection points and energy flow paths of renewable energy in the traction power supply system were clarified. On this basis, a technical framework for green power utilization based on feed-through power supply was constructed, and the natural flow of train traction and regenerative power was realized by using the feed-through traction network, thereby reducing the capacities and investment of green power and energy storage equipment. Second, a three-component power balance control strategy covering green power, traction, and energy storage was proposed. Green power was controlled according to maximum power point tracking to maximize on-site power generation; the energy storage devices in the traction substation were controlled for charging and discharging according to the active power specified in the green power purchase/sale agreement with the power grid, thereby achieving zero-carbon operation. Finally, by taking an actual railway line as an example, the effectiveness and economy of the proposed scheme were verified. The results indicate that the zero-carbon feed-through power supply system does not obtain fossil power from the power grid and causes no impact on the power grid; when the active power exchanged with the power grid is zero, the negative-sequence power and through power are also zero. The feed-through power supply traction network eliminates electrical phase separation, and the regenerative braking energy and green power are fully utilized. In the verified case, the total regenerative braking energy of the traction substation accounts for only 0.6% of the traction energy and is all effectively utilized, with a photovoltaic curtailment rate of less than 10%. Green power and energy storage adopt local independent control, which significantly reduces the complexity of communication and power flow control. Based on capacity configuration and economic analysis using actual data of heavy-haul railways, the zero-carbon power supply requirements are met when lithium iron phosphate batteries with a charge/discharge rate of 0.5 C and an energy storage configuration capacity of 145 MW•h are adopted. According to the annual average irradiance and the irradiance under extreme weather conditions, the installed photovoltaic capacities of the entire line need to be configured as 45 MWp and 83 MWp, respectively, with cost recovery periods of about 5.9 years and 6.8 years, respectively.
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