In a significant advancement for electric locomotive technology, researchers have unveiled a groundbreaking uninterruptable power supply (UPS) system aimed at enhancing the auxiliary power systems of trains. This innovative approach addresses a critical challenge faced by electric locomotives and electric multiple units (EMUs): the loss of power when traversing the neutral sections of the power supply grid.
The research, led by Yuliang Du from the Locomotive and Car Research Institute at the China Academy of Railway Sciences in Beijing, explores how auxiliary systems, which are essential for train operations, can be effectively powered even when conventional sources are interrupted. “Our proposed scheme not only ensures that auxiliary systems remain operational during these critical transitions but also regenerates braking power, providing a seamless energy supply,” Du explained.
Traditionally, auxiliary systems rely on either the auxiliary windings of traction transformers or the DC-link voltage from traction converters. However, the latter has proven more reliable during electric braking, while the former often leaves systems powerless at neutral sections. The new UPS scheme developed by Du and his team aims to change that by offering a robust solution that maintains power continuity.
The research highlights the failure reasons behind previous attempts to solve this issue, allowing the team to propose a more effective strategy. The scheme has been validated through simulations and experimental results, demonstrating its practical application on upgraded HXD3C type locomotives. According to Du, “This approach is not only technically sound but also cost-effective, as it leverages updated software control strategies and requires minimal hardware modifications.”
Key control objectives of the new technology include preventing overvoltage and overcurrent, ensuring a stable and uninterrupted power supply. This is particularly crucial for maintaining the safety and reliability of train operations, which are vital for the transportation sector. The implementation of this UPS system could significantly reduce operational disruptions, leading to improved efficiency and reliability in rail transport.
The commercial implications of this research are substantial. By enhancing the reliability of auxiliary power systems, rail operators can minimize downtime and improve service quality, ultimately leading to increased customer satisfaction. As the energy sector continues to evolve, innovations like this one could pave the way for more sustainable and efficient transportation solutions.
This research was published in ‘Railway Sciences’, demonstrating a commitment to advancing railway technology and addressing the pressing needs of the industry. For more information about the work of Yuliang Du and his team, you can visit the Locomotive and Car Research Institute.