Cophase connected power supply scheme of heavy haul railway based on tree bilateral power supply

Considering the existing characteristics of power supply modes of the heavy haul railway, the cophase connected power supply scheme for traction power supply system of heavy haul railway was proposed. Firstly, three key technologies of the cophase connected power supply scheme were introduced, namely, combined cophase power supply technology, tree bilateral power supply technology and traction network sectional power supply and state measurement and control technology. The balanced current of tree bilateral power supply system and the impedance of the single-line traction network were studied in detail. Secondly, taking the reconstruction project of a heavy haul railway traction power supply system as an example, the scheme of cophase connected power supply was applied to the engineering renovation of traction power supply system of the line. Finally, through the theoretical analysis and actual measurement analysis, the feasibility of the existing line cophase connected power supply renovation scheme was analyzed from the aspects of operation mode, the actual measurement analysis of the balanced current and the adaptability of the traction network sectional measurement and control technology. The results show that the cophase connected power supply scheme based on tree bilateral power supply is feasible, and has better system performance and technical advantages. © 2020, Central South University Press. All rights reserved.