Recently, the first 128-kilometer through-type in-phase power supply demonstration project in China has fulfilled power transmission to the overhead lines at the Nalinchuan traction substation on the Bazhun Line of the Xinshuo Railway, marking the completion of power transmission for both traction substations of the Project, with significant practical importance in leading technological innovation in the heavy-haul railway transportation industry and promoting electrified railway development.
Leveraging the theory of in-phase power supply, modern power electronics technologies, and modern measurement and control technologies, the Project upgraded in-phase power supply at individual substation to through-type in-phase power supply. Before power transmission, 17 static tests were conducted on various aspects, including power unit electrification for in-phase power supply devices, series-connected measurement of grid connection, and parallel-connected measurement of the stable operation of busbar. All test results met standards, and all equipment went on normal operation after power transmission. Upon completion, the Project will mark the achievement of technology leadership in traction power supply systems by enabling segmented measurement and control along the entire line and bidirectional through-type power supply. This advancement will fully exploit the power supply capacity of the traction power supply system, enhancing the operation capacity of the Bazhun Line by 6%. It is estimated to save approximately RMB 10 million in annual basic electricity costs, improve the stability of the traction power supply system and reduce operation and maintenance costs, facilitating cost reduction, efficiency improvement, and value creation capability enhancement for the company.
