Abstract
The all parallel autotransformer (AT) traction power supply system (TPSS) including several subsections is widely used for high-speed railways. Unfortunately, any fault of catenary and negative feeder will cause all subsections power interruption in the whole system. Moreover, due to the nonlinear relationship between the distance and impedance as well as the symmetry of the system, conventional distance protection schemes fail to identify the fault subsection and the fault types. In this paper, a novel segmental power supply scheme is presented, which can switch the catenary and negative feeder at each AT subsection on and off independently. Based on the theoretical analysis of the electrical characteristics of the traction power network, multiterminals synchronous information is applied and a hybrid fault identification method is proposed, which can accurately identify the fault subsection and fault type. Consequently, only the catenary or negative feeder at the fault subsection will be quickly removed from service without the effect on normal operation of other subsections. Therefore, the reliability of all parallel AT TPSS is improved considerably. This method was verified through simulation and laboratory experiments by the case studies.
Highlights
Nowadays, Chinese high-speed electric multiple units (EMU) demand a power more than 20 MW for maximum speeds of up to 350 km/h
Based on the segmental power supply scheme, the protection system hybrid identification method was designed for the low/high transition resistance fault which was adopting the hybrid identification method was designed for the low/high transition resistance fault verified through simulations and laboratory experiments by the case
Compared to the which was verified through simulations and laboratory experiments bystudies
Summary
Chinese high-speed electric multiple units (EMU) demand a power more than 20 MW for maximum speeds of up to 350 km/h. With the advantages of longer feeding distance, lower voltage loss, and less electromagnetic interference, all parallel AT TPSS is widely applied to high-speed railways [1,2,3]. In AT TPSS, the traction substation (TS) delivers energy to EMUs by means of a double wire (catenary and negative feeder) system. The voltage between the catenary and negative feeder is 55 kV. The AT terminals are connected to bus bars of the catenary and negative feeder, whereas its middle winding point is connected to the rail. To obtain further feeding ability, the upward direction and and downward downward direction direction direction are are parallel-connected parallel-connected to to the the bus bus bars bars in in the the TS, TS, ATS, ATS, and and SP. AT are connected to the catenary and negative feeder though the double pole circuit breakers.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call