- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | KANG Dejian, YI Dong, WANG Hui. Operation Status of Tree Continuous Co-phase Power Supply System of Heavy-Haul Railways[J]. Journal of Southwest Jiaotong University, 2023, 58(6): 1240-1247. doi: 10.3969/j.issn.0258-2724.20220723
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The tree continuous co-phase power supply system of heavy-haul railways can minimize the safety hazards caused by neutral sections in the line and improve the utilization rate of regenerative braking energy, power supply capacity, and power quality of the traction power supply system. In order to make the tree continuous co-phase power supply system run smoothly, the operation status of the system was studied from four aspects: equalizing current, power supply capacity, negative sequence evaluation, fault analysis, and protection configuration. The equalizing current evaluation model of the bilateral power supply system under different topologies was constructed to reveal the external power supply composition of the tree continuous co-phase power supply system of heavy-haul railways. With the tree continuous co-phase power supply transformation scheme of a heavy-haul railway as an example, the power supply capacity of the system under normal and fault conditions and the negative sequence impact on the external power grid were explored. Different types of faults in the system were analyzed, and the protection configuration scheme of the system was proposed. Compared with parallel bilateral power supply, the results show that the tree continuous co-phase power supply system will not produce an equalizing current when the transformer ratios of two adjacent traction substations are the same. The minimum voltage of the up and down traction network of the transformation scheme is 22.74 kV, which meets the voltage requirements of the traction network. By setting the combined co-phase power supply device, the 95% probability value and maximum value of the three-phase voltage unbalance factor of the system are 1.20% and 1.65%, respectively. Compared with the traditional protection device scheme, the proposed protection configuration scheme can ensure the minimum outage interval of the traction network.
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