- 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: | LIU Wei, ZENG Jiaxin, MA Qingan, ZHANG Jian, XIONG Peng, QI He. Calculation of Collaborative Power Flow for Urban Rail Traction Power Supply System with Bidirectional Converter Device[J]. Journal of Southwest Jiaotong University, 2023, 58(5): 1145-1153. doi: 10.3969/j.issn.0258-2724.20220494
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The bidirectional converter device can effectively inhibit the fluctuation of the DC-side grid voltage at traction substation, reduce the current transmitted between regions, and limit the rail potential. As the collaborative control strategy of the bidirectional converter and rectifier unit will directly affect the power flow of urban rail traction power supply system, a coordinated power supply scheme composed of a bidirectional converter device and a 24-pulse rectifier is proposed, and the comprehensive output characteristics of traction substation with this scheme are analyzed. The power supply calculation model of traction substation is established, allowing for the accurate active power loss of converter device, and a multi-state switching control strategy with hysteresis comparison is proposed to calculate the cooperative power flow for urban rail traction power supply system with a bidirectional converter device. Compared with Simulink simulation results, the effectiveness and accuracy of the algorithm are verified. In the simulation of a subway project, under the collaborative power supply scheme, when the traction network pressure increases, the maximum rail potential decreases by 12.6%–15.6% and 14.7%–17.5% up and down the whole line, respectively. The loss of DC traction power supply system and the overall cost of the system can be reduced by 9.7% and 1.17% at most. As the rectifier starting voltage of the bidirectional converter device increases, the rectifier/inverter power of some traction substations increases, and the loss of DC traction power supply system increases first and then decreases, but the rail potential changes little. In practice, when the inverter starting voltage of the bidirectional converter is fixed, increasing the rectifier starting voltage appropriately can achieve better energy saving.
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