Calculation of Urban Rail AC/DC Power Supply with Traction Substation in Multi-Operation Modes
LIU Wei1, ZHANG Yangxin2, ZHANG Jian1, LI Kunpeng3, LI Qunzhan1
1. School of Electrical Engineering, Southwest Jiaotong University，Chengdu 610031，China; 2. School of Automation and Information Engineering, Sichuan University of Science and Engineering，Zigong 643000，China; 3. Guangzhou Metro Design and Research Institute Co. Ltd.，Guangzhou 510010，China
Abstract：Traction substations operate in such modes as the rectification，rectifier turn-off，constant voltage operation of inverting-feedback devices，and maximum-power operation of inverting-feedback device. To achieve convergence in power flow calculation when the states of traction substations are uncertain，a calculation algorithm for urban rail AC/DC power supply is proposed while it considers the multi-operation states of traction substation. As for this algorithm，the inverting-feedback devices and onboard resistors on trains are modeled. According to the network voltage of the traction substation in the iterative process，the state of traction substation is determined by hysteretic comparison strategy，and the power flow is solved by AC/DC alternating iteration method. The simulation and field tests of a subway project show that the Pearson correlation coefficient between the simulated and measured load process falls between 0.76 and 0.92; and the errors between the simulation and measured energy-saving rate of the inverting-feedback devices are not more than 1.7%. In the case of high no-load voltage of substations in DC traction power supply system，when the starting voltage of the inverting feedback device is set above 1750 V，the energy consumed by the on-board braking resistor is significantly increased.
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