交流牵引供电系统双边供电均衡电流的预估方法

Prediction of Balanced Current in Bilaterally-fed AC Traction Power Supply System

交流牵引供电系统双边供电方案的可行性取决于均衡电流。文章提出一种均衡电流的预估方法,即在分区所测量两侧牵引网的电压,均衡电流应该等于两侧牵引网均为空载时两侧牵引母线的电压差除以折算至牵引侧的系统总阻抗。首先,对带回流线的直供方式和AT供电方式进行研究;其次,基于IEEE 14节点系统对均衡电流预估方法进行验证;最后,将该方法应用于巴准铁路双边供电方案的可行性研究中。试验表明,均衡电流的误差与牵引网空载电流相当,可用于双边供电和贯通式同相供电的研究。

The feasibility of bilaterally-fed AC traction power supply system is up to the balanced current. A method was proposed in this paper to predict the balanced current i.e., measuring the voltages of the traction power networks on both sides in the section post, and then dividing the no-load voltage difference by the total system impedance that was referred to the traction networks. Firstly, the power supply schemes of trolley-rail & negative-feeder(TRNF) and auto-transformer were studied. Secondly, the balanced current prediction method was verified with the IEEE 14-bus test system. Finally, the feasibility of bilaterally-fed power supply scheme on the Batuta-Jungar railway was discussed. The test shows that the errors of the balanced current are approximately equivalent to the no-load current of the traction network, so the proposed method can be used in the studies of bilaterally-fed and continuous co-phase power supply schemes.