基于牵引计算的牵引变电所馈线电流仿真计算

Simulating Calculation of Traction Substation's Feeder Current Based on Traction Calculation

传统的交流电气化铁道牵引供电系统仿真一般采用单一的供电系统仿真计算软件,忽略了供电系统和列车牵引运行的内在联系,从而影响了仿真结果的精度。本文详细叙述了如何构建包括列车牵引计算模块和牵引供电系统潮流计算模块在内的综合仿真软件,给出了仿真系统的主体流程,并分析了如何实现牵引变电所馈线电流的仿真计算。分析比较了求解交流牵引供电系统潮流的现有方法,针对其R/X较大的特点,采用了改进PQ分解法求解系统潮流,并利用一个10机车系统进行了实际验证,计算表明该方法性能优良,是求解交流电气化铁道牵引供电系统潮流的有效方法。最后利用所开发的软件成功地仿真了一条具体线路牵引变电所馈线电流随时间变化的过程,验证了其实用性。

Traditional traction power system simulation for AC electrified railway usually adopts simplex power system calculation software, which ignores the inherent interaction between power systems and traction operations; so the simulation precision is not good enough. This paper describes in detail how to construct integrative simulation software including traction calculation module and power system power flow calculation module; provides the main structure of the simulation system; figures out how to realize the simulation calculation of traction substation＇s feeder. A comparative analysis on the existing methods of load flow computation for traction power systems is conducted. Considering the property of large R/X, the paper adoptes an improved PQ decoupled load flow algorithm to solve the traction power system, and applies the algorithm in a practical system with 10 trains. The result of the calculation shows that this algorithm possesses good performance and can be effectively applied to solve load flow of traction power system for AC electrified railway. Finally, the method is applied successfully to simulate the process changing with time of traction substation＇s feeder current of an electrified railway, which validates the integrated simulation software developed.