电工技术学报  2023, Vol. 38 Issue (9): 2323-2334    DOI: 10.19595/j.cnki.1000-6753.tces.220063
电力系统与综合能源 |
24 kV柔性直流牵引供电系统潮流计算方法与供电特性分析
刘芸江, 胡海涛, 杨孝伟, 胡海, 朱晓娟
西南交通大学电气工程学院 成都 611756
Power Flow Calculation Method and Power Distribution Characteristics Analysis of 24 kV Flexible Direct Current Traction Power System
Liu Yunjiang, Hu Haitao, Yang Xiaowei, Hu Hai, Zhu Xiaojuan
School of Electrical Engineering Southwest Jiaotong University Chengdu 611756 China
全文: PDF (1695 KB)   HTML
输出: BibTeX | EndNote (RIS)      
摘要 潮流分析对于研究24 kV柔性直流牵引供电系统的供电特性具有重要意义,但多层级控制导致柔性直流牵引网的潮流分布更为灵活复杂,使得原有直流牵引供电系统的潮流算法不再完全适用。为此,该文在原有直流牵引供电系统潮流计算方法的基础上,建立24 kV柔性直流牵引供电系统的“控制器-源-网-车”一体化潮流计算模型,详细分析潮流计算与控制器迭代的交互过程,提出一种连续线性潮流法和比例积分控制器(SLPFM-PI)交替迭代的潮流计算方法,以求解考虑多层级控制策略下的牵引网潮流。此外,基于潮流计算,以机车运行电压、接触网载流量为限制条件,分析24 kV柔性直流牵引变电所的供电距离,并研究了不同控制方案下系统供电特性的差异,结果表明该系统控制方案的设计中应减小机车功率的远距离、跨区间传输。
服务
把本文推荐给朋友
加入我的书架
加入引用管理器
E-mail Alert
RSS
作者相关文章
刘芸江
胡海涛
杨孝伟
胡海
朱晓娟
关键词 柔性直流牵引供电系统潮流计算多层级控制供电特性    
Abstract:Since Spanish scholars proposed 24 kV flexible direct current (DC) traction power system (TPS) in 2014. Relevant papers have reported the the power supply structure of the new TPS, the schemes of operation control scheme, and stability. To fully understand the system operation principle, it is urgent to discuss the power supply characteristics of the system. Power flow calculation is of great significance to study the power distribution characteristics of 24 kV flexible DC TPS. In this system, hierarchical control leads to more flexible and complex power flow distribution of flexible DC traction network, however existing methods rarely systematically consider the impact of complex coordinated control between traction substations on power flow calculation. Therefore, the traditional power flow algorithm of DC TPS is no longer fully applicable. To address these issues, this paper proposed a sequential linear power flow method and Proportional-Integral controller (SLPFM-PI) alternating iterative method to calculate traction network power flow considering hierarchical control.
Firstly, the “controller-source-network-train” integrated power flow calculation model was established. Then, the interaction between power flow calculation and controller's iteration was analyzed, accordingly designing a calculation flow chart of 24 kV flexible DC TPS power flow algorithm. Finally, the Matlab/Simulink model of 24 kV DC TPS was built, simulation results verified the correctness of proposed power flow calculation method.
Based on the power flow calculation, the power supply distance of 24 kV flexible DC traction substation was calculated with the limiting conditions of locomotive operating voltage and catenary current capacity, and the differences of the power distribution characteristics of the system under different control schemes was discussed. In discussion, three control schemes were analysed, which can be depicted as scheme one: traditional droop control, scheme two: droop control and regulate average voltage of all traction substations to rated value, scheme three: droop control, regulate average voltage of all traction substations to rated value, and regulate equal output power of traction substations. In case one, set speed of locomotives are 350 km/h, rated power is 8 MW, departure interval is 6 min, recording the voltage and current of each node of traction network during the whole process of first locomotive starts from the head of the traction network to the end of the traction network. During the calculation, the power supply distance L is increased from 80 km to 180 km with the step of 5 km. Under different L, the locomotive shall operate according to the running chart and working conditions set above. when L is different, the minimum value of catenary voltage, and the maximum value of catenary current during the whole process of locomotives operation were recorded. Then, determine the longest power supply distance of the substations meeting the above two constraints when the system adopts different control schemes. In another case, under the same power supply distance L and train operation conditions, the power supply characteristics of the TPS with different control schemes were compared, including minimum voltage of traction network, maximun rail potential, maximun stray current, and power supply efficiency.
Through theoretical analysis and power flow calculation results, the following conclusions can be drawn: (1) The proposed power flow calculation method can accurately calculate the traction network power flow under the different control schemes. (2) According to the normal working voltage of locomotive and the current capacity limit of catenary. Under three control schemes, the maximum power supply distance of 24 kV flexible DC TPS is 135 km, 140 km, and 100 km respectively. (3) Inter region power transmission will bring additional power loss, increase network voltage fluctuation, rail potential and stray current, therefore, the system control scheme should minimize the inter region flow of power in the system. For an actual running line, if the line is short and high traffic density, adopting control scheme three will not cause inter region power transmission of locomotive power. In this case, the advantage of scheme three can be fully used to improve capacity utilization rate of the traction substation. For a long railway line, scheme one or two is a better choice.
Key wordsFlexible direct current traction power system    power flow calculation    hierarchical control    power distribution characteristics   
收稿日期: 2022-01-16     
PACS: TM922.3  
  U223  
  TM732  
基金资助:中央高校基本科研业务费专项资金(2682021ZTPY092)和国家自然科学基金(52107128)资助项目
通讯作者: 胡海涛 男,1987年生,教授,博士生导师,研究方向为牵引供电系统稳定性与供电品质。E-mail:hht@swjtu.edu.cn   
作者简介: 刘芸江 男,1998年生,硕士研究生,研究方向为电气化铁路柔性直流牵引供电技术。E-mail:liuyunjiang98@163.com
引用本文:   
刘芸江, 胡海涛, 杨孝伟, 胡海, 朱晓娟. 24 kV柔性直流牵引供电系统潮流计算方法与供电特性分析[J]. 电工技术学报, 2023, 38(9): 2323-2334. Liu Yunjiang, Hu Haitao, Yang Xiaowei, Hu Hai, Zhu Xiaojuan. Power Flow Calculation Method and Power Distribution Characteristics Analysis of 24 kV Flexible Direct Current Traction Power System. Transactions of China Electrotechnical Society, 2023, 38(9): 2323-2334.
链接本文:  
https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.220063          https://dgjsxb.ces-transaction.com/CN/Y2023/V38/I9/2323