24kV柔性直流牵引供电系统潮流计算方法与供电特性分析  

Power Flow Calculation Method and Power Distribution Characteristics Analysis of 24 kV Flexible Direct Current Traction Power System

作　　者：刘芸江 胡海涛[1] 杨孝伟 胡海 朱晓娟[1] Liu Yunjiang;Hu Haitao;Yang Xiaowei;Hu Hai;Zhu Xiaojuan(School of Electrical Engineering Southwest Jiaotong University,Chengdu,611756,China)

机构地区：[1]西南交通大学电气工程学院,成都611756

出　　处：《电工技术学报》2023年第9期2323-2334,共12页Transactions of China Electrotechnical Society

基　　金：中央高校基本科研业务费专项资金(2682021ZTPY092);国家自然科学基金(52107128)资助项目。

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。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,s

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 

分 类 号：TM922.3[电气工程—电力电子与电力传动] U223[交通运输工程—道路与铁道工程] TM732