城市轨道交通供电-牵引-混合储能系统设计与仿真

Design and Simulation of Power Supply-Traction-Hybrid Energy Storage System for Urban Rail Trains

为了进一步提高城市轨道交通列车再生制动能量的回收与利用效率,通过对系统功能需求分析,设计一种基于分布式地面混合储能城市轨道交通列车牵引供电系统结构,建立供电网络、列车牵引和储能系统模型。同时针对低通滤波方式导致锂电池和超级电容出现大量功率交换的问题,提出带超级电容补偿的阶梯功率分配法,该方法运算量小且实时性强,能够避免混合储能系统内部功率循环。结合所提模型和策略,利用MATLAB/Simulink进行仿真试验,仿真结果表明混合储能系统能量利用效率提高了1.39%,稳压率提高了12.75%,节能率提高了6.72%。

In order to further improve the recovery and utilization efficiency of urban rail train regenerative braking energy,a structure of urban rail train traction power supply system based on distributed ground hybrid energy storage is designed through the analysis of system functional requirements,and the power supply network,train traction and energy storage system models are established.Moreover,aiming at the problem that low pass filtering leads to a large amount of power exchange between lithium batteries and supercapacitors,a stepped power allocation method with supercapacitor compensation is proposed.This method has small computation and strong real-time performance,and can avoid the internal power circulation of the hybrid energy storage system.Combined with the proposed model and strategy,MATLAB Simulink is used to simulate.The results validate that the energy utilization efficiency of the hybrid energy storage system is improved by 1.39%,the voltage regulation rate is increased by 12.75%and the energy saving rate is increased by 6.72%.