Research On Low Floor Light Rail Vehicle Hybrid Energy Storage System

ABSTRACT:It is difficult to build overhead contact lines in the busy urban view spots or crowded traffic hubs for light rail vehicles. One way to solve this problem is to add energy storage equipment, used as a power supply. The paper, which takes hybrid energy storage system (HESS) based on batteries and super capacitors as the subject for the low floor light rail vehicle, mainly works focuses on energy management unit design, control and implementation, to achieve the operation without overhead contact line.F Firstly, the paper completed power management unit overall design of the HESS. Batteries and super capacitors respectively by two sets of paralleled bi-directional DC/DC converters to provide stable power supply for main converter system and auxiliary converter system of the vehicle, at the same time absorbing the braking energy, finally realize the operation without overhead contact line. It combines the advantages of batteries and super capacitors, the former a whole endurance life supplier, while the latter works as both a peak power supplier and a braking energy consumer.On the basis of the actual traction calculation on the basis of energy and power to complete the matching design energy storage element.Secondly, the paper completed HESS bi-directional DC/DC converter modeling and controller design. According to the actual operating conditions of the vehicle, based on analyzing the working principle of bi-directional DC/DC converter, the average state space method used to establish HESS dynamic model and feedback controllers are designed. Finally, based on the MATLAB platform to complete the simulation, the results show that the proposed control strategy is effective.Thirdly, with successful theoretical analysis and simulation verification a real HESS is built, including the main circuit, control circuit, drive circuit and power supply circuit and hardware circuits tested function well. Finally, the proposed algorithms put into the actual hardware circuit. Experimental results show the reasonablity of hardware design and verification the availability of control strategy.