| In urban rail transit, the train is often in the condition of staring and braking, so the braking energy is considerable. Resistance is used to absorb the regenerative braking energy produced by train at present, but it also causes temperature of tunnel increasing and energy wasting. How to recycle the regenerative braking energy will be one of the hot issues in urban rail transit systems. In this paper, super capacitor is used into urban rail energy storage system. The super capacitor with its long life, large capacity, rapid charging and discharging characteristics has the unique advantage in reducing the voltage fluctuation of the traction net and improving energy utilization efficiency.Firstly, this paper introduces the principle of regenerative braking in AC,DC traction system, and do comparative analysis of various energy processing devices.Secondly, the paper makes the research on the regenerative braking energy produced by subway vehicles with full-load. At the same time, makes the simulation on absorbing the braking energy by the super capacitor in the single-vehicle operation and different traffic density in urban rail transit system.Then, this paper studies the non-isolated half bridge Bi-directional DC-DC Converters (BDC), the regenerative braking energy can flow between urban rail trains and super capacitors by the BDC. According to the different work conditions of urban rail trains, such as traction, coasting drifting and braking, the paper proposes the super capacitor energy storage device based on BDC.Finally, the paper gives a detailed analysis of the maximum-energy produced by the subway vehicles with different traffic density in urban rail transit system. The detailed parameters of the energy storage device are designed. Then the special model is established by MATLAB/SIMULINK, verifying that the usage of the super capacitor energy storage device in urban rail transit system is feasible. |
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