| The regenerating energy of the urban rail vehicle is quite substantial, having a research on the energy recycling of urban rail vehicle braking and stabilizing the DC traction network voltage within the allowable range is not only a direct relation with the economy, but also an important part for building China’s energy-saving, low-carbon society, and it’s meaningful to alleviate global energy shortages.By comparing the current situation, pros and cons of diverse methods of regenerating energy, the braking energy saving system is selected based on stationary and on-board super capacitor as research object in this paper. The simulation study is based on the prototype of Shenzhen Metro Line 5, the characteristics of the regenerating energy are analyzed, which can be represented as shortly lasting time, high power and high amplitude, and the characteristics of relevant loss and the energy flow of traction and network are researched when the train runs in different conditions.According to power constraint and energy constraint, the series and parallel combination program of the super capacitor is designed at 50% depth of discharge. Considering the highly power strike of the regenerating energy, the bi-directional DC/DC converter is selected as a multiphase staggered parallel topology. An effective control strategy is adopted based on the network voltage and the super capacitor energy state, and simulation study is carried out based on stationary and on-board super capacitor energy saving system, the result is proved that both of the two energy saving systems can effectively curb oscillation of the network voltage, the energy flow of traction is reduced, nearly avoid braking resistor consume the regenerating energy, which can make effective use of braking energy, the feasibility of super capacitor energy storage system and the correctness of the control strategy are showed by the results.Then, the pros and cons of stationary and on-board super capacitor energy storage system are compared in the article, the on-board super capacitor is adopted as the best braking energy saving system, which can significantly deduce the loss of network and make use of regenerating energy at 94.46%. By Analyzing its economic benefits, costs, environmental benefits, a conclusion is got that it can save the costs and begin to obtain a benefit after four years if equip the on-board super capacitor energy storage system, the significance of the energy storage system is indicated both from economic benefits and environmental benefits.The user interface of urban rail vehicle computing system is designed based-on GUI, the user can get the traction energy and regenerating energy of urban rail vehicle by setting vehicle parameters, line parameters arbitrarily, the advantages of reliability, simple operation and system opening are verified.Finally, a prototype experiment for the energy storage control strategy of super capacitors is carried out, the main circuit of the bi-directional DC/DC converter and control circuit of MCU is buit, the control program for experiment is writen to have a charging, discharging and switching test, and the dynamic response is good. |
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