| With boom of urban population, role of urban rail transit gets more and more important. Economically seen, energy consumption of urban rail transit system is most noticeable. Cost of energy plays a large part in running cost. How to effectively utilize energy and reduce energy consumption is an important topic for us. Indicated in survey, energy consumptions in traction and auxiliary equipment share90%and10%in energy consumption of vehicle on urban rail, respectively. If energy management equipment e.g. super-capacitor are used, much of consumed energy can be fed back to power supply system at braking of vehicle to support vehicle being accelerated. Besides, use of proper energy management equipment can reduce fluctuation of voltage that may be caused at start and braking of train thus improve quality of power supply.In the paper, based on study on topologies of super-capacitor and different types of bidirectional DC/DC converters, a non-isolated bidirectional DC/DC converter based on DSP control is put forward for application in on-board super-capacitor energy management system. First, application and characteristic of super-capacitor, as well as voltage sharing at serial connection and common charging control strategy of super-capacitor are studied, followed by comparative analysis on topologies of non-isolated/isolated bidirectional DC/DC converter and isolated low-voltage high-current circuit rectifier, and bidirectional Buck-Boost converter suitable for on-board super-capacitor energy management system is put forward. Work procedures of converter in step-down and step-up mode are analyzed in detail, and model analysis is carried out by means of state space process. Besides, given actual engineering demands, main circuit and digital control system are designed. Finally, prototype of converter is experimentally verified, and super-capacitor charging experiment is finished. |
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