| With large capacity, high speed, land saving and many other advantages, urban rail train has become the best choice to alleviate the urban traffic congestion. Subway produce a large amount of braking energy. Setting up reasonable breaking energy absorption device can not only reduce temperature of tunnel increasing, it can also produce a good comprehensive economic benefit through the utilization of braking energy. In this paper, the main direction is to set the reasonable regenerative braking energy utilization scheme in urban rail system.Firstly, from dynamic aspect, the braking energy of actual metro train is calculated under different initial speed in order to expound the necessity of set up renewable energy absorption device. Then build the metro traction power supply system and the rectifier unit model which is based on the technology of 24-pulse rectifier. Through introduced inverter motor drive control technology and combined with the practical parameters of metro lines, urban rail train power transmission models have been established. When urban rail train operated without renewable energy absorption device, the simulation results were used to analyze the influence on traction network.Secondly, this paper introduces the super capacitor energy storage system. The model’s related parameters are calculated and a unified control strategy for Bi-directional DC/DC Converter is established. Based on the SoC of super-capacitor group and line voltage, the control strategy is designed. The simulation model of super capacitor energy storage system has been established. Then the paper analyzes the changes of waveform related.Then, this paper introduces the regenerative braking energy absorption based on the inverter feedback system. The DC/AC inverter is designed and a appropriate control strategy is selected to realize the switches’ breakover and shut off. Design a suitable filter to filter the harmonic. The simulation model of inverter feedback system has been established. Then the paper analyzes the changes of waveform related.Finally, a new hybrid regenerative braking energy utilization scheme is proposed, which is composed with a regenerative power converter and an energy storage device. The scheme can fully combine the advantages of energy storage and inverter device. The appropriate control strategy is designed and a simulation is carried out, then analysis of the feasibility. |
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