An Energy Conscious PV Generation and Energy Storage Based Converter for Metro DC Traction Grid

2020 IEEE Vehicle Power and Propulsion Conference (VPPC) Pub Date : 2020-11-01 DOI:10.1109/VPPC49601.2020.9330950

Hongbo Li, Chao Zhang, Zihao Huang, Wenguang Luo

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Abstract

In recent years renewable energies are gradually being introduced to cope with issues accompanying with a rapid growth of the urban rail transit, such as tremendous energy consumption, serious carbon emission, limited capacity of the existing traction substations, etc. An energy conscious converter, combining a quasi-z source network based photovoltaic generation system and a high conversion ratio energy storage circuit, is proposed for the metro DC traction grid in this paper. The maximum power traction can be achieved through coordinated control between the LLC converter and quasi-z source network without additional conversion stages. The braking energy of trains can be recycled by the energy storage system besides absorbing the excessive solar energy. Adopting the presented modulation strategy in this paper, the gross voltage of batteries is no higher than one-fourth of the DC traction grid voltage. Therefore, fewer batteries need to be in series, which decreases the premature failure probability of the battery pack caused by the over- or under-charging of unbalanced individual cells.

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基于节能光伏发电和储能的地铁直流牵引电网变换器

近年来，随着城市轨道交通的快速发展，城市轨道交通面临着能源消耗巨大、碳排放严重、现有牵引变电站容量有限等问题，可再生能源逐渐被引入。提出了一种基于准z源网络的光伏发电系统与高转换比储能电路相结合的城域直流牵引电网节能变换器。通过LLC变换器与准z源网络之间的协调控制，在不增加转换级的情况下实现最大功率牵引。除了吸收多余的太阳能外，储能系统还可以回收列车的制动能量。采用本文提出的调制策略，蓄电池总电压不高于直流牵引电网电压的四分之一。因此，需要串联的电池数量更少，减少了单体电池不平衡充电过少或过充而导致电池组过早失效的概率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2020 IEEE Vehicle Power and Propulsion Conference (VPPC)

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