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Hybrid energy storage system for subway

A hybrid energy storage system, subway technology, applied in electric vehicles, electrical components, transportation and packaging, etc., can solve problems such as capacity redundancy and low recovery energy, achieve optimal distribution, improve recovery efficiency, and reduce parallel capacity and systems. cost effect

Active Publication Date: 2018-06-01
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a hybrid energy storage system for subways to solve the problems of redundant capacity and low energy recovery in current urban subway energy storage systems

Method used

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Embodiment Construction

[0038] In order to make the purpose, technical solution and advantages of the present invention more clear and definite, the content of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention are shown in the drawings but not all content.

[0039] Such as figure 1 As shown, the hybrid energy storage system of the present invention includes a lithium battery pack 10 , a supercapacitor pack 20 , a first bidirectional DC / DC converter 30 , a second bidirectional DC / DC converter 40 and a cooperative controller 50 . The low-voltage side of the first bidirectional DC / DC converter 30 is connected to the lithium battery pack 10, the low...

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Abstract

The invention provides a hybrid energy storage system for a subway, and the characteristics of high specific energy of a lithium battery and high specific power of a super capacitor are combined, andthe influence of factors such as a subway peak, a flat peak operation time period, a traction network voltage interval and the like are comprehensively considered. An optimal distribution strategy ofthe metro feedback electric energy between the lithium battery pack and the supercapacitor bank and the capacity design method of the hybrid energy storage system are obtained. On the premise that thevoltage of the traction network is in the safe range, the power / energy of the battery pack and the supercapacitor bank can be reasonably distributed. The recovery efficiency of the metro feedback electric energy is effectively improved. Meanwhile, the upper limit of the power required by the lithium battery pack is reduced, and the parallel capacity and the system cost of the lithium battery packcan be reduced.

Description

technical field [0001] The invention relates to the technical field of rail transit energy saving, in particular to a hybrid energy storage system for subways. Background technique [0002] During the braking process of the urban subway, the braking energy equivalent to 30% of the traction energy can be fed back to the DC traction network, and the excess electric energy that cannot be absorbed by other vehicles is generally consumed by resistors to avoid the safety problems of the traction network caused by voltage rise , but it also leads to a waste of feedback energy. [0003] The energy storage system is used to recover the excess braking energy of the subway DC traction network. On the one hand, it can prevent the voltage from being too high and realize energy saving. On the other hand, the stored energy can be released when the vehicle accelerates to provide voltage support. However, the electric energy fed back by subway braking has the characteristics of high power a...

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Application Information

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IPC IPC(8): H02J7/34H02J7/00
CPCH02J7/0013H02J7/345
Inventor 林仕立宋文吉冯自平吕杰陈明彪赵永杰
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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