Energy storage regenerative braking energy recovery method and system based on supercapacitor

Abstract

The invention discloses a method and a system for recovering regenerative brake energy of an energy storage type urban rail based on a supercapacitor. The method comprises the following steps of connecting a direct current traction network of the urban rail through a chopping unit and a supercapacitor unit, wherein the chopping unit comprises two bidirectional chopping module units; according to the connecting type of the two bidirectional chopping module units of the direct current traction network, and the voltages of the direct current network and the supercapacitor, controlling the charging and discharging of the supercapacitor unit. The system comprises the chopping unit, the supercapacitor unit, a chopping control module and a direct current isolation switch unit, wherein the chopping unit comprises the two bidirectional chopping module units which are connected in series or parallel, and each bidirectional chopping module unit comprise one or more than one bidirectional DC / DC (direct current / direct current) chopping module which is connected in parallel. The method and the system have the advantages that the regenerative brake energy of the urban rail can be recovered and fed back, and the method and the system can be applied to the common DC1500V / DC750V direct current traction networks; the universality is strong, the reliability is high, the stability is good, the production cost is low, and the flexibility is high.

Description

technical field [0001] The invention relates to a regenerative braking energy recovery technology for urban rail trains, in particular to an energy storage type regenerative braking energy recovery method and system based on a supercapacitor. Background technique [0002] In recent years, the construction of urban rail transit in my country has developed rapidly. As an important part of rail transit, urban rail power supply system, its energy consumption index is an important indicator of urban rail operation. There is an ever-increasing demand for regenerative energy. In order to promote the development of urban rail transit construction in a resource-saving, environment-friendly, green and sustainable direction, it is necessary to carry out research on the secondary energy-saving utilization system of rail transit regenerative braking energy. [0003] At present, the regenerative braking energy feedback device is more maturely applied at home and abroad, which converts the...

AI Technical Summary

Problems solved by technology

However, the application experience of this scheme in domestic subway operation is very little at present, so the supercapacitor energy storage type regenerative braking energy recovery device is not mature enough in topology, power module design or control system design, and has certain defects.

The DC traction network voltage of my country's urban rail power supply system is generally DC1500V standard or DC750V standard. For these two different DC traction network voltage levels, it is generally necessary to carry out corresponding scheme design for the regenerative braking energy recovery device, which is not conducive to the product mass production of

At present, the chopper module of the supercapacitor energy storage type regenerative braking energy recovery device generally has the problems of large size, low switching frequency, and cannot be hot-swapped.

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