Control method of on-board energy storage system of urban rail train based on power-time curve

Abstract

The present invention proposes a method for controlling the on-board energy storage system of urban rail trains based on a power-time curve. The on-board energy storage system of urban rail trains includes a traction motor, a four-quadrant inverter, two bidirectional DC-DC converters, A control module, a storage battery, a super capacitor, a resistance energy consuming device and a catenary; in the control method, double cut-off frequencies are used to control the charging action of the storage battery and the super capacitor; the beneficial technical effects of the present invention are: The control method of the on-board energy storage system of urban rail trains based on the power-time curve, this scheme can give full play to the advantages of high absorption efficiency and large absorption power of super capacitors, reduce the power impact on the battery, improve the performance of the hybrid energy storage system, reduce the Unnecessary heat dissipation.

Description

technical field [0001] The invention relates to a braking energy recovery technology for urban rail trains, in particular to a control method for an on-board energy storage system of urban rail trains based on a power-time curve. Background technique [0002] In order to recover and utilize the braking energy of urban rail trains, the most common method is to install on-board hybrid energy storage devices on urban rail trains. The on-board hybrid energy storage device usually adopts the structure of "super capacitor + battery". During the braking process of the urban rail train, the traction motor works in the state of generating electricity, converting the kinetic energy of the vehicle into electrical energy. At the same time, a first-order low-pass filter is used to decompose the power of the train regenerative braking into high-frequency components and low-frequency components, so as to generate the corresponding power control signal, and control the bidirectional DC-DC c...

AI Technical Summary

Problems solved by technology

[0003] The existing problems are: firstly, during the braking process of the train, as the running speed decreases, its braking power is a dynamic and gradually decreasing process

At this time, the first-order low-pass filter energy distribution method with a fixed cut-off frequency is adopted. Due to the small idle capacity of the supercapacitor, the corresponding braking energy can only be absorbed in a small amount, and the unabsorbed energy can only be absorbed by the resistance energy dissipation device The heat is dissipated in the form of heat; although the battery has a large idle capacity, it is limited by the charging power due to its low power density. At this time, the braking power is relatively large, and it may absorb a certain amount of braking energy. It is still not fully charged, which not only makes the utilization rate of the on-board hybrid energy storage device not high, but also the unnecessary heat dissipation of the resistive energy-consuming device will also affect the increase of the ambient temperature of the on-board hybrid energy storage device, causing a burden on the temperature control system

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