Urban rail train vehicle-mounted energy storage system control method based on power-time curve

Abstract

The invention provides an urban rail train vehicle-mounted energy storage system control method based on power-time curve. The urban rail train vehicle-mounted energy storage system comprises a traction motor, a four-quadrant inverter, two bidirectional DC-DC converters, a control module, a storage battery, a super capacitor, a resistance energy dissipation device and a catenary; in the control method, the double-cut-off frequency is adopted to control the charging action of the storage battery and the super capacitor. The urban rail train vehicle-mounted energy storage system control method has the beneficial technical effects that the urban rail train vehicle-mounted energy storage system control method based on the power-time curve is proposed, according to the scheme, the control method can fully play the advantages of high super capacitor absorption efficiency and large absorption power, reduce the power impact to the storage battery, improve the performance of the hybrid energy storage system, and reduce 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 a vehicle-mounted hybrid energy storage device on the urban rail train. The vehicle-mounted hybrid energy storage device usually adopts a "super capacitor + battery" structure. During the braking process of the urban rail train, the traction motor works in the power generation state, 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 train regenerative braking into high-frequency components and low-frequency components, thereby generating corresponding power control signals, and controlling the bidirectional DC-DC...

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

Images