Emergency traction system applied to urban mass transit

Abstract

The invention relates to an emergency traction system applied to urban mass transit. The system comprises a power supply network, an auxiliary system of an urban mass vehicle, a main traction invertor, a traction motor, a power conversion device, an energy storage component and a master controller; the output end of the power supply network is connected with the power conversion device, the main traction invertor and the auxiliary system of the urban mass vehicle respectively; one end of the energy storage component is connected with the high-voltage side of the power supply network, and one end of the energy storage component is connected with the power supply network; the high-voltage side of the power conversion device is connected with the main traction invertor and the auxiliary system of the urban mass vehicle, and the low-voltage side of the power conversion device is connected with the energy storage component; and the traction motor is connected with the output end of the main traction invertor, and drives a train to run; and the power supply network, the auxiliary system of the urban mass vehicle, the main traction invertor, the traction motor, the power conversion device and the energy storage component are connected with the master controller through a communication bus. The system is suitable for high voltage grades, has a smaller volume and long service life, is high in reliability, and wide in an application range, and can be controlled flexibly, the traction load and distance are larger; and time of return on investment is short.

Description

technical field [0001] The invention relates to an emergency traction system applied to urban rail transit. Background technique [0002] Batteries, supercapacitors and flywheels are three types of energy storage components that are mainly used in urban rail transit. Among them, batteries have high energy density, low power density, more energy that can be stored, and stable discharge current. However, the charging time is long, the charging and discharging current is small, sensitive to temperature, the number of cycles is small, and the life is short; while the supercapacitor has high power density, low energy density, large charging and discharging current, high energy conversion efficiency, long cycle life, and safety. High coefficient, wide applicable temperature range, green and environmental protection; flywheel also has high power density, long life, friendly to the environment, high energy utilization rate, but expensive, and safety needs to be improved. [0003] ...

AI Technical Summary

Problems solved by technology

However, the charging time is long, the charging and discharging current is small, sensitive to temperature, the number of cycles is small, and the life is short; while the supercapacitor has high power density, low energy density, large charging and discharging current, high energy conversion efficiency, long cycle life, and safety. High coefficient, wide applicable temperature range, green and environmental protection; flywheel also has high power density, long life, friendly to the environment, high energy utilization rate, but expensive, safety needs to be improved

[0003] Under 750V grid voltage, Bombardier has installed supercapacitors on vehicles for braking energy recovery, and also installed batteries separately as a power source for empty vehicles to return to the warehouse. However, there is still no application of hybrid energy storage devices under 1500V grid voltage. At the same time, it is the first time in China to use the on-board energy storage system to implement heavy-duty emergency vehicle transfer

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