A domestic subway energy storage project  

Challenges

1) The urban rail transit has the characteristics of short station spacing, high traffic density, frequent train starting and braking, etc., and the energy generated by train braking can be 20%-40% of the energy consumed by the traction system;

2) The regenerative braking energy absorption device changes from the previous resistance energy consumption type device to the current inverter feedback type device;

3) The increasing proportion of braking energy may bring about the problem of harmonic interference in the public power grid.

Implementation

This project is a subway project with flywheel energy storage system. We provide one set of 1MW flywheel energy storage equipment. The specific parameters are as follows:

The project changes from a traditional inverter feedback absorption device to a flywheel energy storage device. Flywheel energy storage belongs to physical energy storage, using magnetic levitation technology, with flywheel rotor in a vacuum chamber, and operating in an environment without wind resistance. The flywheel energy storage device is installed in the rail transit traction substation. When the train enters the station for braking, the flywheel absorbs energy and converts electrical energy into kinetic energy; when the train accelerates to leave the station, the flywheel releases energy and converts kinetic energy into electrical energy, and releases the energy for the train's use, which has an excellent energy-saving and voltage-stabilizing effect.

Application effect

The energy generated by braking of the rail transit train can be about 20%-40% of the energy consumption of the traction system, and the flywheel energy storage device makes full use of this part of the energy, which can significantly reduce the operating cost of rail transit, reduce carbon dioxide emissions, and improve the safety and stability of train operation.