Does a stationary hybrid energy storage system work in Metro traction substations?

This paper focuses on the configuration of a stationary hybrid energy storage system, located in metro traction substations in turn located inside Metro stations. The recuperation energy of the metro braking phase is then reused to feed stationary electrical loads of metro stations.

What are the benefits of storing energy in Metro stations?

In turn the stored energy could power upon demand selected stationary electrical loads in Metro stations of a non-safety critical character (such as lighting, ventilation, pumps, etc.) leading to very significant energy savings and to a corresponding reduction of greenhouse gases.

How regenerative energy is used in Metro stations?

Consequently, the power consumed by the elevator system in metro stations will rise. Therefore, Mode 2 is adopted in summer and winter seasons. In Mode 2, the regenerative energy is prioritized to be sent back to the AC 400 V grid to supply the low-voltage load consumption in the station.

What is energy storage system?

The energy-storage system consists of supercapacitors and a bi-directional DC/DC conversion circuit. According to the state of the metro train’s operation, the storage system can be controlled to inject or absorb energy, thereby stabilizing the DC busbar and compensating for energy deficiencies.

How much does a stationary storage system cost?

An implementation of the stationary storage system to Line 2&3 rectifier substations would cost 17 mi.€, saving on an annual base about 4 mi.€ electricity expenses for the operator as well as 8.600 tons CO 2 for the sake of the community.

Should energy storage be included in the electric grid?

Integrating storage in the electric grid, especially in areas with high energy demand, will allow clean energy to be available when and where it is most needed. As New York continues to invest and build a cleaner grid, energy storage will allow us to use existing resources more efficiently and phase out the dirtiest power plants.