Page 521 - B2B All Year Round Vol.8

Regenerative Energy Saving System

Regenerative energy saving system is ESS-like system absorbs regenerative energy, that occurs when the train is
braking, and store that to batteries. Regenerative energy is large(about 500kW @ 2000V by urban metro) but
appears in a very short time(within 10sec). So, We apply many new technologies to stabilize this energy and store it
in Li-ion battery batteries, which used in ordinary energy storage systems.

Regenerative Converter
Capacitor Bank (100kW ~ 2,000kW) Battery Bank ESS PCS
& Control Unit

Power Grid
(In Station)
Catenary
Voltage
(900Vdc ~
2,000Vdc)

Urban railway Regeneration ESS

Grid Transformer Rectifier

Regenerative ESS PCS Grid
Substation Converter
Battery Bank Metro Station
Catenary Voltage ≈ 1,500V
Regenerative Energy
(Catenary voltage increased)

Inertia
G G G G
Power generation during break

System Features

•Convert high-voltage/high-capacity power to low-voltage/low-capacity power(DC/DC)
•Converter modularization enables to apply common parts/components in a system
•Serial-Parallel combination enables input/output capacity varying design(with 100kW module)
•Registered patent on technologies applied in system

Core Technologies Expected effects

•Hybrid with peak-cut energy storage system •Increasing energy conversion efficiency
•Converter modularization •Reducing cost for system installization
•serial-parallel combination operation •Multi-applicable energy from wasting sources
•Isolation-type power conversion •Energy storage media can be chosen
•Voltage un-balancing compensation control •Enable to connect with renewables

6 ︱