摘要：Braking energy in Electric traction system of electric trains is significant because of trains' frequent
accelerating, braking process, so braking energy recovery of urban rail vehicles has been one of the
primary objectives in recent years. Energy saving technologies in the railway electric traction field
can be mainly divided into two domains: The first one enhances efficiency of traction equipment,
such as power electronics converters or traction motors. The other is recovery of kinetic energy in
deceleration process of electrified train by applying energy storage devices, or active rectifiers,
reversible rectifiers placed to traction substations. The paper presents a regenerative braking energy
recovery system based on super-capacitor energy storage system. When electric trains operate in
accelerating or braking regimes, the voltage of DC bus will fluctuatesharply to compare with its
normal voltage level; therefore, an energy charge /discharge system should be used to not only
manage the power flow but also adjust the voltage of the metro contact electric network. For these
reasons, super-capacitor energy storage system (SESS) will be integrated to traction motor drive
system to recuperate regenerative braking energy in braking phaseand support energy for acceleration
phase. Braking energywill be stored in the super capacitors thanks to a bidirectional DC-DC converter
interface, and designing control strategy for energy exchange between line utility with traction drive
system is to manage UDC-link at a fixed value. At the end, simulation results of the whole system
which includes power supply unit, traction motor, driven controller, super-capacitors, Interleaved
bidirectional DC-DC converter of line 2 Cat Linh-Ha Dong, Viet Nam have been verified on
Matlabsimulink, Simpower system.
关键词：Bidirectional DC-DC converter; super-capacitorenergystorage system (SESS); traction;
motor drive
