A control system for centrally controlling information related to an
electric motor car and effectively using power for the electric motor car
involves a VVVF inverter, a CVCF inverter, a fuel cell, a power storage
unit, and a power management unit that centrally controls power of the
electric motor car. When the electric motor car carries out a
regenerative braking operation, the power management unit makes the VVVF
inverter convert AC power regenerated by a motor into DC power and makes
the power storage unit and CVCF inverter store and consume the converted
DC power. When the electric motor car carries out a power running
operation, the power management unit supplies power from the fuel cell
and power storage unit and supplemental power from an overhead line to
the VVVF inverter and CVCF inverter. When the electric motor car carries
out a coasting operation, the power management unit supplies power from
the fuel cell and power storage unit and supplemental power from the
overhead line to the CVCF inverter.