Patent ID: 7451842

Claim:
A control system for an electric motor car, comprising: a variable-voltage variable-frequency (VVVF) inverter configured to receive DC power from an overhead line or a third rail, convert the received DC power into AC power under variable-voltage, variable-frequency control, and supply the AC power to an AC motor; a constant-voltage constant-frequency (CVCF) inverter configured to receive the DC power and supply constant-voltage, constant-frequency power to auxiliary devices of the electric motor car; a power generation unit configured to supply power to the VVVF inverter and the CVCF inverter; a power storage unit configured to store power from the power generation unit and the VVVF inverter; and a power management unit configured to centrally control power consumption and power supply, the power management unit conducting: power consumption control when the electric motor car carries out a regenerative braking operation, so that the VVVF inverter converts regenerated AC power of the AC motor into DC power, and the power storage unit and the CVCF inverter store and consume the converted DC power; power supply control when the electric motor car carries out a power running operation, so that power from the power generation unit and the power storage unit and supplemental power thereof from the overhead line or the third rail are supplied to the VVVF inverter and the CVCF inverter; and power supply control when the electric motor car carries out a coasting operation, so that power from the power generation unit and the power storage unit and supplemental power thereof from the overhead line or the third rail are supplied to the CVCF inverter.