Propulsion control apparatus of electric motor vehicle and control method for propulsion control apparatus

A control method for a propulsion control apparatus of an electric motor vehicle, the propulsion control apparatus including:

• a first power converter that is connectable to a direct-current common section, operates as a DC/AC converter when direct-current power is input from the direct-current common section, converts the direct-current power into desired alternating-current power and supplies the desired alternating-current power to a motor that generates a driving force for a vehicle, operates as an AC/DC converter according to necessity when regenerative power of the motor is input from the motor side, and supplies the regenerative power to the direct-current common section;
• a second power converter that operates as an AC/DC converter when alternating-current power supplied from an alternating-current power supply source is input from a first input and output end side, converts the alternating-current power into direct-current power and outputs the direct-current power to the direct-current common section via a second input and output end different from the first input and output end, operates as a DC/AC converter and output desired alternating-current power to the first input and output end side when direct-current power supplied from the direct-current common section is input from the second input and output end side, operates as a DC/DC converter and outputs desired direct-current power to the second input and output end side when direct-current power is input from the first input and output end side, and operates as the DC/DC converter and outputs desired direct-current power to the first input and output end side when direct-current power is input from the second input and output end side;
• a power storage device functioning as a direct-current power supply source that is configured to be connectable to the direct-current common section and the first input and output end side and charged with direct-current power supplied from the direct-current common section or the first input and output end side or discharges direct-current power to the direct-current common section or the first input and output end side;
• and
• a control device that controls operations of the first power converter, the second power converter, and the power storage device,
• the control method comprising setting the voltage of the direct-current common section to different voltages during departure and during power running.