Power conversion system

A power conversion system comprising:

• a transformer configured to step down power from an overhead wire;
• a power conversion device for travel configured to convert first alternating current power supplied via a secondary winding of the transformer into power for travel for driving a travel motor configured to allow travel of an electric vehicle and to supply the power for travel to the travel motor;
• a power conversion device for auxiliary power sources including a first alternating current to direct current conversion unit configured to convert second alternating current power supplied via a tertiary winding of the transformer into direct current power, a power conversion unit for alternating current loads configured to convert the direct current power produced through conversion by the first alternating current to direct current conversion unit into alternating current power for driving an alternating current load mounted in the electric vehicle and to supply the alternating current power to the alternating current load, and a power conversion unit for direct current loads configured to convert the direct current power produced through conversion by the first alternating current to direct current conversion unit into direct current power for driving a direct current load mounted in the electric vehicle and to supply the direct current power to the direct current load;
• an electrical storage device connected to a power line connecting a direct current power output terminal of the first alternating current to direct current conversion unit and direct current power input terminals of both the power conversion unit for alternating current loads and the power conversion unit for direct current loads;
• and
• an auxiliary device connected to a power line connecting the power conversion device for auxiliary power sources and the electrical storage device, the auxiliary device being configured to operate with power supplied from the electrical storage device.