DC VARIABLE MAIN CIRCUIT SYSTEM FOR RAILWAY VEHICLE

摘要

PURPOSE: A DC variable main circuit is provided to enable a railway vehicle to travel directly without exchange of a railway vehicle by corresponding elastically according to a railway system and a power supply manner of each nation. CONSTITUTION: A variable voltage converting device is connected to a variable power supply line. Two inverters are connected to form a serial circuit and a parallel circuit selectively by plural mechanical switches so as to supply current needed for a railway vehicle travel to electric motors. When a DC power of 3000V is supplied from the variable power supply line, the inverters whose regulated voltage of a DC link terminal is 1500V, are connected in series by the variable voltage converting device, so that the DC power of 3000V is converted into a DC power of 1500V. When a DC power of 1500V is supplied from the variable power supply line, the inverters whose regulated voltage of a DC link terminal is 1500V, are connected in parallel by the variable voltage converting device, so that the DC power of 1500V is converted into a DC power of 3000V.