VARIABLE POWER DRIVE CONTROL SYSTEM USING SERIAL-PARALLEL CONVERTING CIRCUIT

摘要

PURPOSE: A variable power drive control system 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 serial-to-parallel voltage converting circuit is connected to a variable power supply line. Four inverters are connected to form a serial circuit and a parallel circuit and invert a polarity of a power signal from the serial-to-parallel voltage converting circuit 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 750V, are connected in series by the serial-to-parallel voltage converting circuit, 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 750V, are connected in parallel by the serial-to-parallel voltage converting circuit, so that the DC power of 3000V is converted into a DC power of 750V.