| 摘要 |
PROBLEM TO BE SOLVED: To reduce a starting current to a load and to suppress a transient increase in an output corrent by a method wherein, when a starting command to the load is input, so that an inverter is controlled in such a way that the output voltage of the inverter is made lower than a rated voltage for a prescribed time and a contactor is charged. SOLUTION: DC electric powder which is received by a pantograph 1 charges a filter capacitor 2 is converted into a desired AC electric power by an inverter 3. The output of the inverter 3 is supplied to a load 5 via a contactor 4. A control device 6 controls the contact 4 so as to be charged and released, and it controls the inverter 3. When a starting command 8 is input, the control device 6 controls the output voltage of the inverter 3, so as to be lowered for only a definite time. Then, when the output voltage is stabilized at a voltage which is lower than a rated voltage, the contactor 4 is controlled to be charged. Consequently, since the starting current of the load 5 is proportional to an applied voltage, the starting current of the load 5 in this case can be suppressed more than that in a case in which the load is charged at a rated output voltage. |
