| 摘要 |
PROBLEM TO BE SOLVED: To reduce delay of a control system and suppress voltage variation to smoothly operate a load by receiving an external signal and controlling for a constant period a voltage of a power converter depending on a voltage command pattern outputted from a voltage command pattern output means. SOLUTION: Upon reception of an external signal 7, a voltage command pattern output means 18 adds a voltage command pattern 18a including voltage and time to a voltage setting value of a voltage setting device 9. A pattern 18a outputted from the voltage command pattern output means 18 reduces a DC voltage during the period indicated in the voltage command pattern 18a. A pattern width outputted from the voltage command pattern output means 18 is set corresponding to the time where a load variation is generated. Therefore, when influence of sudden change of load is eliminated, a DC voltage also becomes constant. A shape of pattern of this voltage command pattern 18a is determined through the simulation of circuit and trial use in the actual plant. |
