| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power quality upgrading device for restricting an increase in power voltage and a harmonic overcurrent generated at light loading. <P>SOLUTION: When reactive power detected by a reactive power meter 22 is not smaller than predetermined advanced-phase reactive power, a controller 24 generates an open command of a semiconductor switch 21 for separating a power capacitor 20 from a system. When the reactive power detected by the reactive power meter 22 is a predetermined delay-phase reactive power or more, a close command of the semiconductor switch 21 with voltage phase of an electric power receiving busbar for making a peak value of a rush current into the power capacitor 20 smaller than a prescribed value is generated so that the power capacitor 20 is connected to the system. <P>COPYRIGHT: (C)2008,JPO&INPIT |
