| 摘要 |
PROBLEM TO BE SOLVED: To provide an reactive power compensation system stabilizing the instant voltage fluctuation which continuously occurs even in a distribution line where plural loads in which instantaneous voltage fluctuation occur are connected. SOLUTION: This reactive power compensation system has a circuit 19 extracting an instant (several ten milliseconds) voltage fluctuation component from plural frequency bands contained in the detection value of system voltage, a circuit 15 multiplying a gain K1, a circuit 16 extracting an intermediate frequency voltage fluctuation component lower than instant voltage fluctuation, a circuit 17 multiplying a gain K2 (<K1) and a circuit 18 adding both extracted components. Reactive current commands corresponding to the extracted signals are issued and a reactive power compensation device 3 is operated. Voltage after instant voltage fluctuation ΔV is compensated with the high gain K1 is dropped in a short time, it is kept to a voltage level which is slightly less than the dead zone lower limit of a voltage adjuster 2 by the gain K2 and compensation sharing to the voltage adjuster 2, which is decided by the product of the operation time limit of the voltage adjuster 2 and the number of tap switching times, which compensates ΔV, is completed in almost minimum time. |
