Patent ID: 9671809
Date: 2017-06-06
CPC Classifications: G05F

Claim:
1. A reactive power compensation device, comprising: a reactive power output unit outputting reactive power to a power system; a voltage detection unit detecting a system voltage of said power system; and a control unit having first and second operation modes, wherein, in said first operation mode, said control unit controls a magnitude of the reactive power to be output by said reactive power output unit, based on the detected system voltage and one or more control parameters, and thereby adjusts the system voltage to be within a prescribed range or to be a prescribed value, and wherein, in said second operation mode, said control unit provides an output change period, changes the magnitude of the reactive power to be output by said reactive power output unit to said power system in said output change period, calculates, for adjusting said one or more control parameters, a plurality of system impedances of said power system at a plurality of detection time points within said output change period, based on change amounts of the system voltage detected at said plurality of detection time points and corresponding change amounts of the reactive power, evaluates a variation between the calculated system impedances, and, based on the evaluated variation, determines whether to adjust said one or more control parameters based on the calculated system impedances.