VOLTAGE CONTROL SYSTEM

PROBLEM TO BE SOLVED: To provide a voltage control system capable of compensating both of long periodic fluctuation and short periodic fluctuation of voltage.SOLUTION: A voltage control system 10 includes: a tap switching transformer 2 disposed on a power distribution system; a TVR 3 which is disposed at the secondary side of the tap switching transformer 2 and is capable of responding at a speed faster than the tap switching transformer 2; and voltage detectors 4 and 5 each for detecting a voltage on the power distribution system. The voltage control system 10 switches the tap value of the tap switching transformer 2 according to a long periodic element of the voltage detected by the voltage detector 4; and switches the tap value of the TVR 3 according to a periodic element shorter than the long periodic element of the voltage. 【課題】電圧の長周期変動に加え、短周期変動に対する補償を可能とする電圧制御システムを提供する。【解決手段】電圧制御システム１０は、配電系統上に設置されたタップ切換式変圧装置２と、タップ切換式変圧装置２の二次側に設置され、タップ切換式変圧装置２よりも高速で応答可能なＴＶＲ３と、配電系統の電圧を検出する電圧検出器４、５と、を備え、電圧検出器４により検出された電圧の長周期成分に応じてタップ切換式変圧装置２のタップ値を切り換え、電圧の長周期成分よりも短周期の成分に応じてＴＶＲ３のタップ値を切り換える。【選択図】図１