VOLTAGE REACTIVE POWER CONTROL DEVICE

PROBLEM TO BE SOLVED: To reduce abrupt fluctuations in voltage by predicting the fluctuations in voltage from time-of-day information and past history data associated with physical quantities required for voltage reactive power control, and correcting the voltage reference value. SOLUTION: This control device comprises a voltage reactive power controller 101, equipment 102 to be controlled, a voltage corrector 103 and a timer 104 for transferring the time-of-day information to the voltage corrector. The control device detects a value V(t) for the voltage of a transmission line and compares it with a reference voltage value V(t)*. When the difference between them is larger than the dead band width of a dead band width setting device, the control device calculates a reactive power required for control from the voltage difference to control the reactive power passed. The voltage corrector 103 acquires physical quantities typified by the value for the voltage of the bus, the time-of-day information from the timer 104, and the like, and inputs the quantity of load during exercise of control, the voltage value, time-of-day information, climatic conditions or the day of week to functional relation items to calculate an amount V(t)cor of a voltage reference value correction for each time of day. As a result, it is possible to reduce the abrupt fluctuations in a voltage due to cyclic abrupt variations in reactive power load.