VOLTAGE CONTROLLER

PROBLEM TO BE SOLVED: To provide a technique with which it becomes possible to estimate an adjustment target voltage with precision even when a user does not set a set point of a voltage controller.SOLUTION: A voltage controller 1 includes a transformer 16, a voltage/power measuring instrument 10, a measurement database 12 for storing measurement data, a regression analysis unit 13, and a control execution unit 15. The regression analysis unit 13 performs multiple regression analysis on the measurement data, thereby calculating set points k1(i) and k2(i) that are correlation coefficients between a voltage drop from an own end voltage Vs to a compensation point voltage V(i) and own end passage active power P as well as own end passage reactive power Q. When the compensation point voltage V(i) is not obtained, the control execution unit 15 obtains a compensation point voltage estimation value Vn(i) using the set points k1(i) and k2(i) and controls a voltage of the transformer 16 so that the estimation value falls within an operating range.