This AC power regulator controls the supply of power to a load by means of phase control, and is provided with: a target voltage calculation unit 101 that calculates a target voltage, on the basis of a given target value and a rated voltage of a load power source 3; a measurement unit 107 that measures an output voltage; a target load factor correction value calculation unit 103 that calculates a target load factor on the basis of the ratio of the output voltage to the target voltage; and an output estimation unit 109 that calculates, on the basis of an output voltage value of the previous control cycle and the target load factor of the previous control cycle, an estimated output voltage of a previous control cycle at an ignition angle at which the output becomes largest, wherein the target load factor correction value calculation unit 103 calculates the target load factor of the present control cycle on the basis of the ratio of the estimated output voltage of the previous control cycle to the target voltage of the current control cycle. Thus, an AC power regulator that has high responsiveness and that can execute control so as to match the output voltage with the target voltage even when the power supply voltage fluctuates is provided.
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