Abstract: When a voltage of a system is stabilized by connecting the system with two types of voltage regulators, i.e., a slow-response tap-changing transformer and a quick-response reactive power regulator, it is not always clear how characteristics of the reactive power regulator should be regulated. Moreover, the regulation takes much time. In a range where voltage fluctuation of the system is small and a tap-changing transformer can cope with the change, gain of a reactive power regulator is set to be low, and its output is restrained. In a range where voltage fluctuation of the system is large and the voltage deviates from a width of a dead zone of the tap-changing transformer, gain of the reactive power regulator is set to be high, and regulating current is fully utilized.

Abstract: When a voltage of a system is stabilized by connecting the system with two types of voltage regulators, i.e., a slow-response tap-changing transformer and a quick-response reactive power regulator, it is not always clear how characteristics of the reactive power regulator should be regulated, and moreover, the regulation takes much time. In a range where voltage fluctuation of the system is small and a tap-changing transformer 17 can cope with the change, gain of a reactive power regulator 1 is set to be low, and its output is restrained. In a range where voltage fluctuation of the system is large and the voltage deviates from a width of a dead zone of the tap-changing transformer, gain of the reactive power regulator 1 is set to be high, and a regulating current is fully utilized.