Voltage Control Device And Voltage Control Method

Abstract: This voltage control device is provided with: an inverter that converts DC power output from a battery into AC power and supplies the AC power to a power system; and a control device that is connected to the inverter. The control device executes: a process of calculating a first virtual impedance by using various variables when a voltage drop of an output voltage of the inverter is equal to or greater than a threshold value due to a fluctuation in an AC voltage of the power system; a process of calculating a second virtual impedance to be temporarily added to the first virtual impedance so that an output current of the inverter is not greater than a rated value; a process of calculating a virtual effective voltage and a virtual reactive voltage by multiplying each of an effective current and a reactive current calculated by the output current of the inverter by a virtual impedance obtained by adding the first virtual impedance and the second virtual impedance; and a process of performing a voltage control so that the effective current and the reactive current respectively approach an effective current command value and a reactive current command value required for the power system on the basis of the virtual effective voltage and the virtual reactive voltage.

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